文献类型：期刊文献

英文题名：Atomic Interface Catalytically Synthesizing SnP/CoP Hetero-Nanocrystals within Dual-Carbon Hybrids for Ultrafast Lithium-Ion Batteries

作者：Hu, Chen[1];Hu, Yanjie[1];Chen, Aiping[1];Duan, Xuezhi[2];Jiang, Hao[1];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Mat Sci & Engn, Minist Educ,Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Shanghai 200237, Peoples R China

年份：2022

卷号：18

起止页码：154

外文期刊名：ENGINEERING

收录：;EI(收录号：20224212902090);WOS:【SCI-EXPANDED(收录号:WOS:000923184700001)】；

基金：Acknowledgments This work was supported by the National Natural Science Foun-dation of China (21975074, 21838003, and 91834301) , the SocialDevelopment Program of Shanghai (17DZ1200900) , the Shanghai Scientific and Technological Innovation Project (18JC1410500) , and the Fundamental Research Funds for the Central Universities (222201718002) .

语种：英文

外文关键词：Catalytic phosphorization; SnP; Hetero-nanocrystals; Fast charging; Li-ion batteries

摘要：Tin phosphides are attractive anode materials for ultrafast lithium-ion batteries (LIBs) because of their ultrahigh Li-ion diffusion capability and large theoretical-specific capacity. However, difficulties in synthesis and large size enabling electrochemical irreversibility impede their applications. Herein, an in situ catalytic phosphorization strategy is developed to synthesize SnP/CoP hetero-nanocrystals within reduced graphene oxide (rGO)-coated carbon frameworks, in which the SnP relative formation energy is significantly decreased according to density functional theory (DFT) calculations. The optimized hybrids exhibit ultrafast charge/discharge capability (260 mA center dot h center dot g(-1) at 50 A center dot g(-1)) without capacity fading (645 mA center dot h center dot g(-1) at 2 A center dot g(-1)) through 1500 cycles. The lithiation/delithiation mechanism is disclosed, showing that the 4.0 nm sized SnP/CoP nanocrystals possess a very high reversibility and that the previously formed metallic Co of CoP at a relatively high potential accelerates the subsequent reaction kinetics of SnP, hence endowing them with ultrafast charge/discharge capability, which is further verified by the relative dynamic current density distributions according to the finite element analysis. (c) 2022 THE AUTHORS. Published by Elsevier LTD on behalf of Chinese Academy of Engineering and Higher Education Press Limited Company. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).