Co0.1Fe0.9S2@Li7P3S11composite cathode material for all-solid-state lithium batteries

doi:10.19799/j.cnki.2095-4239.2021.0027

Abstract

Abstract:

All-solid-state lithium batteries with metal sulfide pyrite (FeS₂) as cathode can achieve a high reversible specific capacity. However, the large stress/strain and poor solid-solid contact during cycling seriously impedes the electrochemical performances of all-solid-state lithium batteries. In this work, Co-doped FeS₂ nanoparticles are synthesized by the solvothermal method, and the Li₇P₃S₁₁ solid electrolytes are in-situ coated on the surface of Co_0.1Fe_0.9S₂ nanoparticles to form Co_0.1Fe_0.9S₂@Li₇P₃S₁₁ nanocomposite materials. The doping of the transition metal Co can improve the electrochemical reaction kinetics of FeS₂, and the in-situ coating of Li₇P₃S₁₁ solid electrolyte can further improve the solid-solid contact and lithium-ion transportation at the interface, which results in excellent electrochemical performances of the all-solid-state lithium batteries. Transmission electron microscopy observation confirms that Li₇P₃S₁₁ solid electrolyte is coated on the surface of Co_0.1Fe_0.9S₂ nanoparticles. Electrochemical performance tests show that the coating of Li₇P₃S₁₁ solid electrolyte can effectively improve the specific capacity and cycling stability of FeS₂-based all-solid-state lithium batteries. The Co_0.1Fe_0.9S₂@Li₇P₃S₁₁ composite cathode delivers a high discharge capacity of 882.1 mA·h/g at 200 mA g^-1 and maintains a value of 670.9 mA·h/g after 100 cycles. This work can promote the application of metal sulfide cathode materials for all-solid-state lithium batteries and provide experimental evidence for the development of all-solid-state lithium batteries with a higher energy density.

Key words: all-solid-state lithium battery, doping, in-situ deposition, nanoparticles

CLC Number:

TM 912

Miao JIANG, Hongli WAN, Gaozhan LIU, Wei WENG, Chao WANG, Xiayin YAO. Co_0.1Fe_0.9S₂@Li₇P₃S₁₁composite cathode material for all-solid-state lithium batteries[J]. Energy Storage Science and Technology, 2021, 10(3): 925-930.

Figures/Tables 5

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References 19

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Co_0.1Fe_0.9S₂@Li₇P₃S₁₁composite cathode material for all-solid-state lithium batteries

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