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Core-shell structured Li[(Ni0.9Co0.05Al0.05)0.6(Ni0.4Co0.2Mn0.4)0.4]O2 cathode material for high-energy lithium ion batteries

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Abstract

A layer of Ni0.4Co0.2Mn0.4(OH)2 precursor was uniformly deposited on the surface of Ni0.9Co0.05Al0.05(OH)2 particles through a controlled crystallization method. The resulting particles were then homogeneously mixed with LiOH·H2O and subjected to high-temperature calcination at 800 °C under flowing oxygen to yield layered core-shell cathode material Li[(Ni0.9Co0.05Al0.05)0.6(Ni0.4Co0.2Mn0.4)0.4]O2. The elemental compositions in Ni, Co, and Mn of both the core and outer layer of the particles were analyzed by energy dispersive X-ray spectroscopy (EDX), and the data suggested that the core was rich in Ni and the shell in Mn. The shell thickness was estimated to nearly 1 μm, and the average composition of the prepared material was determined as Li(Ni0.7Co0.11Mn0.16Al0.03)O2. In the voltage range of 2.8–4.3 V, the initial discharge capacity and charge-discharge efficiency at 0.1C were estimated to 192.0 mAh g−1 and 91.3% at 25 °C, respectively. After 200 cycles, the retained capacity was calculated as 170.7 mAh g−1 at 1C charge-discharge rate, which was equivalent to 95.8% retention. High-temperature testing at 55 °C evaluated the initial specific discharge capacity at 0.1C to 207.2 mAh g−1, with capacity retention achieving 88.6% after 200 cycles at 1C, showing excellent electrochemical properties.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 51602352), Fundamental Research Funds for the Central Universities (2012QNZT018), and China Postdoctoral Science Foundation (2012M521546).

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha City, 410083, China

    Chaopu Tan, Ke Du, Kaihua Hu, Yanbing Cao & Guorong Hu

  2. Guangzhou Libode New Materials Co., Ltd., Huadu district, Guangzhou City, 510800, China

    Hongjun Luo & Dianhua Huang

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  1. Chaopu Tan
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  2. Hongjun Luo
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  3. Ke Du
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  4. Dianhua Huang
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  7. Guorong Hu
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Correspondence to Ke Du.

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Tan, C., Luo, H., Du, K. et al. Core-shell structured Li[(Ni0.9Co0.05Al0.05)0.6(Ni0.4Co0.2Mn0.4)0.4]O2 cathode material for high-energy lithium ion batteries. Ionics 24, 1293–1304 (2018). https://doi.org/10.1007/s11581-017-2311-7

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