How the utilised SOC window in commercial Li-ion pouch cells influence battery ageing
Journal article, 2021

In many lithium-ion battery (LIB) applications, e.g. hybrid vehicles and load-levelling storage systems, only part of the state-of-charge (SOC) range needs to be utilised. This offers the possibility to use an optimal SOC window to avoid LIB ageing. Here, a large test matrix is designed to study LIB ageing in a commercial 26 Ah pouch cell, in order to map the ageing behaviour at different SOC levels with respect to temperature and current. A quantification of the degradation modes, loss of lithium inventory (LLI), loss of active positive (LAM(PE)) and negative (LAM(NE)) electrode materials is made by analysing the change in the open circuit voltage (OCV). A key result is that lower SOC intervals significantly improved battery ageing. Even during harsh test conditions, such as high Crates and temperatures, the cells deliver more than three times the expected number of full cycle equivalents. High SOC combined with high C-rate increase ageing where the dominating ageing mechanisms are LLI, followed by LAM(PE).

Cycle life

Battery ageing

State of charge window

Ageing mechanism

Lithium-ion battery

Author

Evelina Wikner

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

Erik Bjorklund

Uppsala University

Johan Fridner

Volvo Cars

Daniel Brandell

Uppsala University

Torbjörn Thiringer

Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

JOURNAL OF POWER SOURCES ADVANCES

2666-2485 (eISSN)

Vol. 8 100054

Subject Categories

Materials Chemistry

Other Chemical Engineering

Other Materials Engineering

DOI

10.1016/j.powera.2021.100054

More information

Latest update

7/2/2021 8