| Co-B合金粉体的制备和电化学行为 |
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| 引用本文： | 吕东生,李伟善,谭春林,曾荣华.Co-B合金粉体的制备和电化学行为[J].金属学报,2010(3). |
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| 作者姓名： | 吕东生 李伟善 谭春林 曾荣华 |
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| 作者单位： | 华南师范大学化学与环境学院;广东省高等学校电化学储能和发电技术重点实验室; |
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| 基金项目： | 广东省高校优秀青年教师培养计划(育苗工程)资助项目~~ |
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| 摘 要： | 通过NaBH_4还原CoSO_4溶液制备了Co_(0.68)B_(0.32),Co_(0.55)B_(0.45)和Co_(0.50)B_(0.50)一系列超细非晶态Co-B合金粉体.电化学测试表明,在300 mA/g的高电流密度下,3种合金电极的首次放电容量分别高达510.6,666.4和667.2 mA·h/g,经60次循环后,放电容量仍分别有331.6,379.5和390.5 mA·h/g.3种合金电极还表现出良好的高率放电性能,在1200 mA/g的放电电流密度下,放电容量分别为336.2,373.4和390.1 mA·h/g.较高的B含量有助于提高合金的电化学性能,这是因为B的氧化溶解能提高合金电极的实际电化学反应面积.
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| 关 键 词： | Co-B合金 非晶粉体 化学还原 电化学性能 |
PREPARATION AND ELECTROCHEMICAL BEHAVIORS OF Co-B ALLOY POWDERS |
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| Abstract: | Alkaline rechargeable batteries,such as Ni/Cd batteries and Ni/MH batteries have been widely used as power sources,however,their further applications are limited due to contamination of Cd in Ni/Cd batteries and lower discharge capacities of Ni/MH batteries.Some metal borides, such as Co-B,Ni-B,Fe-B,V-B and Ti-B,have been known to own very high discharge capacity in alkaline aqueous solution,in which Co-B alloy exhibits the highest reversible discharge capacity and the best cyclic stability.However,the reve... |
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| Keywords: | Co-B alloy amorphous powder chemical reduction electrochemical property |
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