Balance between ion migration and electron transport in composite cathodes for all-solid-state lithium-sulfur batteries

doi:10.19799/j.cnki.2095-4239.2020.0002

Abstract

Abstract:

All-solid-state lithium-sulfur batteries (ASSLSBs) are strong candidates for next-generation energy-storage systems owing to their high theoretical energy density and the ability to eliminate the shuttle effect. The insulation of sulfur in solid-state cathodes requires additional ionic and electronic conductors, where the balance between ion and electron transport is crucial for a stable electrochemical reaction. In addition, for high-energy-density batteries, it is important to develop composite cathodes with high sulfur content and less amount of inactive substances. Herein, we investigate the balance between ion migration and electron transport by adjusting the content of sulfide electrolyte Li₁₀GeP₂S₁₂(LGPS) and carbon nanotubes (CNTs) under high sulfur content (40% of weight fraction). Sulfur cathodes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy. The ionic and electronic conductivities of composite cathodes were measured separately. Electrochemical tests indicate that ion transportation is hindered when LGPS content reduces, while the electronic conductivity is limited by the considerable excess of LGPS electrolytes. By comparing the specific capacity in the first cycle and capacity retention in the following cycle, we conclude that the optimal solution should contain 15% CNT and 45% (weight fraction) LGPS. In this case, the discharge specific capacity of ASSLSBs is 621 mA·h·g^-1 and the rate of capacity decay is 3%.

Key words: all-solid-state lithium-sulfur battery, sulfide electrolyte, composite cathode, ion and electron transport, high sulfur content

CLC Number:

TM 911

YE Ge, YUAN Hong, ZHAO Chenzi, ZHU Gaolong, XU Lei, HOU Lipeng, CHENG Xinbing, HE Chuanxin, NAN Haoxiong, LIU Quanbin, HUANG Jiaqi, ZHANG Qiang. Balance between ion migration and electron transport in composite cathodes for all-solid-state lithium-sulfur batteries[J]. Energy Storage Science and Technology, 2020, 9(2): 339-345.

Figures/Tables 7

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试剂名称	规格
单质硫（S）	颗粒大小 < 50 μm
Li₁₀GeP₂S₁₂（LGPS）	离子导率2.5 mS/cm
铟（In）	厚度100 μm
金属锂（Li）碳纳米管（CNT）	厚度 100 μm 比表面积 274 m²/g

物质	质量/mg	备注
单质硫（S）正极	5 13.16	面密度5 mg/cm²，利用率60% 硫含量38%
Li₂S-P₂S₅（LPS）	9.4	厚度50 μm
负极	2.625	过量20%
铜箔铝箔	5.4 2.7	厚度 6 μm 厚度 10 μm

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