Interfacial Interaction of Multifunctional GQDs Reinforcing Polymer Electrolytes For All-Solid-State Li Battery

被引：15

作者：

Liu, Huaxin ^{[1
]}

Xu, Laiqiang ^{[1
]}

Tu, Hanyu ^{[1
]}

Luo, Zheng ^{[1
]}

Zhu, Fangjun ^{[1
]}

Deng, Wentao ^{[1
]}

Zou, Guoqiang ^{[1
]}

Hou, Hongshuai ^{[1
]}

Ji, Xiaobo ^{[1
]}

机构：

[1] Cent South Univ, Coll Chem & Chem Engn, State Key Lab Powder Met, Changsha 410083, Peoples R China

来源：

SMALL | 2023年 / 19卷 / 33期

基金：

中国国家自然科学基金;

关键词：

composite polymer electrolytes; graphene quantum dots; ion transport; solid state lithium batteries;

D O I：

10.1002/smll.202301275

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Solid-state polymer electrolytes are highly anticipated for next generation lithium ion batteries with enhanced safety and energy density. However, a major disadvantage of polymer electrolytes is their low ionic conductivity at room temperature. In order to enhance the ionic conductivity, here, graphene quantum dots (GQDs) are employed to improve the poly (ethylene oxide) (PEO) based electrolyte. Owing to the increased amorphous areas of PEO and mobility of Li+, GQDs modified composite polymer electrolytes achieved high ionic conductivity and favorable lithium ion transference numbers. Significantly, the abundant hydroxyl groups and amino groups originated from GQDs can serve as Lewis base sites and interact with lithium ions, thus promoting the dissociation of lithium salts and providing more ion pathways. Moreover, lithium dendrite is suppressed, associated with high transference number, enhanced mechanical properties and steady interface stability. It is further observed that all solid-state lithium batteries assembled with GQDs modified composite polymer electrolytes display excellent rate performance and cycling stability.

引用

页数：11

共 38 条

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