Preparation method for nano MnO of negative electrode material of lithium ion battery
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A lithium-ion battery and negative electrode material technology, applied in battery electrodes, nanotechnology, circuits, etc., can solve the problems of reducing battery energy density and increasing battery safety hazards, achieving stable cycle performance, suitable for large-scale production, and good safety Effect
Inactive Publication Date: 2011-08-17
BEIJING UNIV OF TECH
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In these literatures, the introduction of carbon improves the conductivity of the MnO material and significantly improves the cycle stability of the electrode, but the larger carbon content in the material will reduce the energy density of the battery and increase the battery life. Security risks
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Embodiment 1
[0024] (1) Under magnetic stirring conditions, at first 0.1 gram of polyvinylpyrrolidone K30 was completely dissolved in 50 mL of ethylene glycol, then 0.84 gram of citric acid monohydrate was added, and then 1.47 gram of manganese acetate tetrahydrate was added to dissolve after it was completely dissolved;
[0025] (2) heating the above mixture at 150°C while magnetically stirring to evaporate the solvent;
[0026] (3) Then transfer the obtained brown-red viscous substance to a 150° C. oven for drying for 4 hours;
[0027] (4) Finally, the above-mentioned dried product is dissolved in hydrogen containing 5% (volume) H 2 / Ar mixed atmosphere at 800° C. for 1 h to obtain nanometer MnO as an anode material for lithium ion batteries.
Embodiment 2
[0029] (1) Under magnetic stirring conditions, at first 0.1 gram of polyvinylpyrrolidone K30 was completely dissolved in 50 mL of ethylene glycol, then 1.26 gram of citric acid monohydrate was added, and then 1.47 gram of manganese acetate tetrahydrate was added to dissolve after it was completely dissolved;
[0030] (2) heating the above mixture at 150°C while magnetically stirring to evaporate the solvent;
[0031] (3) Then transfer the obtained brown-red viscous substance to a 150° C. oven for drying for 4 hours;
[0032] (4) Finally, the above-mentioned dried product is dissolved in hydrogen containing 5% (volume) H 2 / Ar mixed atmosphere at 800° C. for 1 h to obtain nanometer MnO as an anode material for lithium ion batteries.
Embodiment 3
[0034] (1) Under magnetic stirring conditions, at first 0.2 grams of polyvinylpyrrolidone K30 is completely dissolved in 100 mL of ethylene glycol, then 2.52 grams of citric acid monohydrate is added, and then 2.94 grams of manganese acetate tetrahydrate is added to dissolve after it is completely dissolved;
[0035] (2) heating the above mixture at 150°C while magnetically stirring to evaporate the solvent;
[0036] (3) Then transfer the obtained brown-red viscous substance to a 150° C. oven for drying for 4 hours;
[0037] (4) Finally, the above-mentioned dried product is dissolved in hydrogen containing 5% (volume) H 2 / Ar mixed atmosphere at 800° C. for 1 h to obtain nanometer MnO as an anode material for lithium ion batteries.
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Abstract
The invention discloses a preparation method for nano MnO of a negative electrode material of a lithium ion battery, which belongs to the technical field of lithium ion battery material and electrochemistry. The method comprises the following steps of: firstly dissolving polyvinylpyrrolidone K30 in glycol under the condition of magnetic stirring, wherein the concentration of the polyvinylpyrrolidone K30 is 2.0 to 4.0 g/L; then adding citric acid monohydrate with the concentration of 8.4 to 42.0 g/L; adding manganese acetate tetrahydrate when the adding citric acid monohydrate is dissolved completely, wherein the molar ratio of the citric acid monohydrate to the manganese acetate tetrahydrate is between 0.3 and 1.6; and then subjecting the mixture to magnetic stirring, heating the mixture between 140 DEG C and 180 DEG C to evaporate the solvent; transferring the red-brown sticky material obtained into an over of 140 to 180 DEG C to dry for 3 to 5 hours; and finally subjecting the product dried to thermal treatment of 600 to 1000 DEG C for 1 hour in H2/Ar mixed atmosphere to obtain nano MnO of a negative electrode material of a lithium ion battery. The preparation method for nano MnO of a negative electrode material of a lithium ion battery provided by the invention has the advantages that the specific capacity of the nano MnO negative electrode material prepared by means of themethod provided by the invention is high, the cycle performance is stable, the security performance is good, the preparation method is simple and easy, the production conditions are mild, and the preparation method is suitable for large-scale production.
Description
technical field [0001] The invention relates to a preparation method of a nano-transition metal oxide material, which belongs to the technical field of lithium-ion battery negative electrode materials and electrochemistry. Background technique [0002] One of the key technologies for the development of high-performance lithium-ion batteries is the research and development of negative electrode materials. The performance of negative electrode materials affects the performance of batteries to a large extent. At present, commercial anode materials are mainly graphite-based carbon materials, which are low in cost, have high conductivity and good cycle stability. However, the theoretical capacity of graphite-based negative electrodes is low (LiC 6 , 372mAhg -1 ), which cannot meet the growing needs; and the discharge platform is too low (0 ~ 0.25V), there are potential safety hazards. Therefore, seeking new anode materials with high capacity and good safety has become the deve...
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