电解质
金属
超分子化学
材料科学
快离子导体
化学工程
纳米技术
无机化学
化学
电极
结晶学
冶金
物理化学
工程类
晶体结构
作者
Lixiang Guan,Shijun Xiao,Tiantian Lu,Lifeng Hou,Huayun Du,Huan Wei,Xiaoda Liu,Chengkai Yang,Yingwei Wei,Qian Wang
出处
期刊:Social Science Research Network
[Social Science Electronic Publishing]
日期:2023-01-01
摘要
Li metal batteries based on solid polymer electrolytes offer the benefits of high energy density and safety, as well as extended cycling life, making them an excellent candidate for the next-generation battery system. However, current solid polymer electrolytes still suffer from low ion conductivity and Li+ transfer number, which seriously restricts its practical application. Herein, a self-supporting composite solid polymer electrolyte was prepared, where phenolic resin rich in hydroxyl groups (BR) and polyethylene oxide (PEO) are mixed evenly and poured onto a cellulose membrane in one step. In such an electrolyte, PEO and BR combine to form intermolecular hydrogen bonds, lowering the crystallinity of PEO and increasing the Li+ transfer number. Lastly, the obtained solid electrolytes exhibited a high ion conductivity (1.1×10-4 S cm-1) and Li+ transfer number (0.53), as well as improved electrochemical window. Consequently, Li || Li symmetrical cells can run stably for more than 700 h at 0.1 mA cm-2/0.25 mAh cm-2. And full cells with LiFePO4 cathode can also demonstrate high discharge capacity of 152.12 mAh g-1 and rate performance. We believe that such a design based on supramolecular interaction offer a new avenue to advanced solid polymer electrolytes.
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