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Electrode plate of lithium ion cell and lithium ion cell with the same

A lithium-ion battery, pole piece technology, applied in the direction of electrode carrier/current collector, non-aqueous electrolyte battery electrode, secondary battery, etc. problem, to achieve the effect of eliminating the internal short circuit of the battery and improving the safety

Inactive Publication Date: 2006-07-19
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] An obvious shortcoming of the existing pole piece is that the lithium-ion battery including the pole piece has a high short-circuit rate, which seriously affects the qualification rate of the battery and increases the total production cost of the battery

Method used

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  • Electrode plate of lithium ion cell and lithium ion cell with the same
  • Electrode plate of lithium ion cell and lithium ion cell with the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] A conventional method for preparing a positive electrode sheet includes coating a slurry containing a positive electrode active material and a binder on a wide-width electrode sheet, drying, rolling and slitting to obtain a positive electrode sheet. Wherein, the solvent of the slurry containing the positive electrode active material and the binder can be selected from conventional solvents, such as N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide One or more of (DEF), dimethyl sulfoxide (DMSO), tetrahydrofuran (THF), water and alcohols. It is sufficient that the amount of the solvent is such that the slurry can be coated on the current collector. Generally, the solvent is used in an amount such that the content of the positive electrode active material in the slurry is 40-90% by weight, preferably 50-85% by weight. The drying temperature is generally 50-160°C, preferably 80-150°C. The purpose of rolling is to roll the commercially available wide-wi...

example 1

[0027] This example illustrates the pole piece and lithium ion battery provided by the present invention.

[0028] (1) Preparation of positive pole piece

[0029] 100 parts by weight positive electrode active ingredient LiCoO 2, 4 parts by weight of the binder PVDF, and 4 parts by weight of the conductive agent acetylene black were added to 40 parts by weight of NMP, and then stirred in a vacuum mixer to form a stable and uniform dispersed positive electrode slurry. The slurry is evenly coated on a wide aluminum foil (500 mm wide, 0.2 mm thick), then dried at 120 ° C, rolled on a rolling mill to form a pole piece with a thickness of 0.1 mm, and then cut The machine is cut into 433 × 44 × 0.1 mm positive pole piece, and the four corners of the positive pole piece are cut into such as figure 2 The curve angle shown is a rounded corner, and the radius of the rounded corner is 3mm. 2 The content is 7.5 grams.

[0030] (2) Preparation of negative pole piece

[0031] 100 parts...

example 2

[0037] This example illustrates the pole piece and lithium ion battery provided by the present invention.

[0038] Pole sheet and lithium-ion battery are prepared according to the method of example 1, and difference is that the four corners of positive electrode sheet and negative electrode sheet are all cut into such as figure 2 The curved corner shown is a rounded corner, and the radius of the rounded corner is 18 mm. A total of 20,000 identical batteries were prepared.

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Abstract

The invention relates to an electrode plate of battery and the lithium battery with said electrode plate. Wherein, the four angles of said electrode plate all are smooth curve angles. With said inventive electrode plate, when coiling or layering the anode plate, baffle film and the cathode plate to form the electrode core, the short circuit or micro short circuit of battery caused by breaking the baffle film with four shape angles can be avoided, to improve the safety of battery.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a pole piece of the lithium ion battery and a lithium ion battery containing the pole piece. Background technique [0002] As a chemical power source, a lithium-ion battery refers to a secondary battery that uses two compounds that can reversibly intercalate and deintercalate lithium ions as the positive and negative electrodes. When the battery is charged, lithium ions are deintercalated from the positive electrode and intercalated in the negative electrode, and vice versa during discharge. Existing lithium-ion batteries are mainly divided into square lithium-ion batteries and cylindrical lithium-ion batteries according to their shapes. Prismatic lithium-ion batteries are mainly used in mobile phones and power equipment as their power source. Cylindrical lithium-ion batteries are one of the main power sources of notebook computers. [0003] The lithium-ion battery comprises a non-aque...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M4/02H01M10/40H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 毛德和许教练曹小飞苏少雄
Owner BYD CO LTD
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