| 锂离子电池正极材料Li[Li0.2Ni0.2Mn0.6]O2的酸浸改性研究 |
| Modification of Li[Li0.2Ni0.2Mn0.6]O2 as Cathode Material for Rechargeable Lithium Batteries by Acid-Leaching |
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| 摘要: 为提高锂离子电池正极材料Li[Li0.2Ni0.2Mn0.6]O2的首次充放电效率，对固相法合成的该材料进行了酸浸的改性研究。通过X射线衍射(XRD)、扫描电子显微镜(SEM)对所得样品的结构、形貌进行了表征。结果表明，Li[Li0.2Ni0.2Mn0.6]O2经过酸处理后，首次放电效率得到了较大的提高，但是放电中值电压明显下降。其中，0.5 mol·L-1的硝酸浸泡5 h的效果最佳，首次放电效率达到了86.7%，同时放电容量达到最大值的循环次数大大减少。酸浸改性的原因被归结于材料表面出现了富锂尖晶石结构Li4Mn5O12相。 |
| 关键词: 锂离子电池 正极材料 固相法 酸浸 |
| 基金项目: |
| Abstract: In order to improve the initial discharge efficiency of Li[Li0.2Ni0.2Mn0.6]O2 as cathode material for rechargeable lithium batteries, Li[Li0.2Ni0.2Mn0.6]O2 synthesized by a solid state method was preconditioned in acids. The product was characterized by XRD and SEM. It is found that the first discharge efficiency of Li[Li0.2Ni0.2Mn0.6]O2 after acid treatment had been greatly improved, but the mid-voltage sharply decreased. The treatment with 0.5 mol·L-1 HNO3 for 5 h was the best result, the efficiency reached 86.7%, meanwhile, the discharge capacity reached maximum faster than before. The reason of acid leaching modification was attributed to the appearance of the spinel structure Li4Mn5O12 phase with rich lithium. |
| Keywords: lithium-ion battery cathode material solid state method acid leaching |
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| 杜 柯,黄 霞,杨 菲,胡国荣,彭忠东.锂离子电池正极材料Li[Li0.2Ni0.2Mn0.6]O2的酸浸改性研究[J].无机化学学报,2012,28(5):983-988. |
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