Co0.1Fe0.9S2@Li7P3S11正极材料的制备及其在全固态锂电池中的性能

doi:10.19799/j.cnki.2095-4239.2021.0027

储能科学与技术 ›› 2021, Vol. 10 ›› Issue (3): 925-930.doi: 10.19799/j.cnki.2095-4239.2021.0027

• 固态离子学与储能专刊 • 上一篇下一篇

Co_0.1Fe_0.9S₂@Li₇P₃S₁₁正极材料的制备及其在全固态锂电池中的性能

蒋苗^1,²(), 万红利¹, 刘高瞻^1,², 翁伟^1,², 王超¹, 姚霞银^1,²()

^1.中国科学院宁波材料技术与工程研究所，浙江宁波 315201
^2.中国科学院大学，北京 100049

收稿日期:2021-01-19 修回日期:2021-02-14 出版日期:2021-05-05 发布日期:2021-04-30
通讯作者: 姚霞银 E-mail:jiangmiao@nimte.ac.cn;yaoxy@nimte.ac.cn
作者简介:蒋苗（1995—），男，硕士研究生，从事全固态锂电池正极材料研究，E-mail：jiangmiao@nimte.ac.cn
基金资助:
国家自然科学基金(51872303);浙江省自然科学基金(LD18E020004);中国科学院青年创新促进会(2017342┫项目)

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

Miao JIANG^1,²(), Hongli WAN¹, Gaozhan LIU^1,², Wei WENG^1,², Chao WANG¹, Xiayin YAO^1,²()

^1.Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China
^2.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2021-01-19 Revised:2021-02-14 Online:2021-05-05 Published:2021-04-30
Contact: Xiayin YAO E-mail:jiangmiao@nimte.ac.cn;yaoxy@nimte.ac.cn

摘要/Abstract

摘要：

全固态锂电池采用金属硫化物FeS₂作为正极材料能实现较高的可逆比容量，但是循环过程中较大的应力/应变和不良的固固接触引起的界面失效，严重影响了其在全固态锂电池中的电化学性能。本工作采用溶剂热法制备了Co掺杂FeS₂的纳米颗粒，随后在Co_0.1Fe_0.9S₂纳米颗粒表面原位沉积离子电导率较高的Li₇P₃S₁₁固体电解质，获得Co_0.1Fe_0.9S₂@Li₇P₃S₁₁纳米复合材料，并将其应用于全固态锂电池中，过渡金属Co的掺杂能提高FeS₂的电化学反应动力学性能，而Li₇P₃S₁₁固体电解质原位包覆能进一步改善固固接触，提高界面锂离子传输特性，继而提高全固态锂电池电化学性能。进一步通过透射电子显微镜(TEM)表征，证实了Li₇P₃S₁₁固体电解质包覆在Co_0.1Fe_0.9S₂纳米颗粒表面。电化学测试表明，Li₇P₃S₁₁固体电解质颗粒的包覆能有效提高以FeS2为活性物质的全固态锂电池的充放电比容量和循环稳定性。Co0.1Fe0.9S2@Li7P3S11复合材料在200 mA/g的电流密度下，首次放电比容量达到882.1 mA·h/g，循环100圈后放电比容量仍保持在670.9 mA·h/g。本研究有助于推动金属硫化物正极材料在全固态锂电池中的应用，从而为实现更高能量密度的全固态锂电池提供实验依据。

关键词: 全固态锂电池, 掺杂, 原位沉积, 纳米颗粒

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

中图分类号:

TM 912

蒋苗, 万红利, 刘高瞻, 翁伟, 王超, 姚霞银. Co_0.1Fe_0.9S₂@Li₇P₃S₁₁正极材料的制备及其在全固态锂电池中的性能[J]. 储能科学与技术, 2021, 10(3): 925-930.

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.

图/表 5

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Co_0.1Fe_0.9S₂@Li₇P₃S₁₁正极材料的制备及其在全固态锂电池中的性能

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

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