Positive electrode surface modification material and preparation method thereof

A technology of surface modification and positive electrode materials, applied in the direction of positive electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of increased charge transfer resistance, low lithium ion conductivity, and affecting material rate performance, so as to achieve accelerated transfer and deposition The effect of low difficulty and improved cycle stability

Pending Publication Date: 2022-04-22
SHANGHAI TECH UNIV
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Problems solved by technology

Although coating the chemical stability layer on the surface of the positive electrode material can improve the cycle stability of the positive electrode to a certain extent, due to its low lithium ion conductivity, it will increase the charge transfer resistance at the interface between the material and the electrolyte, which seriously affects the stability of the material. rate performance

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  • Positive electrode surface modification material and preparation method thereof
  • Positive electrode surface modification material and preparation method thereof
  • Positive electrode surface modification material and preparation method thereof

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preparation example Construction

[0046] The second aspect of the present invention provides the preparation method of the positive electrode surface modification material described in the first aspect of the present invention, comprising:

[0047] 1) Coating the surface of the positive electrode material to obtain a chemically inert layer;

[0048] 2) Annealing the chemically inert layer in step 1) to obtain a positive electrode surface modification material having both a doped layer and a coating layer.

[0049] In the preparation method of the positive electrode surface modification material provided by the present invention, the step 1) is to coat the surface of the positive electrode material to obtain a chemically inert layer. Specifically for this application, the coating method may be, for example, an atomic layer deposition method. Atomic layer deposition (ALD) is an advanced cladding technique that enables the deposition of uniform conformal thin films on high surface area and complex shaped substra...

Embodiment 1

[0077] 1. Preparation of cathode surface modification materials

[0078] 1) The atomic layer deposition coating of the chemically inert layer can be realized by T-ALD-100Asystem (KE-MICRO) and Yunmao GT10 powder ALD system atomic layer deposition equipment.

[0079] The ternary material LiNi 0.6 co 0.2 mn 0.2 o 2 Place the powder or electrode in the sample barrel to preheat 150°C and mechanically stir or vibrate for 30 minutes at the same time, and then alternately pass through the chemical precursor source (tetradimethylamino zirconium and deionized water) for one or more Alternate deposition of thin films, zirconium tetradimethylamide and deionized water will react to form zirconia. By controlling the number of atomic layer deposition circles to be 5, the nanoscale thickness precision control of the chemically inert layer can be realized. The obtained surface-modified chemically inert layer has a thickness of 1.2nm and accounts for 0.13% by mass of the positive electrod...

Embodiment 2

[0094] The chemically inert layer (initial cladding layer) is 1.2nm. Compared with Example 1, the difference is that the annealing temperature is reduced to 300° C., the doping / coating ratio of the final product is reduced, and the chemically inert layer (initial cladding layer) 25% of the metal elements in the layer) enter the ternary material to form a doped layer, and the doping elements in the doped layer account for 5.7% by mass of the doped layer. The average thickness of the remaining cladding layer after annealing was 0.9 nm.

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Abstract

The invention relates to the technical field of energy materials, in particular to a positive electrode surface modification material and a preparation method thereof. The positive electrode surface modified material comprises a positive electrode material part, a doping layer and a coating layer which are sequentially superposed; the positive electrode material part comprises a positive electrode material; the doping layer comprises a positive electrode material and a doping element doped in the positive electrode material. A part of the chemical inert layer is converted into surface doping, so that migration of lithium ions at an interface can be accelerated. Therefore, the synergistic effect of coating and doping can greatly improve the cycling stability and rate capability of the ternary material at the same time.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a positive electrode surface modification material and a preparation method thereof. Background technique [0002] Ternary material LiNi x co y mn z o 2 (x+y+z=1) has a layered structure, which can realize the intercalation and deintercalation of lithium ions. Compared with lithium cobalt oxide, it has the advantages of high energy density and low cost, and is currently a popular cathode material for lithium-ion batteries in the industry. [0003] In the prior art, coating the surface of the ternary material with a chemically stable film layer (such as oxide, fluoride, phosphate, etc.) can reduce the chemical and electrochemical stability of the material surface to a certain extent, thereby improving the ternary material surface to a certain extent. Material safety and cycle life. Although coating the chemical stability layer on the surface of the positive electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/485H01M4/58H01M4/02
CPCH01M4/0471H01M4/582H01M4/485H01M2004/028Y02E60/10
Inventor 谢琎包文达
Owner SHANGHAI TECH UNIV
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