Fast Charge-Driven Li Plating on Anode and Structural Degradation of Cathode. Issue 14 (19th October 2020)

• Record Type: Journal Article
• Authors: Son, Seoung-Bum; Robertson, David; Yang, Zhenzhen; Tsai, Yifen; Lopykinski, Susan; Bloom, Ira
• Is Part Of: Journal of the Electrochemical Society. Volume 167:Issue 14(2020)
• Publication Date: 2020-10-19
• Subjects: Batteries Li-ion -- Fast charging -- Li plating; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/abc031
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Enabling fast charging in lithium ion batteries (LIBs) is a key factor to make electric vehicles drive just like gasoline-powered vehicles when the time comes to refuel. However, fast charging to current LIBs (LiNix Mny Co1−z O2 /graphite) is limited by lithium plating, which is barely reversible and causes LIBs to lose capacity over time. Thus, research to quantify the lithium plating in LIB cells is extremely important in improving our fundamental understanding of lithium plating behavior and enabling fast charging for LIBs. In this study, we precisely quantified the amount of fast-charge-driven lithium plating in a coin-cell composed of LiNi0.5 Mn0.3 Co0.2 O2 (NMC532)/graphite. We found that the amount of lithium plating gradually increases with the cycle count and reaches 25.59 μmole (26.80 mAh g −1 cathode ) by the 100th cycle. The study also reveals that the NMC532 has lost 19% of its original lithium content after 100 fast-charging cycles; this, correspondingly, causes a lattice volumetric strain of 0.59%.