Lithium ion battery and its preparing method

A lithium-ion battery and battery technology, applied in the field of lithium-ion batteries and its preparation, can solve the problems of poor battery safety, poor high-temperature stability, etc., and achieve the goals of avoiding combustion or explosion, good high-temperature stability and safety performance, and suppressing temperature Elevated effect

Active Publication Date: 2009-06-24
江苏永茂普隆汽车配件制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor high-temperature stability of existing lithium-ion secondary batteries that lead to poor battery safety, and provide a lithium-ion battery with good high-temperature stability and good battery safety and a preparation method thereof

Method used

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Examples

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preparation example Construction

[0016] The preparation method of the lithium-ion battery provided by the present invention comprises preparing the positive pole and the negative pole of the battery, and preparing the positive pole, the negative pole and the diaphragm into an electrode group, and sealing the obtained electrode group and electrolyte in the battery case, wherein the diaphragm The ceramic diaphragm provided by the present invention.

[0017] The electrode group is obtained by winding and separating the prepared positive electrode and negative electrode through a separator layer, and the stacking and winding methods of the separator layer between the positive electrode and the negative electrode are known to those skilled in the art, for example, the The separator and electrode sheet provided by the present invention are stacked in the order of separator, negative electrode sheet or positive electrode sheet, separator, positive electrode sheet or negative electrode sheet to form a laminated electr...

Embodiment 1

[0038] This example illustrates the preparation of lithium ion batteries provided by the present invention.

[0039] (1) Preparation of positive electrode

[0040] 100 parts by weight of the positive active ingredient LiCoO 2 , 5 parts by weight of the binder polyvinylidene fluoride (PVDF), 4 parts by weight of the conductive agent acetylene black were added to 60 parts by weight of nitrogen methyl pyrrolidone (NMP), and then stirred in a vacuum mixer to form a uniform positive electrode slurry.

[0041] The slurry is evenly coated on an aluminum foil with a thickness of 20 microns, then dried at 120°C, rolled and then cut on a slitting machine to obtain a positive electrode with a size of 52 mm × 32 mm × 130 microns, which contains 0.65 grams of positive electrode material.

[0042] (2) Preparation of negative electrode

[0043] 100 parts by weight of negative electrode active material natural graphite, 5 parts by weight of binder polytetrafluoroethylene (PTFE) are added t...

Embodiment 2

[0050] This example illustrates the preparation of lithium ion batteries provided by the present invention.

[0051] (1) Preparation of positive electrode

[0052] 100 parts by weight of the positive active ingredient LiCoO 2 , 5 parts by weight of the binder polyvinylidene fluoride (PVDF), 4 parts by weight of the conductive agent acetylene black were added to 60 parts by weight of nitrogen methyl pyrrolidone (NMP), and then stirred in a vacuum mixer to form a uniform positive electrode slurry.

[0053] The slurry was evenly coated on an aluminum foil with a thickness of 20 microns, then dried at 120°C, rolled and cut on a slitting machine to obtain a positive electrode with a size of 52 mm × 360 mm × 130 microns, which contained 6.5 grams of positive electrode material.

[0054] (2) Preparation of negative electrode

[0055] 100 parts by weight of negative electrode active material natural graphite, 5 parts by weight of binder polytetrafluoroethylene (PTFE) are added to 1...

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Abstract

A lithium ion battery, the battery includes an electrode group and a non-aqueous electrolyte, the electrode group and the non-aqueous electrolyte are sealed in a battery case, the electrode group includes a positive electrode, a negative electrode and a diaphragm, wherein the diaphragm is a ceramic diaphragm. The lithium ion battery provided by the invention has good high temperature stability and safety performance.

Description

technical field [0001] The present invention relates to a battery and its preparation method, specifically, the present invention relates to a lithium ion battery and its preparation method. 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. [0003] Lithium-ion secondary batteries are widely used in modern mobile electronic devices and communication devices, such as mobile phones, notebook computers, and handheld computers, because of their advantages such as high specific energy, high working voltage, low self-discharge rate, long cycle life, and no pollution , Personal Digital Assistant (PDA), compact camera, digital camera,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M2/16H01M2/18H01M10/38H01M10/0525H01M10/058H01M50/434
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 刘卫平梁世硕朱小明
Owner 江苏永茂普隆汽车配件制造有限公司
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