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A kind of coated modified high-nickel cathode material with controllable specific surface and preparation method thereof

A cathode material and coating material technology, applied in the field of coating modified high-nickel cathode materials, can solve the problems of waste liquid generation, high energy consumption, inability to control the specific surface of the material, etc., to save energy, reduce manufacturing costs, and improve electricity. Effects of chemical properties and water absorption

Active Publication Date: 2021-05-11
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The second technical problem to be solved by the present invention is to provide a preparation method for the above-mentioned high-nickel positive electrode material, which effectively solves the problem that the liquid phase method in the prior art cannot control the specific surface of the material when preparing the cladding layer material, and the process of preparing the cladding layer produces Problems such as waste liquid and high energy consumption during the high-temperature roasting process

Method used

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  • A kind of coated modified high-nickel cathode material with controllable specific surface and preparation method thereof
  • A kind of coated modified high-nickel cathode material with controllable specific surface and preparation method thereof
  • A kind of coated modified high-nickel cathode material with controllable specific surface and preparation method thereof

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Embodiment 1

[0039] The coating modified high-nickel positive electrode material with controllable specific surface in this embodiment, the structure of the high-nickel positive electrode material is selected as LiNi 0.8 Co 0.1 Mn 0.1 O 2 , coated with nano-Al on its surface 2 O 3 .

[0040] The preparation method of the coating modified high-nickel positive electrode material with controllable specific surface described in this embodiment includes the following steps:

[0041] (1) The high-nickel cathode material of the selected structure and the nano-Al 2 O 3 Co-join the physical solid phase dry coating machine to control the nano-Al 2 O 3 Accounted for the total amount of materials (high nickel cathode material and nano-Al 2 O 3 1.00wt% of the total amount), and control the total amount of the material to account for 70% of the filling rate of the physical solid phase dry coating equipment;

[0042] (2) open the described physical solid phase dry method coating equipment, car...

Embodiment 2

[0045] The coating modified high-nickel positive electrode material with controllable specific surface in this embodiment, the structure of the high-nickel positive electrode material is selected as LiNi 0.8 Co 0.1 Mn 0.1 O 2 , coated with nano-Al on its surface 2 O 3 .

[0046] The preparation method of the coating modified high-nickel positive electrode material with controllable specific surface described in this embodiment includes the following steps:

[0047] (1) The high-nickel cathode material of the selected structure and the nano-Al 2 O 3 Co-join the physical solid phase dry coating machine to control the nano-Al 2 O 3 Accounted for the total amount of materials (high nickel cathode material and nano-Al 2 O 3 1.00wt% of the total amount), and control the total amount of the material to account for 90% of the filling rate of the physical solid phase dry coating equipment;

[0048] (2) open the described physical solid phase dry method coating equipment, car...

Embodiment 3

[0051] The coating modified high-nickel positive electrode material with controllable specific surface in this embodiment, the structure of the high-nickel positive electrode material is selected as LiNi 0.6 Co 0.2 Al 0.2 O 2 , coated with nano-TiO on its surface 2 .

[0052] The preparation method of the coating modified high-nickel positive electrode material with controllable specific surface described in this embodiment includes the following steps:

[0053] (1) The high-nickel cathode material of the selected structure and the nano-TiO 2 Co-join the physical solid phase dry coating machine to control the nano-TiO 2 Accounted for the total amount of materials (high nickel cathode material and nano-TiO 2 0.10wt% of the total amount), and control the total amount of the material to account for 60% of the filling rate of the physical solid phase dry coating equipment;

[0054] (2) open the described physical solid phase dry coating equipment, carry out dispersion treat...

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Abstract

The invention belongs to the technical field of power battery electrode materials, in particular to a coating-modified high-nickel positive electrode material with controllable specific surface, and further discloses a preparation method thereof. The preparation method of the coated modified high-nickel positive electrode material with controllable specific surface of the present invention uses a method combining physical solid-phase dry coating and low-temperature drying, and through the compressive stress of the material system during the coating process By controlling the shear stress, the specific surface can be controlled in a lower range, and better electrochemical performance and water absorption can be obtained. The specific surface of the coated modified high-nickel positive electrode material with controllable specific surface of the present invention is controllable, and the specific capacity, rate and cycle performance of the material are excellent, the water content is low, and the total alkali content is low, especially the specific surface is controllable In the lower range, the ability of the coated material to absorb water vapor and carbon dioxide in the air is effectively reduced, and its comprehensive performance as a positive electrode material is improved.

Description

technical field [0001] The invention belongs to the technical field of power battery electrode materials, in particular to a coating modified high nickel positive electrode material with controllable specific surface, and further discloses a preparation method thereof. Background technique [0002] Rechargeable lithium-ion secondary batteries have been widely used in modern communications due to their high specific energy, long charge-discharge life, no memory effect, low self-discharge rate, fast charging, no pollution, wide operating temperature range, safety and reliability. , portable electronics and hybrid vehicles. Especially in recent years, with the continuous development of the new energy vehicle industry, higher requirements have been placed on the power lithium-ion secondary battery. Studies have shown that cathode materials are the key factor limiting the performance improvement of power lithium batteries. The current commercial power battery cathode materials ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 李宁王刘振徐国峰杨娟玉李翔王建涛庞静
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD