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Preparation method of lithium cobaltate electrolyte for inhibiting lithium dendrite growth

A technology for growing lithium cobaltate and electrolytes, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of ineffective inhibition of lithium dendrites and weak mechanical strength, and achieve the effect of inhibiting the growth of dendrites

Inactive Publication Date: 2018-07-31
王群华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional polyethylene oxide-based polymer film has weak mechanical strength and cannot effectively suppress lithium dendrites, and often needs to be improved by adding hard inorganic nanoparticles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the chemical formula of niobium modified lithium cobaltate is LiCo 0.86 Fe 0.12 Nb 0.02 o 2 According to the molar weight of Li, Fe, Nb, Co in the above chemical formula, lithium carbonate, iron acetate, niobium oxide and cobalt oxide are weighed, and an appropriate amount of water and ethanol are used as the dispersion medium, and the raw materials taken symmetrically are mixed by wet ball milling , to obtain a mixed slurry; spray-dry the mixed slurry to obtain lithium cobaltate precursor powder.

[0023] Apply a plasma arc to the precursor powder in a reducing atmosphere to melt the reaction powder, the plasma arc voltage is 20kV, and the plasma arc current is 500A; the molten reaction powder is sprayed into the cooling device with a reducing gas, and the particles are pulverized after cooling Sieving, the niobium-modified lithium cobalt oxide material with a particle size of 5 microns obtained through sieving; wherein the diameter of the nozzle...

Embodiment 2

[0028] In this embodiment, the chemical formula of niobium modified lithium cobaltate is LiCo 0.82 Fe 0.15 Nb 0.03 o 2 . Weigh lithium carbonate, iron acetate, niobium oxide and cobalt oxide according to the molar weights of Li, Fe, Nb and Co in the above chemical formula, and use an appropriate amount of water and ethanol as the dispersion medium, and carry out wet ball milling of the raw materials that are taken symmetrically. The mixed slurry is obtained; the mixed slurry is spray-dried to obtain lithium cobaltate precursor powder.

[0029] Apply a plasma arc to the precursor powder in a reducing atmosphere to melt the reaction powder, the plasma arc voltage is 40kV, and the plasma arc current is 1000A; the molten reaction powder is sprayed into the cooling device with a reducing gas, and the particles are pulverized after cooling Sieving, the niobium-modified lithium cobaltate material with a particle size of 10 microns obtained through sieving; wherein the diameter of...

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Abstract

The invention relates to a preparation method of a lithium cobaltate electrolyte for inhibiting lithium dendrite growth, the method is simple and easy to operate, low in cost and short in time; according to the method, an inorganic electrolyte excellent in electrochemical performances can be obtained by doping of Nb ions in a positive electrode material and isomorphous substitution of Co ion sitesin lattices of the positive electrode material to change parameters of the lattices; and a light carbon-nitrogen polymer as a filler is uniformly mixed with the electrolyte to form a solid electrolyte which can be used for suppression of lithium dendrite growth in lithium metal batteries.

Description

Technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a lithium cobalt oxide electrolyte for inhibiting the growth of lithium dendrites. Background technique [0002] LiCoO 2 It is the main cathode material for commercial lithium-ion batteries at present, but it has disadvantages such as expensive, not conducive to environmental protection, and low specific capacity. LiNbO 2 The positive electrode material doped with Co element also has LiNbO 2 The high discharge specific capacity of the material stabilizes the layered structure of the material and enhances the cycle stability of the material, but this material also has defects such as poor overcharge resistance, poor thermal stability, and high irreversible capacity for the first discharge. . [0003] In addition, safety issues are the most important factor in the commercialization of lithium batteries, the main crux of which is that sulfur lit...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0562H01M10/4235H01M2300/0068Y02E60/10
Inventor 王群华
Owner 王群华
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