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Lithium battery cell composite coated positive electrode material, preparation method thereof, and lithium ion battery

A technology of lithium ion battery and positive electrode material, applied in the field of new energy battery, can solve the problems of undisclosed, increased preparation cost of lithium battery, difficult operation and the like

Pending Publication Date: 2020-09-01
WUHU ETC BATTERY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used to make lithium-sulfur batteries in negative electrode materials, and it needs to be carried out in an argon-protected glove box, which is difficult to operate and greatly increases the production cost of lithium batteries.
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Method used

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  • Lithium battery cell composite coated positive electrode material, preparation method thereof, and lithium ion battery
  • Lithium battery cell composite coated positive electrode material, preparation method thereof, and lithium ion battery
  • Lithium battery cell composite coated positive electrode material, preparation method thereof, and lithium ion battery

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Example Embodiment

[0035] Example 1

[0036] The preparation method of lithium battery core composite coated positive electrode material (coated positive electrode NCM523) includes the following steps:

[0037] 1) Add the commercially available lithium nickel cobalt manganate 523 material matrix to the ethanol solvent, add ethyl silicate, lithium dihydrogen phosphate and magnesium dihydrogen phosphate in sequence, solid mass ratio: nickel cobalt manganese lithium 523 material matrix : Ethyl silicate: Lithium dihydrogen phosphate: Magnesium dihydrogen phosphate = 85%: 2%: 5%: 8%; Solid content: 60%; Stir in a constant temperature water bath, where the temperature of the water bath is controlled within the range of 80±5°C, The rotation speed is 1000 rpm, and the stirring time is controlled at 150 min to obtain a mixed solution A.

[0038] 2) Put the above solution A in a centrifuge for centrifugation, with a centrifugal speed of 10,000 rpm, and a centrifugal time of 60 minutes, to obtain a solid-liquid ...

Example Embodiment

[0049] Example 2

[0050] The preparation method of lithium battery core composite coated positive electrode material (coated positive electrode NCM811) includes the following steps:

[0051] 1) Put the purchased commercial lithium nickel cobalt manganese oxide 811 material into the acetone solvent, and add ethyl silicate, lithium hydroxide, and aluminum dihydrogen phosphate in sequence. Among them, the mass ratio, the lithium nickel cobalt manganese oxide 811 material: Ethyl silicate: Lithium hydroxide: Aluminum dihydrogen phosphate = 90%: 1%: 4%: 5%, solid content: 72%, and then stir at 120°C in a water bath at constant temperature for 180 minutes at a speed of 1200 rpm to obtain a mixture Solution D;

[0052] 2) Put the above solution D in a centrifuge, centrifuge at a speed of 20,000 rpm, and centrifuge for 60 minutes to obtain a solid-liquid mixture E with a solid content of 85%;

[0053] 3) Use a mullite crucible to hold solution E and put it into the muffle furnace. The load c...

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Abstract

The invention provides a lithium battery cell composite coated positive electrode material, a preparation method thereof, and a lithium ion battery. The improvement of material performance can be realized by introducing a lithium source, aluminum, magnesium or titanium element into a nickel cobalt lithium manganate positive electrode material. By using an assistant containing a silicon-based additive, excellent bonding performance between the material and a coating agent can be realized. Through coating by the method, the stable and reliable material can be obtained and is applied to the manufacturing process of the lithium ion battery. Not only are the electrical properties (including cycle performance) of the battery improved, but also the safety performance of the battery cell is improved, and the improvement effect on needling is particularly remarkable.

Description

technical field [0001] The invention belongs to the field of new energy batteries, in particular to the field of lithium batteries, in particular to a lithium battery core composite coated positive electrode material and a preparation method thereof, and a lithium ion battery. Background technique [0002] As a green battery, lithium-ion batteries have the advantages of high energy density, high working voltage, high safety performance and long service life. Lithium-ion batteries are extremely vulnerable to safety tests such as overcharging, extrusion, and acupuncture. A short circuit generates an electric spark and ignites the electrolyte to cause an explosion, which poses a great potential safety hazard. Among them, the release of oxygen from the positive electrode material, especially the nickel-cobalt lithium manganese oxide material, is the most important factor leading to the potential safety hazard. [0003] The preparation method of the lithium metaaluminate-coated a...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/42
CPCC01G53/44H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/4235C01P2006/40Y02E60/10
Inventor 王灵君张绍清晏子聪
Owner WUHU ETC BATTERY LTD
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