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

**Authors:** Ahmed Gailani, Rehab Mokidm, Moaath El-Dalahmeh, Maad El-Dalahmeh, Maher Al-Greer  
**arXiv:** [2007.01937](https://arxiv.org/abs/2007.01937)  
**Date:** 2020-07-03  
**Summary page:** https://www.summarizepaper.com/en/paper/2007.01937v1/

## Key points

- Study examines degradation of lithium-ion battery cells from Sony, BYD, and Samsung
- Evaluates performance in powering electric vehicles and integrating grid-connected renewable energy resources
- Battery cells analyzed include Sony and BYD cells with LFP chemistry, as well as a Samsung cell with NMC chemistry
- Extensive experiments conducted to measure capacity fade and resistance increase due to calendar aging and cycle aging
- Key parameters affecting calendar aging identified: charge level and temperature
- Significant factors for cycle aging found to be depth of discharge, current rate, and temperature
- After 30 months of use, Sony LFP cells experienced approximately 5% calendar capacity loss, BYD LFP cells had around 8% loss
- Samsung NMC cell demonstrated better cycle life, reaching 80% state of health after 3000 cycles at a temperature of 35°C and a discharge depth of 75%
- Findings provide insights into degradation behavior of lithium-ion battery cells from different manufacturers
- Understanding degradation over time can help develop strategies to improve lifespan and economic viability for electric vehicle applications and grid integration of renewable energy resources.

## Summary

This study examines the degradation of lithium-ion battery cells from three different manufacturers (Sony, BYD, and Samsung) and evaluates their performance in powering electric vehicles and integrating grid-connected renewable energy resources. The battery cells analyzed include Sony and BYD cells with LFP chemistry, as well as a Samsung cell with NMC chemistry. The researchers conducted extensive experiments to measure the capacity fade and resistance increase of the battery cells due to calendar aging and cycle aging. They identified several key parameters that affect calendar aging, including charge level and temperature. For cycle aging, the depth of discharge, current rate, and temperature were found to be significant factors. The results showed that after 30 months of use, the Sony LFP cells experienced a calendar capacity loss of approximately 5%, while the BYD LFP cells had a loss of around 8%. In comparison, the Samsung NMC cell demonstrated better cycle life, reaching an 80% state of health after 3000 cycles at a temperature of 35°C and a discharge depth of 75%. These findings provide valuable insights into the degradation behavior of lithium-ion battery cells from different manufacturers. By understanding how these batteries degrade over time under various conditions, researchers can develop strategies to improve their lifespan and enhance their economic viability for electric vehicle applications and grid integration of renewable energy resources.