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Lithium-ion power battery with good safety performance

A power battery and safety performance technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of short cycle life, insufficient, poor safety performance, etc., to improve cycle life, slow down negative electrode expansion, and high safety Effect

Active Publication Date: 2016-02-10
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion power battery with good safety performance in order to overcome the problems of short cycle life, poor safety performance and insufficient solutions to these problems in the current lithium-ion power battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare the positive electrode sheet: mix 90 parts by weight of nickel cobalt lithium manganese oxide, 2 parts by weight of conductive carbon black SP, 0.7 parts by weight of carbon nanotube CNT, and 5 parts by weight of polyvinylidene fluoride, and add 100 parts by weight of N-N-dimethylpyrrolidone is stirred to form a slurry, which is evenly coated on the positive electrode-based fluid calendered aluminum foil with a thickness of 8 μm, and after drying, it is rolled by a roller compactor to make a positive electrode sheet.

[0028] Preparation of negative pole piece: Mix 90 parts by weight of lithium titanate, 1 part by weight of conductive carbon black SP, and 8 parts by weight of polyvinylidene fluoride, and add 110 parts by weight of N-N-dimethylpyrrolidone to form a slurry, uniform Coated on a 10 μm thick negative electrode-based fluid electrolytic copper foil, dried and rolled with a rolling machine to make a negative electrode sheet.

[0029] Negative electrode ...

Embodiment 2

[0036] Preparation of positive electrode sheet: mix 90 parts by weight of lithium cobaltate, nickel cobalt lithium manganate mixture (3:7), 2 parts by weight of conductive carbon black SP, 3 parts by weight of carbon nanotube CNT, and 6 parts by weight of poly Vinylidene fluoride, and add 100 parts by weight of N-N-dimethylpyrrolidone to stir to form a slurry, uniformly coated on the positive electrode-based fluid calendered aluminum foil with a thickness of 10 μm, and after drying, roll it with a roller compactor to make a positive electrode pole piece.

[0037] Preparation of negative pole piece: Mix 90 parts by weight of lithium titanate, 2.7 parts by weight of conductive carbon black SP, and 8 parts by weight of polyvinylidene fluoride, and add 110 parts by weight of N-N-dimethylpyrrolidone to form a slurry, uniform coated on a 6 μm thick negative electrode-based fluid electrolytic copper foil, and rolled with a rolling machine after drying to make a negative electrode she...

Embodiment 3

[0045] Prepare the positive electrode sheet: mix 90 parts by weight of lithium cobaltate, 2 parts by weight of conductive carbon black SP, 3 parts by weight of vapor-grown carbon fiber, and 6 parts by weight of polyvinylidene fluoride, and add 120 parts by weight of N-N-two The methylpyrrolidone was stirred to form a slurry, which was evenly coated on the calendered aluminum foil of the positive electrode base fluid with a thickness of 6 μm. After drying, it was rolled by a roller compactor to make the positive electrode sheet.

[0046] Preparation of negative pole piece: mix 90 parts by weight of lithium titanate, 2 parts by weight of conductive carbon black SP, 4 parts by weight of scaly graphite, and 8 parts by weight of polyvinylidene fluoride, and add 110 parts by weight of N-N-two The methyl pyrrolidone is stirred to form a slurry, which is evenly coated on the 6 μm thick negative electrode base fluid electrolytic copper foil, and after drying, it is rolled by a roller co...

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Abstract

The invention relates to the technical field of lithium-ion power batteries, in particular to a lithium-ion power battery with good safety performance. Including positive electrode, diaphragm, negative electrode and electrolyte, negative electrode includes negative electrode current collector and negative electrode active material layer, negative electrode active material layer includes negative electrode active material and conductive material, negative electrode active material is lithium titanate, the ratio of negative electrode capacity to positive electrode capacity is 0.65 -0.68. The lithium-ion power battery effectively improves the cycle life of the battery, the safety performance of the battery, and the high-current charging and discharging performance of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power batteries, in particular to a lithium-ion power battery with good safety performance. Background technique [0002] Lithium-ion power battery is a new type of high-energy battery successfully developed in the 20th century. Lithium-ion power batteries have the advantages of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. The structure of a general lithium-ion power battery is: in the form of laminations, a battery cell is formed by interleaving the positive electrode, separator, and negative electrode (or the battery is made in the form of winding), and then connected to the external terminal and placed in a hard case (such as Plastic shell, steel shell, aluminum shell) or aluminum plastic film, inject electrolyte. However, the current lithium-ion power batteries have problems such as short cycle li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/485H01M4/66
CPCH01M4/485H01M4/661H01M10/0525Y02E60/10
Inventor 马伟华潘美姿马兴立颜雪冬
Owner 东莞维科电池有限公司
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