Lithium ion battery with high specific power and preparation method for same

A lithium-ion battery, high specific power technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of failing to improve the working voltage and specific power of lithium-ion batteries, achieve good storage performance, prevent lithium Decomposition of salt, effect of reducing internal resistance

Active Publication Date: 2012-02-22
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The negative electrode active material is graphite, and the electrolyte is a conventional organic electrolyte. Although the two mixed positive electrode materials can complement each other, they cannot improve the working voltage and specific power of existing lithium-ion batteries.

Method used

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  • Lithium ion battery with high specific power and preparation method for same
  • Lithium ion battery with high specific power and preparation method for same
  • Lithium ion battery with high specific power and preparation method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The high specific power lithium-ion battery of the present embodiment is designed according to the rated capacity of a single battery of 6.5Ah, such as figure 1 Shown, its concrete preparation method step is as follows:

[0030] Step A: the LiNi containing 95wt% 0.5 mn 1.5 o 4, 1.5wt% of acetylene black, 1.5wt% of conductive carbon black, 4wt% of polyvinylidene fluoride as a solute, N-methylpyrrolidone as a solvent into a paste-like positive electrode slurry, with 15 μm thick aluminum foil as Current collector, the positive electrode slurry is coated on the front and back of the aluminum foil and dried at 120°C for 8 hours to make a pole piece, and then the pole piece is rolled, die-cut or sheared to make a positive electrode. The compacted density of the electrode is 3.6g / cm 3 ;

[0031] Step B: 84wt% carbon-coated nano-silicon composite material, 7wt% conductive carbon black and 9wt% polyvinylidene fluoride are used as solutes, and N-methylpyrrolidone is used as ...

Embodiment 2

[0037] The high specific power lithium-ion battery of the present embodiment is designed according to the rated capacity of the single battery 6Ah, such as figure 1 Shown, its concrete preparation method is as follows:

[0038] Step A: LiNi containing 93 wt% coated carbon 0.45 Cr 0.05 mn 1.5 o 4 , 1.5wt% of acetylene black, 2wt% of conductive carbon black, 3.5wt% of polyvinylidene fluoride as solute, N-methylpyrrolidone as a solvent into paste-like positive electrode slurry, with 15 μm thick aluminum foil as Current collector, the positive electrode slurry is coated on the front and back of the aluminum foil and dried at 120°C for 8 hours to make a pole piece, and then the pole piece is rolled and sheared to make a positive electrode. The pressure of the positive electrode is Solid density is 3.4g / cm 3 ;

[0039] Step B: 84wt% of mesocarbon microspheres, 7wt% of conductive carbon black and 9wt% of polyvinylidene fluoride are used as solutes, and N-methylpyrrolidone is us...

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Abstract

The invention discloses a lithium ion battery with high specific power and a preparation method for the same, which belong to the field of lithium ion batteries. The lithium ion battery with high specific power is formed by packaging a positive electrode, a gel polymer electrolyte membrane, a polyethylene porous membrane, a gel polymer electrolyte membrane and a negative electrode sequentially by means of stacking or coiling. Each gel polymer electrolyte membrane is formed by the steps of enabling polymers to dissolve into dissolvent, adding electrolytic solution containing lithium salt and organic solvent prior to mixing, and coating the mixed solution on the polyethylene porous membrane or two surfaces of the positive electrode and the negative electrode. The specific power of the lithium ion battery can be effectively increased, and the lithium ion battery with high specific power is higher in safety performance, excellent in storage performance and long in cycle life. The preparation method for the lithium ion battery with high specific power is simple in manufacturing process and low in requirements on the environment, and can be widely applied to the field of manufacturing of lithium ion batteries with high specific power.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof, in particular to a high specific power lithium ion battery and a preparation method thereof. Background technique [0002] With social development and scientific and technological progress, people's demand for energy is increasing. Compared with traditional lead-acid batteries, Ni-Cd, and Ni-MH batteries, lithium-ion batteries are environmentally friendly, high specific energy (140Wh / kg), high voltage platform, long cycle life, small self-discharge, and no memory Effect and other characteristics, it has been widely used in military and civilian fields, including 3G electronic products, various electric tools, etc., and is expected to be used as a power source in the field of hybrid vehicles and electric vehicles. [0003] The current commercial lithium-ion battery cathode material is mainly LiCoO 2 , LiMn 2 o 4 、LiFePO 4 , NCM (Lithium Nickel Cobalt Manganese Oxygen) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M4/505H01M4/38H01M4/525H01M10/0565
CPCY02E60/10Y02P70/50
Inventor 刘三兵刘志远刘云建
Owner CHERY AUTOMOBILE CO LTD
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