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Metal-carbon composite coated lithium ferrous silicate material, and preparation method and application thereof

A lithium ferrous silicate and carbon composite technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as difficult electron transfer, low electronic conductivity, and low discharge capacity

Inactive Publication Date: 2019-06-14
王海龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the [SiO 4 ] Tetrahedral separation, difficult electron transfer in the lattice, various crystal forms of Li 2 FeSiO 4 The energy band gap is large (about 3.0eV), and the electronic conductivity is extremely low (about 10 -14 S.cm -1 ), unmodified Li 2 FeSiO 4 Usually can only release less than 150mAh.g in the first week -1 capacity
However, these two methods have high raw material costs and complicated preparation processes, and require the preparation of Li 2 FeSiO 4 On the basis of coating, the degree of graphitization cannot be controlled; and the discharge capacity is not high, it is difficult to meet industrial needs

Method used

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  • Metal-carbon composite coated lithium ferrous silicate material, and preparation method and application thereof
  • Metal-carbon composite coated lithium ferrous silicate material, and preparation method and application thereof
  • Metal-carbon composite coated lithium ferrous silicate material, and preparation method and application thereof

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preparation example Construction

[0040] The present invention provides a method for preparing a metal-carbon composite-coated lithium ferrous silicate material described in the above technical solution, comprising the following steps:

[0041] mixing the lithium salt solution, the iron salt solution and the tetraethyl orthosilicate solution to undergo a hydrolysis reaction to obtain a first mixed solution;

[0042] mixing the first mixed solution with the citric acid solution to generate a first gel reaction to obtain a second mixed solution;

[0043] mixing the second mixed solution with the metal salt solution to generate a second gel reaction to obtain a gel;

[0044] The gel is dried, pre-sintered and sintered in sequence to obtain a metal-carbon composite coated lithium ferrous silicate material.

[0045] The invention mixes the lithium salt solution, the iron salt solution and the tetraethyl orthosilicate solution to undergo a hydrolysis reaction to obtain the first mixed solution.

[0046] In the pre...

Embodiment 1

[0064] Add 0.02 mol tetraethyl orthosilicate dropwise into 14 mL of a mixed solution composed of absolute ethanol and water (volume ratio 3:1) at a rate of 0.05 mL / min to obtain a tetraethyl orthosilicate solution;

[0065] Dissolve 0.04mol lithium nitrate in 14mL of a mixed solution composed of absolute ethanol and water (volume ratio 3:2) to obtain a lithium nitrate solution;

[0066] 0.04mol ferric nitrate was dissolved in 14mL of a mixed solution composed of absolute ethanol and water (volume ratio 3:2) to obtain the first ferric nitrate solution;

[0067] Dissolve 0.06mol citric acid in 14mL of a mixed solution composed of absolute ethanol and water (volume ratio 3:2) to obtain a citric acid solution;

[0068] 0.002mol ferric nitrate was dissolved in 5mL of a mixed solution composed of absolute ethanol and water (volume ratio 3:2), to obtain the second ferric nitrate solution;

[0069] Add the lithium nitrate solution and the first ferric nitrate solution into the tetrae...

Embodiment 2

[0074] The preparation method is basically the same as in Example 1, except that the calcining temperature is adjusted from "250°C" to "350°C" to obtain metal-carbon composite-coated lithium ferrous silicate material Li 2 FeSiO 4 / C / Fe 0.1 , the Li 2 FeSiO 4 The particle size of the composite coating layer is 60nm; wherein, the thickness of the composite coating layer is 2-5nm, and the particle size of the nano-iron in the composite coating layer is 30nm.

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Abstract

The invention provides a metal-carbon composite coated lithium ferrous silicate material, and a preparation method and an application thereof, and belongs to the technical field of lithium ion batterymaterials. The invention provides the metal-carbon composite coated lithium ferrous silicate material comprising a lithium ferrous silicate core and a composite coating layer that comprises a carbonlayer and nano metal embedded into the carbon layer. According to the metal-carbon composite coated lithium ferrous silicate material and the preparation method and application thereof, the highly graphitized metal-carbon composite coated lithium ferrous silicate material is acquired via the catalysis of nano metal, the material has the capacity of 325mAh*g<-1> under the 0.2C current density; thematerial is wide in source, low in cost and excellent in conductivity and capacity performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a metal-carbon composite-coated lithium ferrous silicate material and a preparation method and application thereof. Background technique [0002] Since Nyten et al. synthesized electrochemically active lithium ferrous silicate (Li 2 FeSiO 4 ), different crystal forms of Li 2 FeSiO 4 been discovered one after another, among which P2 1 / n and Pmn2 1 Li of the space group structure 2 FeSiO 4 most common. Due to the [SiO 4 ] Tetrahedral separation, difficult electron transfer in the lattice, various crystal forms of Li 2 FeSiO 4 The energy band gap is large (about 3.0eV), and the electronic conductivity is extremely low (about 10 -14 S.cm -1 ), unmodified Li 2 FeSiO 4 Usually can only release less than 150mAh.g in the first week -1 capacity. Conductive carbon coating and nanonization can effectively improve the conductivity and electrochemical act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCY02E60/10
Inventor 王海龙何苗
Owner 王海龙