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Material system of lithium battery

A lithium battery material and system technology, applied in secondary batteries, battery electrodes, battery pack components, etc., can solve problems such as poor battery material system performance, achieve high energy density and power density, high battery safety performance, Good cycle performance

Inactive Publication Date: 2017-11-14
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a lithium battery material system, including positive electrode material with high capacity, negative electrode material with stable electrochemical performance, separator with high safety, low temperature electrolyte with excellent properties and high conductivity current collector; through the combination of five battery materials, the characteristics of each material can be used to solve the problem of poor performance of the traditional battery material system

Method used

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  • Material system of lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Positive electrode sheet production: use a mechanical mixer to prepare lithium battery positive electrode slurry, which includes the positive active material LiNi 0.5 co 0.2 mn 0.3 o 2 , Conductive agent acetylene black, binder polyvinylidene fluoride, dispersant N-methylpyrrolidone. Use a coating machine to evenly coat the positive electrode slurry on both sides of the aluminum foil with a graphene coating of 1 micron (the thickness of the aluminum foil is 13 microns), and after drying in a vacuum oven, use a slicer to punch out a positive electrode sheet with a specific length and width. Take out the tab to get the positive pole piece.

[0013] Negative electrode sheet production: use a mechanical mixer to prepare battery negative electrode slurry, which includes negative active material artificial graphite, conductive agent acetylene black, binder polyvinylidene fluoride, and dispersant N-methylpyrrolidone. Use a coating machine to evenly coat the negative electr...

Embodiment 2

[0016] Positive electrode sheet production: use a mechanical mixer to prepare lithium battery positive electrode slurry, which includes the positive active material LiNi 0.6 co 0.2 mn 0.2 o 2 , Conductive agent acetylene black, binder polyvinylidene fluoride, dispersant N-methylpyrrolidone. Use a coating machine to evenly coat the positive electrode slurry on both sides of the aluminum foil with a graphene coating of 0.5 microns (the thickness of the aluminum foil is 12 microns). Take out the tab to get the positive pole piece.

[0017] Negative electrode sheet production: use a mechanical mixer to prepare battery negative electrode slurry, which includes negative active material hard carbon, conductive agent acetylene black, binder polyvinylidene fluoride, and dispersant N-methylpyrrolidone. Use a coating machine to evenly coat the negative electrode slurry on both sides of the copper foil (the thickness of the copper foil is 8 microns). After drying in a vacuum oven, use...

Embodiment 3

[0020] Positive electrode sheet production: use a mechanical mixer to prepare lithium battery positive electrode slurry, which includes the positive active material LiNi 0.8 co 0.1 Al 0.1 o 2 , Conductive agent acetylene black, binder polyvinylidene fluoride, dispersant N-methylpyrrolidone. Use a coating machine to evenly coat the positive electrode slurry on both sides of the aluminum foil with a graphene coating of 0.8 microns (the thickness of the aluminum foil is 10 microns). Take out the tab to get the positive pole piece.

[0021] Negative electrode sheet production: use a mechanical mixer to prepare battery negative electrode slurry, which includes negative active material hard carbon, conductive agent acetylene black, binder polyvinylidene fluoride, and dispersant N-methylpyrrolidone. Use a coating machine to evenly coat the negative electrode slurry on both sides of the copper foil (the thickness of the copper foil is 9 microns). After drying in a vacuum oven, use...

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Abstract

The invention relates to a material system of a lithium battery. The material system is characterized in that a positive-pole material is lithium-nickel-cobalt oxide LiNixCoyNzO2 with high capacity (x is greater than or equal to 0.5 and smaller than or equal to 0.8, y+z is greater than or equal to 0.2 and smaller than or equal to 0.5, and N is Mn or Al); a negative-pole material is either artificial graphite or hard carbon and has a discharging specific capacity not lower than 335mAh / g; a diaphragm material is a Al2O3 or SiO2 ceramic modified polyolefin diaphragm and has the thickness smaller than 30 microns; an electrolyte is a LiPF6 organic solution, of which the lowest service temperature is not higher than -25 DEG C; current collectors comprises a positive pole current collector and a negative pole current collector, and the positive pole current collector is an aluminum foil with a graphene coating. The material system has the negative-pole material with stable electrochemical properties, the diaphragm with high safety, the low-temperature electrolyte with outstanding properties and the current collectors with high electric conductivity; through combining the five battery materials and exerting characteristics of all the materials, the problem that the traditional battery material systems are poor in performance is solved.

Description

technical field [0001] The invention relates to a lithium battery material system and belongs to the technical field of lithium ion batteries. Background technique [0002] Lithium batteries have been used for decades. With the advancement of science and technology, products that use lithium-ion batteries as power sources, such as mobile phones and electric vehicles, have developed rapidly. Behind the rapid development of these commodities, higher requirements are placed on lithium-ion battery technology. For example: the rapid development of electric vehicles requires lithium batteries to have higher energy density to increase the mileage of the vehicle; lithium batteries are required to have better safety to reduce casualties; lithium batteries are required to have better rate performance , to reduce charging time; require lithium batteries to have better low-temperature characteristics to solve the problem of electric vehicles in winter; require lithium batteries to hav...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/505H01M4/525H01M4/587H01M2/16H01M4/66H01M10/0585H01M50/411H01M50/431
CPCH01M4/505H01M4/525H01M4/587H01M4/661H01M10/0525H01M10/0585H01M50/431H01M50/411Y02E60/10Y02P70/50
Inventor 姜涛陈慧明米新艳张克金
Owner CHINA FIRST AUTOMOBILE
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