Lithium ion battery cathode material and preparation method for lithium ion battery cathode material
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A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as affecting structure and electrochemical stability, difficult to form cubic close-packed, and battery capacity attenuation.
Inactive Publication Date: 2012-07-18
BEIJING NORMAL UNIVERSITY +1
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Furthermore, due to the high spin Mn 3+ The resulting Jahn-Teller distortion changes the spatial arrangement of oxygen, making it difficult to form an ideal cubic close-packed structure, which affects its structure and electrochemical stability, causing the battery capacity to rapidly decay
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[0024] The invention provides lithium-ion battery cathode material LiMn x Al 1-x o 2 , the preparation method of 0.7≤x<1, comprising:
[0025] Dimanganese trioxide is dissolved in lithium hydroxide aqueous solution, and then aluminum oxide is added thereto to obtain a mixture, the molar ratio of lithium to manganese is 10:1 to 20:1, and the molar ratio of manganese trioxide to aluminum oxide is The ratio can be calculated according to 0.7≤xx Al 1-x o 2 , 0.7≤x<1.
[0026] If no aluminum oxide is added in the reaction, the final prepared sample is LiMnO 2 .
[0027] In addition, the preparation method provided by the invention is also applicable to the synthesis of other doped LiMn x m 1-x o 2 (M=Zn, Co, Ni, etc.) Lithium battery cathode material.
[0028] The present invention also provides a lithium battery positive electrode, including the lithium ion battery positive electrode material LiMn provided by the present invention x Al 1-x o 2 , 0.7≦x<1, and there are...
Embodiment 1
[0031] Dissolve 1 g of manganese trioxide in lithium hydroxide aqueous solution, the molar ratio of lithium to manganese is 10:1, add 0.034 g of aluminum oxide, stir for 10 minutes, transfer to a hydrothermal reaction kettle, and react at 150°C for 36 hours The sample was obtained, washed with water and dried overnight at 70°C to obtain LiMn 0.95 Al 0.05 o 2 .
Embodiment 2
[0033]Dissolve 1 g of manganese trioxide in lithium hydroxide aqueous solution, the molar ratio of lithium to manganese is 15:1, add 0.0715 g of aluminum oxide, stir for 10 minutes, transfer to a hydrothermal reaction kettle, and react at 130°C for 36 hours The sample was obtained, washed with water and dried overnight at 60°C to obtain LiMn 0.9 Al 0.1 o 2 .
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Abstract
The invention provides a lithium ion battery cathode material. The chemical formula of the lithium ion battery cathode material is LiMnxAl1-xO2, wherein x is not less than 0.7 but is less than 1. The preparation method for the lithium ion battery cathode material comprises the following steps of: dissolving manganic oxide into lithium hydroxide aqueous solution to obtain mixed solution; adding aluminum oxide into the mixed solution to obtain a mixture, wherein the molar ratio of lithium to manganese is (10:1)-(20:1); performing a hydro-thermal reaction on the mixture at the temperature of 110-200 DEG C to generate the LiMnxAl1-xO2, wherein x is not less than 0.7 but is less than 1. According to the preparation method for the lithium ion battery cathode material, Al<3+> is introduced into layered LiMnO2 so as to restrain the Jahn-Teller effect of Mn<3+> and stabilize the structure of the layered LiMnO2; relative to the layered LiMnO2, the area impedance rate of the material can be effectively lowered by the LiMnxAl1-xO2, and meanwhile, the plug-in potential and the energy density of Li<+> can also be increased, and thereby, the electrochemical performance of the material is optimized to a certain degree. The preparation method is simple and convenient in operation and is low in cost and can be used for mass production.
Description
technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Compared with traditional rechargeable batteries, lithium-ion batteries have the advantages of higher average discharge voltage, longer discharge time, and lighter weight. Around the composition of lithium-ion batteries, current research focuses on positive electrode materials, negative electrode materials, and electrolytes. At present, the specific capacity of the negative electrode material has reached twice that of the positive electrode material, and the actual low specific capacity of the positive electrode material restricts the development of lithium-ion batteries. Therefore, the study of cathode materials for lithium-ion batteries is of great significance for key issues such as reducing the cost of batteries and accelerating battery replacement. [0003] At present...
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