以 Ni (CH3 COO )2·4H2 O 和 Mn (CH3 COO)2·4H2 O 为原料,分别在400、500℃分解3、7h 得到镍锰复合氧化物前驱体,再与锂源 Li2 CO3混匀,在800℃煅烧12h,600℃退火24h 得到LiNi0.5 Mn1.5 O4正极材料。XRD、SEM、EIS 和恒流充放电测试结果表明,在400℃、7h 制备的前驱体与Li2 CO3合成的 LiNi0.5 Mn1.5 O4性能最佳。室温下以0.1C 倍率充放电,首次放电比容量达到141.5mAh/g,循环30次后容量保持率为98.55%；以1C 倍率充放电,首次放电比容量为120.34mAh/g,循环30次后放电比容量为112.09mAh/g。
LiNi0.5Mn1.5O4 cathode materials were synthesized by solid state method using Ni(CH3COO)2 · 4H2 O,Mn(CH3 COO)2 ·4H2 O as starting materials,then decomposed to get nickel manganese oxides at 400 and 500℃ for 3 or 7h,joined and mixed the source of lithium Li2 CO3 .The sample was calcined in air at 800℃for 12h and then annealed at 600℃ for 24h.XRD,SEM,EIS and charge-discharge performance tests showed that LiNi0.5 Mn1.5 O4 delivered the best electrochemical performance by used precursor made at 400℃ for 7h.Its initial specific discharge capacity was 141.5mAh/g when 0.1C charge-discharge at room temperature,and after 30 cycles the capacity retention was 98.59%;when charged-discharged at 1C initial capacity was 120.34mAh/g, and after 30 cycles the capacity was 112.09mAh/g.
参考文献
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