One of the bottlenecks limiting the cycling stability of high voltage lithium metal batteries(LMBs)is the lack of suitable electrolytes.Herein,phenyl vinyl sulfone(PVS)is proposed as a multifunctional additive to stab...One of the bottlenecks limiting the cycling stability of high voltage lithium metal batteries(LMBs)is the lack of suitable electrolytes.Herein,phenyl vinyl sulfone(PVS)is proposed as a multifunctional additive to stabilize both cathode and anode interfaces as it can be preferentially oxidized/reduced on the electrode surfaces.The PVS derived solid electrolyte interphase films can not only reduce the transition metal dissolution on the cathode side,but also suppress the Li dendrite spread on the lithium anode side.The Li||Li symmetric battery with PVS addition delivers longer cycle life and a higher critical current density of over 3.0 m Ah cm^(-2).The LiNi_(0.8)Co_(0.1)Mn0.1O_(2)(NCM811)||Li full cell exhibits excellent capacity retention of 80.8%or 80.0%after 400 cycles at 0.5 C or 1 C rate with the voltage range of 3.0–4.3 V.In particular,the NCM811||Li cell under constrained conditions remains operation over 150 cycles.This work offers new insights into the electrolyte formulations for the next generation of LMBs.展开更多
A mild, one-pot procedure for the synthesis of vinyl ethers in good yields from 2-hydroxyalkyl phenyl selenides with primary or secondary organic halides has been developed.
The crystal structure and mechanism of the title molecule are discribed. Thiscrystal is orthorhombic, belonging to space group PC21/B with α=1. 002 1 (2) nm, b=1. 483 0(3) nm, c=2. 173 6(4) nm, V=3. 230 39(2) nm3, Z=...The crystal structure and mechanism of the title molecule are discribed. Thiscrystal is orthorhombic, belonging to space group PC21/B with α=1. 002 1 (2) nm, b=1. 483 0(3) nm, c=2. 173 6(4) nm, V=3. 230 39(2) nm3, Z=2, Dc=1.80 g/cm3, R=0. 069 3. The structure was solved by direct method. The tin atom of the title compoundexists in two distorted-trigonal-bipyramidal geometry, defined by two carbon, one bromide,one chloride and one oxygen atoms leading to a five-membered chelate ring. In the structure,the five-membered ring containing the intermolecular O→Sn has a half chair conformation.展开更多
借助流变仪研究了苯基三苯乙炔基硅烷(PTPES)、乙烯基三苯乙炔基硅烷(VTPES)、二苯基二苯乙炔基硅烷(BPBPES)3种单体及其聚合物(TSAR)的流变性能,并利用热分析技术分析了共聚物的反应动力学,建立了热分解机理函数。流变分析表明,3种单...借助流变仪研究了苯基三苯乙炔基硅烷(PTPES)、乙烯基三苯乙炔基硅烷(VTPES)、二苯基二苯乙炔基硅烷(BPBPES)3种单体及其聚合物(TSAR)的流变性能,并利用热分析技术分析了共聚物的反应动力学,建立了热分解机理函数。流变分析表明,3种单体加工窗口超过150℃,具有良好的加工性能;热重分析显示,800℃时聚合物残炭率在70%左右;8种动力学分析证实,聚合物热分解反应级数n=4,反应活化能E=131.2 k J/mol。展开更多
基金financially supported by the National Key Research and Development Program of China(No.2019YFA0705603)Science Fund for Creative Research Groups of the National Natural Science Foundation of China(No.21921005)。
文摘One of the bottlenecks limiting the cycling stability of high voltage lithium metal batteries(LMBs)is the lack of suitable electrolytes.Herein,phenyl vinyl sulfone(PVS)is proposed as a multifunctional additive to stabilize both cathode and anode interfaces as it can be preferentially oxidized/reduced on the electrode surfaces.The PVS derived solid electrolyte interphase films can not only reduce the transition metal dissolution on the cathode side,but also suppress the Li dendrite spread on the lithium anode side.The Li||Li symmetric battery with PVS addition delivers longer cycle life and a higher critical current density of over 3.0 m Ah cm^(-2).The LiNi_(0.8)Co_(0.1)Mn0.1O_(2)(NCM811)||Li full cell exhibits excellent capacity retention of 80.8%or 80.0%after 400 cycles at 0.5 C or 1 C rate with the voltage range of 3.0–4.3 V.In particular,the NCM811||Li cell under constrained conditions remains operation over 150 cycles.This work offers new insights into the electrolyte formulations for the next generation of LMBs.
基金the Natural Science Foundation of Jiangxi Province(No.0420017)for financial support
文摘A mild, one-pot procedure for the synthesis of vinyl ethers in good yields from 2-hydroxyalkyl phenyl selenides with primary or secondary organic halides has been developed.
文摘The crystal structure and mechanism of the title molecule are discribed. Thiscrystal is orthorhombic, belonging to space group PC21/B with α=1. 002 1 (2) nm, b=1. 483 0(3) nm, c=2. 173 6(4) nm, V=3. 230 39(2) nm3, Z=2, Dc=1.80 g/cm3, R=0. 069 3. The structure was solved by direct method. The tin atom of the title compoundexists in two distorted-trigonal-bipyramidal geometry, defined by two carbon, one bromide,one chloride and one oxygen atoms leading to a five-membered chelate ring. In the structure,the five-membered ring containing the intermolecular O→Sn has a half chair conformation.
文摘借助流变仪研究了苯基三苯乙炔基硅烷(PTPES)、乙烯基三苯乙炔基硅烷(VTPES)、二苯基二苯乙炔基硅烷(BPBPES)3种单体及其聚合物(TSAR)的流变性能,并利用热分析技术分析了共聚物的反应动力学,建立了热分解机理函数。流变分析表明,3种单体加工窗口超过150℃,具有良好的加工性能;热重分析显示,800℃时聚合物残炭率在70%左右;8种动力学分析证实,聚合物热分解反应级数n=4,反应活化能E=131.2 k J/mol。
