聚丙烯腈
材料科学
电解质
化学工程
聚合
阴极
电池(电)
锂(药物)
原位聚合
聚合物
离子电导率
膜
电极
复合材料
化学
内分泌学
物理化学
功率(物理)
工程类
物理
医学
量子力学
生物化学
作者
Zhichuan Shen,Jiawei Zhong,Shiyong Jiang,Wenhao Xie,Shiying Zhan,Kaiji Lin,Linyong Zeng,Hailing Hu,Guide Lin,Yuhan Lin,Shuhui Sun,Zhicong Shi
标识
DOI:10.1021/acsami.2c11397
摘要
Because of their high ionic conductivity, utilizing gel polymer electrolytes (GPEs) is thought to be an effective way to accomplish high-energy-density batteries. Nevertheless, most GPEs have poor adaptability to Ni-rich cathodes to alleviate the problem of inevitable rapid capacity decay during cycling. Therefore, to match LiNi0.8Co0.1Mn0.1O2 (NCM811), we applied pentaerythritol tetraacrylate (PETEA) monomers to polymerize in situ in a polyacrylonitrile (PAN) membrane to obtain GPEs (PETEA-TCGG-PAN). The impedance variations and key groups during the in situ polymerization of PETEA-TCGG-PAN are investigated in detail. PETEA-TCGG-PAN with a high lithium-ion transference number (0.77) exhibits an electrochemical decomposition voltage of 5.15 V. Noticeably, the NCM811|PETEA-TCGG-PAN|Li battery can cycle at 2C for 120 cycles with a capacity retention rate of 89%. Even at 6C, the discharge specific capacity is able to reach 101.47 mAh g-1. The combination of LiF and Li2CO3 at the CEI interface is the reason for the improved rate performance. Moreover, when commercialized LFP is used as the cathode, the battery can also cycle stably for 150 cycles at 0.5C. PETEA and PAN can together foster the transportation of Li+ with the construction of a fast ion transport channel, making a contribution to stable charge-discharge of the above batteries. This study provides an innovative design philosophy for designing in situ GPEs in high-energy-density lithium metal batteries.
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