Analysis of Lithium-ion Battery Cells Degradation Based on Different Manufacturers

TL;DR

This paper compares degradation behaviors of lithium-ion batteries from Sony, BYD, and Samsung, highlighting how chemistry and usage conditions affect capacity loss and cycle life.

Contribution

It provides extensive experimental data on battery degradation from different manufacturers and chemistries under various aging conditions.

Findings

LFP batteries from Sony and BYD show 5-8% capacity loss after 30 months.

Samsung NMC battery retains 80% capacity after 3000 cycles at 35°C.

Cycle life varies significantly with chemistry and operating parameters.

Abstract

Lithium-ion batteries are recognised as a key technology to power electric vehicles and integrate grid-connected renewable energy resources. The economic viability of these applications is affected by the battery degradation during its lifetime. This study presents an extensive experimental degradation data for lithium-ion battery cells from three different manufactures (Sony, BYD and Samsung). The Sony and BYD cells are of LFP chemistry while the Samsung cell is of NMC. The capacity fade and resistance increase of the battery cells are quantified due to calendar and cycle aging. The charge level and the temperature are considered as the main parameters to affect calendar aging while the depth of discharge, current rate and temperature for cycle aging. It is found that the Sony and BYD cells with LFP chemistry has calendar capacity loss of nearly 5% and 8% after 30 months respectively. Moreover, the Samsung NMC cell reached 80% state of health after 3000 cycles at 35C and 75% discharge depth suggesting a better cycle life compared to the other two battery cells with the same conditions