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Core‐Shell‐Structured SiO x —C Composite for Lithium‐Ion Battery Anodes
Author(s) -
Zhang Junying,
Ma Peipei,
Zhang Xiaoming,
Liu Zhi,
Zheng Jun,
Zuo Yuhua,
Xue Chunlai,
Cheng Buwen,
Li Chuanbo
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201800800
Subject(s) - anode , materials science , faraday efficiency , composite number , lithium (medication) , chemical engineering , lithium ion battery , battery (electricity) , electrode , raw material , carbon fibers , composite material , chemistry , physics , engineering , quantum mechanics , organic chemistry , endocrinology , medicine , power (physics)
A simple method to synthesize a uniform composite material consisting of wet‐milled SiO x core and carbon shell is studied. This SiO x —C core‐shell composite is then used as anode materials for lithium‐ion batteries, with wet‐milled SiO x and raw SiO x anodes used for comparison. It is found that the batteries fabricated with wet‐milled SiO x —C composite show the best cyclic performance and excellent rate capability compared with wet‐milled SiO x and raw SiO x . This approach is beneficial because of the reduced size of wet‐milled SiO x powders. The coating of carbon shell is effective in improving the conductivity of SiO x and diminishing the volume effect during lithiation/delithiation processes. Moreover, the Li 2 O and Li 4 SiO 4 generated in the first cycle further suppress the volume effects. Under the galvanostatic mode with charging and discharging current density of 0.1 Ag −1 , the wet‐milled SiO x —C composite electrode delivers an initial reversible capacity of 1279 mAh g −1 , with a capacity retention as high as 97.3% (1244 mAh g −1 ) even after 170 cycles and coulombic efficiency as high as 99.8%. This approach is simple and has great potential for the large‐scale production of high‐performance SiO x ‐based anode materials.