材料科学
聚丙烯腈
电解质
压电
成核
金属锂
电池(电)
锂(药物)
准固态
化学工程
聚合物
纳米技术
复合材料
电极
物理化学
化学
有机化学
色素敏化染料
内分泌学
功率(物理)
工程类
物理
医学
量子力学
作者
Hongzhi Peng,Zhong Xu,Yunjie Zhou,Junfeng Huang,Tao Yang,Jieling Zhang,Yong Ao,Yanting Xie,Hanyu He,Xiong Zhang,Weiqing Yang,Haitao Zhang
标识
DOI:10.1016/j.jmat.2023.04.011
摘要
Polymer solid-state electrolytes (PSSEs) are promising for solving the safety problem of Lithium (Li) metal batteries (LMBs). However, PSSEs with low modulus in nature are prone to be penetrated by lithium dendrites, resulting in short circuit of LMBs. Here, we design and prepare piezoelectric BaTiO3 doped polyacrylonitrile ([email protected]) quasi-solid-state electrolytes (PQSSEs) by electrostatic spinning method to suppress dendritic growth. The piezoelectric polymer electrolytes are squeezed by nucleation and growth processes of Li dendrites, which can generate a piezoelectric electric field to regulate the deposition of Li+ ions and eliminate lithium bud. Consequently, piezoelectric [email protected] PQSSEs enables highly stable Li plating/stripping cycling for over 2 000 h at 0.15 mA/cm2 at room temperature (RT, 25 °C). Also, LiFePO4|[email protected]|Li full cells demonstrate excellent cycle performance (136.9 mA·h/g and 78% retention after 600 cycles at 0.5 C) at RT. Moreover, LiFePO4|[email protected]|Li battery show extremely high safety and can still work normally under high-speed impact (2 Hz, ∼30 kPa). We construct an in-situ cell monitoring system and disclose that the mechanism of suppressed lithium dendrite is originated from the generation of opposite piezoelectric potential and the feedback speed of intermittent piezoelectric potential signals is extremely fast.
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