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Lithium ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, which is applied in the manufacture of electrolyte batteries, electrodes, secondary batteries, etc., can solve the problems of unfavorable industrial application, complicated preparation process, and many raw materials, and achieve low cost, simple steps, and improved conductivity. rate effect

Active Publication Date: 2019-08-30
湖南电将军新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned patent, electrolytic manganese dioxide, lithium carbonate, and chromium trioxide are sintered and sieved multiple times, then mixed and sintered with lithium fluoride, and finally coated with liquid. Many raw materials are used and the preparation process is complicated. High cost, not conducive to industrial application

Method used

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  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof
  • Lithium ion battery and preparation method thereof

Examples

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preparation example Construction

[0039] The invention discloses a preparation method of a lithium ion battery, comprising the following steps:

[0040] By putting the primary clay or bauxite into the pipeline iron remover, the magnetic substances in the primary clay or bauxite are removed to obtain secondary clay or secondary bauxite;

[0041] The secondary clay or secondary bauxite and the positive electrode material are mixed and ground in a mass ratio of 0.5-10:90-100 to obtain a mixture; the positive electrode material is selected from lithium manganate, lithium iron phosphate, lithium-rich manganese-based positive electrode materials, cobalt One or more of Lithium Oxide positive electrode material, nickel-cobalt-manganese and nickel-cobalt-aluminum ternary positive electrode material;

[0042] The mixture is sintered at 600-1000°C to obtain the positive electrode composite material, the heating rate of sintering is 5-10°C / min, the temperature range of heat preservation is 600-1000°C, and the sintering ti...

Embodiment 1

[0051] The preparation method of the lithium ion battery that this specific embodiment provides, comprises the steps:

[0052] Magnetic separation treatment of raw clay: put the raw clay in the pipeline iron remover to remove Fe, Fe 2 o 3 , NiO and other magnetic substances, the treatment time is 0.5h, and the secondary clay is obtained. Lithium manganese oxide was selected as the positive electrode material. 1.6g of secondary clay and 45g of lithium manganate were mixed and ball milled in a SPEX 8000 ball mill for 12 hours to obtain a mixture. The mass ratio of secondary clay to lithium manganate was 3.5:100. The mixture was placed in a tube furnace for air sintering for 8 h. The temperature control of the sintering includes a heating process and a constant temperature process, the heating rate of the heating process is 5°C / min, and the temperature control of the constant temperature process is 800°C. After the sintering is completed, the positive electrode composite mater...

Embodiment 2

[0063] The difference between Example 2 and Example 1 is that the mass ratio of secondary clay to lithium manganate is 0.5:100.

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Abstract

The invention relates to a lithium ion battery. The lithium ion battery comprises a cathode plate, an anode plate, a diaphragm, a shell and electrolyte. The cathode plate comprises a cathode current collector and a cathode active layer coating the surface of the cathode current collector, the cathode active layer comprises a cathode composite material, a conductive agent and a binder A which the mass ratio of 90-99:0.5-5:0.5:5, the cathode composite material comprises a cathode material and a secondary clay or a secondary bauxite coating layer coating the cathode material, and the diaphragm isa composite diaphragm comprising a diaphragm substrate and a bauxite layer. The present invention further provides a preparation method of a lithium ion battery. The lithium ion battery provided by the invention is rich in mineral ions such as aluminum, silicon, magnesium and the like, can effectively improve the rate capability, the cycle performance, the low-temperature performance and the safety performance of the battery, improves the electronic / ionic conductivity of the battery material, improves the heat resistance and the liquid absorption rate of the diaphragm, improves the interfacecombination between the diaphragm and the cathode plate and the anode plate, and reduces the interface resistance between the electrolyte and the electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high working voltage, long cycle life, low self-discharge rate, and no memory effect, and are widely used in the field of electronic equipment. With the continuous improvement of technology, lithium-ion batteries have been applied to more fields, such as aerospace, automobiles, field devices, etc. At the same time, higher requirements are put forward for lithium-ion batteries, such as higher energy density, rate performance and cycle performance. Researchers are also constantly developing new materials or making further compounding, doping, coating and other modifications to existing materials. Such as the patent "LiAlO 2 The preparation method of coated spinel lithium manganese oxide positive electrode material"...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M2/16H01M2/14H01M4/131H01M4/136H01M4/36H01M4/62H01M4/505H01M4/525H01M4/485H01M4/58H01M4/1391H01M4/1397H01M4/04H01M10/058
CPCH01M4/0404H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/62H01M10/0525H01M10/058H01M50/403H01M50/431H01M50/449Y02E60/10Y02P70/50
Inventor 贺思如杨金林王仲明吴吉强其他发明人请求不公开姓名
Owner 湖南电将军新能源有限公司
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