期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 301, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2021.122341
关键词
LLZO; All-solid-state lithium-sulfur battery; Multi-walled carbon nanotubes; Conductive network
资金
- National Key Research and Development Program of China [2018YFB0905600, 2017YFB0310400]
- National Natural Science Foundation of China [51972246]
- Fundamental Research Funds for the Central Universities in China
- State Key Laboratory of Advanced Electromagnetic Engineering and Technology [Huazhong University of Science and Technology]
- 111 project [B13035]
- Science and Technology Project of Global Energy Interconnection Research Institute Co., Ltd. [SGGR0000WLJS1801080]
By synthesizing highly ionic conductive LLZO ceramics and combining them with multi-walled carbon nanotubes to form a conductive network, the electrochemical performance of solid-state lithium-sulfur batteries has been successfully improved.
Traditional liquid lithium-sulfur batteries have two key problems: poor safety and shuttle effect. These two challenges can be overcome by using solid-state electrolytes. But poor ionic and electronic conductivity due to solid/solid contact between the electrode and the electrolyte for all-solid-state lithium-sulfur batteries (ASSLSBs). Here, we have synthesized Li6.4Ga0.2La3Zr2O12(LLZO) conductive ceramics with high ionic conductivity. LLZO is used as the lithium-ion conductor and multi-walled carbon nanotubes (MWCNt) are used as the electronic conductor to form S/MWCNt/LLZO by the thermal diffusion method, resulting in an e(-)/S/Li+ conductive network. The prepared S/MWCNt/LLZO composite material, composite solid electrolyte, and lithium metal are assembled into ASSLSBs. After 50 cycles, the high capacity of 825 mAh.g(-1) is maintained with 72.62% capacity retention at 0.2C and 45 degrees C. The higher capacity indicates the success of forming a conductive network that can improve the electrochemical performance of ASSLSBs. At 0.2C, the capacity of the S/MWCNt/LLZO composite cathode remains at 873 mAh.g(-1) after 60 cycles when the operating temperature is increased to 60 degrees C, indicating good cycle performance.
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