Abstract
The capacity loss of spinel LiMn2O4 cathode at elevated temperatures was evaluated by constant current charge_discharge methods and it was found that serious capacity loss and cycleability decrease occured at above 50 , especially for the charged cells. The mechanisms for this phenomena were examined by atomic emission and infrared spectrometry of the electrolyte, XRD measurment of the cycled elecrode and microelectrode voltammetry of LiMn2O4 at room and elevated temperatures. The results showed that with increasing temperature, Mn and Li ions tended to redistribute partly in the spinel framework due to the disproportion of Mn3+ ions and this results in a rapid increase in Mn dissolution and a catalytic decomposition of the electrolyte. All these factors combiningly play a dominated action for the observed capacity fading of LiMn2O4 electrode.
Keywords
LiMn2O4, Capacity loss, Higher temperature
Publication Date
1999-05-28
Online Available Date
1999-05-28
Revised Date
1999-05-28
Received Date
1999-05-28
Recommended Citation
Xiaohong Hu, Hanxi Yang, Xinping Ai, Shengxian Li, Xinlin Hong.
The Behaviors of Capacity Loss of LiMn2O4 Cathodeat Elevated Temperatures[J]. Journal of Electrochemistry,
1999
,
5(2): Article 17.
DOI: 10.61558/2993-074X.3180
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol5/iss2/17
References
1JarasconJM，MckinnonWR，CoowarFetal．SynthesisconditionsandoxygenstoichimetryefectsonLiinsertionintothespinelLiMn2O4．J．Electrohcem．Soc．，1994，141：14212GaoYuan，DahnJR．SynthesisandcharacterizationofLi1＋xMn2－xO4forLionbateryapplications．J．Electrochem．Soc．，1996，143：1003HuXH，AiXP，YangHXetal．AstudyofLiMn2O4synthesizedfromLi2CO3andMnCO3．J．PowerSources，1998，74：2404TarasconJM，GuyomardD．TheLi1＋xMn2－xO4／Crocking＿chairsystem：Areview．ElectrochimicaActa，1993，38：12215XiaYongyao，ZhouYunHong，MasakiYoshio．Capacityfadingoncyclingof4VLi／LiMn2O4cels．J．Electrochem．Soc．，1997，144：25936GuyomardD，TarasconJM．RechargeableLi1＋xMn2O4／carboncelswithanewelectrolytecomposition．J．Electrochem．Soc．，1993，140：30717DongH．Jang，YoungJ．Shin，SeungM．Oh，DisolutionofSpinelOxidesandCapacitylosesin4VLi1＋xMn2O4Cels．J．Electrochem．Soc．，1996，143：22048MegahedS，ScrosatiB．Lithium＿ionRechargeableBateries．J．Power．Source，1994，51：799TakeiT，KozawaA，MostevRV．实质性改进锂原电池和锂离子蓄电池性能的超精细碳胶体的应用．电池信息快讯，1997，4：2410WangBaochen，XiaYongyao，fengLietal．StudiesofSpinelLiCrxMn2－xO4forSecondaryLithiumBatery，J．PowerSources，1993，43～44：53911LiGuohua，IkutaH，UchidaTetal．TheSpinelPhasesLiMyMn2－yO4（M＝Co，Cr，Ni）astheCathodeforRechargeableLithiumBateries．J．Electrochem．Soc．，1996，143：178
Included in
Materials Chemistry Commons, Materials Science and Engineering Commons, Physical Chemistry Commons, Power and Energy Commons
