课程学术英语作业.pptx

WhyCouldYourCellphoneExplode?ChengXiaojing115020910210Dec23th,2015

True?OrAlarmist?

WhyCouldYourCellphoneExplode?

Whatdoesacellphonebatteryconsistof?Howdoesacellphonebatterywork?Whycouldacellphonebatteryexplode?

1.Components(Li+battery)Li(CF)n1.Anode–Li2.Electrolyte3.Cathode-(CF)n

2.PrincipalLiexposetoelectrolyte→reaction→Solidelectrolyteinterphase(SEI)→Li+cangothroughbute-cannot

2.Principal1.Discharging:Anode→Releasee-→CathodeAnode→Li→Li+→SEI→CathodeReactionEquation:Anode：Li→Li++e-Cathode:Li++e-→Li

2.Principal2.Charging:Anode→Gete-e-+Li+→LiLielectrodeposit（电沉积）atanode

3.ExplosionNormallyaplaneProtuberance（突起）→Newlyformedlithiumprefertoelectrodepositattheprotuberances→Protuberancedevelop→dendrite（枝晶）

3.ExplosionPlaneDendrite→DendriteLargeenough→PokeSEI→Lithiumexposedtotheelectrolyte→Violentreaction→Toomuchhot→Massexpand→Explosion.

Thecellphoneexplosionisnotalarmist.Pleasekeepyourcellphoneawaywhileitischarging.Whatdoesacellphonebatteryconsistof?Howdoesacellphonebatterywork?Whycouldacellphonebatteryexplode?

ReferencesNamKT,KimDW,YooPJ,etal.Virus-enabledsynthesisandassemblyofnanowiresforlithiumionbatteryelectrodes[J].science,2006,312(5775):885-888.ZhangS,DingMS,XuK,etal.Understandsolidelectrolyteinterfacefilmformationongraphiteelectrodes[J].ElectrochemicalandSolid-StateLetters,2001,4(12):A206-A208.EdstromK,GustafssonT,ThomasJO,Thecathode-electrolyteinterfaceintheLi-ionbattery[J].ElectrochimicaActa,2004,50(2):397-403.LeeHH,WanCC,WangYY.Thermalstabilityofthesolidelectrolyteinterfaceoncarbonelectrodesoflithiumbatteries[J].JournalofTheElectrochemicalSociety,2004,151(4):A542-A547.

Thankyou!