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Lithium ion battery positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials and their preparation, can solve problems such as limited structural stability effects, and achieve the effect of simple and easy methods and easy application

Inactive Publication Date: 2018-08-24
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, experiments have found that the cathode materials prepared in this way reduce the performance of traditional cathode materials to a certain extent, and have limited effect on improving structural stability.

Method used

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  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof
  • Lithium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Coating Li on the surface of traditional cathode particles by atomic layer deposition 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) thin layer: spread 1g of traditional cathode particles on the substrate, and use LATP raw material Li 2 CO 3 、Al 2 o 3 、TiO 2 and NH 4 h 2 PO 4 as the target, in a vacuum of 10 -2 torr, voltage 24V, Ar atmosphere, depositing 28 seconds, 8 seconds, 64 seconds and 12 seconds respectively, different raw materials were deposited on the surface of the traditional positive electrode, and then the deposited powder was taken out and fired at a temperature of 450°C in air for 3 hours, you can get the LCoO 2 (LCO) coated cathode powder with 0.2% LATP.

[0042] The above-mentioned LCO particles coated with LATP on the surface are packed into a metal lithium battery with a liquid electrolyte. Specifically: mix LCO particles coated with LATP on the surface with Super P and binder PVDF at a mass ratio of 8:1:1, add an appropriate amount of solvent NMP...

Embodiment 2

[0046] Coat the LATP thin layer on the surface of traditional cathode particles by precipitation method: disperse 8g of traditional cathode in 300ml of acetonitrile, stir in a beaker for 1 hour, add LATP raw material Li 2 CO 3 (0.011g),Al 2 o 3 (0.0041g), TiO 2 (0.026g) and NH 4 h 2 PO 4 (0.07g), after stirring for 3 hours, stop stirring, add propanol as a settling aid, afterward, the precipitate was vacuum-dried in an oven at 120°C for 12 hours, and finally burned for 3 hours at a temperature of 480°C in air, The positive electrode powder coated with LATP can be obtained.

[0047] The specific steps of preparing the coated positive electrode particles into a liquid electrolyte lithium metal battery and a polymer metal lithium battery are the same as the method for assembling the battery in Example 1, and will not be repeated here.

Embodiment 3

[0049] A thin layer of LATP is coated on the surface of traditional positive electrode particles by pulsed laser deposition: 1g of traditional positive electrode particles is spread on the substrate, and the raw material of LATP is Li 2 CO 3 、Al 2 o 3 、TiO 2 and NH 4 h 2 PO 4 As the target material, turn on the cooling water and pump it to a vacuum degree of 10 - 2 When torr is below, pass O 2 As a protective atmosphere, the number of deposition layers of these raw materials is set to 28 layers, 8 layers, 64 layers and 12 layers respectively. After the deposition is completed, the powder is taken out and burned in the air at a temperature of 450°C for 3 hours. A cathode powder coated with LATP was obtained.

[0050] The specific steps of preparing the coated positive electrode particles into a liquid electrolyte lithium metal battery and a polymer metal lithium battery are the same as the method for assembling the battery in Example 1, and will not be repeated here. ...

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Abstract

The invention relates to a lithium ion battery positive electrode material and a preparation method thereof. According to an embodiment, the lithium ion battery positive electrode can comprise a positive electrode material particle and a solid electrolyte film, wherein the solid electrolyte film is coated on an outer surface of the positive electrode material particle, is a continuous film havingthickness within a range of 1-50 nanometers and comprises an amorphous phase and a crystal phase which coexist, the grain size is within a range of 1-40 nanometers, and no new phase is formed betweenthe solid electrolyte film and the positive electrode particle. By the lithium ion battery positive electrode material, the electrochemical stability can be improved, meanwhile, the problems of volumeexpansion of the positive electrode particle and dissolution-out of transition metal can be prevented, and thus, the lithium ion battery positive electrode material has the advantages of high electrochemical stability, favorable cycle property, high structure stability, good high-voltage performance, high safety and the like.

Description

technical field [0001] The present invention generally relates to the field of new energy, and more particularly relates to a lithium-ion battery anode material with a surface coated with a nanometer solid electrolyte membrane and a preparation method thereof. Background technique [0002] Energy plays an important role in the development of modern society, but traditional fossil fuels are gradually unable to meet the needs of the rapid development of the global economy, and fossil fuels will also cause environmental pollution and greenhouse effects, so there is an urgent need to develop new clean energy , such as: solar, wind, tidal and geothermal energy. However, these energy sources are unstable in time and space and require conversion to be utilized and stored. Therefore, the development of stable clean energy is particularly urgent. [0003] Lithium-ion batteries have the advantages of high energy density, low self-discharge rate, wide operating temperature range, lon...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/1397H01M4/58
CPCH01M4/13H01M4/139H01M4/1397H01M4/5825Y02E60/10
Inventor 杨琪邱纪亮王怡李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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