College of Chemistry & Chemical Engineering, Shaoxing University , Shaoxing 312000, People's Republic of China.
Mathematic Information College, Shaoxing University , Shaoxing 312000, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Apr 12;9(14):12408-12415. doi: 10.1021/acsami.6b16741. Epub 2017 Mar 30.
LiNiCoMnO (NCM) is regarded as a promising material for next-generation lithium ion batteries due to the high capacity, but its practical applications are limited by the poor electronic conductivity. Here, a one-step method is used to prepare carbon coated LiNiCoMnO (NCM/C) by applying active carbon as reaction matrix. TEM shows LiNiCoMnO particles are homogeneously coated by carbon with a thickness about 10 nm. NCM/C delivers the discharge capacity of 191.2 mAh g at 0.5 C (85 mA g) with a columbic efficiency of 91.1%. At 40 C (6800 mA g), the discharge capacity of NCM/C is 54.6 mAh g, whereas NCM prepared through sol-gel route only delivers 13.2 mAh g. After 100 charge and discharge cycles at 1 C (170 mA g) the capacity retention is 90.3% for NCM/C, whereas it is only 72.4% for NCM. The superior charge/discharge performance of NCM/C owes much to the carbon coating layer, which is not only helpful to increase the electronic conductivity but also contributive to inhibit the side reactions between LiNiCoMnO and the liquid electrolyte.
镍钴锰酸锂（NCM）因其高容量而被认为是下一代锂离子电池的有前途的材料，但由于电子电导率差，其实际应用受到限制。在这里，采用一步法，通过将活性炭用作反应基质来制备碳涂层 LiNiCoMnO（NCM/C）。TEM 显示 LiNiCoMnO 颗粒均匀地被厚度约为 10nm 的碳所包覆。NCM/C 在 0.5 C（85 mA g）下的放电容量为 191.2 mAh g，库仑效率为 91.1%。在 40 C（6800 mA g）下，NCM/C 的放电容量为 54.6 mAh g，而通过溶胶-凝胶法制备的 NCM 仅为 13.2 mAh g。在 1 C（170 mA g）下进行 100 次充放电循环后，NCM/C 的容量保持率为 90.3%，而 NCM 的容量保持率仅为 72.4%。NCM/C 的优异的充放电性能很大程度上归因于碳涂层，其不仅有助于提高电子电导率，而且有助于抑制 LiNiCoMnO 与液态电解质之间的副反应。
