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以M nCO 3、N iO(H)2、Li2CO3为原料,采用固相法合成层状LiN i0.5M n0.5O2,并对其物理性能和电化学性能进行表征。X R D结果表明,在空气气氛中,700℃烧结24h合成的LiN i0.5M n0.5O2结晶不完整,900℃烧结24h则结晶完整,1000℃烧结24h则有杂质生成。SE M测试表明900℃烧结24h合成的LiNi0.5M n0.5O2有较好的表观形貌,平均粒径为500nm。700℃、800℃时合成的样品颗粒易发生团聚,1000℃时颗粒易烧结成块,均会造成较大的极化。充放电结果表明,空气气氛中900℃烧结24h合成的LiNi0.5M n0.5O2首次放电容量为160m A h/g,30次以后保持在135m A h/g。
Abstract：Layered LiMn0.5Ni0.5O2 was synthesized with MnCO3,Ni(OH)2 and Li2CO3 by solid state reaction method and the physical and electrochemical properties of the samples were studied.XRD results indicated a good crystallinity of the material prepared in air for 24h at 900℃.SEM results demonstrated the as-prepared sample has well-distributed size and smooth surface with average diameter of 500nm.Conglomeration of particles tends to happen when synthesized under lower temperature and agglomeration tends to appear when synthesized under higher temperature,which contribute to the polarization of electrode in the charge/discharge process.The LiNi0.5Mn0.5O2 electrode delivered a high discharge capacity of 160 mAh/g between 2.5V and 4.6V with a large loss of capacity in the second cycle and 135 mAh/g was retained after 30 cycles.
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基本信息:
中图分类号:TM912
引用信息:
[1]曹四海,王志兴,李新海,等.固相法制备层状LiNi_(0.5)Mn_(0.5)O_2的研究[J].电池工业,2006(03):178-181.
基金信息:
教育部回国人员科研启动基金
2006-06-25
2006-06-25