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Method for synthesizing lithium iron silicate positive electrode material by using chrysotile asbestos as raw material

A technology of lithium iron silicate and positive electrode materials, which is applied in the direction of chemical instruments and methods, battery electrodes, silicon compounds, etc., can solve the problems of high price and unsuitability for large-scale production, and achieve low equipment investment, broad application, and short process Effect

Inactive Publication Date: 2014-08-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The silicon source for preparing high-performance lithium iron silicate is mostly nano-silica, which is expensive and not suitable for large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The method for synthesizing lithium iron silicate cathode material using chrysotile asbestos as a raw material has the following specific steps:

[0021] (1) First, 1g of serpentine asbestos according to H + The concentration and the mass ratio of chrysotile asbestos is 0.025:1mol / g, placed in an acidic solution, acid immersed for 127 minutes at a temperature of 96℃, and then washed, filtered and dried to obtain a second product for removing alkali metal oxide impurities. Silica nanofibers, in which chrysotile asbestos includes the following mass percentage components: Si19%, Mg19%, Fe2.4%, Al0.29%, O42.3%;

[0022] (2) Using lithium salt, ferrous salt and the nano-silica fiber obtained in step (1) as raw materials, wet milling and mixing uniformly at a molar ratio of Li, Fe, and Si of 2:1:1 to obtain a precursor mixture. In the wet grinding process, ethanol is added according to a liquid-solid ratio of 20ml / g, the lithium source is lithium carbonate; the ferrous salt is fer...

Embodiment 2

[0027] The method for synthesizing lithium iron silicate cathode material using chrysotile asbestos as a raw material has the following specific steps:

[0028] (1) First, put 10g serpentine asbestos according to H + The concentration and the mass ratio of chrysotile asbestos is 0.05: 2mol / g, placed in an acid solution, acid immersed for 100 minutes at a temperature of 90 ℃, and then washed with water, filtered and dried to obtain a second product for removing alkali metal oxide impurities. Silica nanofibers, including Si19%, Mg25%, Fe1.6%, Al0.32%, O53%, and the acidic solution is hydrochloric acid;

[0029] (2) Using lithium salt, ferrous salt and the nano-silica fiber obtained in step (1) as raw materials, wet milling and mixing uniformly at a molar ratio of Li, Fe, and Si of 2:1:1 to obtain a precursor mixture. Among them, ethanol is added at a liquid-solid ratio of 80ml / g during the wet grinding process, the lithium source is lithium acetate, and the ferrous salt is ferrous ox...

Embodiment 3

[0034] The method for synthesizing lithium iron silicate cathode material using chrysotile asbestos as a raw material has the following specific steps:

[0035] (1) First, put 10g serpentine asbestos according to H + The concentration and the mass ratio of chrysotile asbestos is 0.03:1 mol / g, placed in an acid solution, acid immersed for 42 minutes at a temperature of 98 ℃, and then washed, filtered and dried to obtain a second product for removing alkali metal oxide impurities. Silica nanofibers, in which chrysotile asbestos includes the following mass percentage components: Si27%, Mg22%, Fe0.13%, Al0.03%, O48%, and the acidic solution is sulfuric acid;

[0036] (2) Using lithium salt, ferrous salt and the nano-silica fiber obtained in step (1) as raw materials, wet milling and mixing uniformly at a molar ratio of Li, Fe, and Si of 2:1:1 to obtain a precursor mixture. In the wet grinding process, acetone is added according to the liquid-solid ratio of 60ml / g, the lithium salt is l...

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Abstract

The invention relates to a method for synthesizing a lithium iron silicate positive electrode material by using chrysotile asbestos as raw material, and belongs to the technical field of lithium ion battery. The method comprises the steps: placing the chrysotile asbestos in an acidic solution, carrying out acid dipping, then carrying out water washing, filtering and drying to obtain a silica nanofiber having alkali metal oxide impurities removed; carrying out wet grinding and even mixing of a lithium salt, a ferrous salt and the silica nanofiber obtained in the above steps to obtain a precursor mixture, under a protective atmosphere, tabletting the obtained precursor mixture, then carrying out heat preservation for 7-13 h under a condition of the temperature of 650 DEG C-800 DEG C, cooling to the room temperature, and thus obtaining the lithium iron silicate positive electrode material. The method has the advantages of simple process and low cost, and provides conditions for cyclic utilization of asbestos tailings of an asbestos mine and achieving of sustainable development of enterprise and mineral resources.

Description

Technical field [0001] The invention relates to a method for synthesizing a lithium iron silicate cathode material using chrysotile asbestos as a raw material, and belongs to the technical field of lithium ion batteries. Background technique [0002] With the rapid development of the electronics and information industries, mobile communications, digital cameras and portable computers have been widely used, and the research and development of electric vehicles are also being carried out extensively, thus driving the rapid development of lithium-ion batteries that provide energy for the above-mentioned equipment development of. Compared with traditional nickel-hydrogen batteries and nickel-cadmium batteries, lithium-ion batteries have the advantages of high energy density, high working voltage, low self-discharge, fast charge and discharge, and good safety performance. They are currently the fastest growing and have the brightest market prospects. A kind of secondary battery. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B33/20
CPCH01M4/5825H01M10/0525C01B33/20Y02E60/10
Inventor 刘树和赵淑春
Owner KUNMING UNIV OF SCI & TECH
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