期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 35, 页码 32062-32068出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b12086
关键词
Li-ion batteries; SiOx anode; full cells; prelithiation; initial Coulombic efficiency
资金
- Basic Science Center Project of National Natural Science Foundation of China [51788104]
- National Natural Science Foundation of China [21773264, 51772301]
- National Key R&D Program of China [2016YFA0202500]
- Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21070300]
- CPSF-CAS [2017LH028]
- China Postdoctoral Science Foundation [2017M620913]
Silicon-based electrodes are promising and appealing for futuristic Li-ion batteries because of their high theoretical specific capacity. However, massive volume change of silicon upon lithiation and delithiation, accompanied by continual formation and destruction of the solid-electrolyte interface (SEI), leads to low Coulombic efficiency. Prelithiation of Si-based anode is regarded as an effective way for compensating for the loss of Li+ in the first discharging process. Here, a high-performance lithiated SiOx anode was prepared by using a controllable, efficient, and novel prelithiation strategy. The lithiation of SiOx is homogeneous and efficient in bulk due to well-improved Li+ diffusion in SiOx. Moreover, the in situ formed SEI during the process of prelithiation reduces the irreversible capacity loss in the first cycle and thus improves the initial Coulombic efficiency (ICE). Half-cells and full cells based on the as-prepared lithiated SiOx anode prominently increase the ICE from 79 to 89% and 68 to 87%, respectively. It is worth mentioning that the homogeneously lithiated SiOx anode achieves stable 200 cycles in NCM622//SiOx coin full cells. These exciting results provide applicable prospects of lithiated SiOx anode in the next-generation high-energy-density Li-ion batteries.
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