文献类型：期刊文献

英文题名：A Covalent Heterostructure of Metal Phosphide Quantum Dots Anchored in N, P Co-doped Carbon Nanocapsules for Fast and Durable Lithium Storage

作者：Ma, Xiangdong Ji, Chuang Yu, Xiaoyuan Liu, Yike Xiong, Xunhui

第一作者：Ma, Xiangdong

通信作者：Xiong, XH[1]

机构：[1]South China Univ Technol, Sch Environm & Energy, New Energy Res Inst, Guangzhou Key Lab Surface Chem Energy Mat, Guangzhou 510006, Peoples R China;[2]South China Agr Univ, Coll Mat & Energy, Key Lab Biobased Mat & Energy, Minist Educ, Guangzhou 510642, Guangdong, Peoples R China;[3]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China

第一机构：South China Univ Technol, Sch Environm & Energy, New Energy Res Inst, Guangzhou Key Lab Surface Chem Energy Mat, Guangzhou 510006, Peoples R China

通信机构：corresponding author), South China Univ Technol, Sch Environm & Energy, New Energy Res Inst, Guangzhou Key Lab Surface Chem Energy Mat, Guangzhou 510006, Peoples R China.

年份：2021

卷号：13

期号：45

起止页码：53965-53973

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20214611177713);Scopus(收录号：2-s2.0-85119079525);WOS:【SCI-EXPANDED(收录号:WOS:000752873200004)】；

基金：We gratefully acknowledge the financial support from the National Natural Science Foundation of China (51874142), Pearl River S& T Nova Program of Guangzhou (201806010031), Fundamental Research Funds for the Central Universities (2019JQ09), Guangdong Innovative and Entrepreneurial Research Team Program (2016ZT06N569), Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program (2019TQ05L903), and Young Elite Scientists Sponsorship Program by CAST (2019QNRC001).

语种：英文

外文关键词：Co2P; anode materials; covalent heterostructure; conversion reaction kinetics; lithium ion batteries

摘要：Transition-metal phosphides (TMPs) anodes for lithium ion batteries (LIBs) usually show poor rate capability and rapid capacity degradation owing to their low electronic conductivities, huge volumetric changes, as well as inferior reversibility of the discharge product Li3P. Herein, a covalent heterostructure with TMPs quantum dots anchored in N, P co-doped carbon nanocapsules (NPC) has been prepared in which the P element in TMPs is simultaneously doped into the carbon matrix. As a proof of concept, Co2P quantum dots covalently anchored in NPC (Co2P QDs/ NPC) is prepared and evaluated as an anode for LIBs. The Co2P QDs/NPC electrode not only demonstrates a high capacity and an extraordinary rate performance but also delivers an impressive cyclability with a high capacity retention of 102.5% after 1600 cycles, one of the best reported values for TMPs-based electrode materials for LIBs. The covalent heterostructure can facilitate the electron/ion transfer and maintain the structural stability during the intensive cycles. Moreover, density functional theory calculations demonstrate that the interfacial covalent coupling can enhance the electrochemical reversibility of the discharge product Li3P in the charge processes via lowering the conversion reaction energies. This work presents an effective interfacial engineering strategy for developing high-performance TMPs anodes for advanced LIBs.