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Lithium-ion battery cathode material coated with special composition 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 the problems of time-consuming and labor-intensive post-processing, long processing time, and high processing costs, and achieve time-saving and cost-saving, uniform and complete coating, Residual Alkali Reduction Effect

Active Publication Date: 2022-05-13
扬州海吉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These wet technologies have high cost, complicated process, long processing time, time-consuming and labor-intensive post-processing, and there are also problems such as safety, solvent recovery, and environmental protection. It is difficult to implement, high in cost, and difficult to apply in practice.

Method used

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  • Lithium-ion battery cathode material coated with special composition and preparation method thereof
  • Lithium-ion battery cathode material coated with special composition and preparation method thereof

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preparation example Construction

[0053] An embodiment of the present invention provides a method for preparing a lithium-ion battery positive electrode material coated with a special component, which includes the following steps:

[0054] Step 1, providing core particles of at least one component, each component material is selected from one of the positive electrode active materials of lithium batteries. Cathode active materials include xLi 2 MO 3 ·(1-x)LiMO 2 、LiM 2 o 4 、LiMPO 4 , wherein, 0≤x<1, M is one or more metal elements with an atomic number of 6 or more, more preferably, M is selected from Co, Ni, Mn, V, Fe, Cr, Al;

[0055] Step 2, material encapsulation process: Process the specifically synthesized solid organic molecular material A into a shape with a large surface area, or block or flake, or into thin strips, granules, powders, or mixed shapes and place it in the heating chamber C Inside, thermal decomposition, wherein, the heating temperature depends on the material used, generally 100-3...

Embodiment 1

[0060] Lithium nickel cobalt manganese oxide LiNi 0.83 co 0.12 mn 0.05 o 2 The positive electrode material is about 50g, and the surface coating process is as follows: mix 1g of granular foamed synthetic rubber with 1g of granular synthetic polytrifluoropropylmethylpolysiloxane, place it in a temperature-controlled heating chamber, and heat to 250- Specific gas-phase organic components are obtained at 350°C, and the gas-phase organic components are introduced into the positive electrode material to react for about 360-720s. After cooling, the lithium-ion battery positive electrode material coated with special components is obtained.

[0061] The electrochemical performance test of the material is tested at 25°C with the blue electric battery test system, the test voltage range is 2.8V ~ 4.3V, the specific capacity test condition: 0.2C charge 1C discharge once, the discharge specific capacity of the material at 1C rate It was 189mAh / g, the pH value of the material dropped fr...

Embodiment 2

[0063] Lithium nickel cobalt manganese oxide LiNi 0.83 co 0.12 mn 0.05 o 2 The positive electrode material is about 50g, and the surface coating process is as follows: take 1g of granular synthetic copolyfluororubber and mix with about 1g of synthetic polymethylphenylsiloxane, wherein the phenyl content of synthetic polymethylphenylsiloxane is 15- 20mol%, placed in a temperature-controlled heating chamber, heated to 250-350°C to obtain a specific gas-phase organic component, introduced into the gas-phase organic component and reacted with the positive electrode material for about 360-720s, and obtained a lithium-ion battery positive electrode coated with a special component after cooling Material.

[0064] The electrochemical performance test of the material is tested at 25°C with the blue electric battery test system, the test voltage range is 2.8V ~ 4.3V, and the specific capacity test condition: 0.2C charge 1C discharge once. The specific discharge capacity of the mater...

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Abstract

The invention relates to a lithium ion battery cathode material coated with a special component and a preparation method thereof, and relates to a lithium ion battery material coated functional material with a special component and a preparation method thereof. The lithium battery positive electrode materials mentioned here include lithium cobaltate, lithium manganate, lithium manganese nickel cobalt manganate, lithium iron phosphate, lithium nickel cobalt aluminate and the like. The invention not only solves the problem that the hygroscopic lithium-ion battery positive electrode material will absorb moisture and carbon dioxide in the air when it is stored, transported and used under normal temperature and pressure atmospheric environment or high humidity conditions, but also effectively reduces environmental moisture and carbon dioxide. The reaction with free lithium on the surface and the side reaction between trace water and electrolyte improve the safety, cycleability and storage performance of lithium-ion battery cathode materials in the battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a lithium-ion battery cathode material coated with a special component function and a preparation method thereof. The lithium battery positive electrode materials mentioned here include lithium cobaltate, lithium manganate, lithium manganese nickel cobalt manganate, lithium iron phosphate, lithium nickel cobalt aluminate and the like. Background technique [0002] Due to its high voltage, high energy density, long cycle life, no memory effect, good safety performance and environmental protection characteristics, lithium-ion batteries are considered to be the most promising, and are therefore widely used in laptops, mobile phones, In a wide range of fields from power tools to electric vehicles. But existing lithium-ion battery technology is not yet able to meet the growing demand for high-performance energy. As an important part of the lithium batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525C01G53/00
CPCH01M4/62H01M10/0525C01G53/50C01P2006/40Y02E60/10
Inventor 周健
Owner 扬州海吉科技有限公司
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