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Preparation method of surface cladding material of lithium ion battery cathode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of inability to improve the material platform and first-time efficiency, uneven coating, and no effective measures to control the hydrolysis rate, etc., to achieve Improved cycle performance and rate performance, low cost, high discharge platform effect

Inactive Publication Date: 2015-01-28
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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AI Technical Summary

Problems solved by technology

Aluminum salts can effectively improve the cycle performance of the material, but cannot improve the platform and first-time efficiency of the material, and there is no effective measure to control the rate of hydrolysis, which is easy to generate precipitation and make the coating uneven

Method used

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Examples

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Effect test

Embodiment 1

[0021] A surface coating material for the positive electrode material of a lithium ion battery is a titanium dioxide film doped with metal ion manganese; the molar ratio of the metal ion manganese to Ti is 6:1; the positive electrode material of the lithium ion battery is nickel Lithium Cobalt Manganese Oxide.

[0022] A method for preparing a metal ion-doped titanium dioxide-coated lithium-ion battery positive electrode material, comprising the following steps:

[0023] 1) Mixing the titanium source compound with the β-diketone stabilizer to form a solution, or dissolving them in a solvent to form a solution;

[0024] 2) adding a compound containing metal ion manganese or its solution into the solution obtained in step 1), and fully mixing to obtain a sol;

[0025] 3) fully mixing the sol obtained in step 2) with lithium nickel cobalt manganese oxide according to the molar ratio of Ti and lithium nickel cobalt manganese oxide of 0.1:1, then removing the solvent and drying to...

Embodiment 2

[0032] A surface coating material for the positive electrode material of a lithium ion battery is a titanium dioxide film doped with metal ion manganese; the molar ratio of the metal ion manganese to Ti is 7:1; the positive electrode material of the lithium ion battery is nickel Lithium Cobalt Manganese Oxide.

[0033] A method for preparing a metal ion-doped titanium dioxide-coated lithium-ion battery positive electrode material, comprising the following steps:

[0034] 1) Mixing the titanium source compound with the β-diketone stabilizer to form a solution, or dissolving them in a solvent to form a solution;

[0035] 2) adding a compound containing metal ion manganese or its solution into the solution obtained in step 1), and fully mixing to obtain a sol;

[0036] 3) Fully mix the sol obtained in step 2) with nickel-cobalt-lithium manganese oxide according to the molar ratio of Ti and nickel-cobalt-lithium manganese oxide of 0.06:1, then remove the solvent and dry to obtain...

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Abstract

The invention discloses a surface cladding material of a lithium ion battery cathode material and a preparation method thereof. Through a mixed sol preparation mode, the surface of the lithium ion battery anode material (such as LiCoO2) is uniformly coated with a layer of metal ion doped TiO2 thin film. The metal ion doped TiO2 thin film improves the discharge platform, for the first time efficiency and discharge capacity of the anode material, while improving cycle performance and rate performance of anode material under high voltage, also has the advantages of simple preparation process and low cost, and is suitable for industrialized mass production.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and in particular relates to a surface coating material of positive electrode materials of lithium ion batteries and a preparation method of the positive electrode materials of lithium ion batteries coated with the material. Background technique [0002] Lithium-ion battery cathode materials are widely used in notebooks, mobile phones, digital cameras and other electronic equipment and electric vehicles. With the increasing market demand for lithium-ion battery cathode materials, the requirements for material capacity, safety performance and cycle performance are also getting higher and higher. [0003] Lithium cobalt oxide (LiCoO 2 ) as an example, lithium cobalt oxide is currently the most commonly used cathode material for commercial lithium-ion batteries, and its theoretical capacity is 274mAhg -1 , but the actual capacity is far from such a hig...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/1391H01M4/62
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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