| 柠檬酸(铵)处理对Li[Li0.2Mn0.54Ni0.13Co0.13]O2电化学性能影响的研究 |
| Studies on the Effects from Citric Acid and Ammonium Citrate Tribasic Treatment on Electrochemical Performance of Li[Li0.2Mn0.54Ni0.13 Co0.13]O2 |
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| 摘要: 以共沉淀法制备的[Mn0.54Ni0.13Co0.13]1.25CO3为前驱体, 配锂焙烧获得了富锂锰基固溶体Li[Li0.2Mn0.54Ni0.13Co0.13]O2, 然后分别用柠檬酸、柠檬酸三铵对该材料进行表面预处理。结果表明经柠檬酸(铵)处理后, Li[Li0.2Mn0.54Ni0.13Co0.13]O2中分别有16.37wt%和13.14wt%的锂被化学脱出。充放电测试结果表明, 表面处理后的样品首次效率有了较大的提高(由63.5%分别提高到了80.2%和80.7%), 0.2C循环40次容量保持率分别由91.43%提高到97.42%和92.72%, 1C容量由处理前的149.5 mAh·g-1提高到179.5 mAh·g-1和181.5 mAh·g-1, 表明处理后材料的循环性能和倍率性能都得到了改善。这主要是由于柠檬酸(铵)处理, 预先脱出了Li2MnO3组分中的部分Li2O, 并在材料表面生成了类尖晶石结构的材料。 |
| 关键词: 富锂锰基固溶体 表面改性 首次不可逆容量 |
| 基金项目: |
| Abstract: In order to improve the initial charge/discharge efficiency and rate performance of Li[Li0.2Co0.13Ni0.13Mn0.54]O2, we used citric acid and ammonium citrate tribasic to treat the materiel Li[Li0.2Co0.13Ni0.13Mn0.54]O2, which was synthesized by carbonation co-precipitated method. After surface modification, Emission Spectrometer (ICP-AES) analysis showed that lithium is the major element of the filtrate, 16.37wt% and 13.14wt% of lithium elements dissolved out during the pretreatment stage respectively, and a small amount of transition metals desorpted in this process. The charging/discharging test revealed that the materials treated by 20% of citric acid and ammonium citrate tribasic performed higher initial efficiency (80.2% and 80.7%), After 40 cycles with 0.2C cycle, the capacity retention rate increased to 97.42% and 92.70% from 91.43%, and the capacity at 1C increased to 179.5 mAh·g-1, 181.5 mAh·g-1, respectively. The results showed that after the treatment of citric acid and ammonium citrate tribasic, material properties and the rate performance were both improved. |
| Keywords: manganese based solid solution surface modification irreversible capacity loss |
| 投稿时间：2012-11-01 修订日期：2012-12-27 |
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| 杜柯,杨菲,胡国荣,彭忠东,曹雁冰.柠檬酸(铵)处理对Li[Li0.2Mn0.54Ni0.13Co0.13]O2电化学性能影响的研究[J].无机化学学报,2013,29(4):786-792. |
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