柠檬酸(铵)处理对Li[Li0.2Mn0.54Ni0.13Co0.13]O2电化学性能影响的研究

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[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂电化学性能影响的研究[J]. 无机化学学报, 2013, 29(4): 786-792. doi: 10.3969/j.issn.1001-4861.2013.00.139 shu

Citation: DU Ke, YANG Fei, HU Guo-Rong, PENG Zhong-Dong, CAO Yan-Bing. Studies on the Effects from Citric Acid and Ammonium Citrate Tribasic Treatment on Electrochemical Performance of Li[Li_0.2Mn_0.54Ni_0.13 Co_0.13]O₂[J]. Chinese Journal of Inorganic Chemistry, 2013, 29(4): 786-792. doi: 10.3969/j.issn.1001-4861.2013.00.139 shu

柠檬酸(铵)处理对Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂电化学性能影响的研究

摘要: 以共沉淀法制备的[Mn_0.54Ni_0.13Co_0.13]_1.25CO₃为前驱体, 配锂焙烧获得了富锂锰基固溶体Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]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[Li_0.2Mn_0.54Ni_0.13Co_0.13]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

English

Studies on the Effects from Citric Acid and Ammonium Citrate Tribasic Treatment on Electrochemical Performance of Li[Li_0.2Mn_0.54Ni_0.13 Co_0.13]O₂

1.
College of Metallurgical Science and Engineering, Central South University, Changsha 410083, China
Received Date: 01 November 2012

Abstract: In order to improve the initial charge/discharge efficiency and rate performance of Li[Li_0.2Co_0.13Ni_0.13Mn_0.54]O₂, we used citric acid and ammonium citrate tribasic to treat the materiel Li[Li_0.2Co_0.13Ni_0.13Mn_0.54]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.

Key words:

manganese based solid solution;surface modification;irreversible capacity loss

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

柠檬酸(铵)处理对Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂电化学性能影响的研究

English

Studies on the Effects from Citric Acid and Ammonium Citrate Tribasic Treatment on Electrochemical Performance of Li[Li_0.2Mn_0.54Ni_0.13 Co_0.13]O₂

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