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A lithium silica permanganate -lithium siliconate/carbon composite material and preparation method of alkaline soil metal ions

A carbon composite material, silicomanganic acid-based technology, applied in the direction of nanotechnology, nanotechnology, structural parts, etc. for materials and surface science, can solve the problem of low electronic conductivity and ion diffusivity, can not meet the growing demand, Restricting the promotion and application and other issues, to achieve the effect of improving rate performance, improving electrochemical performance, and shortening diffusion distance

Active Publication Date: 2020-04-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the positive electrode materials currently used in lithium-ion batteries (such as layered transition metal oxides (LiMO 2 ), spinel lithium manganate (LiMn 2 o 4 ) and olivine-type lithium iron phosphate (LiFePO 4 )) There are different defects: poor safety performance, low energy density or poor conductivity, etc., can no longer meet the growing demand for energy equipment under the current energy crisis and greenhouse effect
However, the performance of the lithium-ion battery cathode material greatly limits its application, and the shortcomings of the material's poor cycle stability, low electronic conductivity and low ion diffusivity severely restrict its electrochemical performance and restrict its Commercial promotion and application

Method used

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  • A lithium silica permanganate -lithium siliconate/carbon composite material and preparation method of alkaline soil metal ions
  • A lithium silica permanganate -lithium siliconate/carbon composite material and preparation method of alkaline soil metal ions
  • A lithium silica permanganate -lithium siliconate/carbon composite material and preparation method of alkaline soil metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of silicon manganese acid-based lithium / carbon composite material, the general chemical formula is Li 2 mn 0.95 Ca 0.05 SiO 4 / C, the mass of carbon in the material accounts for 19-20% of the total mass of the material; the material is tested and analyzed by XRD, such as figure 1 As shown, the material is orthorhombic, Pmn2 1 space group; after determination, the b-axis of the material unit cell parameter is a axis is The c axis is figure 2 For pictures under a high-resolution transmission electron microscope, such as figure 2 As shown, the material is in the shape of 2-20nm nano-rods or nano-sheets. figure 2 Fourier transform (FFT) of the picture is obtained image 3 , as shown in the figure, is a picture of diffraction spots. After calibration, it is found that these crystal grains are [001] with axes, showing the characteristics of (001) crystal plane exposure; the X-ray photoelectron spectroscopy test is carried out on the material, and the re...

Embodiment 2

[0030] The composite material of embodiment 1 is prepared according to the following steps:

[0031] (I) At room temperature, weigh 40mmol of LiOH and dissolve it in 40mL of diethylene glycol to make the pH value 10, then add 10mmol of tetraethyl silicate and stir for 50 minutes until the tetraethyl silicate is completely Dissolve to obtain solution A, wherein the molar mass ratio of Li element and Si element is 4:1; 9.5mmolMnCl 2 4H 2 O and 0.5 mmol CaCl 2 Dissolve in 20mL of diethylene glycol to obtain solution B;

[0032] (II) Add solution B prepared in step (I) dropwise to solution A, keep the pH value of the system constant, then mix the solution under 4Mpa pressure, react at 230°C for 72 hours, then cool naturally to room temperature; After centrifugation, the product was centrifugally washed with deionized water and ethanol for several times until the solvent after washing was neutral, and then the solid product was vacuum-dried at 80°C to obtain Li 2 mn 0.95 Ca 0...

Embodiment 3

[0035] A kind of silicon manganese acid-based lithium / carbon composite material, the general chemical formula is Li 2 mn 0.95 Mg 0.05 SiO 4 / C, the mass of carbon in the material accounts for 19-20% of the total mass of the material; the material is orthorhombic through XRD detection and refinement analysis, Pmn2 1 space group, the b-axis of the material unit cell parameter is a axis is The c axis is The material is composed of nanosheets and nanorod particles of 5-50nm. The material shows [001] band axis spots under the high-resolution transmission electron microscope, showing the characteristics of (001) crystal plane exposure; X-ray photoelectron spectroscopy is carried out on the material According to the test, lithium and silicon are enriched on the surface of the material, while manganese and magnesium are enriched in the material.

[0036] The preparation method is as follows:

[0037] (I) At room temperature, weigh 20mmol of LiOH and dissolve it in 40mL of di...

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Abstract

The invention provides a lithium manganese silicate / carbon composite material doped with alkaline-earth metal ions and a preparing method thereof. The chemical formula of the material is Li2Mn(1-x)MxSiO4 / C, wherein 0<x<=0.10, and M is selected from one of Mg, Ca, Sr or Ba. The material displays [001] spots with axes under a high-resolution transmission electron microscopy, and is prepared based on the principle of a hydrothermal method. The lithium manganese silicate / carbon composite material is uniform in shape and high in degree of crystallinity, [001] crystal faces are exposed, and due todoping of alkaline-earth metal elements, the lattice constants of the material are changed; meanwhile, all the elements show the features that concentrations are distributed in a gradient mode, thus promoting of electrical conductivity is facilitated, and the material has excellent electrochemical performance under high magnification.

Description

technical field [0001] The invention relates to a lithium battery cathode active material and a preparation method, in particular to an ion-doped lithium silicomanganate-based lithium / carbon composite material and a preparation method. Background technique [0002] Due to the positive electrode materials currently used in lithium-ion batteries (such as layered transition metal oxides (LiMO 2 ), spinel lithium manganate (LiMn 2 o 4 ) and olivine-type lithium iron phosphate (LiFePO 4 )) have different defects: poor safety performance, low energy density or poor conductivity, etc., which can no longer meet people's increasing demand for energy equipment under the current energy crisis and greenhouse effect. This forces researchers to actively develop and research a new generation of cathode materials for lithium-ion batteries with high energy density, good safety, environmental friendliness and low cost. [0003] Lithium manganese silicate (Li 2 MnSiO 4 ) material is a ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 韦伟峰冯伊铭冀然丁正平
Owner CENT SOUTH UNIV
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