| 前驱体Ni(OH)2对LiCo0.3Ni0.7O2正极材料的影响研究 |
| Effect of Precursor Ni(OH)2 on Structure and Properties of LiCo0.3Ni0.7O2 for Rechargeable Lithium Batteries |
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| 摘要: 研究了两种不同前驱体Ni(OH)2对LiCo0.3Ni0.7O2锂离子电池正极材料的结构与电化学性能的影响，并用XRD、SEM及电性能测试考察了材料的结构、形貌与电化学性能。结果表明，前驱体Ni(OH)2的形貌、结晶形态对LiCo0.3Ni0.7O2正极材料的性能有极大的影响。与目前镍酸锂合成需高密度球形镍前驱体Ni(OH)2认识不同，本文发现呈枝晶网络状结构、表面蓬松、比表面积高和振实密度低的前驱体Ni(OH)2具有较高的化学活性，可有效抑制产物LiCo0.3Ni0.7O2正极材料中阳离子混排产物的生成。由其制备的目标正极材料LiCo0.3Ni0.7O2显示出较优的电化学性能，首次放电容量为175 mAh·g-1，首次放电效率为93.9%，40次循环容量保持率为94.8%，显示较好的循环稳定性。 |
| 关键词: 锂离子电池 正极材料 LiCo0.3Ni0.7O2 前驱体 |
| 基金项目: |
| Abstract: A layered LiCo0.3Ni0.7O2 cathode material with high cyclic stability for lithium ion batteries has been synthesized using the Ni(OH)2 prepared by our own. The influence of Ni(OH)2 precursor on the structure and electrochemical properties of the materials has been investigated. XRD, SEM and electrochemical tests have been used to study the physical and the electrochemical performances of the materials. The results show that the Ni(OH)2, prepared by our own ,which has much crystal deficiency, fluffy and dendritic morphology, high specific surface area and low tap density, is a better kind of precursors to prepare LiCo0.3Ni0.7O2, compared with the high density and spherical particle Ni(OH)2 precursor. The sample LiCo0.3Ni0.7O2 prepared by self made precursor has an initial charge capacity of 175 mAh·g-1 and an initial efficiency of 93.9%. After 40 cycles, this sample remains 167 mAh·g-1 of discharge capacity and the loss ratio of capacity is just 5.2%. |
| Keywords: lithium-ion battery cathode material LiCo0.3Ni0.7O2 precursor |
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| 许惠,钟辉.前驱体Ni(OH)2对LiCo0.3Ni0.7O2正极材料的影响研究[J].无机化学学报,2006,22(10):1761-1765. |
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