新型锂离子电池三维结构泡沫NiO电极的制备及电化学性能

Preparation and Electrochemical Performance of Novel Three-Dimensional Structured NiO Foam Electrodes for Lithium-Ion Batteries

通过固相氧化方法,以三维结构泡沫镍为基体和金属镍源,制备了三维结构泡沫氧化镍负极。XRD和SEM结果表明,经500℃氧化处理,泡沫镍基体上形成了NiO微米级的致密活性氧化层。通过充放电测试和循环伏安测试研究了电极的电化学性能,结果表明,三维结构泡沫氧化镍在放电电位区间0.05～3.2VvsLi/Li+,0.2C倍率下充放电,初始容量损失为20%,且经40次循环后,质量比容量为950mAh·g-1,三维泡沫氧化镍电极具有优异的循环容量保持性能。三维泡沫氧化镍具有的大的活性表面积,降低了界面反应的极化,从而提高了NiO电极的倍率放电性能。

Three-dimensional structured foam NiO anode was prepared by solid phase oxidation method with Ni foam as substrate and metal nickel sources. XRD and SEM results show that NiO film was prepared on foam Ni substrate by oxidized in air at 500 ℃ , and NiO film was micrometer-size dense thin film. Electrochemical performance of as-prepared three-dimensional foam NiO was evaluated by galvanostatic cycling and cyclic voltammetry. The results show that the initial capacity was 20% and a high capacity of 950 mAh·g-1 （at 0.2C rate） was obtained, with excellent capacity retention of up to 40 cycles, when cycled in the range 0.05～3.2 V vs Li/Li＋. The excellent high-rate discharge performance of three-dimensional foam NiO can be attributed to its large surface area which lowered the interface reaction polarization.