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
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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