Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 13, Pages 15337-15345Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02466
Keywords
silicon monoxide; magnesium silicide; initial coulombic efficiency; lithium ion batteries
Funding
- National Natural Science Foundation of China [51872305, 52002381]
- China Postdoctoral Science Foundation [2019M662125]
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This study reports an economical and convenient method to increase the initial Coulombic efficiency (ICE) of silicon monoxide (SiO) anode material and successfully synthesizes a reaction product (MSO) with a core-shell structure. The MSO exhibits superior ICE, reversible capacity, and improved cyclic stability.
Silicon monoxide (SiO) is considered as one of the most promising anode material candidates for next-generation high-energy-density lithium ion batteries (LIBs) due to its high specific capacity and relatively lower volume expansion than that of Si. However, a large number of irreversible products are formed during the first charging and discharging process, resulting in a low initial Coulombic efficiency (ICE) of SiO. Herein, we report an economical and convenient method to increase the ICE of SiO without sacrificing its specific capacity by a solid reaction between magnesium silicide (Mg2Si) and micron-sized SiO. The reaction product (named MSO) exhibits a unique core-shell structure with uniformly distributed Mg2SiO4 and Si as the shell and disproportionated SiO as the core. MSO exhibits a superior ICE and a high reversible capacity of 81.7% and 1306.1 mAh g(-1), respectively, which can be further increased to 88.7% and 1446.4 mAh g(-1) after carbon coating, and improved cyclic stability compared to bare SiO. This work provides a simple yet effective strategy to address the low ICE issue of SiO anode materials to promote the practical application of SiO.
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