首页|Mechanisms for different cyclabilities of commercial LiCoO2/artificial graphite pouch cells at-10,0,and 25℃
Mechanisms for different cyclabilities of commercial LiCoO2/artificial graphite pouch cells at-10,0,and 25℃
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Although a few studies reveal the reasons of poor charge-discharge abilities for lithium-ion batteries based on LiNixMnyCo1-x-yO2 at low temperature,there are still some practical issues worthy of further investigation.For instance,how the side reactions affect the cyclabilities of commercial LiCoO2/artificial graphite(LCO/AG)cells at different low temperatures,and are the synergistic effects between the side reactions similar to that at room temperature?To answer the issues,the performances of a～3 Ah LCO/AG pouch cell at different temperatures and C-rates are studied.Results illustrate that the obvious in-crease in charge transferring impedance especially in AG anode at low temperature causes large po-larization,then reducing charge-discharge ability and even yielding lithium deposition at-10℃ and 0.5C under 3-4.45 V.Different from at room temperature,the side reactions such as electrolyte decomposition and electrode structural evolution reduce significantly at low temperature,which contribute to an excellent cyclability after 500 cycles at 0℃.Instead,a series of chain reactions cause a relative lower cyclability at 25℃.Lithium deposition is slight after 5 cycles at-10℃,but become considerably severe after 20 cycles and cause rollover failure of capacity.All these results deepen the understanding on mechanisms for different behaviors of LCO/AG cells at low temperature and provide optimization direction.
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