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A method for synthesizing lithium iron silicate/crystalline carbon composite cathode material

A composite positive electrode material, lithium iron silicate technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of poor conductivity, affect the effective load of active materials, and difficult to control carbon content, and achieve high value-added applications , Improve the conductivity and the effect of active material loading

Inactive Publication Date: 2016-03-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent application CN103346300A proposes a method for synthesizing silicate / carbon composite positive electrode material with rice husk as raw material, in this method, the structure of carbon is amorphous carbon, electrical conductivity is relatively poor; In addition, the content of carbon in the composite positive electrode material is relatively high Difficult to control, thus affecting the effective loading of active materials in composite cathode materials

Method used

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Embodiment 1

[0025] The method for synthesizing lithium iron silicate / crystalline carbon composite positive electrode material, its specific steps are as follows:

[0026] (1) Firstly pickling, washing, filtering and drying 500g of rice husks to obtain rice husks free of alkali metal oxide impurities, wherein the rice husks include the following mass percentage components: crude fiber 45%, lignin 26%, ash 11.4% %, silicon dioxide 10%; the acid in the pickling process is HCl, its concentration is 5wt%, the pickling time is 10h, and the washing is deionized water until the pH is 6-7;

[0027] (2) Pyrolyzing the rice husk obtained in step (1) with the alkali metal oxide impurities removed at low temperature under anaerobic conditions to obtain pyrolyzed rice husk, wherein the pyrolysis temperature is 600°C, and the pyrolysis time is 0.1h;

[0028] (3) Add the pyrolyzed rice husk obtained in step (2) into the precursor salt solution of transition metal M1 according to the liquid-solid ratio of...

Embodiment 2

[0034] The method for synthesizing lithium iron silicate / crystalline carbon composite positive electrode material, its specific steps are as follows:

[0035] (1) First pickling, washing, filtering and drying the rice husks to obtain the rice husks free of alkali metal oxide impurities, wherein the rice husks include the following mass percentage components: crude fiber 35.5%, lignin 21%, ash 22% , silicon dioxide 21%; the acid in the pickling process is HCl, its concentration is 40wt%, the pickling time is 2h, and the washing is deionized water until the pH is 6-7;

[0036] (2) Low-temperature pyrolysis of the rice husk obtained in step (1) from which alkali metal oxide impurities have been removed is performed under anaerobic conditions to obtain pyrolyzed rice husk, wherein the pyrolysis temperature is 400° C., and the pyrolysis time is 0.5 h;

[0037] (3) Add the pyrolyzed rice husk obtained in step (2) into the precursor salt solution of transition metal M1 according to the...

Embodiment 3

[0043] The method for synthesizing lithium iron silicate / crystalline carbon composite positive electrode material, its specific steps are as follows:

[0044] (1) Firstly pickling, washing, filtering and drying the rice husks to obtain rice husks free of alkali metal oxide impurities, wherein the rice husks include the following components in mass percentages: crude fiber 40.3%, lignin 23.5%, ash 16.7% , silica 15.5%; the acid in the pickling process is H 2 SO 4 , the concentration is 20wt%, the pickling time is 9h, and the washing is deionized water until the pH is 6-7;

[0045] (2) Pyrolyzing the rice husk obtained in step (1) from which alkali metal oxide impurities have been removed at low temperature under aerobic conditions to obtain pyrolyzed rice husk; wherein the pyrolysis temperature is 500°C, and the pyrolysis time is 1 hour;

[0046] (3) Add the pyrolyzed rice husk obtained in step (2) to the precursor salt solution of transition metal M1 according to the liquid-...

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Abstract

The invention relates to a method for synthesis of a lithium iron silicate / crystallized carbon composite positive electrode material, and belongs to the technical field of lithium ion battery. The method comprises the steps: pickling rice husks, washing, filtering and drying to obtain rice husks having alkali metal oxide impurities removed; under an oxygen-free or aerobic condition, carrying out low-temperature pyrolysis of the rice husks having the alkali metal oxide impurities removed to obtain pyrolyzed rice husks; adding the obtained pyrolyzed rice husks into a transition metal M1 precursor salt solution, and then carrying out a catalytic carbonization reaction at a high temperature to obtain a catalytic carbonized product; carrying out low temperature oxidation of the catalytic carbonized product to obtain an oxidative product; adding an iron source and a lithium source into the oxidative product, carrying out wet grinding to obtain a mixed material, and then drying the mixed material; and under an inert atmosphere, baking the dried mixed material at the temperature of 500-800 DEG C for 1-20 h, and thus obtaining the lithium iron silicate / crystallized carbon composite positive electrode material. The method improves the crystallinity of carbon in the silicate / carbon composite positive electrode material prepared from the rice husks.

Description

technical field [0001] The invention relates to a method for synthesizing a lithium iron silicate / crystalline carbon composite positive electrode material, belonging 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 are widely used, and the research and development of electric vehicles is also being carried out extensively and deeply, thus driving the rapid development of lithium-ion batteries, which provide energy for the above-mentioned equipment. develop. Compared with traditional nickel-metal hydride batteries and nickel-cadmium batteries, lithium-ion batteries have the advantages of high energy density, high working voltage, small self-discharge, fast charging and discharging, and good safety performance. They are the fastest growing and brightest market prospects. A secondary battery. [0003] In lithium-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/364H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 刘树和赵淑春
Owner KUNMING UNIV OF SCI & TECH
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