Debye-screening effect on electron-impact excitation of helium-like Al^(11+)and Fe^(24+)ions

Debye-screening effects on the electron-impact excitation(EIE)processes for the dipole-allowed transition 1 s_(2)^(1)S→1 s2 p^(1)P in He-like Al^(11+)and Fe^(24+)ions are investigated using the fully relativistic distorted-wave methods with the Debye-Huckel(DH)model potential.Debye-screening effects on the continuum-bound(CB)interaction and target ion are discussed,both of which result in reduction of EIE cross sections.This reduction due to screening on the CB interaction is dominant.The non-spherical and spherical DH potentials are adopted for considering the screening effect on the CB interaction.It is found that the spherical DH potential could significantly overestimate the influence of plasma screening on EIE cross sections for multielectron He-like ions.

原发性痛风患者24 h尿液离子含量及其与肾结石的关系

目的 探讨原发性痛风患者24 h尿液离子含量及其与肾结石的关系。方法 研究方法为回顾性分析,观察对象为2021年1月至2023年1月广安市人民医院入院的200例原发性痛风患者。超声检查显示,200例原发性痛风患者中122存在肾结石(肾结石阳性组),78例无肾结石(肾结石阴性组);160例存在下肢关节尿酸盐晶体沉积;DECT确诊68例尿酸盐结石(DECT阳性组),132例无肾结石(DECT阴性组)。比较肾结石阳性组与肾结石阴性组,DECT阳性组与DECT阴性组的临床资料与超声影像资料,对尿液离子含量与肾结石之间的相关性及肾结石形成危险因素予以分析;同时,将双能CT(DECT)影像结果作为肾尿酸盐结石诊断金标准,分析尿液离子含量对痛风伴发肾尿酸盐结石的诊断价值。结果 肾结石阳性组的痛风病程为(83.91±30.53)个月,明显长于肾结石阴性组[(48.64±26.52)个月],24 h尿草酸总量为(28.54±20.63) mg/24 h,明显高于肾结石阴性组[(20.09±9.74) mg/24 h],24 h尿枸橼酸总量为(355.63±219.52)mg/24 h,明显低于肾结石阴性组[(506.24±315.32) mg/24 h],差异均有统计学意义(P<0.05)。DECT阳性组患者痛风病程为(108.23±72.14)个月,明显长于DECT阴性组[(49.05±28.31)个月],血尿酸、24 h尿草酸总量、24 h尿尿酸总量分别为(522.98±109.14)μmol/L、(28.47±10.71) mg/24 h、(1 684.11±811.08) mmol/24 h,均明显高于DECT阴性组[(479.36±103.32)μmol/L、(23.54±10.82) mg/24 h、(1 517.81±886.53) mmol/24 h],24 h尿枸橼酸总量为(391.63±261.14) mg/24 h,明显低于DECT无阴性组[(555.91±316.24) mg/24 h],差异均有统计学意义(P<0.05)。痛风伴发肾尿酸盐结石诊断中24 h尿尿酸总量的ROC曲线下面积为0.202,无预测价值;24 h尿枸橼酸总量的ROC曲线下面积为0.672(95%CI:0.558~0.782),最佳预测值为272.5 mg(敏感度为0.938,特异度为0.518);24 h尿草酸的ROC曲线下面积为0.621(95%CI:0.512~0.730),最佳预测值为13.2 mg(敏感度为0.98,特异度为0.73)。Logistic回归分析显示,原发性痛风患者超声检查发现肾结石危险因素主要有低24 h尿枸橼酸总量、高血尿酸及长痛风病程(P<0.05);原发性痛风患者肾尿酸盐结石危险因素主要有低24 h尿枸橼酸总量、高血肌酐及长痛风病程(P<0.05)。结论 原发性痛风患者伴发肾尿酸盐结石时具有24 h尿草酸总量高、24 h尿枸橼酸总量低的特点;24 h尿草酸总量、24 h尿枸橼酸总量对痛风伴发肾尿酸盐结石具有较好的诊断价值。低24 h尿枸橼酸总量、长痛风病程是原发性痛风患者发生肾结石的重要危险因素。

Researches on the Growth Habit and Optical Properties of Fe^(3+) Ion Doped KDP Crystal

During the process of KDP crystal growth, metal ions strongly affect the growth habit and optical properties of KDP single crystal. In this paper, KDP crystals were grown from an aqueous solution doped with different concentration of Fe^3＋ dopant by traditional temperaturereduction method and ＂point-seed＂ rapid growth method. Furthermore, we examined the light scatter and measured the transmission of these KDP crystals. It is found that the dopant of Fe^3＋ ion can improve the stability of the KDP growth solution when its concentration is less than 30 ppm. The effects of Fe^3＋ ion on the growth habit and optical properties of KDP crystal are also obvious.

STUDY OF SURFACE RESISTIVITY MODIFICATION IN Al_2O_3 CERAMIC IMPLANTED BY Fe^(2+)

The implanted ion range, the depth profile and the film sttucture of the implanted layer were studied; the carrier concentration and the mobility were measured; the conductivity mechanism of the film implanted Fe into Al_2O_3 ceramic was discussed. The conclusion is that the implanted Fe^(2+) ions move into Al_2O_3 lattice and replace Al^(3+) to form subs- titution impurities so that the ion implanted lat- tice, as compared with the original one, presents an effective negative charge which forms a negative charge center. A vacancy is bound arround it, and an acceptor is introduced in the forbidden band.

电感耦合等离子体质谱法测定土壤中24种元素

采用电感偶合等离子体质谱法同时测定环境土壤样品中锂、铍、硼、铝、镁、钛、铁、锰、砷、硒、锶、锑、钒、铬、铜、锌、镍、钼、钴、镉、银、铅、钡、铊等24种元素。试验采用动态反应池,考察了影响测定的因素,结果表明:引入动态反应气NH_3可有效消除多原子离子干扰。优化了NH_3的流速,确定了分析矾、铬、铜和砷等易受干扰元素的最佳流速分别为0.70,0.72,0.30,0.30 mL·min^(-1)。检出限(3σ)在0.005～0.1μg·L^(-1)之间,加标回收率在94.0%～104.5%之间。

人白细胞介素-24基因的克隆、表达和纯化

目的对人白细胞介素-24(hIL-24)进行克隆、表达和纯化。方法分离人外周血单个核细胞,ConA刺激培养,提取细胞总RNA,应用RT-PCR技术从外周血单个核细胞中扩增hIL-24成熟肽编码区,定向克隆至融合表达载体pGEX-4T-1,重组载体pGEX-4T-1/hIL-24经DNA测序鉴定后,转化E.coliBL21(DE3),IPTG诱导表达,阴离子交换层析纯化融合蛋白,SDS-PAGE和Westernblot鉴定。结果所得hIL-24基因经序列分析,与GenBank公布一致。所构建融合表达载体pGEX-4T-1/hIL-24测序正确,转化BL21(DE3)后,37℃诱导表达相对分子质量约为44000的融合蛋白,主要以包涵体形式存在,占菌体总蛋白的30.63%。经纯化后,纯度达85%以上。Westernblot检测能与兔抗人IL-24的多克隆抗血清发生结合反应。结论已成功构建了hIL-24的融合表达载体pGEX-4T-1/hIL-24,并在大肠杆菌中高效表达,纯化后获得了高纯度的融合蛋白,为hIL-24的功能及活性研究奠定基础。

Highly sensitive Fe^(3+)luminescence detection via single-ion adsorption

To achieve a lower detection limit has always been a goal of analytical chemists.Herein,we demonstrate the first picomolar level detection capability for Fe3+ion via luminescence detection technology.The results of structural analysis and theoretical calculation show that Fe3+ions are adsorbed on the central node of Eu-DBM(DBM=dibenzoylmethane)sensor in the form of single ion at ultralow concentration.Subsequently,the pathways of photo-induced charge and energy transfer of the obtained Eu-DBM@Fe^(3+)material have been changed,from the initial DBM-to-Eu^(3+)before Fe^(3+)adsorption to the ultimate DBM-to-Fe^(3+)after adsorption process,which quenches the luminescence of Eu3+ion.This work not only obtains the highly sensitive luminescence detection ability,but also innovatively proposes the single-ion adsorption mechanism,both of which have important scientific and application values for the development of more efficient detection agents in the future.

Co^(24+)离子1s^23s-1s^2np跃迁的波长和振子强度

用全实加关联方法计算了Co^(24+)离子1s^23s和1s^2np(n≤9)态的非相对论能量;在计算相对论效应和质量极化效应对体系能量的一级修正、估算高阶相对论修正和QED修正的基础上,计算了该离子1s^23s-1s^2np的跃迁能、波长和在三种规范下的振子强度,得到与现有实验数据符合得很好的结果.与量子亏损理论结合,将对该离子能量和振子强度的理论预言准确地外推到包括连续态的整个能域.

Effect of binary conductive additive mixtures on electrochemical performance of polyoxomolybdate as cathode material of lithium ion battery

Binary carbon mixtures, carbon black ECP 600JD(ECP) combined with vapor grown carbon fiber(VGCF) or carbon nanotube(CNT), or graphene(Gr) in different mass ratios, are investigated as the conductive additives for the cathode material polyoxomolybadate Na_3[AlMo_6O_(24)H_6](NAM). Field emission scanning electron microscopy and energy dispersive X-ray spectroscopy show that the surfaces of NAM particles are covered homogeneously with the binary conductive additive mixtures except the combination of ECP and CNT. The optimum combination is the mixture of ECP and VGCF, which shows higher discharge capacity than the combinations of ECP and CNT or Gr. Initial discharge capacities of 364, 339, and 291 m A·h/g are obtained by the combination of ECP and VGCF in the mass ratios of 2:1, 1:1, and 1:2, respectively. The results of electrochemical impedance spectra and 4-pin probe measurements demonstrate that the combination of ECP and VGCF exhibits the highest electrical conductivity for the electrode.

[Omim]_(6)Mo_(7)O_(24)碳糊离子选择性电极测定环境水体中的PF_(6)^(-)

采用自制的[Omim]_(6)Mo_(7)O_(24)碳糊离子选择性电极(ISE)测定水中PF6^(-)的含量。试验采用1-辛基-3-甲基咪唑四氟硼酸盐和钼酸铵制备[Omim]_(6)Mo_(7)O_(24)固态离子液体,并用傅里叶变换红外光谱仪(FT-IR)和X射线衍射仪(XRD)进行表征,结果表明:[Omim]_(6)Mo_(7)O_(24)固态离子液体已被成功制备;热重(TG)分析结果表明:该离子液体在28~280℃内的热稳定性较好。将制备的[Omim]_(6)Mo_(7)O_(24)固态离子液体粉末与石墨粉按照质量比为1:9的比例混合,再将该混合粉末与二甲基硅油按照质量比6:1的比例混合制备碳糊ISE。在30℃下,以碳糊ISE为指示电极,Ag/AgCl电极为参比电极,在体积比为1:1的工作缓冲溶液(由硼酸、柠檬酸和磷酸钠混合制备,pH 9)和Na2EDTA溶液的混合溶液中测定水中PF6^(-)的含量。结果显示:在PF6^(-)的浓度为1.0×10^(-8)~1.0×10^(-1)mol·L^(-1)时,其浓度的负对数与对应的碳糊ISE电位响应值呈线性关系,检出限为5.4×10-9 mol·L^(-1)。PF6^(-)的加标回收率大于95.0%,测定值的相对标准偏差(n=5)不大于2.5%。采用该方法和离子色谱法同时分析了3组PF6^(-)盲样,取得了较为一致的结果。用该方法分析环境水体时,由于PF6^(-)的易水解性,未检出PF6^(-)的残留,采用该方法考察了PF6^(-)在常规酸度范围(pH 6~8)水体中的水解过程,发现PF6^(-)的半衰期为0.426~0.444 h,且常规水体的酸度变化不会影响PF6^(-)的水解。

24小时尿标本生化检测中钙磷镁离子测定值的影响因素分析

目的探讨24 h尿标本生化检测中钙磷镁离子测定值的影响因素。方法选取2020年3—6月中国人民解放军总医院海南医院门诊或住院患者的61份24 h新鲜尿标本。每份标本分成4份,其中3份按照试剂盒推荐的检测pH值(钙离子3~4、磷离子<3、镁离子1)以盐酸分别酸化尿液,分别测定各份标本常温条件下即时(0 h)及放置24 h后钙磷镁离子的浓度,对各条件下测定值分别进行比较。结果常温即时检测中酸化后磷镁离子含量低于未酸化时[(11.16±0.86)mmol/24 h比(11.36±0.88)mmol/24 h、(1.82±0.14)mmol/24 h比(1.84±0.14)mmol/24 h],差异均有统计学意义(均P<0.05)。未酸化标本放置24 h后钙磷离子含量均低于常温即时[钙离子:(1.91±0.21)mmol/24 h比(2.08±0.22)mmol/24 h,放置24 h后磷离子:(11.15±0.88)mmol/24 h],差异均有统计学意义(均P<0.05)。酸化尿标本放置24 h后磷离子含量[(11.42±0.86)mmol/24 h]高于即时检测,差异有统计学意义(P<0.05)。放置24 h后,酸化尿标本钙离子[(2.14±0.22)mmol/24 h]、磷离子检测结果高于未酸化标本,差异均有统计学意义(均P<0.05)。结论在24 h尿标本的检测中,标本的pH值及放置时长对于钙磷镁离子的测定值存在不同影响。

N-doped carbon quantum dots as fluorescent probes for highly selective and sensitive detection of Fe^3+ ions

To investigate the effect of nitrogen on the photoluminescence properties of carbon quantum dots (CO Ds), N-doped carbon quantum dots (N-CQDs)were synthesized by one-step hydrothermal treatment using biomass tar as the carbon precursor.As an inevitable organic pollutant,the unsaturated bonds in biomass tar,such as carboxylic acids,aldehydes,and aromatics,are favorable for formation of the graphitic carbon lattice.The obtained N-CQDs are spherical with an average particle size of 2.64nm and the crystal lattice spacing is 0.25nm,corresponding to the (100)facet of graphitic carbon.The N-CQDs emit bright blue photoluminescence under 365nm ultraviolet light,and they have excellent water solubility and stability with a high quantum yield of 26.1%.Coordination between the functional groups on the N-CQD surface and Fe^3+ ions is promoted because of the improved electronic properties and surface chemical reactivity caused by N atoms,leading to a significant fluorescence quenching effect of the N-CQDs in the presence of Fe^3+ions with high selectivity and sensitivity.There is a linear relationship between In (Fo/F)and the Fe^3+ concentration in the N-CQD concentration range 0.06-1400μmol/L with a detection limit of 60nmol/L, showing that the N-CQ.Ds have great potential as a fluorescent probe for Fe^3+detection.

Electrochemical synthesis of Ni doped carbon quantum dots for simultaneous fluorometric determination of Fe^(3+)and Cu^(2+)ion facilely

A novel Ni doped carbon quantum dots(Ni-CQDs)fluorescence probe was synthesized by facile electrolysis of monoatomic Ni dispersed porous carbon(Ni–N–C).The obtained Ni-CQDs showed a high quantum yield of 6.3%with the strongest excitation and emission peaks of 360 nm and 460 nm,and maintained over 90%of the maximum fluorescence intensity in a wide p H range of 3–12.The metal ions detectability of Ni-CQDs was enhanced by Ni doping and functional groups modification,and the rapid and selective detection of Fe^(3+)and Cu^(2+)ions was achieved with Ni-CQDs through dynamic and static quenching mechanism,respectively.On one hand,the energy band gap of Ni-CQDs was regulated by Ni doping,so that excited electrons in Ni-CQDs were able to transfer to Fe^(3+)easily.On the other hand,the abundant functional groups promoted the generation of static quenching complexation between Cu^(2+)and Ni-CQDs.In metal ions detection,the linear quantitation range of Fe^(3+)and Cu^(2+)were 100–1000μM(R^(2)=0.9955)and 300–900μM(R^(2)=0.9978),respectively.The limits of detection(LOD)were calculated as 10.17 and 7.88μM,respectively.Moreover,the fluorescence quenched by Cu^(2+)could be recovered by EDTA2-due to the destruction of the static quenching complexation.In this way,NiCQDs showed the ability to identify the two metal ions to a certain degree under the condition of Fe^(3+)and Cu^(2+)coexistent.This work paves the way of facile multiple metal ion detection with high sensitivity.

One-step hydrothermal synthesis of Cit-NaYbF_(4):Er^(3+)nanocrystals with enhanced red upconversion emission for in vivo fluorescence molecular tomography

Fluorescence imaging techniques represent essential tools in in vitro,preclinical,and clinical studies.In this study,an improved one-step hydrothermal method to synthesize citric acid(CA)modifiedα-NaYbF_(4):2%Er^(3+)nanocrystals was proposed.The introduction of various doping ions into NaYbF_(4):2%Er^(3+)and the different valence states of the same ions affect both the crystal size and upconversion luminesce nce.There fore,we investigated the upconversion luminesce nce enha ncement of NaYbF_(4):2%Er^(3+)by ion doping and find that the upconversion luminescence intensity of the upconversion nanoparticles(UCNPs)co-doped with 5 mol%Fe^(2+)ions shows the greatest enhancement,especially for red emission at654 nm.Furthermore,HeLa cells incubated with UCNPs allow for imaging with strong red upconversion emission detectio n.Confocal laser scanning microscope(CLSM)fluorescent images of HeLa cells indicate that NaYbF_(4):2%Er/5%Fe^(2+)leads to a clear outline and improves visualization of the cell morphology.In addition,the CA coated NaYbF_(4):2%Er^(3+)/5%Fe^(2+)nanoparticles and NaYbF_(4):2%Er^(3+)/5%Fe^(2+)show low cytotoxicity in HeLa cells.Organ imaging reveals the efficiency of these UCNPs to analyze the lungs,liver,and spleen.Together,these results indicate that the Cit-NaYbF_(4):2%Er^(3+)/5%Fe^(2+)UCNPs are efficient nanoprobes for fluorescence molecular to mography.

油菜素内酯对盐渍下油菜幼苗生长的调控效应及其生理机制

为了探讨油菜素内酯对植物耐盐性的调控,以甘蓝型油菜"南盐油1号"为试验材料,研究了外源24-表油菜素内酯(24-EBL)对100、200 mmol/L Na Cl胁迫下油菜幼苗干重(DW)、相对含水量(RWC)、渗透调节能力(OAA)、叶片气体交换参数、气孔限制值(Ls)等的调节效应,还测定了不同器官的Na+、K+、Cl-含量,并计算各器官的K+/Na+和SK,Na。结果表明:(1)在不同浓度的盐胁迫下,油菜幼苗DW显著下降,胁迫下外源喷施10-12、10-10、10-8、10-6mol/L 24-EBL作用下,油菜植株干重均不同程度的上升,且植株干重都在10-10mol/L 24-EBL(EBL2)处理下达到最大值,分别比100、200 mmol/L Na Cl胁迫下增加29%和20%。与对照相比,非盐胁迫下外源喷施10-12、10-10、10-8、10-6mol/L 24-EBL,油菜幼苗植株干重与对照相比均无显著变化。(2)不同Na Cl浓度胁迫下,油菜叶片的RWC显著下降,外施EBL2可显著提高油菜叶片的RWC和OAA。(3)不同浓度Na Cl胁迫下,油菜幼苗叶片净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)和蒸腾速率(Tr)均不同程度下降,而Ls显著上升,而外喷EBL2可不同程度的提高Pn、Gs、Ci、Tr,降低Ls。(4)与对照相比,Na Cl胁迫下油菜幼苗叶片、叶柄和根的Na+和Cl-含量均显著上升,Na Cl浓度愈高,Na+和Cl-含量上升愈显著。而K+含量均下降,外源EBL2可显著降低幼苗各器官的Na+和Cl-含量,对幼苗叶片K+含量没有影响,但提高了叶柄和根中的K+含量。上述表明,合适浓度的24-EBL外喷可明显提高油菜的耐盐水平,且不同浓度Na Cl胁迫下,最适24-EBL浓度均为10-10mol/L。主要是因为外源喷施24-EBL能显著改善离子稳态和渗透调节能力,从而改善盐胁迫下油菜幼苗的光合作用、水分状况,提高其耐盐性。而24-EBL对盐处理下油菜植株气孔限制的显著改善是其促进其光合、水分利用的重要原因,也是其对100 mmol/L Na Cl处理的油菜生长调控效果优于200 mmol/L Na Cl处理的重要原因之一。结果还显示,在叶片中,24-EBL外施可通过排Na+和Cl-来维持植株离子稳态,而对K+影响不大;在根、茎中可通过排Na+、排Cl-、吸K+维持稳态。

枯草芽孢杆菌和丙环唑对采后苹果炭疽病的防治效果

研究了离子束诱变的枯草芽孢杆菌B-24和丙环唑等对苹果采后炭疽病的防治效果及其几种防御酶活性的影响。结果表明:丙环唑对苹果炭疽病菌丝有明显的抑制效果,抑制浓度EC50为0.067μg/mL。代森锰锌的抑制作用最弱,其EC50为1806.984μg/mL。不同化学药剂和不同浓度的药剂之间,对苹果炭疽病的保护防效有显著差异。丙环唑对苹果炭疽病的防效最好,对寄主酶活的诱导作用也最强,能诱导苹果果实POD和PPO活性显著升高。代森锰锌防效差,POD活性和对照接近。同一药剂,浓度高的防效好,果实中酶活性也高。枯草芽孢杆菌在离体条件下活菌液对苹果炭疽病菌的抑制效果最好,抑制率为100%,表现出明显的拮抗作用。活体试验表明枯草芽孢杆菌能明显减轻苹果果实炭疽病的发生,接种枯草芽孢杆菌能诱导苹果果实POD和PPO活性的升高。

分光光度法测定微量铂(Ⅳ)的高灵敏显色反应及其应用研究

研究了２－（３，５－二氯－２－吡啶偶氮）－５－二甲氨基苯胺（３，５－ｄｉＣｌ－ＰＡＤＭＡ）光度法测定铂（Ⅳ）的最佳条件．结果表明，在ｐＨ３．２５～５．２５的ＨＡｃ－ＮａＡｃ缓冲介质中，铂与试剂在沸水浴中加热２５ｍｉｎ后能形成稳定的蓝色配合物，加入无机酸及乙醇后转变为绿蓝色，其最大吸收波长位于６３４ｎｍ，表观摩尔吸光系数高达１．０４×１０５Ｌ·ｍｏｌ－１·ｃｍ－１．以ＥＤＴＡ为掩蔽剂，较大量的常见金属离子不干扰测定．铂含量在０～１２μｇ／１０ｍＬ范围内符合比尔定律．方法已应用于催化剂中微量铂（Ⅳ）的测定．

氧化铝柱层状镧钛酸盐的制备

本文采用分步交换法首次制得了一种新的层柱材料—氧化铝柱层状镧钛酸盐．应用Ｘ射线衍射（ＸＲＤ）、红外光谱（ＩＲ）及透射电子显微镜（ＴＥＭ）等方法对该新材料进行了表征．结果表明，此材料具有较大的层间距（ｄ＝２．０５ｎｍ，６００℃）和较高的热稳定性（７００℃）．同时，考察了合成条件的改变对该材料性能的影响．

一种基于离子交换原理的PVC敏感膜的离子识别性能

目的研究应用于水质检测的、基于离子交换原理的PVC敏感膜离子传感器,评价含有中性离子载体二苯并24冠8的PVC敏感膜的离子识别性能。方法制备含有中性离子载体二苯并24冠8、质子载体ETH5294、脂溶性的阴离子添加剂四(4-氯苯)硼钾的PVC膜,即离子光极敏感膜,并应用可见光谱分析离子光极敏感膜对水中多种离子,如Pb2+、Zn2+、Cd2+、K+、Na+、Li+和Mg2+的识别特性。结果水溶液中的K+、Na+能与PVC敏感膜上的质子发生离子交换,而Li+和Mg2+不与敏感膜上的质子发生离子交换。结论制备的PVC敏感膜可选择识别K+、Na+,不能识别Li+和Mg2+,表明二苯并24冠8具有一定的离子识别能力。

共沉淀法制备LaF_3表面修饰LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2及性能研究

以LiNi1/3Co1/3Mn1/3O2为正极材料,采用共沉淀合成方法制备LaF3表面修饰LiNi1/3Co1/3Mn1/3O2正极材料,利用X射线衍射(XRD)、扫描电镜(SEM)和电化学测试等方法对合成材料的结构、形貌以及电化学性能进行表征。结果表明:经过LaF3表面修饰的LiNi1/3Co1/3Mn1/3O2材料保持了LiNi1/3Co1/3Mn1/3O2层状结构,其中LaF3表面修饰量为0.59%时,在电压为2.75～4.50V范围内,以0.3mA/cm2电流密度下经恒电流充放电测试,其首次放电比容量为172.7mAh/g,经过50周充放电循环后放电比容量为163.5mAh/g,表现出较高的初始放电比容量和良好的抗过充电性能。