Preparation and electrochemical properties of Li[Ni1/3Co1/3Mn1−x/3Zrx/3]O2 cathode materials for Li-ion batteries |
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Authors: | Bin Lin Zhaoyin WenZhonghua Gu Xiaoxiong Xu |
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Affiliation: | Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China |
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Abstract: | Layer-structured Zr doped LiNi1/3Co1/3Mn1−x/3Zrx/3]O2 (0 ≤ x ≤ 0.05) were synthesized via slurry spray drying method. The powders were characterized by XRD, SEM and galvanostatic charge/discharge tests. The products remained single-phase within the range of 0 ≤ x ≤ 0.03. The charge and discharge cycling of the cells showed that Zr doping enhanced cycle life compared to the bare one, while did not cause the reduction of the discharge capacity of LiNi1/3Co1/3Mn1/3]O2. The unchanged peak shape in the differential capacity versus voltage curve suggested that the Zr had the effect to stabilize the structure during cycling. More interestingly, the rate capability was greatly improved. The sample with x = 0.01 presented a capacity of 160.2 mAh g−1 at current density of 640 mA g−1(4 C), corresponding to 92.4% of its capacity at 32 mA g−1(0.2 C). The favorable performance of the doped sample could be attributed to its increased lattice parameter. |
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Keywords: | Lithium ion battery Cathode material Li[Ni1/3Co1/3Mn1/3]O2 Zr-doping Electrochemical performance |
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