| 柠檬酸(铵)处理对Li[Li0.2Mn0.54Ni0.13Co0.13]O2电化学性能影响的研究 |
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| 引用本文： | 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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| 作者姓名： | 杜柯 杨菲 胡国荣 彭忠东 曹雁冰 |
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| 作者单位： | 中南大学冶金科学与工程学院, 长沙 410083;中南大学冶金科学与工程学院, 长沙 410083;中南大学冶金科学与工程学院, 长沙 410083;中南大学冶金科学与工程学院, 长沙 410083;中南大学冶金科学与工程学院, 长沙 410083 |
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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179.5mAh.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。
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| 关 键 词： | 富锂锰基固溶体 表面改性 首次不可逆容量 |
| 收稿时间： | 2012-11-01 |
| 修稿时间： | 2012-12-27 |
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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| DU Ke,YANG Fei,HU Guo-Rong,PENG Zhong-Dong and CAO Yan-Bing. Studies on the Effects from Citric Acid and Ammonium Citrate Tribasic Treatment on Electrochemical Performance of Li[Li0.2Mn0.54Ni0.13 Co0.13]O2[J]. Chinese Journal of Inorganic Chemistry, 2013, 29(4): 786-792 |
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| Authors: | DU Ke YANG Fei HU Guo-Rong PENG Zhong-Dong CAO Yan-Bing |
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| Affiliation: | College of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;College of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;College of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;College of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;College of Metallurgical Science and Engineering, Central South University, Changsha 410083, China |
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| 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. |
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| Keywords: | manganese based solid solution surface modification irreversible capacity loss |
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