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Zn(Cu)Si 2+ x P 3 Solid Solution Anodes for High‐Performance Li‐Ion Batteries with Tunable Working Potentials
Author(s) -
Li Wenwu,
Liao Jun,
Li Xinwei,
Zhang Lei,
Zhao Bote,
Chen Yu,
Zhou Yucun,
Guo Zaiping,
Liu Meilin
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201903638
Subject(s) - faraday efficiency , materials science , anode , electrochemistry , sphalerite , ion , chemical engineering , intercalation (chemistry) , ternary operation , electrode , inorganic chemistry , chemistry , metallurgy , pyrite , organic chemistry , computer science , programming language , engineering
Si‐based anodes with a stiff diamond structure usually suffer from sluggish lithiation/delithiation reaction due to low Li‐ion and electronic conductivity. Here, a novel ternary compound ZnSi 2 P 3 with a cation‐disordered sphalerite structure, prepared by a facile mechanochemical method, is reported, demonstrating faster Li‐ion and electron transport and greater tolerance to volume change during cycling than the existing Si‐based anodes. A composite electrode consisting of ZnSi 2 P 3 and carbon achieves a high initial Coulombic efficiency (92%) and excellent rate capability (950 mAh g −1 at 10 A g −1 ) while maintaining superior cycling stability (1955 mAh g −1 after 500 cycles at 300 mA g −1 ), surpassing the performance of most Si‐ and P‐based anodes ever reported. The remarkable electrochemical performance is attributed to the sphalerite structure that allows fast ion and electron transport and the reversible Li‐storage mechanism involving intercalation and conversion reactions. Moreover, the cation‐disordered sphalerite structure is flexible to ionic substitutions, allowing extension to a family of Zn(Cu)Si 2+ x P 3 solid solution anodes ( x = 0, 2, 5, 10) with large capacity, high initial Coulombic efficiency, and tunable working potentials, representing attractive anode candidates for next‐generation, high‐performance, and low‐cost Li‐ion batteries.