For secondary deterioration / abnormal deterioration which is difficult to predict, we propose development to correspond to materials, components, electrodes / battery design and sensing.
Purpose / Background
● In battery design, life prediction is determined assuming deterioration of materials, components, electrodes, etc., but it may cause abnormal deterioration mechanism which can not be assumed in design and accelerated test, and sudden capacity drop (secondary deterioration) due to a change in deterioration mechanism, etc.
- ・Expansion of inhomogeneous reaction due to aged deterioration
- ・Apparent load increase at capacity drop
- ・Rise in resistance at low temperature and deterioration
Proposal from KRI / Future development / Expected results, etc.
Corresponding to secondary deterioration / abnormal deterioration with design margin / system safety factor can cause energy density reduction and cost increase. It is important to clarify reactive homogeneity and overvoltage deterioration factors that cause secondary degradation and abnormal deterioration.
- ● Analysis of primary deterioration ⇒ secondary deterioration / abnormal deterioration mechanism, understanding of main cause and investigation of deterrence
- ・ Development of materials to suppress secondary deterioration / abnormal deterioration (improvement of Li absorption), electrode / battery design (inhibition of reactive homogeneity)
- ・ Sensing ⇒ Prevention of secondary deterioration by control
- ● Verification of secondary deterioration possibility assuming actual use environment, aging at battery development and adoption
- ● New battery life prediction technology adding secondary degradation prediction to “life prediction method on site”, etc.