摘要
采用ＸＲＤ和ＡＡＲ分析技术，研究了ＬｉＣｏＯ＿２电极在充电过程、放电过程以及充放电循环过程中晶胞参数变化规律．发现在这些过程中，ＬｉＣｏＯ＿２晶胞出现规律性的收缩和膨胀；过充电时产物Ｃｏ＿３Ｏ＿４，导致Ｌｉ＿ｘＣｏＯ＿２晶格的破坏；循环过程中晶胞参数Ｃ＿０值的变化与充电过程相似．各种状态下００６峰的变化最敏感．于７００℃预热２０ｈ后再高温合成的Ｌｉ＿ｘＣｏＯ＿２，其００６峰得到明显的加强，其循环伏安曲线可逆性很好，第１０００次几乎与第一次相同，实验电池１００％ＤＯＤ循环大于２７０次，ＡＡ型锂蓄电池或ＡＡ型锂离子蓄电地实验在进行中．
The Variations of crystal lattice parameters of Li_xCoO_2 during charge anddischarge have been st ud ied by XRD and AAR spectroscopy.It was found that the Li_xCoO_2 crystalvolume expanded during charge and contracted during discharge.The crystal lattice structure wasbroken because of the formation of Co_3O_4 when deeply charge.The variation of lattice parameter C_0value in cycling process was similar to that in charge process.The variation of 006 peak was the mostsensitive in every case.In case of preheating for 20 hours at 700℃ before operating hightemperature,the 006 peak obtained an enhancement obviously.It has had the good rechargeability inmeasurement of the cyclic voltammograms,the CV curve at 1000th was same as that of first one.This material could have cvcled more than 270 times at 100% DOD.The AA size cells ofrechargeable lithium battery and Li-Ion battery both are being tested now.
出处
《电化学》
CAS
CSCD
1995年第1期70-77,共8页
Journal of Electrochemistry
