title: Recovery Strategy and Mechanism of Aged Lithium Ion Batteries after Shallow Depth of Discharge at Elevated Temperature.
abstract: Performance degradation of prismatic lithium ion batteries (LIBs) with LiCoO2 and mesocarbon microbead as active materials is investigated at an elevated temperature for shallow depth of discharge. Aged LIBs are disassembled to characterize the interface morphology, bulk structure, and reversible capacity of an individual electrode. It is found that the formation of interfacial blocking layer (IBL) on the anode results in the cathode state of charge (SOC) offset, which is the primary reason for the cathode degradation. The main capacity degradation of the anode is attributed to the IBL on the anode surface that impedes the intercalation and deintercalation of lithium ions. Because the full battery capacity is limited by the cathode during aging, the cathode SOC offset is the most important reason for the full battery capacity loss. Interestingly, the capacity of aged LIBs can be recovered to a relative high level after adding the electrolyte, rather than the solvent. This recovery is attributed to the relief of the cathode SOC offset and the dissolution of the anode IBL, which reopens the intercalation and deintercalation paths of lithium ions on the anode. Moreover, it is revealed that the relief of cathode SOC offset and the dissolution of anode IBL trigger and promote mutually to drive the recovery of LIBs.
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Yingzhi
authors: Y
authors: Cui
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Chunyu
authors: C
authors: Du
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Yunzhi
authors: Y
authors: Gao
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Jie
authors: J
authors: Yang
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Lingling
authors: L
authors: Zhang
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Ting
authors: T
authors: Guan
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Lijie
authors: L
authors: Yang
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Xinqun
authors: X
authors: Cheng
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Pengjian
authors: P
authors: Zuo
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Yulin
authors: Y
authors: Ma
authors: Institute of Advanced Chemical Power Sources, School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, China.
authors: Geping
authors: G
authors: Yin
keywords: capacity recovery; degradation; elevated temperature; interfacial blocking layer; shallow depth of discharge; state of charge offset