Polymer Competitive Solvation Reduced Propylene Carbonate Cointercalation in a Graphitic Anode

被引：6

作者：

Liu, Qiuyan ^{[1
,2
]}

Xu, Shiwei ^{[3
,4
]}

Li, Xiaoyun ^{[1
,2
]}

Chen, Renjie ^{[5
]}

Wang, Xuefeng ^{[2
,3
,4
]}

Gao, Yurui ^{[2
,6
]}

Wang, Zhaoxiang ^{[1
,2
,3
]}

Chen, Liquan ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Key Lab Renewable Energy, Beijing Key Lab New Energy Mat & Devices, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100190, Peoples R China

[3] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China

[4] Chinese Acad Sci, Inst Phys, Lab Adv Mat & Electron Microscopy, Beijing 100190, Peoples R China

[5] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

[6] Chinese Acad Sci, CAS Ctr Excellence Nanosci, Natl Ctr Nanosci & Technol, Lab Theoret & Computat Nanosci,CAS Key Lab Nanosys, Beijing 100190, Peoples R China

来源：

NANO LETTERS | 2023年 / 23卷 / 07期

基金：

中国国家自然科学基金;

关键词：

propylene-carbonate-based electrolyte; graphite; cointercalation; solvation; SOLID-ELECTROLYTE; LITHIUM; INTERCALATION; INTERFACE; INTERPHASE; STABILITY; ADDITIVES; ENERGY; FTIR; SALT;

D O I：

10.1021/acs.nanolett.2c04898

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Polymer electrolytes have been studied as an alternative to organic liquid electrolytes but suffer from low ionic conductivity. Propylene carbonate (PC) proves to be an interesting solvent but is incompatible with graphitic anodes due to its cointercalation effect. In this work, adding poly(ethylene oxide) (PEO) into a PC-based electrolyte can alter the solvation structure as well as transform the solution into a polymer electrolyte with high ionic conductivity. By spectroscopic techniques and calculations, we demonstrate that PEO can compete with PC in solvating the Li+ ions, reducing the Li+-PC bond strength, and making it easier for PC to be desolvated. Due to the unique solvation structure, PC-cointercalation-induced graphite exfoliation is inhibited, and the reduction stability of the electrolyte is improved. This work will extend the applications of the PC-based electrolytes, deepen the understandings of the solvation structure, and spur designs of advanced electrolytes.

引用

页码：2623 / 2629

页数：7

共 43 条

[1] THE STUDY OF LI-GRAPHITE INTERCALATION PROCESSES IN SEVERAL ELECTROLYTE SYSTEMS USING IN-SITU X-RAY-DIFFRACTION [J].