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研究论文

LiAl_yNi_(1-y)O_2作为锂离子电池正极材料的研究

  • 李晓干 ,
  • 仇卫华 ,
  • 林传刚 ,
  • 刘庆国
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  • 北京科技大学材料学院固体电解质研究室!北京100083,北京科技大学材料学院固体电解质研究室!北京100083,北京科技大学材料学院固体电解质研究室!北京100083,北京科技大学材料学院固体电解质研究室!北京100083

收稿日期: 2000-08-28

  修回日期: 2000-08-28

  网络出版日期: 2000-08-28

Studies of the LiAl_yNi_(1-y)O_2 as Cathode Materials for Rechargeable Lithium Ion Batteries

  • LI Xiao_gan ,
  • QIU Wei_hua ,
  • LIN Chuan_gang ,
  • LIU Qing_guo
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  • (Lab. for Solid State Ionics, Material Sci. Coll. of Univ. of Sci. & Techn., Beijing 100083, China

Received date: 2000-08-28

  Revised date: 2000-08-28

  Online published: 2000-08-28

摘要

本文采用固相反应法合成了一系列不同 y值的LiAlyNi1- yO2 材料 ,通过对其电化学性能的研究发现 ,在适当的烧结条件下 ,LixAl0 .2 5 Ni0 .75 O2 作为二次锂离子电池的正极材料 ,其耐过充性和循环性能都有明显改善 .当Li含量大于 1时 ,在高电位范围充放 (3- 4 .8V) 30次循环后仍保持着首次放电容量的 95 % ,而LiNiO2 在此电压范围内经 2 0次循环后却只有首次放电容量的 5 6 % .通过循环伏安实验表明 :性能改善的主要原因可能是由于充电过程中 ,Al3+ 的掺杂阻止了LixAl0 .2 5Ni0 .75 O2 随Li+ 离子过量脱出而发生晶型转变 .

本文引用格式

李晓干 , 仇卫华 , 林传刚 , 刘庆国 . LiAl_yNi_(1-y)O_2作为锂离子电池正极材料的研究[J]. 电化学, 2000 , 6(3) : 357 -357 . DOI: 10.61558/2993-074X.1398

Abstract

In this paper, we have synthesized series of single_phase LiAl yNi 1-y O 2 (differentive in value_y) by solid reaction. Through examining their electrothemical properties, found that, under a proper sintering condition, Li xAl 0.25 Ni 0.75 O 2 solution for cathode materials of rechargeable lithium ion batteries showed more pleasing properties in overcharge_resist and cycling life ( vs LiNiO 2). When x>1, the capacity can be kept 125mAh/g after 30 cycles under higher charged/discharged voltages ranging from 3.0 V to 4.8 V, whereas that of pure LiNiO 2 has only 61 nAh/g after 25 cycles. The results of CV for LiAl yNi 1-y O 2 and pure LiNiO 2 showed that this may be due to the Al 3+ doping and by preventing Li + from overcharging, Al 3+ conbined with Li + obviated the phase transmission during charged/discharged progress.

参考文献

[1 ] Yangwensheng .Synthesisandelectrochemicalstudiesofcathodematerialsforrechargeablelithiumionbatter ies[D].Beijing :UniversityofScienceandTechnology . [2 ] DelmasC ,PeresJP ,RougierA ,etal.OnthebehavioroftheLiNiO2 system :anelectrochemicalandstruc turaloverview[J].JournalofPowerSources 1 997,6 8:1 2 0~ 2 5 . [3] TsutomuOhzuku ,AtsushiUeda ,andMasaruKouguchi.SynthesisandCharacterizationofLiAL1/ 4Ni3/ 4O2forLithiumIon (shuttlecock)batteries[J].J .Electrochem .Soc .,1 995 ,1 42 (1 2 ) :   [4 ] FujitaY ,AmineK ,MarutaJ ,etal.LiNi1-xCoxO2 perparedatlowtemperatureusingβ_Ni1-xCoxOOHandeitherLiNiO3ofLiOH[J].JournalofPowerSources 1 997,6 8:1 2 6~ 1 30 . [5 ] TsutomuOhzuku ,TakayukiYanagawa ,MasaruKouguchi,etal.InnovativeinsertionmaterialofLiAL1/ 4Ni3/ 4O2 (R3m)forlithium_ion (shuttleclock)batteries[J].JournalofPowerSources 1 997,6 8:1 31~ 1 34. [6 ] NeudeckerB .J .,ZuhrR .A .,KwakB .S .,etal.LithiumManganeseNickelOxidesLix(MnyNi1-y) 2 -xO2[J].J .Electrochem .Soc .,1 998,1 45 (1 2 ) :   [7] KuboK ,FujiwaraM ,YamadaS ,etal.SynthesisandelectrochemicalpropertiesforLiNiO2 substitutedbyotherelements[J].JournalofPowerSources 1 997,6 8:5 5 3~ 5 5 7.
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