Abstract
In this work the self-discharge characteristics are evaluated through resting OCV (open-circuit voltage)-SOC (state-of-charge) hysteresis and storage aging behavior for pouch NCM|graphite lithium-ion battery. A weak peak is found on the OCV-SOC curve of incremental capacity and differential voltage analysis. A low free-energy complex model involving the formation of an absorbed electron-lithium-ion solvation sheath on the graphite surface is proposal for this weak reaction. The electrons are shared between the graphite and electrolyte via lithium-ion. Results of batteries aging tests reveal a strong linear relation of OCV vs. square-root of time, where the dissociation of complex is considered as the mechanism. The dependency of the square-root of time demonstrates that a new concept of voltage drop rate (mV h−1/2) is more feasible by reducing the influence of OCV checking time from 120% to 26%.
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Abbreviations
- CC:
-
Constant current
- C-rate:
-
Current rate
- CV:
-
Constant voltage
- DVA:
-
Differential voltage analysis
- EVs:
-
Electric vehicles
- ICA:
-
Incremental capacity analysis
- NCM:
-
Lithium–nickel–cobalt-manganese oxide
- OCV:
-
Open-circuit voltage
- SOC:
-
State of charge
- k :
-
Rate of voltage decay (mV h−1)
- OCV1 :
-
OCV of first detection (mV)
- OCV2 :
-
OCV of second detection (mV)
- s :
-
OCV drop rate (mV h−1/2)
- t 1 :
-
Time of first OCV detection (h)
- t 2 :
-
Time of second OCV detection (h)
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Funding
This study was financially supported by the National Natural Science Foundation of China (U1802254, 51871201) and Zhejiang Provincial Natural Science Foundation of China (LY18E040003).
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Shan, H., Cao, H., Xu, X. et al. Investigation of self-discharge properties and a new concept of open-circuit voltage drop rate in lithium-ion batteries. J Solid State Electrochem 26, 163–170 (2022). https://doi.org/10.1007/s10008-021-05049-y
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DOI: https://doi.org/10.1007/s10008-021-05049-y