双功能氮氧化钛-碳涂层提升高容量锂离子电池用SiOx的储锂性能
Boosting lithium storage of SiOx via a dual-functional titanium oxynitride-carbon coating for robust and high-capacity lithium-ion batteries
黄秀换 1韦秀娟 2赖国勇 1陈浩 1吴曙星 1罗冬 1林展 2张山青2
作者信息
- 1. Institute for Sustainable Transformation,School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China
- 2. Institute for Sustainable Transformation,School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China;Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory),Jieyang 515200,China
- 折叠
摘要
非化学计量微米氧化硅(SiOx)由于其高理论容量和低成本,有望成为锂离子电池石墨负极材料的替代品.然而,SiOx的实际应用仍然受到其较差的固有导电性和循环过程中明显的体积变化的阻碍.在本工作中,为了同时解决这些问题,我们使用可规模化的溶剂热和热还原方法制备了具有TiO1-yNy-C涂层的SiOx基负极材料(SiOx@TiON-C).我们通过系统性研究发现,TiO1-yNy-C涂层可以适应SiOx循环过程中大的体积变化且有效提高其导电性.因此,SiOx@TiON-C负极具有突出的储锂性能.具体而言,SiOx@TiON-C负极可以在500 mA g-1的电流密度下循环500圈后仍保持750.2 mA h g-1的优异可逆容量,75.1％的初始库仑效率和优异的倍率性能.这项工作为促进下一代锂离子电池微米SiOx基负极材料的实际商业化提供了一种很有前途的方法.
Abstract
Nonstoichiometric microstructured silicon suboxide(SiOx)could be an attractive alternative to graphite as the anode materials of lithium-ion batteries(LIBs)due to its high theoretical capacity and low cost.However,practical applications of SiOx are hampered by their inferior inherent conductivity and distinct volume changes during cycling.In this work,in order to address these issues simultaneously,we designed and fabricated SiOx-based anode materials with TiO1-yNy-carbon coating layer(SiOx@TiON-C)using a scal-able solvothermal and thermal reduction method.Our sys-tematic investigations suggest that TiO1-yNy and the C coating layer could accommodate large volume variation and promote electrical conductivity of SiOx during cycling,respectively.As a result,the as-prepared SiOx@TiON-C anode exhibits su-perior lithium storage performance.Specifically,the resultant SiOx@TiON-C anode could deliver an outstanding reversible capacity of 750.2 mA h g-1 at 500 mA g1 after 500 cycles,high initial Coulombic efficiency of 75.1％and excellent rate cap-ability.This work offers a promising approach to promote the practical commercialization of microstructured SiOx-based anode materials for next-generation LIBs.
关键词
SiOx-based anode/TiON-C coating/high con-ductivity/superior lithium storageKey words
SiOx-based anode/TiON-C coating/high con-ductivity/superior lithium storage引用本文复制引用
基金项目
National Natural Science Foundation of China(52102225)
National Natural Science Foundation of China(51874104)
Startup Research Grant of Guangdong University of Technology,China(220413729)
出版年
2024
NETL
NSTL
万方数据