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Method for preparing lithium-ion battery anode material lithium manganese silicate
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A lithium-ion battery and lithium manganese silicate technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as the difficulty in preparing high-purity lithium manganese silicate, and achieve the effects of short cycle, mild conditions, and low equipment requirements
Inactive Publication Date: 2010-11-03
XIAMEN UNIV
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[0006] The purpose of the present invention is to provide a method for preparing lithium manganese silicate, a positive electrode material for lithium ion batteries, in view of the disadvantage that the existing high temperature method is difficult to prepare high-purity lithium manganese silicate
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Embodiment 1
[0020] First weigh 4.2g LiOH·H 2 O into beaker 1, add 30ml of water, stir to fully dissolve LiOH, then weigh 1.5g of SiO 2 Pour it into the LiOH solution, take another beaker 2, and weigh 4.95g MnCl 2 4H 2 O, add 20ml of water, stir to let MnCl 2 Fully dissolved, then the MnCl 2 Pour the solution into beaker 1, stir it evenly, put it into a 100ml polytetrafluoroethylene-lined hydrothermal reaction kettle, react at 150°C for 48h, wash with water until neutral, filter and dry at 90°C to obtain Li 2 MnSiO 4 .
[0021] Li 2 MnSiO 4 For an X-raypowderdiffraction pattern of a material sample see figure 1 , Li 2 MnSiO 4 For SEM images of material samples see figure 2 .
Embodiment 2
[0023] First weigh 4.2g LiOH·H 2 O into beaker 1, add 40ml of water, stir to fully dissolve LiOH, then weigh 1.5g of SiO 2 Pour into LiOH solution, take another beaker 2, weigh 6.12g MnAc 2 4H 2 O, add 20ml of water, stir to let the MnAc 2 fully dissolved, and then the MnAc 2 Pour the solution into beaker 1, stir it evenly, put it into a 100ml polytetrafluoroethylene-lined hydrothermal reaction kettle, react at 180°C for 24h, wash with water until neutral, filter and dry at 120°C to obtain Li 2 MnSiO 4 .
Embodiment 3
[0025] First weigh 2.1g LiOH·H 2 O into beaker 1, add 30ml of water, stir to fully dissolve LiOH, then weigh 0.75g of SiO 2 Pour it into the LiOH solution, take another beaker 2, and weigh 1.44g MnCO 3 , add 20ml of water, stir to let MnCO 3 fully dispersed, and then the MnCO 3 Pour it into beaker 1, stir it evenly, put it into a 100ml polytetrafluoroethylene-lined hydrothermal reaction kettle, react at 200°C for 24h, wash with water until neutral, filter and dry at 150°C to obtain Li 2 MnSiO 4 .
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Abstract
The invention discloses a method for preparing a lithium-ion battery anode material lithiummanganesesilicate, and relates to a lithium-ion battery. The method for preparing the lithium-ion battery anode material lithium manganesesilicate comprises the following steps of: adding lithium hydroxide and siliconoxide into water; dispersing manganese salt into the water; and after the substances are mixed and stirred, transferring the mixture into a hydrothermal kettle to perform hydrothermal reaction, and washing, filtering and drying the reaction product to obtain a target product, namely the lithium manganese silicate. The prepared lithium manganese silicate granules are small; the size of the granules can be controlled within a nano-micro range by adjusting the process conditions; the prepared powder has good dispersion property; and the method has the advantages of mild condition, simple process, simple and convenient operation, short period, high efficiency and low equipment requirement, and is easy for industrialized large-scale production of the high-purity lithium manganese silicate.
Description
technical field [0001] The invention relates to a lithium-ion battery, in particular to a lithium-ion battery anode material manganese lithium silicate (Li 2 MnSiO 4 ) preparation method. Background technique [0002] As a high-capacity portable power device, lithium-ion batteries have been applied to more and more fields and played an increasingly important role. Therefore, the development of lithium-ion batteries has been widely concerned by researchers. The progress from simple oxidation / reduction mechanism to lithium ion intercalation / deintercalation mechanism provides new ideas for the research and development of lithium-ion batteries. Currently commercial lithium-ion batteries contain more or less elements such as Co and Ni, but they are expensive. The price and potential toxicity limit their application, and the high-capacity, cost-effective green battery materials that can replace them have become new research objects. [0003] The proposal of olivine-type lithium...
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