第1个回答 2013-05-16
With in-depth study oflithium ion battery,itsmany advantagesthat have beenwidely used,butitsjust passableperformance at low temperaturehas attracted a lot of attention.Lithiumion batteryworkunder the condition of low temperature,the battery capacitydecreases drastically andpolarization enhancement,at the temperature of -40 ℃,batterydischargecapacity justroomcapacity of 12%,but asa specialdefenseor spacestandby power supply,you need to usein the condition of low temperaturebelow -20 ℃.Therefore,in order to developthe cause of national defense,improve the low temperature performance ofthe lithium ion battery isnecessary.The study found,main factors affecting thelow temperatureperformance of lithium ion batteryis alithium ion diffusionin the positive and negativeelectrodesandmasstransfer impedance.Under the condition of low temperature,the lithium ionisembedded in thecathode materialand prolapse,resulting inthe reduced capacity.Theinfluencefactorsfor thelow temperature performanceoflithium ion battery,thelithium ions inthe positive and negative electrodesofthemasstransfer impedance,including thecapacityloss experimentand lowimpedance test.Through theexperimental phenomena,combined with theoretical knowledgeto analyze the cause ofthe phenomenon,the finalconclusion.