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Cylinder type lithium ion battery with high power rate and high safety performance

A lithium-ion battery, safety performance technology, applied in the direction of battery electrodes, secondary batteries, active material electrodes, etc., can solve few problems such as battery design structure optimization and improvement, achieve significant practical value and economic benefits, simple structure, Effects of improving magnification performance and safety performance

Inactive Publication Date: 2008-07-23
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, people are researching more on the improvement of the electronic conductivity of raw materials, especially for the olivine structure LiFePO with lower electronic conductivity. 4 materials, through various cladding and doping techniques to improve their conductivity, but few are optimized and improved from the aspect of battery design and structure

Method used

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  • Cylinder type lithium ion battery with high power rate and high safety performance
  • Cylinder type lithium ion battery with high power rate and high safety performance
  • Cylinder type lithium ion battery with high power rate and high safety performance

Examples

Experimental program
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Effect test

Embodiment 1

[0026] With spinel (LiMn 2 o 4 ) as the positive electrode active material, acetylene black as the conductive agent, and polyvinylidene fluoride (PVDF) as the binder. Mix the three evenly according to the ratio of 94:3:3, add 100 parts of N-methylpyrrolidone (NMP) and mix thoroughly to form a paste, evenly spread on 20μm thick aluminum foil and dry, and finally roll to 136μm, cut Form into a strip shape of 56×782 mm to obtain a positive electrode sheet. Based on the current collector, weld a positive tab to the middle of the pole piece, and paste the protective tape.

[0027] Mix the negative active material graphite powder, the conductive agent acetylene black and the binder polyvinylidene fluoride in a ratio of 90:4:6, add 100 parts of N-methylpyrrolidone (NMP) and mix thoroughly to form a paste, and apply it evenly on 15 μm Thick copper foil and dried, and finally rolled into 81μm, cut into 58 × 822mm long strips, to obtain the negative electrode sheet, based on the curr...

Embodiment 2

[0031] LiFePO with olivine structure 4 As the positive electrode active material, acetylene black is used as a conductive agent, and polyvinylidene fluoride (PVDF) is used as a binder. Mix the three evenly according to the ratio of 92:4:4, add 100 parts of N-methylpyrrolidone (NMP) and mix thoroughly to form a paste, evenly spread on 20μm thick aluminum foil and dry, finally roll into 138μm, cut Form into a strip shape of 56×750 mm to obtain a positive electrode sheet, weld a positive tab to the middle of the electrode sheet and paste a protective tape.

[0032] Mix the negative active material graphite powder, the conductive agent acetylene black and the binder vinylidene fluoride in a ratio of 90:4:6, add 100 parts of N-methylpyrrolidone (NMP) and mix thoroughly to form a paste, and apply it evenly on a surface of 15 μm thick Copper foil and dried, finally rolled into 91μm, cut into 58×810mm long strips to get the negative electrode sheet, welded the two negative tabs to 1 / ...

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Abstract

The invention relates to a circular lithium ion battery with high multiplying power and high safety, which is characterized in adopting LiMn2O4 or LiFePO4 as active materials of positive plate, adopting aqueous polyethylene oxide and oily polyvinylidene fluoride as agglomerant of the positive plate, wherein current collector of the positive plate is aluminum foil whose the thickness is 10-30 mum, adopting aluminum ear whose the thickness is 0.07-0.2mm as a positive ear, adopting the positive ear as the positive plate which is located in center corresponding the current collector, adopting graphitic carbon material as active material of a cathode plate, adopting aqueousbutadiene styrene rubber and oily polyvinylidene fluoride as the agglomerant, current collector of the cathode is clutch gold whose the thickness is 10-30 mum, adopting copper or nickel cathode ear whose the thickness is 0.07-0.20mm as cathode ear, two electrode ears of the cathode are respectively positioned on quarter and three quarter position of the cathode plate. Compared with the traditional positive and cathode plate which adopts structure design of monopole ear, the invention is capable of dramatically reducing internal resistance, improving multiplying power property and safety property of the battery, and having simple structure, rational design and reliable performance.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a cylindrical lithium ion battery with high rate and high safety performance. Background technique [0002] Because lithium-ion batteries have the advantages of high average output voltage, large specific energy, stable discharge voltage, and long working life, lithium-ion batteries have been widely used in the fields of mobile phones, notebook computers, and cameras. The further development of lithium-ion batteries is the development of power applications, which require good performance of high-current charging and discharging and higher power. As we all know, batteries suitable for high-current discharge require batteries to have low internal resistance. This is because on the one hand, the large internal resistance causes the internal temperature of the battery to rise sharply, which brings safety hazards and accelerates battery performance decline. In addition, due to the ohmic voltag...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/58H01M4/48H01M4/62H01M4/64H01M4/02H01M2/14H01M10/0525H01M50/534
CPCY02E60/10
Inventor 金慧芬高俊奎滕彦梅张绍丽
Owner TIANJIN LISHEN BATTERY
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