Tian Changhao, Song Mengyuan, Tang Jiantao, Yuan Haoyang, Ai Chao, Cao Huajun, Huang Tao, Yu Aishui
Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai 200438, China.
Huawei Technologies Co., Ltd., Shenzhen 518116, China.
ACS Appl Mater Interfaces. 2024 Jan 10;16(1):1535-1542. doi: 10.1021/acsami.3c15456. Epub 2023 Dec 22.
The interfacial problem caused by solid-solid contact is an important issue faced by a solid-state electrolyte (SSE). Herein, a cross-linked composite solid electrolyte (CSE) poly(vinylene carbonate) (PVCA)─ethoxylated trimethylolpropane triacrylate (ETPTA)─LiAlGe(PO) (LAGP) (PEL) is prepared by in situ thermal polymerization. The ionic conductivity and Li transference number () of PEL increase significantly due to the addition of LAGP, which can reach 1.011 × 10 S cm and 0.451 respectively. The electrochemical stable window is also widened to 4.68 V. Benefiting from the integrated interfacial structure, the assembled coin cell shows low interfacial resistance. The all-solid-state NCM622|PEL|Li coin cell exhibits an initial discharge capacity of 169.7 mA h g and 70% capacity retention over 100 cycles at 0.2 C, demonstrating excellent cycling stability.
固-固接触引起的界面问题是固态电解质（SSE）面临的一个重要问题。在此，通过原位热聚合制备了一种交联复合固体电解质（CSE）聚碳酸亚乙烯酯（PVCA）─乙氧基化三羟甲基丙烷三丙烯酸酯（ETPTA）─LiAlGe(PO)（LAGP）（PEL）。由于添加了LAGP，PEL的离子电导率和锂迁移数（）显著增加，分别可达1.011×10 S cm和0.451。电化学稳定窗口也拓宽至4.68 V。受益于集成的界面结构，组装的硬币电池显示出低界面电阻。全固态NCM622|PEL|Li硬币电池在0.2 C下的初始放电容量为169.7 mA h g，在100次循环中容量保持率为70%，表现出优异的循环稳定性。
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