摘要
以溶胶-凝胶法制备氯阴离子掺杂型正极材料LiNi1/3Co1/3Mn1/3O2-xClx(x=0、0.05、0.10和0.15)。用TG/DTG测试分析了材料的相形成过程。XRD分析结果表明:在空气气氛中以850℃煅烧20 h制备的材料,具有良好的六方单相层状结构。电化学性能测试结果表明:掺杂抑制了高电压区域的相变过程,提高了材料的可逆性;x=0.10的样品具有良好的循环性能和倍率性能,在2.0～4.6 V循环,0.15C、1.00C首次放电比容量分别为198.7 mAh/g、166.4 mAh/g,第25次0.15C循环的放电比容量为197.9 mAh/g。
Chlorine anion doped LiNi1/3 CO1/3 M nl/3 02-x Clx （ x = 0,0.05,0.10 and 0.15） cathode materials were synthesized by sol-gel method. The phase formation process was analyzed by TG/DTG test. XRD analysis showed that all the material with single phase of hexagonal could be obtained at calcining temperature of 850 ℃ for 20 h in air atmosphere. Electrochemical performance test results showed that structural transition at high-voltage region was suppressed by doping, the reversibility of the material was enhanced. The sample with x = 0, 10 had better cycle stability and rate performance, when cycled in 2.0 - 4.6 V, the 0.15 C, 1.00 C initial specific discharge capacity was 198.7 mAh/g and 166.4 mAh/g, respectively, the specific discharge capacity was 197.9 mAh/g in the 25th cycle at 0.15 C.
出处
《电池》
CAS
CSCD
北大核心
2013年第1期31-34,共4页
Battery Bimonthly
关键词
锂离子电池
正极材料
掺杂
电化学性能
Li-ion battery
cathode material
doping
electrochemical performance
