应用钴、镍金属并联电解法制备锂离子电池正极材料.电解反应时,调节流过钴、镍电极上的电流比值及控制合适的电流密度,可生成均匀的CoxNi1-x(OH)2前驱体.研究表明,该法简单且无污染.合成的LiCo0.3Ni0.7O2正极材料充放电的容量较高,循环稳定性也较好,其初始放电容量为163mAh/g,经过50次充放电循环后放电容量仍可保持140mAh/g.
魏进平
,
孙欣
,
王晓宇
,
卞锡奎
,
翟金玲
. 金属并联电解制备LiCo_xNi_(1-x)O_2正极材料[J]. 电化学, 2004
, 10(4)
: 409
-414
.
DOI: 10.61558/2993-074X.1594
A new electrolytic method was developed to prepare LiCo_(x)Ni_(1-x)O_2 as a cathode material of lithium-ion battery. Contrary to the traditional method, electrolytic method is a potential method with simple process to industrialization and no pollution. Metal cobalt and nickel were electrolysed in parallel to prepare the precursor of Co_( x )Ni_(1- x )(OH)_2.Different compositional precursors could be conveniently prepared by changing electrolytic current. The LiCo_(0.3)Ni_(0.7)O_2 cathode prepared by this method was found favorable charge-discharge and cycle properties. For the LiCo_(0.3)Ni_(0.7)O_(2 )cathode material, the discharge capacities in the 1st and 50th cycles were 163 mAh/g and 140 mAh/g with charge retention of 86%.
[1] ScrosatiB.Challengeofportablepower[J],Nature,1995,373:557~558.
[2] KoksbangR,BarkerJ,ShiH,etal.Cathodematerialsforlithiumrockingchairbatteries,Solidstateionics[J].1996,84:1~21.
[3] OhzukuT,UedoA,NagayamaM.ElectrochemistryandstructuralchemistryofLiNiO2(R3m)for4voltsecondarylithiumcells[J].J.Electrochem.Soc.,1993,140(7):1862.
[4] RitehieAG,GiwaCO,LeeJC,etal.Futurecathodematerialsforlithiumrechargeablebatteries[J].J.PowerSources,1999,80:98~102.
[5] GaoY,YakovlevaMV,EbnerWB.NovelLiNi1$CxTix/2Mgx/2O2compoundsascathodematerialsfordaferlithium ionbatteries[J].Electrochem.Solid StateLett.,1998,1:117~119.
[6] Weijinping,Dengpin,Yanjie,etal.Anewtechniqueforpreparationofthecathodematerialoflithium ionbattery[J].ChemicalJournalofChineseUniversity,22(10):9~12.
[7] Weijinping,Xiaxiaoyong,Panguiling,etal.PreparationofLiCo0.2Ni0.8O2byelectrolysisofCo0.2Ni0.8alloy[J].BatteryBimonthly,2002,32(S1):53~55.
[8] Xiaxiaoyong,Weijinping,Yemao,etal.PreparationofcathodematerialsLiCoxNi1-xO2(x=0.2,0.5,0.8)forlithiumionbatterybyelectrolysis[J].ChineseJournalofAppliedChemistry,2003,20(10):928~931.
[9] Yanjie,Weijinping,Xiaxiaoyong.Preperationofcathodematerialsforlithiumionbatteny[P].CN02123800.6,2002 06 28.
[10]FeyGTK,ChemJG,SubramanianV,etal.PreparationandelectrochemicalpropertiesofZn dopedLiNi0.8Co0.2O2[J].J.PowerSources,2002,112:384.
[11]ReimersJN,RossenE,JonesCD,etal.StructureandelectrochemistryofLixFeyNi1-yO2[J].SolidStateIoincs,1993,61:335.
[12]ChoJ,KimG,LimHS.EffectofpreparationmethodsofLiNi1$CxCoxO2cathodematerialsontheirchemicalstructureandelectrodeperformance[J].J.Electrochem.Soc.,1999,146(10):3571~3576.