Free-standing sulfide/polymer composite solid electrolyte membranes with high conductance for all-solid-state lithium batteries
Free-standing sulfide/polymer composite solid electrolyte membranes with high conductance for all-solid-state lithium batteries
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用于全固态锂电池的高电导自支撑硫化物/聚合物复合固体电解质膜
DOI：
10.1016/j.ensm.2019.10.020
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发表时间：
2020-03
影响因子：
20.4
通讯作者：
Nan Ce-Wen
中科院分区：
文献类型：
--
作者：
Zhang Yibo;Chen Rujun;Wang Shuo;Liu Ting;Xu Bingqing;Zhang Xue;Wang Xinzhi;Shen Yang;Lin Yuan-Hua;Li Ming;Fan Li-Zhen;Li Liangliang;Nan Ce-Wen
体积型全固态锂电池（ASSLBs）具有较高的理论容量和良好的安全性，被认为是未来储能设备的有前途的候选人。采用无机电解质的asslb通常具有较厚的电解质层（大于1 mm），这显著降低了电池基能量密度；因此，一种独立的低厚度高导电解质层对于高性能asslb至关重要。本文采用液相法制备了厚度为120 μm的聚合物电解质增强的独立78li2s - 22p2s5玻璃陶瓷（7822gc）复合固体电解质膜，并系统研究了溶剂和聚合物电解质对7822gc/聚合物复合膜微观结构和电化学性能的影响。在室温下，不含锂盐的硫化物/PEO和硫化物/PVDF复合电解质的离子电导率为2-4 × 10−4S cm−1，而含锂盐的硫化物/PEO和硫化物/PVDF复合电解质的离子电导率为4-7 × 10−4S cm−1。在这样的高电导率和低厚度条件下，复合电解质膜的超高面电导率为59.0 mS cm−2，是纯7822gc电解质球团的约2.7倍。制备了硫/碳纳米管复合阴极和锂合金阳极的全固态锂硫电池（ASSLSBs）。电池基能量密度高达87.0 Ah L−1。采用7822gc/聚合物复合电解质膜的电池在100次循环后的放电容量为725.1 mA h g−1at 0.176 mA cm−2，容量保持率为93.2%。
Bulk-type all-solid-state lithium batteries (ASSLBs) with high theoretical capacity and good safety are considered to be promising candidates as future energy storage devices. The ASSLBs with inorganic electrolytes usually have a thick electrolyte layer (more than 1 mm), which significantly reduces the cell-based energy density; therefore, a free-standing high-conductance electrolyte layer with a low thickness is essential for high-performance ASSLBs. In this work, we prepare free-standing 78Li2S–22P2S5glass-ceramic (7822gc) composite solid electrolyte membranes reinforced with polymer electrolytes with a thickness of 120 μm through a liquid-phase method and systematically investigate the effects of solvents and polymer electrolytes on the microstructure and electrochemical properties of the 7822gc/polymer composite membranes. The sulfide/PEO and sulfide/PVDF composite electrolytes without lithium salt show an ionic conductivity of 2–4 × 10−4S cm−1at room temperature, while the conductivity of those with lithium salt is enhanced to 4–7 × 10−4S cm−1. With such a high conductivity and low thickness, an ultra-high areal conductance of 59.0 mS cm−2is obtained for the composite electrolyte membranes, which is ~2.7 times of that of pure 7822gc electrolyte pellets. All-solid-state lithium-sulfur batteries (ASSLSBs) with a sulfur/carbon nanotube composite cathode and a Li–In alloy anode are prepared. The cell-based energy density is as high as 87.0 Ah L−1. A discharge capacity of 725.1 mA h g−1at 0.176 mA cm−2after 100 cycles and a high capacity retention of 93.2% are achieved for the cells with 7822gc/polymer composite electrolyte membranes.
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