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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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nio纳米晶的制备和电化学性能
Keywords: 无机非金属材料,氧化镍,溶胶--凝胶
Abstract:
？用溶胶-凝胶(sol-gel)工艺制备纳米nio粉体,研究了烧结温度对其结构和电化学性能的影响.结果表明,以醋酸镍、柠檬酸、乙二醇为原料通过酯化--络合过程合成的凝胶,在烧结过程中在430℃完全分解并逐渐形成nio纳米晶;随着烧结温度的升高,纳米nio粉体的结构趋于完善、晶粒尺寸逐渐增大,其电化学循环性能逐渐提高;在600℃烧结2h可得到平均粒径约为40nm、呈球形的nio纳米晶颗粒.nio纳米晶的首次和第10次充放电比容量分别高达850mah/g和\linebreak471mah/g,具有良好的容量保持率,明显优越于用固相法制备的nio粉体.
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