Efficient Ion Migration and Stable Interface Chemistry of PVDF-Based Electrolytes for Solid-State Lithium Metal Batteries

被引：0

作者：

Fan, Kaibo ^{[1
]}

Wang, Biao ^{[1
]}

Chen, Jie ^{[1
]}

Cao, Kai ^{[1
]}

Huang, Haozhong ^{[1
]}

Zhu, Zhongheng ^{[1
]}

Zhang, Qichen ^{[1
]}

Fu, Xiaowu ^{[1
]}

Sun, Ling ^{[2
,3
]}

Yuan, Jiren ^{[1
]}

Zhao, Yong ^{[1
]}

Hu, Zhengguang ^{[1
]}

Wang, Li ^{[1
]}

机构：

[1] Nanchang Univ, Sch Phys & Mat Sci, Jiangxi Prov Key Lab Photodetectors, Nanchang 330031, Peoples R China

[2] Chongqing Mat Res Inst Co Ltd, Chongqing 400707, Peoples R China

[3] Natl Engn Res Ctr Instrument Funct Mat, Chongqing 400707, Peoples R China

来源：

SMALL | 2025年

关键词：

bond dipole moments; interface failures; Li+-interaction environment; PVDF-based electrolytes; POLYMER ELECTROLYTES; COMPOSITE ELECTROLYTES; CONDUCTIVITY; SIO;

D O I：

10.1002/smll.202501124

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Poly(vinylidene fluoride) (PVDF)-based electrolytes with "Li salt-polymer-trace residual solvent" configuration have shown great potential in solid-state lithium metal batteries (SSLMBs). However, the interface failure initiated by the residual solvent and the sluggish Li+ migration kinetics caused by the intricacy of the Li+-interaction environment severely precludes the large-scale commercial application of PVDF-based electrolytes in SSLMBs. Herein, the PVDF-based electrolytes are fabricated by compositing the PVDF matrix and sand-ground silicon monoxide (SiO-a) fillers with silicon monoxide/silicon-suboxide/silicon-dioxide (Si/SiOx(0<x<2)/SiO2)heterostructure. Results show that SiO-a not only forcefully anchors the highly reactive N, N-dimethylformamide (DMF) molecules, significantly alleviating the side reactions at the electrode-electrolyte interface, but also the anchored DMF molecule dipole exhibits stronger bond dipole moment (C & boxH; O; 7.1 x 10(-30) C m) than PVDF (C & horbar;F; 3.6 x 10(-30) C m), thus weakens the ion-dipole interaction of Li+<middle dot><middle dot><middle dot>F, making Li+-hopping easily along polymer chains. Consequently, the obtained electrolyte exhibits dramatic electrochemical properties, including a superior ionic conductivity (0.39 mS cm(-1)) and sufficient Li+ transference number (0.54). Additionally, the LFP||Li battery presents an outstanding performance at the wide temperature range of -10-60 degrees C. Even at a high mass loading of approximate to 11 mg cm(-2), the LFP||Li battery also delivers an impressive specific capacity (156.9 mAh g(-1)) along with average coulombic efficiency (99.8%).

引用

页数：11

共 54 条

[1] Dielectric Filler-Induced Hybrid Interphase Enabling Robust Solid-State Li Metal Batteries at High Areal Capacity [J].