NiCo2O4 nanosheets and nanocones as additive-free anodes for high-performance Li-ion batteries |
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| Affiliation: | 1. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No.92 West-Da Zhi Street, Harbin 150001, China;2. Chilwee Power Co., Ltd., Changxing 313100, China;1. School of Mechanic & Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China;2. Henan Provincial Key Laboratory of Nano-composite and Applications, Huanghe Science and Technology College, Zhengzhou 450063, China;3. School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;1. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China;2. GuangDong MeiZhou Quality & Metrology Supervision and Testing Institution, Meizhou 514072, PR China;1. Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India;2. Department of Chemistry, Rajiv Gandhi University of Knowledge Technologies, RK Valley, Kadapa 516330, Andhra Pradesh, India |
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| Abstract: | Development of novel electrode materials with high energy and power densities for lithium-ion batteries (LIBs) is the key to meet the demands of electric vehicles. Transition metal oxides that can react with large amounts of Li+ for electrochemical energy storage are considered promising anode materials for LIBs. In this work, NiCo2O4 nanosheets and nanocones on Ni foam have been synthesized via general hydrothermal growth and low-temperature annealing treatment. They exhibit high rate capacities and good cyclic performance as LIB anodes owing to their architecture design, which reduces ion and electron transport distance, expands the electrode–electrolyte contact, increases the structural stability, and buffers volume change during cycles. Notably, NiCo2O4 nanosheets deliver an initial capacity of 2239 mAh g−1 and a rate capacity of 964 mAh g−1 at current densities of 100 and 5000 mA g−1, respectively. The corresponding values of nanocones are 1912 and 714 mAh g−1. Hence, the as-synthesized NiCo2O4 nanosheets and nanocones, which are carbon-free and binder-free with higher energy densities and stronger connections between active materials and current collectors for better stability, are promising for use in advanced anodes for high-performance LIBs. |
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| Keywords: | Lithium ion batteries Electrochemical performance Hydrothermal route |
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