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Lithium battery material system, lithium battery assembly and lithium battery

A lithium battery material, lithium battery technology, applied in battery components, battery electrodes, electrode carriers/current collectors, etc., can solve problems such as poor low temperature performance, and achieve excellent performance, low temperature cycle performance, and excellent discharge performance. Effect

Pending Publication Date: 2021-07-23
成都格力钛新能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a lithium battery material system, a lithium battery component and a lithium battery to solve the technical problem of poor low-temperature performance of the lithium battery material system in the prior art

Method used

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  • Lithium battery material system, lithium battery assembly and lithium battery
  • Lithium battery material system, lithium battery assembly and lithium battery
  • Lithium battery material system, lithium battery assembly and lithium battery

Examples

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Embodiment approach

[0029] According to a typical embodiment of the present invention, the positive pole piece is prepared through the following steps: a mechanical mixer is used to prepare positive electrode slurry, and the positive electrode slurry includes positive electrode material, carbon nanotube conductive liquid (commercially available), bonding Agent polyvinylidene fluoride, dispersant N-methylpyrrolidone, use a coating machine to coat the positive electrode slurry on both sides of the positive electrode current collector, dry it in a vacuum oven, slice it, leave a tab at one end, and get the positive electrode after rolling piece.

[0030] According to a typical embodiment of the present invention, the negative electrode sheet is prepared by the following steps: using a mechanical mixer to prepare negative electrode slurry, the negative electrode slurry includes negative electrode material, carbon nanotube conductive liquid, thickener carboxymethyl cellulose Sodium, binder styrene-buta...

Embodiment 1

[0036] The invention is a lithium battery material system, including positive electrode material, negative electrode material, diaphragm, electrolyte, current collector; wherein, the positive electrode material is lithium iron phosphate LiFePO 4 The negative electrode material is soft carbon, and the discharge specific capacity of the negative electrode material is not less than 335mAh / g; the diaphragm material is a polyolefin diaphragm coated with alumina, the thickness is less than 20 microns, and the electrolyte is LiPF with a minimum operating temperature not higher than -45 °C 6Organic solution; the positive current collector is aluminum foil with conductive carbon black coating, the thickness of the coating is not higher than 1 micron, and the thickness of the aluminum foil is not higher than 15 microns; the negative current collector is copper foil with conductive carbon black coating, the thickness of the coating is not Higher than 1 micron, copper foil thickness not hi...

Embodiment 2

[0101] The invention is a lithium battery material system, including positive electrode material, negative electrode material, diaphragm, electrolyte, current collector; wherein, the positive electrode material is lithium iron phosphate LiFePO 4 ; The negative electrode material is artificial graphite, and the discharge specific capacity of the negative electrode material is not less than 335mAh / g; the diaphragm material is a polyolefin diaphragm coated with alumina, the thickness is less than 20 microns, and the electrolyte is LiPF with a minimum operating temperature not higher than -45°C 6 Organic solution; the positive current collector is aluminum foil with conductive carbon black coating, the thickness of the coating is not higher than 1 micron, and the thickness of the aluminum foil is not higher than 15 microns; the negative current collector is copper foil with conductive carbon black coating, the thickness of the coating is not Higher than 1 micron, copper foil thickn...

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Abstract

The invention discloses a lithium battery material system, a lithium battery assembly and a lithium battery. The lithium battery material system comprises a positive electrode material, a negative electrode material, a diaphragm, an electrolyte, a positive electrode current collector and a negative electrode current collector, wherein the positive electrode current collector is an aluminum foil with a conductive carbon black coating, the negative electrode current collector is a copper foil with a conductive carbon black coating, the positive electrode material is lithium iron phosphate LiFePO4, the negative electrode material is one or more of graphite, hard carbon or soft carbon, the diaphragm is a polyolefin diaphragm coated with aluminum oxide, and the electrolyte is a LiPF6 organic solution. According to the technical scheme of the invention, the material system can exert the characteristics of each material through the combination of various battery materials, can be normally used at -30 DEG C, and can reach the absolute discharge temperature at -40 DEG C. Compared with the traditional battery material system, the lithium ion battery manufactured by adopting the system is more excellent in low-temperature performance, excellent in discharge performance and good in low-temperature cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery material system, a lithium battery component and a lithium battery. Background technique [0002] Lithium batteries have been used for decades. With the advancement of science and technology, commodities such as outdoor communications, electric vehicles, and radio tower energy storage have developed rapidly. Behind these rapid developments, higher requirements are placed on lithium-ion battery technology. For example: the rapid development of electric vehicles requires lithium-ion batteries to have higher energy density to increase mileage; lithium-ion batteries are required to have better safety to reduce casualties; better charge-discharge rate performance is required to reduce charging. Time; better low temperature characteristics are required to solve the problem of using electric vehicles in winter; better cycle characteristics are required to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/58H01M4/583H01M4/133H01M4/136H01M4/1393H01M4/1397H01M50/417H01M50/431H01M50/449H01M10/0568H01M10/0525H01M10/0587
CPCH01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/5825H01M4/583H01M4/661H01M4/663H01M4/667H01M10/0525H01M10/0568H01M10/0587H01M2300/0025Y02E60/10Y02P70/50
Inventor 李朋霏蒋世用黄玉元李影李晓昆程海宁温晓磊张永发张俊超吕岩王宁宁
Owner 成都格力钛新能源有限公司