This video explains what battery degradation is, explains when and how it occurs, explores battery degradation mechanisms and modes in depth and explains how electric vehicle battery degradation can be minimised.

Tesla Battery Tech Explained Series:
Part 1:    • Tesla's Battery Tech Explained: Part ...  
Part 2:    • Tesla's Battery Tech Explained: Part ...  
Part 3:    • Tesla's Battery Tech Explained: Part ...  

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Sources:

1- C.Birkl et al (2016), ‘Degradation diagnostics for lithium ion cells’ - https://doi.org/10.1016/j.jpowsour.20...

2. W.Sarwar et al (2016), ‘Hybridised energy storage systems for automotive powertrain applications’ - http://hdl.handle.net/10044/1/449753.

3. Kandler Smith et al (2015), ‘Reduced Order Modeling of Mechanical Degradation Induced Performance Decay in Lithium-Ion Battery Porous Electrodes’ - doi: 10.1149/2.0241509jes

4. A.Whitehead et al (2005), ‘Current Collectors for Positive Electrodes of Lithium-Based Batteries’ - doi: 10.1149/1.2039587

5. J. Vetter et al (2005), ‘Ageing mechanisms in lithium-ion batteries’ - doi:10.1016/j.jpowsour.2005.01.006.

6. T.Waldmann et al (2014), ‘Temperature dependent ageing mechanisms in Lithium-ion batteries – A Post-Mortem study’ - https://doi.org/10.1016/j.jpowsour.20...