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Lithium ion battery capable of being subjected to high-rate charge and discharge and preparation method thereof

A lithium-ion battery, charge and discharge technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of poor charge and discharge performance, low capacity, etc., achieve excellent charge and discharge performance, meet fast charging, good The effect of charging performance

Inactive Publication Date: 2013-03-20
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to overcome the disadvantages of low capacity of lithium-ion batteries in the prior art and poor charging and discharging performance at low temperatures, and provide a high-rate charging and discharging performance, wide temperature range, and excellent low-temperature charging performance. Li-ion battery with long cycle life and high safety

Method used

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  • Lithium ion battery capable of being subjected to high-rate charge and discharge and preparation method thereof
  • Lithium ion battery capable of being subjected to high-rate charge and discharge and preparation method thereof

Examples

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preparation example Construction

[0033] The preparation of the positive electrode sheet includes the following steps: mixing 80-98% (weight ratio) of the positive electrode active material, 1-19% (weight ratio) of the conductive agent, and 1-19% (weight ratio) of the binder to form a slurry; The positive electrode active material is one or both of nickel cobalt lithium manganese oxide and lithium manganate; the conductive agent is one of superconducting carbon black, carbon fiber, graphite flakes, and carbon nanotubes; the binder is One of polyvinylidene fluoride, styrene-butadiene rubber, sodium carboxymethyl cellulose, and carboxypropyl methyl cellulose; the mixed slurry is evenly coated on aluminum foil, dried, rolled, and tableted After that, the positive pole piece is obtained;

[0034] The preparation of the negative electrode sheet includes the following steps: mixing 80-98% (weight ratio) of the negative electrode active material, 1-19% (weight ratio) of the conductive agent, and 1-19% (weight ratio) ...

Embodiment 1

[0040] (1) Mix 80% (weight ratio) of nickel cobalt lithium manganese oxide, 15% (weight ratio) of carbon black, and 5% (weight ratio) of polyvinylidene fluoride into a slurry, and evenly coat it on the aluminum foil , surface density is 15mg / cm 2 , after drying, rolling and sheeting, the positive electrode sheet is obtained;

[0041] (2) Mix 85% (weight ratio) of hard carbon, 5% (weight ratio) of carbon black, and 10% (weight ratio) of polyvinylidene fluoride into a slurry, and evenly coat it on the copper foil. The density is 8mg / cm 2 , after drying, rolling, and sheeting, the negative electrode sheet is obtained;

[0042](3) Preparation of dry cells: After sheet production, the positive and negative electrodes are stacked alternately to form a battery cell, in which the positive and negative electrodes are separated by a diaphragm, and the negative electrode in the feeding area is guaranteed to enclose the positive electrode . The positive and negative tabs are fixed by ...

Embodiment 2

[0049] (1) Mix 80% (weight ratio) of nickel cobalt lithium manganese oxide, 15% (weight ratio) of carbon black, and 5% (weight ratio) of polyvinylidene fluoride into a slurry, and evenly coat it on the aluminum foil , surface density is 15mg / cm 2 , after drying, rolling and sheeting, the positive electrode sheet is obtained;

[0050] (2) Mix 85% (weight ratio) of soft carbon, 5% (weight ratio) of carbon black, and 10% (weight ratio) of polyvinylidene fluoride into a slurry, and evenly coat it on the copper foil. Density 8mg / cm 2 , after drying, rolling, and sheeting, the negative electrode sheet is obtained;

[0051] (3) Preparation of dry cells: After sheet production, the positive and negative electrodes are stacked alternately to form a battery cell, in which the positive and negative electrodes are separated by a diaphragm, and the negative electrode in the feeding area is guaranteed to enclose the positive electrode . The positive and negative tabs are fixed by ultras...

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Abstract

The invention discloses a lithium ion battery capable of being subjected to high-rate charge and discharge and a preparation method thereof. The lithium ion battery capable of being subjected to high-rate charge and discharge comprises a positive pole, a negative pole and a diaphragm, wherein the positive pole comprises the following components in percentage by weight: 80-98% of positive active material, 1-19% of conductive agent and 1-19% of binder; the negative pole comprises the following components in percentage by weight: 80-98% of negative active material, 1-19% of conductive agent and 1-19% of binder; the positive active material includes one or two of Li(NiCoMn)O2 and lithium manganate; the negative active material includes one or two of hard carbon and soft carbon; the conductive agent is one of superconducting carbon black, carbon fiber, crystalline flake graphite and a carbon nanotube; and the binder is one of kynar, butadiene styrene rubber, sodium carboxymethylcellulose and hydroxypropyl / carboxymethyl cellulose. According to the lithium ion battery capable of being subjected to high-rate charge and discharge and the preparation method thereof disclosed by the invention, the lithium ion battery has high-rate charge and discharge characteristics, and is good in charge and discharge characteristics, wide in temperature application range, excellent in low-temperature charge performance, long in cycle life and high in safety.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof, in particular to a lithium ion battery which can be charged and discharged at a large rate and a preparation method thereof. Background technique [0002] With the development of the new energy industry, in the field of power batteries, lithium-ion batteries, as green and environmentally friendly new energy batteries, have increasingly appeared in people's lives. Among lithium-ion batteries, lithium iron phosphate / graphite batteries are the most widely used. However, this system has low battery capacity and poor charge and discharge performance at low temperatures, which cannot meet the requirements of power batteries for high rate and wide temperature range. [0003] The layers of graphite can intercalate various atoms and molecules to form embedded compounds. Therefore, when a lithium-ion battery with graphite as the negative active material is charging, lithium ions ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/505H01M4/525H01M4/62H01M10/058H01M4/139
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 赵珊珊冯树南从长杰王驰伟
Owner TIANJIN ENERGIES
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