期刊
JOURNAL OF POWER SOURCES
卷 548, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.232045
关键词
lithium -Metal anode; High -voltage cathode; Cathode electrolyte interphase; Solid electrolyte interphase; Asymmetric sustained -release
资金
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- [21808125]
- [2020M672805]
This study demonstrates the targeted stabilization of solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI) in high-voltage lithium-metal batteries by asymmetrically sustained-releasing different additives. The strategy successfully addresses issues like dendrites growth, parasitic side reactions, and transition metals dissolution under high-voltage, resulting in a high capacity retention rate.
High-voltage lithium (Li)-metal batteries with cell-level energy density over 350 Wh kg-1 are promising energy storage systems. However, the aggressive interphase chemistries associated with highly reactive Li-metal anode and high-voltage cathodes impede their practical applications. Herein, we demonstrate the targeted stabilization of solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI) in high-voltage Li-metal batteries by asymmetrically sustained-releasing different additives. An asymmetric sustained-release film loaded with lithium bis-(oxalate)borate (LiBOB) and LiNO3 on each side is investigated as a proof-of-concept. The sustained-releasing of LiBOB and LiNO3 can maintain a localized concentration at the high-voltage cathode and Li-metal anode fronts respectively, thus forming a stable B-containing CEI and N-containing SEI. As such, issues like dendrites growth, parasitic side reactions and transition metals dissolution under high-voltage are addressed simultaneously. Based on this strategy, the 30 mu m Li|LiNi0.5Co0.2Mn0.3O2 (4.1 mAh cm-2) batteries deliver a capacity retention of 80% after 173 cycles under a cut-off voltage of 4.5 V.
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