电解质
金属锂
阴极
材料科学
电池(电)
锂(药物)
化学工程
理论(学习稳定性)
锂电池
金属
固态
磷酸钒锂电池
无机化学
电极
计算机科学
电气工程
离子
化学
热力学
冶金
离子键合
机器学习
有机化学
功率(物理)
物理化学
内分泌学
工程类
物理
医学
作者
Jingyi Li,Zhenyu Wang,Zhiwei Zhou,Cong Liu,Zhengjiang He,Junchao Zheng,Yunjiao Li,Jing Mao,Kun Dai,Yan Chen
标识
DOI:10.1016/j.jpowsour.2022.231891
摘要
Solid-state lithium metal batteries as promising energy storage devices have gathered many attentions for its appealing properties, such as improved safety and capacity density. Nevertheless, high interfacial resistance, uneven current density and severe Li dendrite growth caused by rigid contact at the cathode-electrolyte interface in solid-state batteries greatly restrict its electrochemical performance and further practical application. Herein, a cathode-electrolyte integrating strategy is proposed to achieve the soft interfacial contact through employing poly(vinylidene fluoride)-based composite electrolyte as the cathode binder and subsequent heat-pressing procedure. Due to the modification strategy, fabricated cells with integrated structure show lower resistance, faster Li-ion transport, enhanced capacity and improved cycle stability. The integrated LiFePO 4 /Li cell exhibits superior electrochemical performance, which present a capacity retention of 93.8% and 91.6% after 300 cycles at 0.5 C and 400 cycles at 1 C, respectively, being able to compare favorably with the conventional cells using liquid electrolyte. Overall, the study provides a solution for designing advanced solid-state lithium metal batteries. • PVDF-based composite solid electrolyte and composite cathode are prepared. • A cathode-electrolyte integrated cell is fabricated by heat-pressing. • The cathode-electrolyte integrating strategy boosts the cycle stability.
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