Mechanism of high Li-ion conductivity in poly(vinylene carbonate)-poly(ethylene oxide)cross-linked network based electrolyte revealed by solid-state NMR

Solid polymer electrolytes(SPEs)have become increasingly important in advanced lithium-ion batteries(LIBs)due to their improved safety and mechanical properties compared to organic liquid electrolytes.Cross-linked polymers have the potential to further improve the mechanical property without trading off Li-ion conductivity.In this study,focusing on a recently developed cross-linked SPE,i.e.,the one based on poly(vinylene carbonate)-poly(ethylene oxide)cross-linked network(PVCN),we used solid-state nuclear magnetic resonance(NMR)techniques to investigate the fundamental interaction between the chain segments and Li ions,as well as the lithium-ion motion.By utilizing homonuclear/heteronuclear correlation,CP(cross-polarization)kinetics,and spin-lattice relaxation experiments,etc.,we revealed the structural characteristics and their relations to lithium-ion mobilities.It is found that the network formation prevents poly(ethylene oxide)chains from crystallization,which could create sufficient space for segmental tumbling and Li-ion co nductio n.As such,the mechanical property is greatly improved with even higher Li-ion mobilities compared to the poly(vinylene carbonate)or poly(ethylene oxide)based SPE analogues.

Residual alkali-evoked cross-linked polymer layer for anti-air-sensitivity LiNi_(0.89)Co_(0.06)Mn_(0.05)O_(2)cathode

High-energy density lithium-ion batteries(LIBs)with layered high-nickel oxide cathodes(LiNi_(x)Co_(y)Mn_(1-x-y)O_(2),x≥0.8)show great promise in consumer electronics and vehicular applications.However,LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)faces challenges related to capacity decay caused by residual alkalis owing to high sensitivity to air.To address this issue,we propose a hazardous substances upcycling method that fundamentally mitigates alkali content and concurrently induces the emergence of an anti-air-sensitive layer on the cathode surface.Through the neutralization of polyacrylic acid(PAA)with residual alkalis and then coupling it with 3-aminopropyl triethoxysilane(KH550),a stable and ion-conductive cross-linked polymer layer is in situ integrated into the LiNi_(0.89)Co_(0.06)Mn_(0.05)O_(2)(NCM)cathode.Our characterization and measurements demonstrate its effectiveness.The NCM material exhibits impressive cycling performance,retaining 88.4%of its capacity after 200 cycles at 5 C and achieving an extraordinary specific capacity of 170.0 mA h g^(-1) at 10 C.Importantly,this layer on the NCM efficiently suppresses unfavorable phase transitions,severe electrolyte degradation,and CO_(2)gas evolution,while maintaining commendable resistance to air exposure.This surface modification strategy shows widespread potential for creating air-stable LiNi_(x)Co_(y)Mn_(1-x-y)O_(2)cathodes,thereby advancing high-performance LIBs.

Tuning the cross-linked structure of basic poly(ionic liquid)to develop an efficient catalyst for the conversion of vinyl carbonate to dimethyl carbonate

Dimethyl carbonate(DMC)is a crucial chemical raw material widely used in organic synthesis,lithiumion battery electrolytes,and various other fields.The current primary industrial process employs a conventional sodium methoxide basic catalyst to produce DMC through the transesterification reaction between vinyl carbonate and methanol.However,the utilization of this catalyst presents several challenges during the process,including equipment corrosion,the generation of solid waste,susceptibility to deactivation,and complexities in separation and recovery.To address these limitations,a series of alkaline poly(ionic liquid)s,i.e.[DVBPIL][PHO],[DVCPIL][PHO],and[TBVPIL][PHO],with different crosslinking degrees and structures,were synthesized through the construction of cross-linked polymeric monomers and functionalization.These poly(ionic liquid)s exhibit cross-linked structures and controllable cationic and anionic characteristics.Research was conducted to investigate the effect of the cross-linking degree and structure on the catalytic performance of transesterification in synthesizing DMC.It was discovered that the appropriate cross-linking degree and structure of the[DVCPIL][PHO]catalyst resulted in a DMC yield of up to 80.6%.Furthermore,this catalyst material exhibited good stability,maintaining its catalytic activity after repeated use five times without significant changes.The results of this study demonstrate the potential for using alkaline poly(ionic liquid)s as a highly efficient and sustainable alternative to traditional catalysts for the transesterification synthesis of DMC.

Early changes in corneal densitometry after FS-LASIK combined with accelerated corneal cross-linking for correction of high myopia

AIM:To observe the effects of femtosecond laserassisted excimer laser in situ keratomileusis combined with accelerated corneal cross-linking(FS-LASIK Xtra)on corneal densitometry after correcting for high myopia.METHODS:In this prospectively study,130 patients underwent FS-LASIK or FS-LASIK Xtra for high myopia.Their right eyes were selected for inclusion in the study,of which 65 cases of 65 eyes in the FS-LASIK group,65 patients with 65 eyes in the FS-LASIK Xtra group.Patients were evaluated for corneal densitometry at 1,3,and 6mo postoperatively using Pentacam Scheimpflug imaging.RESULTS:Preoperative differences in corneal densitometry between the FS-LASIK and FS-LASIK Xtra groups in different ranges were not statistically significant(P>0.05).Layer-by-layer analysis revealed statistically significant differences in the anterior(120μm),central,and total layer corneal densitometry between the FS-LASIK and FS-LASIK Xtra groups at 1 and 3mo postoperatively(all P<0.05),the FS-LASIK Xtra group is higher than that of the FS-LASIK group.Analysis of different diameter ranges showed statistically significant differences between the FS-LASIK group and the FS-LASIK Xtra group at 1mo postoperatively in the ranges of 0–2,2–6,and 6–10 mm(both P<0.05);At 3mo postoperatively,the FS-LASIK Xtra group is higher than that of the FS-LASIK group in the ranges of 0–2 and 2–6 mm(P<0.05).At 6mo postoperatively,there were no statistically significant differences in corneal densitometry between the FS-LASIK group and the FS-LASIK Xtra group in different diameter ranges(all P>0.05).CONCLUSION:There is an increase in internal corneal densitometry during the early postoperative period after FS-LASIK Xtra for correction of high myopia.However,the densitometry values decreased to the level of conventional FS-LASIK at 6mo after surgery,with the most significant changes observed in the superficial central zone.

Construction of all-organic low dielectric polyimide hybrids via synergistic effect between covalent organic framework and cross-linking structure

Polyimide(PI)is a promising electronic packaging material,but it remains challenging to obtain an all-organic PI hybrid film with decreased dielectric constant and loss without modifying the monomer.Herein,a series of allorganic PI hybrid films were successfully prepared by introducing the covalent organic framework(COF),which could induce the formation of the cross-linking structure in the PI matrix.Due to the synergistic effects of the COF fillers and the cross-linking structure,the PI/COF hybrid film containing 2 wt%COF exhibited the lowest dielectric constant of 2.72 and the lowest dielectric loss(tanδ)of 0.0077 at 1 MHz.It is attributed to the intrinsic low dielectric constant of COF and a large number of mesopores within the PI.Besides,the cross-linking network of PI prevents the molecular chains from stacking and improves the fraction of free volume(FFV).The molecular dynamics simulation results are well consistent with the dielectric properties data.Furthermore,the PI/COF hybrid film with 5 wt%COF showed a significant enhancement in breakdown strength,which increased to 412.8 kV/mm as compared with pure PI.In addition,the PI/COF hybrid film achieve to reduce the dielectric constant and thermal expansion coefficient(CTE).It also exhibited excellent thermal,hydrophobicity,and mechanical performance.The all-organic PI/COF hybrid films have great commercial potential as next-generation electronic packaging materials.

In situ formed cross-linked polymer networks as dual-functional layers for high-stable lithium metal batteries

Lithium-metal anodes(LMAs)have been recognized as the ultimate anodes for next-generation batteries with high energy density,but stringent assembly-environment conditions derived from the poor moisture stability dramatically hinder the transformation of LMAs from laboratory to industry.Herein,an in situ formed cross-linked polymer layer on LMAs is designed and constructed by a facile thiol-acrylate click chemistry reaction between poly(ethylene glycol)diacrylate(PEGDA)and the crosslinker containing multi thiol groups under UV irradiation.Owing to the hydrophobic nature of the layer,the treated LMAs demonstrate remarkable humid stability for more than 3 h in ambient air(70%relative humidity).The coating humid-resistant protective layer also possesses a dual-functional characterization as solid polymer electrolytes by introducing lithium bis(trifluoromethanesulfonyl)imide in the system in advance.The intimate contact between the polymer layer and LMAs reduces interfacial resistance in the assembled Li/LiFePO_(4)or Li/LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)full cell effectively,and endows the cell with an outstanding cycle performance.

Cross-linked polyelectrolyte reinforced SnO_(2)electron transport layer for robust flexible perovskite solar cells

SnO_(2)electron transport layer(ETL)is a vital component in perovskite solar cells(PSCs),due to its excellent photoelectric properties and facile fabrication process.In this study,we synthesized a water-soluble and adhesive polyelectrolyte with ethanolamine(EA)and poly-acrylic acid(PAA).The linear PAA was crosslinked by EA,forming a 3D network that stabilized the SnO_(2)nanoparticle dispersion.An organic–inorganic hybrid ETL is developed by introducing the cross-linked PAA-EA into SnO_(2)ETL,which prevents nano particle agglomeration and facilitates uniform SnO_(2)film formation with fewer defects.Additionally,the PAA-EA-modified SnO_(2)facilitated a uniform and compact perovskite film,enhancing the interface contact and carrier transport.Consequently,the PAA-EA-modified PSCs exhibited excellent PCE of 24.34%and 22.88%with high reproducibility for areas of 0.045 and 1.00 cm~2,respectively.Notably,owing to structure reinforce effect of PAA-EA in SnO_(2)ETL,flexible device demonstrated an impressive PCE of 23.34%while maintaining 90.1%of the initial PCE after 10,000 bending cycles with a bending radius of 5 mm.This successful approach of polyelectrolyte reinforced hybrid organic–inorganic ETL displays great potential for flexible,large-area PSCs application.

A UV cross-linked gel polymer electrolyte enabling high-rate and high voltage window for quasi-solid-state supercapacitors

Serving as a promising alternative to liquid electrolyte in the application of portable and wearable devices,gel polymer electrolytes(GPEs)are expected to obtain more preferable properties rather than just be satisfied with the merits of high safety and deformability.Here,an easy-operated method is employed to fabricate cross-linked composite polymer membranes used for GPEs assisted by UV irradiation,in which N-doped carbon quantum dots(N-CQDs)and TiO2are introduced as photocatalysts and additives to improve the performances of GPEs.Specifically,N-CQDs participate as a cross-linker to construct the inner porous structure,and TiO2nanoparticles serve as a stabilizer to improve the electrochemical stability of GPEs under high voltage(3.5 V).The excellent thermal and mechanical stability of the membrane fabricated in this work guarantee the safety of the supercapacitors(SCs).This GPE based SC not only exhibits prominent rate performance(105%capacitance retention at the current density of 40A g^(-1))and cyclic stability(85%at 1 A g^(-1)under 3.5 V after 20,000 cycles),but also displays remarkable energy density(42.88 Wh kg^(-1))with high power density(19.3 k W kg^(-1)).Moreover,the superior rate and cycling performances of the as-prepared GPE based flexible SCs under flat and bending state confirm the feasibility of its application in flexible energy storage devices.

Cross-Linking of Sago Starch with Furan and Bismaleimide via the Diels-Alder Reaction

This research paper describes the synthesis of thermo-reversible cross-linking of sago starch by grafting a furan pendant group(methyl 2-furoate)onto the starch backbone,followed by a Diels-Alder(DA)reaction of the furan functional group with 1,1′-(methylenedi-4,1-phenylene)bismaleimide(BM).The proof of principles was provided by FTIR and 1H-NMR analyses.The relevant FTIR peaks are the carbonyl peak(υC=O sym)at 1721 cm^(−1);the two peaks appeared after DA cross-linking,i.e.,at 1510 cm^(−1)(corresponding toυCH=CH BM aromatic rings,stretching vibrations),and at 1173 cm^(−1)(assigned to cycloadduct(C-O-C,δDA ring))while the^(1)H-NMR result shows evidence for the presence of a furan ring in the starch matrices(in the range ofδ6.3-7.5 ppm).The crosslinked starch product is indeed thermally reversible,as is evident from the appearance of exothermal(DA,temperature range of 50℃-70℃)and endothermal(retro DA,temperature range of 125℃-150℃)transitions in the DSC thermograms.This paper not only proves the thermal reversibility but also demonstrates that the final product properties(chemical,morphology,and thermal stability)can be tuned by varying the annealing temperature,BM intake,and reaction time.

A Self-Healing and Nonflammable Cross-Linked Network Polymer Electrolyte with the Combination of Hydrogen Bonds and Dynamic Disulfide Bonds for Lithium Metal Batteries

The self-healing solid polymer electrolytes(SHSPEs)can spontaneously eliminate mechanical damages or micro-cracks generated during the assembly or operation of lithium-ion batteries(LIBs),significantly improving cycling performance and extending service life of LIBs.Here,we report a novel cross-linked network SHSPE(PDDP)containing hydrogen bonds and dynamic disulfide bonds with excellent self-healing properties and nonflammability.The combination of hydrogen bonding between urea groups and the metathesis reaction of dynamic disulfide bonds endows PDDP with rapid self-healing capacity at 28°C without external stimulation.Furthermore,the addition of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide(EMIMTFSI)improves the ionic conductivity(1.13×10^(−4)S cm^(−1)at 28°C)and non-flammability of PDDP.The assembled Li/PDDP/LiFePO_(4)cell exhibits excellent cycling performance with a discharge capacity of 137 mA h g^(−1)after 300 cycles at 0.2 C.More importantly,the self-healed PDDP can recover almost the same ionic conductivity and cycling performance as the original PDDP.

Self-Cross-Linked Tannin-Aminated Tannin Surface Coatings for Particleboard

Aminated tannins were prepared by reacting mimosa condensed tannin extract with ammonia yielding the substitution of many,if not all of the tannin hydroxyl groups with–NH_(2)groups.A tannin-aminated tannin(ATT)particleboard coating was then prepared by reacting raw tannin extract with aminated tannin extract and thus cross-linking the two by substituting tannin’s hydroxyl groups with the–NH_(2)groups on the aminated tannin to form–NH-bridges between the two.The resulting particleboard coating gave encouraging results when pressed at 180℃for 3 min.Conversely,the system in which tannin was reacted/cross-liked with urea(ATU)by a similar amination reaction did not perform as well as the ATT system,and this even when a higher curing temperature and longer hot press time were used.In particular its water repellence was worse probably due to the presence of urea and such a system with lower reactivity.Nonetheless,substituting the tannin–OHs with the urea–NH_(2)groups appeared to also take place.ATT gave better results than ATU as regards water repellence and mechanical resistance as shown by the cross cut test.The ATT system was shown to be between 95%and 98%biosourced.The difference appeared to be due,by TMA analysis,to the much faster formation of the ATT hardened network leading to a better cross-linked polymer coating.The chemical species formed for both the ATT and ATU system were studied by MALDI ToF and CP MAS^(13)C NMR.

极性分子的结构异同性对接枝改性交联聚乙烯材料直流电性能的影响

为改善高压直流电缆运行过程中绝缘层材料的电导率对温度与电场强度敏感性所导致的电场反转问题,以及直流高压长时间作用下的空间电荷积聚现象,该文采用极性基团接枝改性的方式提升交联聚乙烯(XLPE)材料的直流电性能。由于接枝单体一般为沸点较低的极性小分子化合物,为避免材料在接枝过程中单体的气化损失,首先通过平行双螺杆挤出机配合低温高压计量泵装置实现熔融接枝反应。将丙烯酸酯类小分子化合物(丙烯酸甲酯(MA)、丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA))分别预先接枝到低密度聚乙烯(LDPE)大分子链上制备接枝材料,通过红外光谱测试分析得出接枝单体皆成功接枝到LDPE大分子链上,熔融指数与凝胶含量测定表明材料的流变性能并未发生显著改变,X射线衍射测试与扫描电子显微镜观测发现接枝改性材料的结晶特性保持与基础树脂相似。进一步对三种接枝母料按一定比例稀释并完成交联过程,通过变温直流电导测试发现三种接枝改性材料的电导率-温度敏感性均出现不同程度的下降,综合高温空间电荷测试可以得出,接枝MA的XLPE材料电导率-温度敏感性下降幅度最大、空间电荷分布特性优异;结合第一性原理仿真计算可以进一步得到,三种接枝单体改性XLPE模型的陷阱能级较为一致,其直流电性能的改善效果与接枝单体的静电势分布存在显著关联。

高重复频率猝发多脉冲加载下交联聚苯乙烯真空沿面闪络特性

基于高重复频率强流多脉冲加速器的应用需求,针对交联聚苯乙烯(XLPS)材料在猝发多脉冲下的真空沿面闪络特性开展了实验研究。采用放置于平板电极中的XLPS圆台样品,在脉宽120 ns的单个脉冲和间隔500 ns的三脉冲加载下开展了真空沿面闪络实验,通过对实验平台和实验规范的优化设计,有效提升了实验效率和数据有效性,观测到了样品发生真空沿面闪络前的试样电压顶降现象和前序脉冲闪络对后续脉冲的显著影响,获得了XLPS材料在相应条件下真空沿面闪络的统计数据。在实验基础上,对XLPS材料在高重复频率多脉冲加载下的真空沿面闪络特性进行了分析,为高重复频率多脉冲加速器的绝缘设计提供了实验依据。

煤沥青交联改性处理对碳结构的影响

沥青基炭制品的碳结构高度依赖前驱体沥青的性质。采用化学交联的方法对沥青进行改性处理时,尽管化学交联的反应机理为亲电取代反应,但交联剂、催化剂的种类不同,沥青改性程度存在差异,进而影响炭制品结构。以中低温煤沥青为原料,探索3种交联剂(对苯二甲醇(PXG)、苯甲醛(BA)、对苯二甲酰氯(TPC))、5种催化剂(对甲苯磺酸、浓硫酸、浓硝酸、浓盐酸、硼酸)对沥青交联改性后炭制品结构的影响。通过TG-DTG、FT-IR研究交联改性后沥青热稳定性及沥青官能团的变化;借助XRD、Raman表征改性后沥青炭制品的微观结构差异。结果表明:交联剂和催化剂的存在促进了沥青分子的交联,有效阻止了热转化过程中轻组分挥发,提高了沥青的结焦值、软化点、热稳定等指标。以PXG为交联剂,沥青支链上亚甲基CH_(2)的H不易被取代;而以硼酸为催化剂时,支链末端甲基上的H易被取代;以BA为交联剂,取代氢的位置明显发生在芳香环上;以TPC为交联剂、浓硫酸为催化剂时,交联产品的C=0官能团含量增加,说明在这种组合下,TPC参加反应较多。无论与哪种交联剂相结合,浓盐酸为催化剂时,交联反应更易促进苯环上和支链上的C—H键发生取代反应。经过交联改性后的沥青,炭化过程中分子间较强的π-π相互作用减弱,有效阻止碳有序结构的形成,碳无序结构含量I_(D)/I_(G)增大。同时碳微晶层间距d_(002)明显增加,有序堆积平均堆积高度L_(c)减小,芳香层数降低,说明化学交联不仅影响有序碳结构排列,还可抑制碳微晶结构发育。其中硼酸作为催化剂时,催化效果更理想。获得的炭制品d_(002)在同组产品中最大。PXG、硼酸组合与沥青发生交联时,所得碳材料的d_(002)达0.377 nm。本研究为进一步定向调控和构筑沥青基碳材料奠定基础。

面向高温储能应用可交联聚丙烯电介质材料研究

近几年,电磁弹射技术和电动汽车行业快速发展,对于提高薄膜介电电容器的耐高温和高储能性能的需求也越来越迫切。为此,对接枝交联抗氧化剂的聚丙烯(PPHP)进行了热处理,使其内部发生交联形成交联三维网络,可提高聚丙烯的耐高温性能、耐高压性能、介电性能以及储能性能。研究结果表明:经过热处理的接枝可交联抗氧化剂聚丙烯(CPP)相较于双向拉伸聚丙烯(BOPP)和聚丙烯(PP),在室温下其击穿场强可以达到1105 MV/m,在130℃时可达到647 MV/m,介电常数在3.0左右,介电损耗在0.01以下;在600 MV/m的电场强度下,其能量密度值为9.13 J/cm^(3),能量释放效率达到94.3%。

可自修复海藻酸基离子凝胶的制备及性能

为了解决传统人工合成高分子基离子凝胶难降解、成本高、环境污染等问题,本文以天然高分子—海藻酸为聚合物基体,通过在离子液体中对其进行化学接枝改性和交联反应,设计并制备了一种具有自修复性能的化学交联型生物基离子凝胶。流变测试结果表明,该离子凝胶的模量随着海藻酸和交联剂含量的增加而升高,且在150℃的高温下离子凝胶依然可以保持凝胶结构。所制备的离子凝胶具有优异的压缩性能,压缩强度随着海藻酸含量的增加而增加,压缩强度可达1.02 MPa。电化学测试结果表明,离子凝胶具有良好的导电性能,其室温离子电导率都高于0.3 mS/cm。重要的是,离子凝胶在室温下无需任何辅助手段可在6 h完全自修复,表现出良好的自修复性。该研究为开发具有自修复性的高性能生物基离子凝胶提供了有效途径。

低频电压下XLPE电树枝生长及局部放电特性

低频电缆作为柔性低频交流输电系统中的关键设备,其绝缘介质在低频电压下的特性对电缆的设计和运行具有重要意义。为了研究低频电压下交联聚乙烯(XLPE)电树枝的生长及局部放电特性,设计并搭建了不同频率下电树枝生长实时观测和局部放电同步测量系统,探究了XLPE试样分别在20、30、40、50 Hz频率下电树枝的引发、生长及局部放电特性。结果表明:电压频率对XLPE电树枝生长及局部放电特性的影响有明显规律性。在20~50 Hz范围内,随着频率的降低,XLPE的起树电压略有升高,但电树枝生长速度加快,损伤面积增加,局部放电量和放电次数增大,放电相位分布基本不变。

血清P1NP、β-CTX水平联合骨髓细胞形态学检查对多发性骨髓瘤的诊断价值

目的 探讨骨髓细胞形态学检查联合血清Ⅰ型前胶原氨基端前肽(P1NP)、Ⅰ型胶原羧基端肽β特殊序列(β-CTX)检测对多发性骨髓瘤(MM)及其分期的诊断价值。方法 选取2020年1月至2023年2月在该院就诊的104例MM患者作为研究对象,根据国际分期标准(ISS)分为Ⅰ期、Ⅱ期和Ⅲ期,分别为32例、36例和36例。同时选取同期因为缺铁性贫血、再生障碍性贫血、骨髓增生异常综合征等原因接受骨髓穿刺的40例作为对照组。对所有受试者进行骨髓细胞形态学检查,测定血清P1NP和β-CTX水平,并分析其与MM及其分期的关系。结果 MM组骨髓浆细胞比[(23.4±8.6)%]、血清P1NP[(120.5±35.6)ng/mL]和β-CTX水平[(820.4±210.3)pg/mL]均显著高于对照组[(3.2±1.4)%、(52.3±12.4)ng/mL、(320.6±80.2)pg/mL],差异均有统计学意义(P<0.05),且随着MM分期的升高而增高。以骨髓浆细胞比例≥10%、血清P1NP≥80 ng/mL和β-CTX≥500 pg/mL为诊断标准,对MM的灵敏度和特异度分别为92.3%和95.0%,联合检测的灵敏度和特异度分别为98.1%和100.0%。以血清P1NP≥100 ng/mL和β-CTX≥700 pg/mL为分期标准,对MMⅢ期的灵敏度和特异度分别为86.1%和88.2%,联合检测的灵敏度和特异度分别为94.4%和97.1%。结论 骨髓细胞形态学检查联合血清P1NP、β-CTX检测对MM及其分期具有较高的诊断价值,有助于评估MM患者的病情和预后。

锂硫电池中CNTs-CNFs夹层对多硫化物的捕获和加速转化机理

为有效抑制多硫化锂(LiPSs)的穿梭效应,通过静电纺丝、电化学沉积和化学气相生长技术在碳纳米纤维(CNFs)上垂直生长碳纳米管(CNTs),开发了一种超薄、轻质的多功能三维多层交联碳纳米纤维-碳纳米管(CNTs-CNFs)夹层,并研究CNTs-CNFs对锂硫电池(LSBs)电化学性能的影响。研究结果表明:CNTs-CNFs薄膜优异的导电性和丰富的孔隙结构为LSBs提供了均匀的导电网络和LiPSs的吸附过滤屏障,与无夹层相比,含有CNTs-CNFs夹层的电池具有更优异的容量保持率和循环稳定性,在0.2 C电流密度下具有1296.7 mA·h/g的初始放电比容量,在100次循环后仍能提供了864.7 mA·h/g的放电比容量,容量保持率为66.68%。

不同入路法联合小针刀术在胸腰椎创伤性骨折微创椎弓根钉内固定术中的临床疗效研究

目的:分析不同入路法联合小针刀术在胸腰椎创伤性骨折微创椎弓根钉内固定术中的临床疗效,以及对血清骨特异性碱性磷酸酶(BALP)、Ⅰ型胶原羧基肽β特殊序列(β-CTX)水平的影响。方法:选取我院2020年1月-2022年6月收治的120例行微创椎弓根钉内固定术联合小针刀术干预治疗的胸腰椎创伤性骨折患者,随机分为三组。A组(40例)选择经皮入路,B组(40例)选择经Wiltse入路,C组(40例)选择经后正中入路。记录并比较三组伤椎有效性指标:Oswestry功能障碍指数(ODI)、后凸Cobb角和前缘高度比;视觉模拟疼痛(VAS)评分、血清BALP、β-CTX水平和围手术期指标(手术时间、术中出血量和术后引流量)。结果:三组患者术后7 d、30 d的伤椎ODI、后凸Cobb角和前缘高度比均优于术前,差异有统计学意义(P <0.05),但三组间伤椎ODI、后凸Cobb角和前缘高度比差异无统计意义(P>0.05);三组患者术后VAS评分均显著下降,差异有统计学意义(P <0.05),且三组术后1 d、7 d的VAS评分比较差异有统计意义(P <0.05);三组患者术后血清BALP水平均明显上升,血清β-CTX水平均明显下降,差异均有统计学意义(P <0.05),且三组术后7 d的血清BALP及β-CTX水平比较差异有统计意义(P <0.05);三组手术时间、术中出血量和术后引流量关系为A组<B组<C组,差异有统计学意义(P <0.05)。结论:经皮入路和经Wiltse入路微创椎弓根钉内固定术联合小针刀术干预治疗能有效改善胸腰椎创伤性骨折患者伤椎有效性及骨代谢水平,而传统后正中入路的有效性及对骨代谢水平的改善作用相对较差,临床可结合患者情况在经皮入路和经Wiltse入路二者之间酌情选择入路方式,并结合小针刀术进行干预治疗。