Preparation method of carbon-coated MnO/flake graphite composite electrode material for lithium ion battery
A lithium-ion battery, flake graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult to obtain uniform carbon-coated layer composite materials, low electronic conductivity of composite materials, and unsuitable for industrial production. , to achieve the effect of enhancing electronic conductivity and structural stability, good electrochemical performance, and low preparation cost
Inactive Publication Date: 2019-05-28
HENAN NORMAL UNIV
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Problems solved by technology
K.F.Zhong et al. reported that MnO / C composites with different particle sizes were prepared by ball milling MnO and sucrose, and the electrochemical performance of small particles of MnO / C composites was significantly improved (J.Power Sources 195.2010.3300) , but this method is difficult to obtain a composite material with a uniform carbon coating layer
Recently, J.Liu et al. reported a method of obtaining MnO / C composites by heat treatment after the reaction of benzoic acid and manganese acetate in an ethanol system (Electrochemical and Solid-State Letters13.2010.A139). The raw materials of this method are expensive and The electronic conductivity of the composite material is low, and MnO is easily oxidized to MnO during heat treatment under air atmosphere conditions 3 o 4 , the reaction is not easy to control, not suitable for industrial production
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[0030] Step S1: Preparation of MnO / flaky graphite precursor
[0031] Ultrasonically disperse 240 mg potassium permanganate and 40 mg flake graphite with a particle size of 3500 mesh in deionized water. After the potassium permanganate is completely dissolved, continue to stir for 10 minutes to obtain a uniform dispersion. The MnO / flaky graphite precursor was obtained at a constant temperature of 135°C for 10 hours, in which MnO was cross-linked and anchored in the flake graphite in the form of flakes;
[0032] Step S2: Preparation of polydopamine-coated MnO / flake graphite composites
[0033] Disperse 100 mg of the MnO / graphite flake precursor obtained in step S1 in 120 mL of tris buffer with pH=8.5, continue stirring for 10 min, then add 15 mg of dopamine, and continue to stir at room temperature for 5 h on the MnO / graphite flake In-situ polymerization of dopamine, centrifugation and water washing after the reaction to obtain polydopamine-coated MnO / flaky graphite composites;...
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Abstract
The invention discloses a preparation method of a carbon-coated MnO / flake graphite composite electrode material for a lithium ion battery, and belongs to the technical field of lithium ion battery electrode materials. According to the preparation method, MnO nanoparticles are uniformly anchored on micron-sized flake graphite; carbon coating is introduced through in-situ polymerization and post-annealing treatment, so that the electronic conductivity and the structural stability are further enhanced, the system effectively combines the high conductivity of flake graphite and the high specific capacity of MnO together, and the advantages of flake graphite and MnO are brought into full play. The preparation cost is low, the technological process is simple, the safety is high, and the preparedcomposite electrode material has excellent lithium storage performance and is expected to be used as a negative electrode material to be applied to a high-performance lithium ion battery.
Description
technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and in particular relates to a preparation method of carbon-coated MnO / flaky graphite composite electrode materials for lithium-ion batteries. Background technique [0002] Lithium-ion battery is currently a portable chemical power source with the highest specific energy. It has the advantages of high output voltage, stable discharge voltage, high energy density, low self-discharge rate, and long storage and working life. With the rapid development of the miniaturization and miniaturization of today's electronic equipment, the research and application of lithium-ion batteries are getting more and more attention. The positive and negative electrode materials of lithium-ion batteries are important factors that determine the battery capacity and safety. The current commercial negative electrode materials are mainly graphitized carbon negative electrodes. The theoretic...
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IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCY02E60/10
Inventor 李欢欢薛艳白光月王玉洁
Owner HENAN NORMAL UNIV