Aging Behavior of Lithium Titanate Battery under High-Rate Discharging Cycle

Chu Wang, Zehui Liu, Yaohong Sun, Yinghui Gao and Ping Yan
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Chu Wang: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Zehui Liu: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Yaohong Sun: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Yinghui Gao: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Ping Yan: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2021, vol. 14, issue 17, 1-14

Abstract: The high-rate discharging performance of a lithium titanate battery is one of its main properties. In conditions that require ultra-high-rate discharging, a lithium titanate battery can be discharged continuously at a current of 50 C (50 times of its maximum capacity) or higher. In this paper, we take cylindrical steel shell lithium titanate cells as the research object and perform aging cycles at 66 C on these cells. The ultra-high-rate discharging cycles cause a rapid high-power capacity fading while the available capacity at normal current rate is not affected. The capacity at 66 C decreases to 80% of initial value in 10 cycles. This paper also analyzes the aging process of a lithium titanate battery at high-rate discharging with incremental capacity (IC) analysis, and presents the aging behavior of lithium titanate battery qualitatively, which is inconsistent with existing research. We attribute the aging mechanism of ultra-high-rate discharging cycles to the decrease of ionic mobility and increase of polarization resistance. Mechanical damage is observed in the CT scan of an aged cell, which we presume to be the result of rapid strain of cathode material.

Keywords: lithium titanate battery; high-rate discharging; cycle life; aging mechanisms (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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