| 核壳结构Ni(OH)x(x=2.01～2.15)电极材料的制备及电化学性能 |
| Preparation and Electrochemical Performance of Ni(OH)x(x=2.01～2.15) Electrode Material with Core/shell Structure |
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| 摘要: 采用化学氧化法制备了碱性二次电池用正极材料Ni(OH)x。采用SEM、TEM、XRD等手段表征了样品的形貌及物相特征，测定了样品的平均氧化态，并考察了其作为镍氢电池正极活性材料的电化学性能。结果表明：经过氧化处理的球形Ni(OH)2表面形成了β-NiOOH，呈现出明显的核壳式结构，制备的样品中Ni的平均氧化态分别为：2.01、2.05、2.13，nNi3+/nNi介于1%～15%之间，以制备的样品为正极材料组装成镍氢模拟电池在0.2C倍率下充放电，样品的放电容量为275±10 mAh·g-1；1C充放电条件下，Ni平均氧化态为2.05的样品首次放电容量为268 mAh·g-1，270次循环后容量保持率为98%。 |
| 关键词: Ni(OH)x 核壳式结构 Ni/MH电池 电化学性能 |
| 基金项目: |
| Abstract: The positive active materials Ni(OH)x(x=2.01～2.15) for Ni-based rechargeable alkaline batteries were prepared through a simple route of chemical oxidation. The samples were characterized by XRD, SEM, TEM and TG/DSC. Average Ni oxidation state(OS) of the sample and the electrochemical performance were investigated, respectively. Results show that a core/shell structure is formed with the β-NiOOH coating outside after the surface modification. OS of the different samples are 2.01, 2.05, 2.13， respectively, with the nNi3+/nNi of 1%～15%. The Ni/MH battery simulators with the above treated samples as positive active material show the discharge capacity of 275±10 mAh·g-1 under 0.2C charge/discharge rate, a first discharge capacity of 268 mAh·g-1 with a capacity maintenance of 98% after 270 cycles under 1C charge/discharge rate for the sample with the average Ni OS of 2.05. |
| Keywords: Ni(OH)x core/shell structure Ni/MH battery electrochemical performance |
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| 仲晓玲,黄可龙,刘素琴,李亚娟,陈东洋.核壳结构Ni(OH)x(x=2.01～2.15)电极材料的制备及电化学性能[J].无机化学学报,2009,25(1):19-25. |
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