丙烯酸络合法制备锂离子电池负极材料ZnMn_2O_4

Synthesis and Electrochemical Performance of the Composite Oxide of ZnMn_2O_4 as Anode Material for Lithium Ion Battery

采用丙烯酸络合溶胶-凝胶法合成出锂离子电池用ZnMn2O4负极材料,并用TG-DTA,XRD,SEM和电化学性能测试对材料进行了表征。结果表明,在焙烧温度达到800℃,焙烧5h时能够形成单一四方相尖晶石结构的ZnMn2O4粉体,结晶良好;络合剂丙烯酸与金属离子摩尔比显著影响微观形貌,1:1时层片状结构发育完善;组装成扣式电池进行电化学测试的结果表明,丙烯酸:金属离子=1:1的样品具有较好的电化学性能,首次放电比容量达到992.9mAh·g-1,为理论比容量的98.5%,循环60次后放电比容量为308.4mAh·g-1。

Anode materials of ZnMn2O4 for Li-ion batteries were prepared using an acrylic acid assisted sol-gel method. The effects of molar ratio of acrylic acid to metal ions on the crystal structure, surface morphology and electrochemical performance of ZnMn2O4 were investigated by XRD, SEM and charge-discharge tests. The TG-DTA curves of the precursor and XRD patterns show that the sample synthesized at 800℃ for 5 h has a good crystalline I41/amd tetragonal spinel structure. The molar ratio of complexing agent acrylic to metal ion significantly affects the morphology of as-preparing ZnMn2O4 powders. The improved layered structure has developed in 1:1 of acrylic acid to metal ions. The electrochemical test demonstrates that the ZnMn2O4 synthesized at 1:1 molar ratio of acrylic acid to metal ions shows the best electrochemical performance with an initial discharge capacity of 992.9 mAh·g -1 , 98.5 % of the theoretical capacity, and retains a discharge capacity of 308.4 mAh·g -1 after 60 cycles.