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A quadrate lithium ion cell electrode core and its battery

A technology of lithium-ion batteries and pole cores, which is applied in non-aqueous electrolyte battery electrodes, secondary batteries, active material electrodes, etc., can solve the problems of fast capacity decay, poor cycle performance, slow capacity decay, etc., and achieve improved cycle performance and safety performance

Active Publication Date: 2007-04-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the existing square lithium-ion battery with fast capacity decay and poor cycle performance, and provide a new square lithium-ion battery with slow capacity decay and good cycle performance; another aspect of the present invention An object is to provide a prismatic lithium-ion battery comprising the core

Method used

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  • A quadrate lithium ion cell electrode core and its battery
  • A quadrate lithium ion cell electrode core and its battery
  • A quadrate lithium ion cell electrode core and its battery

Examples

Experimental program
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preparation example Construction

[0057] A conventional positive electrode sheet is prepared by coating a slurry containing positive active material and a binder on a wide-width electrode sheet, drying, rolling and slitting to obtain the positive electrode sheet. Wherein, the solvent containing positive electrode active material and binder slurry is selected from conventional solvents, such as N-methylpyrrolidone (NMP), dimethylformamide (DMF), etc., and the amount of solvent can make the slurry What is necessary is just to apply to the said current collector. Generally, the solvent is used in an amount of 40-90% by weight of the content of the positive active material in the slurry, preferably 50-85% by weight. The drying temperature is generally 50-160°C, preferably 80-150°C. Rolling is to roll the commercially available wide-width pole piece into the required thickness of the positive pole piece, which can vary in a wide range according to the needs of various batteries. The purpose of slitting is to cut ...

Embodiment 1

[0063] Design and make the square battery of the present invention, namely thickness is 4.5 millimeters, and width is 34 millimeters, and height is the square aluminum case lithium ion secondary battery of 50 millimeters.

[0064] (1) Preparation of positive electrode sheet 1

[0065] 100 parts by weight of the positive electrode active material LiCoO 2 , 5 parts by weight of conductive agent acetylene black, and 5 parts by weight of binder PVDF are added to 50 parts by weight of NMP and mixed evenly, and then evenly coated on an aluminum foil with a thickness of 0.02 mm, and then coated evenly Scrape off the positive electrode material at the position not coated with the active material, put it into a vacuum oven, bake and dry it at 120°C, and then press and cut it into positive electrode sheets of 374×44×0.135 mm. The positive active material LiCoO on the positive electrode sheet 2 The content is 6.4 grams.

[0066] (2) Preparation of negative electrode sheet 2

[0067] ...

Embodiment 2

[0081] The inner and outer rings of the positive electrode 1 and the negative electrode 2 are not coated with active materials at the positions where the positive electrode 1 and the negative electrode 2 are curved to form a semicircle. The rest of the manufacturing process of the battery is the same as that of the battery in Example 1.

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Abstract

The invention relates to a pole corn of square lithium battery, and relative battery. Wherein, said pole corn is square, which comprises anode, cathode, and baffle film between them; the anode, cathode, and baffle film are folded into square pole corn, whose two ends are semi circles, while at least one of inner ring, outer ring of anode, inner ring, outer ring of cathode is not coated with active material; therefore, said lithium battery comprises sealing cover plate, frame, pole corn and non-water electrolyte sealed in frame and cover plate. The inventive battery has better circulate property and high safety.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a polar core of a square lithium ion battery and the battery thereof. Background technique [0002] Lithium-ion secondary batteries are widely used as the power source of various electronic devices. At the same time, people have higher and higher performance requirements for batteries. It has a long service time and service life. [0003] Lithium cobalt oxide is generally used as the positive electrode material of lithium-ion batteries, and graphite is used as the negative electrode material, and the capacity of these two materials has certain limitations. Increase the content of positive and negative electrode materials. However, the method of increasing the content of positive and negative electrode materials in order to increase the capacity makes the internal space of the battery, which is originally suitable, more and more crowded, which leads to the inability to accommodate more e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M10/40H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 肖峰孙华军吴声本
Owner BYD CO LTD
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