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Positive electrode material directly coated with solid electrolyte and technological method thereof

A solid electrolyte and positive electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as interface complexity

Inactive Publication Date: 2018-10-19
TIANJIN XINDONGYUAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the complicated interface between the coated positive electrode material and the electrolyte, the present invention proposes to use a solid electrolyte material to directly coat and modify the surface of the positive electrode material

Method used

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  • Positive electrode material directly coated with solid electrolyte and technological method thereof
  • Positive electrode material directly coated with solid electrolyte and technological method thereof
  • Positive electrode material directly coated with solid electrolyte and technological method thereof

Examples

Experimental program
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Effect test

Embodiment example 1

[0023] Implementation case 1: Take the positive electrode material LiNi 0.8 co 0.1 mn 0.1 o 2 0.99kg, 0.01kg of coating material (0.005kg of polymer solid electrolyte material and 0.005kg of ultra-fine nano-carbon particles), put into a high-speed mixer, and pre-mixed at 1000rpm for 20min. Put the obtained premix into the fusion coating machine, and run it at 2000rpm for 30min. The coated cathode material was put into a tube furnace, and annealed at 100° C. for 2 h in a nitrogen blanketing environment.

Embodiment example 2

[0024] Implementation case 2: Take the positive electrode material LiCoO 2 0.93kg, 0.07kg of coating materials (0.03kg of LATP and 0.04kg of sucrose), put into a high-speed mixer, and mix at 700rpm for 20min. Put the obtained premix into the fusion coating machine, and run it at 2500rpm for 30min. The coated positive electrode material was put into a tube furnace, and annealed at 400° C. for 2 h in a nitrogen-covered environment.

Embodiment example 3

[0025] Implementation case 3: Take the positive electrode material LiFePO 4 0.95kg, 0.05kg of coating material (0.02kg of polymer-based solid electrolyte material and 0.03kg of carbon black), put into a high-speed mixer, and pre-mix at 700rpm for 20min. Put the obtained premix into the fusion coating machine, and run it at 2000rpm for 30min. The coated cathode material was put into a tube furnace, and annealed at 100° C. for 2 h in a nitrogen blanketing environment.

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PUM

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Abstract

The invention provides a technological method for directly performing coating modification on a positive electrode material by a solid electrolyte material, and the positive electrode material obtained thereby. In order to improve the electronic conductivity characteristic of the positive electrode material and improve the comprehensive performance of the coating modification on the positive electrode material by the solid electrolyte material, the invention uses a carbon material and the solid electrolyte material for performing composite coating modification on the positive electrode material. Firstly, the positive electrode material, the carbon material and the solid electrolyte material are put into a high-speed mixer according to a certain ratio and mixed uniformly, and then a mixtureis put into a mechanical fusion coating machine for fusion coating. The positive electrode material after the coating modification has greatly improved ratio characteristic and cycle characteristic.

Description

field of invention [0001] The invention relates to a positive electrode material of a lithium battery and a process method thereof. Specifically, it relates to a positive electrode material directly coated with a solid electrolyte and a process method thereof. Background technique [0002] At present, the cathode materials commonly used in the secondary lithium battery industry are LiCoO 2 , LiMnO 2 , LiNiO 2 , LiMn 2 o 4 、LiFePO 4 , NCM, NCA, etc. These materials have their own characteristics: LiCoO 2 It is mainly used in the 3C industry, and the application scenario requires it to show good cycle characteristics and safety performance under high voltage. However, when the voltage is increased to 4.5V, LiCoO 2 Pulverization occurs on the particle surface, resulting in a sharp drop in cycle characteristics. LiMn 2 o 4 When charging and discharging at high temperature (greater than 55°C), the specific capacity will decline sharply. LiFePO 4 At present, the posit...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/364H01M4/505H01M4/525Y02E60/10
Inventor 左连勇
Owner TIANJIN XINDONGYUAN SCI & TECH