期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 45, 页码 53965-53973出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c16730
关键词
Co2P; anode materials; covalent heterostructure; conversion reaction kinetics; lithium ion batteries
资金
- 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]
- Young Elite Scientists Sponsorship Program by CAST [2019QNRC001]
A covalent heterostructure with TMPs quantum dots anchored in N, P co-doped carbon nanocapsules has been prepared as an anode for LIBs, showing outstanding performance. The heterostructure facilitates electron/ion transfer, maintains structural stability, and enhances the electrochemical reversibility of Li3P discharge product.
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.
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