Surface modified positive electrode material for solid-state lithium battery and preparation method thereof

A technology of surface modification and positive electrode material, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low electronic conductivity, and achieve the effect of alleviating electrode polarization, ensuring charge transfer, and improving electronic conductivity.

Inactive Publication Date: 2019-03-15
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the research on the modification of NCM in polymer-based solid-state battery systems (especially under high operating voltage conditions) is still in its infancy.
Li 4 Ti

Method used

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  • Surface modified positive electrode material for solid-state lithium battery and preparation method thereof
  • Surface modified positive electrode material for solid-state lithium battery and preparation method thereof
  • Surface modified positive electrode material for solid-state lithium battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1~6

[0041] The solid-state lithium battery assembly process in the following embodiments 1-6 is:

[0042] (1) Preparation of positive electrode sheet: Dissolve PEO, PS, and LiTFSI in acetonitrile at a weight ratio of 2:1 to form a uniform solution, and then add the modified positive electrode material and acetylene black to the above-mentioned The solution is prepared as a slurry. Then, the slurry was coated on a carbon-coated aluminum foil, and vacuum-dried at 60° C. for 10 h to obtain a positive electrode sheet.

[0043] (2) Preparation of solid electrolyte: PEO, LiTFSI, solid electrolyte Li 7 La 3 Zr 2 o 12 The nanoparticles are dissolved in acetonitrile according to the weight ratio of 6:3:1, and the slurry is formed after uniform mixing. The slurry was coated on a polytetrafluoroethylene film, and after drying at 60° C. for 12 hours, the polytetrafluoroethylene film was peeled off to obtain a solid electrolyte.

[0044] (3) Preparation of solid-state lithium battery: Th...

Embodiment 1

[0055] (1) The preparation method of the cathode active material matrix is ​​consistent with that of the comparative example.

[0056] (2) According to the coating Li 3.9 Mg 0.1 Ti 4.9 Zr 0.1 o 12 In the metering ratio of each element, weigh the raw materials lithium acetate, magnesium carbonate, tetrabutyl titanate, zirconium nitrate solution. Dissolve the above raw materials in ethanol solution, add 0.01mol / L citric acid and stir at room temperature, then add ammonia water to the above solution to form a mixed solution with pH=10.

[0057] (3) Add the cathode active material matrix into the above mixed solution, stir at 60°C for 1 hour, and then transfer it to a vacuum drying oven at 100°C to dry completely to obtain a dry powder.

[0058] (4) Sieve the above dry powder, then sinter at 600°C for 5h, after cooling to room temperature, crush and sieve to obtain Li 3.9 Mg 0.1 Ti 4.9 Zr 0.1 o 12 A surface-modified positive electrode material for a coated solid-state li...

Embodiment 2

[0063] (1) The preparation method of the cathode active material matrix is ​​consistent with that of the comparative example.

[0064] (2) According to the coating Li 4 Ti 4.8 Mo 0.2 o 12 In the metering ratio of each element, the raw materials lithium nitrate, titanyl sulfate and ammonium molybdate were weighed. Dissolve the above raw materials in a mixed solution of ethanol and water (ethanol: water = 1: 3), stir at room temperature, and then add triethanolamine to the above solution to form a mixed solution with pH = 9.2.

[0065] (3) Add the positive electrode active material matrix into the above mixed solution, stir at 70°C for 1 hour, and then transfer it to a vacuum drying oven at 120°C for complete drying.

[0066] (4) Sieve the above dried product, then sinter at 700°C for 6h, and after cooling to room temperature, crush and sieve to obtain Li 4 Ti 4.8 Mo 0.2 o 12 A surface-modified positive electrode material for a coated solid-state lithium battery. The thi...

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Abstract

The invention discloses a surface modified positive electrode material for a solid-state lithium battery and a preparation method thereof. The modified positive electrode material consists of a positive electrode active substance matrix LiNi<x>Co<y>Mn<1-x-y-z>M<z>O<2> and a surface coating layer Li<4-alpha>M'<alpha>Ti<5-beta-gamma>M"<beta>M"'<gamma>O<12-be>G<be>. With the coating layer, the catalytic corrosion of the positive electrode active substance matrix on a polymer solid-state electrolyte can be effectively prevented, the good lithium ion and electron conduction capabilities are achieved, the interface stability of the positive electrode material is improved and the interface impedance is reduced; and the solid-state lithium battery prepared with the positive electrode material provided by the invention has excellent electrical property.

Description

technical field [0001] The invention relates to a surface-modified cathode material for a solid-state lithium battery and a preparation method thereof, belonging to the field of lithium batteries. Background technique [0002] Solid-state lithium batteries use solid-state electrolytes instead of traditional liquid electrolytes, which greatly simplifies the battery structure and have the characteristics of high safety and high energy density. It has become an important direction for the development of advanced lithium batteries. [0003] Polymer-based solid electrolytes have better high-temperature performance, are easy to form films and process, and can be used to prepare thin-film batteries and large-capacity batteries. Therefore, polymer-based solid-state lithium batteries are the first to realize small-scale commercial production. At present, Bolloré uses lithium iron phosphate (LiFePO 4 ) The polymer-based solid-state lithium battery prepared by the positive electrode h...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/582H01M10/0525Y02E60/10
Inventor 王霄鹏刘亚飞陈彦彬李晶晶邵宗普
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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