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Electrolyte additive to improve performance of MCMB/LiNi1/3Co1/3Mn1/3O2 Li-ion cell

✍ Scribed by Yan Qin; Zonghai Chen; Wenquan Lu; Khalil Amine

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
680 KB
Volume
195
Category
Article
ISSN
0378-7753

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✦ Synopsis

The electrolyte additive, 3,9-divinyl-2,4,8,10-tetraoxaspiro[5,5] undecane (TOS), was investigated as a means to improve the life of mesocarbon microbead (MCMB)/Li 1.1 [Ni 1/3 Co 1/3 Mn 1/3 ] 0.9 O 2 (NCM) cells for high-power applications. With the addition of an appropriate amount of TOS (no more than 1 wt%) to MCMB/NCM cells, the capacity retention was significantly improved at 55 β€’ C compared with cells containing pristine electrolyte. Aging tests at 55 β€’ C indicated that the capacity retention of the negative electrode had benefited as a result of the formation of a stable passivation film at the surface of the carbon electrode due to TOS reduction. Electrochemical impedance spectroscopy showed that a TOS addition of more than 0.5 wt% increased the cell interfacial impedance. Differential scanning calorimetry showed that the thermal stability of lithiated MCMB was also improved with the TOS addition.

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