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Maximising Battery Life for High Nickel Batteries by Jeff Dahn! This synopsis taken from the Limiting Factor.
Jeff Dahn is one of the fathers of the Lithium Ion battery, along with John Goodenough, Stan Whittingham, and Akira Yoshino.
The key takeways are:
1) Note: Everything below applies to high nickel batteries in long range vehicles, but may or may not apply to LFP batteries! I can't emphasize this enough. LFP is a very different beast.
2) High temperatures kills batteries. If you go on a holiday during the summer and leave your car at home then leave it at a low SOC (state of charge). For example: At or below 30% SOC
3) Cycle at a low DOD (depth of discharge). For example: between 40-60% rather than 10-80%. The cathode expands and contracts at high DOD, which causes it to break apart.
4) On that note: The lower the DOD, the better. That means charging frequently.
5) Avoid charging the vehicle above 75% SOC. Above 75% side reactions start occuring that cause degradation. This also reduces the volume expansion issues mentioned in 3).
6) Taking all variables into account, operating between 45-70% and storage at ~30% is ideal.
7) Occasional high SOC and DOD are okay! For example, if you need to make a long trip.
8) With good thermal management hardware and battery managment software, supercharging should have minimal negative effect on cycle life.
Watch the Jeff Dahn youtube video if you'd like more specifics!
Jeff Dahn is one of the fathers of the Lithium Ion battery, along with John Goodenough, Stan Whittingham, and Akira Yoshino.
The key takeways are:
1) Note: Everything below applies to high nickel batteries in long range vehicles, but may or may not apply to LFP batteries! I can't emphasize this enough. LFP is a very different beast.
2) High temperatures kills batteries. If you go on a holiday during the summer and leave your car at home then leave it at a low SOC (state of charge). For example: At or below 30% SOC
3) Cycle at a low DOD (depth of discharge). For example: between 40-60% rather than 10-80%. The cathode expands and contracts at high DOD, which causes it to break apart.
4) On that note: The lower the DOD, the better. That means charging frequently.
5) Avoid charging the vehicle above 75% SOC. Above 75% side reactions start occuring that cause degradation. This also reduces the volume expansion issues mentioned in 3).
6) Taking all variables into account, operating between 45-70% and storage at ~30% is ideal.
7) Occasional high SOC and DOD are okay! For example, if you need to make a long trip.
8) With good thermal management hardware and battery managment software, supercharging should have minimal negative effect on cycle life.
Watch the Jeff Dahn youtube video if you'd like more specifics!
