Citation:
DU Ke, HUANG Jin-Long, HU Guo-Rong, PENG Zhong-Dong, CAO Yan-Bing, TANG Cao-Pu, WANG Wei-Gang. Research on Synthesis and Performance of Composite Cathode Material Li[Ni0.92Co0.04Mn0.04]O2 with Gradient-Coating Layer as Lithium Ion Battery[J]. Chinese Journal of Inorganic Chemistry,
;2013, 29(5): 1031-1036.
doi:
10.3969/j.issn.1001-4861.2013.00.142
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A new core-shell structure precursor were prepared by a co-precipitation method. A gradient concentration of Ni-Co-Mn shell layer was co-precipitated on the Ni(OH)2 core which was used as the precursor. Then, the well-ordered spherical LiNi0.92Co0.04Mn0.04O2 was synthesized by sintering the mixture of as-prepared precursor and LiOH·H2O in O2. The prepared samples were characterized by X-ray diffractometry, SEM and galvanostatic charge-discharge test. The results show that, the product has a layered hexagonal α-NaFeO2 structure and a spherical morphology. The line scan test of elements on the cross section area of coating shell show that the main elements of the materials change gradiently. The initial discharge capacity is 193.8 mAh·g-1 at 0.1C rate between 2.8 and 4.3 V and retains 96.8% after 40 cycles at 25 ℃. The capacity at 1C and 2C is 175 mAh·g-1 and 165.1 mAh·g-1. When cycled at 55 ℃, the initial discharge capacity is 236.1 mAh·g-1 and retains 77.5% after 40 cycles, indicating good electrochemical capacity and cycling stability.
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