A Real Time Adaptive Charging Approach for Cycle Life Extension of Li Ion Cells. Issue 5 (19th May 2021)

• Record Type: Journal Article
• Authors: Swernath, Subramanian; Hariharan, Krishnan S; Battle, Jason; Kaushik, Anshul; Mandli, Aravinda R.; Agarwal, Samarth; Patil, Rajkumar Subhash; Yadu, Ankit; Tagade, Piyush; Mayya, K Subramanya; Jo, Jeonghoon
• Is Part Of: Journal of the Electrochemical Society. Volume 168:Issue 5(2021)
• Publication Date: 2021-05-19
• Subjects: Electrochemical Engineering -- Batteries- Li-ion -- Theory and Modelling; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/1945-7111/abfd72
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : It is commonly understood that preservation of Lithium-ion battery life comes at the expense of charge time. In this manuscript a novel real time charging framework has been developed that charges the battery in a time as fast as the constant current-constant voltage (CC-CV) protocol while ensuring minimum loss of cycle life. The framework consists of a reduced order electrochemical model integrated with an optimization routine. The charge profile adapts to the battery state of charge and health in real time and is amenable for on-device implementation. Cycle life benefits of the novel adaptive charging profile are compared with traditional CC-CV charging of commercial Lithium-ion batteries cycled until end of life. In addition to the running capacity, battery health is also compared at a low probe C-rate(C/5) to assess the benefits in minimizing irreversible losses. A differential voltage analysis of Probe (C/5 rate) reveals that adaptive charging is able to eliminate the loss of active material (LAM) that is seen typically at advanced cycles. The framework is implemented on a mobile device and shows a substantial benefit in battery life without any penalty on the charge time.