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Lithium ion battery and positive plate of lithium ion battery

A lithium-ion battery, cathode sheet technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of capacity attenuation, limitation, poor low-temperature performance of lithium-ion batteries, etc., to reduce the degree of oxidation, improve the Effects of high temperature storage performance and high temperature cycling performance

Active Publication Date: 2015-02-18
NINGDE AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Some technical solutions are reported in the existing patent literature to solve the problem of rapid capacity decay of the battery during high-temperature and high-rate cycles. For example, the Chinese patent application number CN201010181766.6 discloses a high-temperature electrolyte to improve the lithium-ion capacity. The high-temperature cycle performance of the battery. Although this high-temperature electrolyte can improve the high-temperature cycle performance of the lithium-ion battery to a certain extent, the low-temperature performance of the lithium-ion battery becomes worse, thus limiting its further use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of positive electrode sheet:

[0026] The positive electrode active material lithium cobaltate (LiCoO 2 ), the conductive agent conductive carbon (Super-P), the adhesive polyvinylidene fluoride (PVDF) and polystyrene (PS) were mixed in the solvent N-methylpyrrolidone (NMP ), stir evenly to obtain positive electrode slurry. The obtained positive electrode slurry is coated on an aluminum foil with a thickness of 9 μm, dried, and cold pressed to obtain a compacted density of 1.5 g / cm 3 The pole piece is then cut and welded to obtain the positive pole piece.

[0027] Preparation of negative electrode sheet:

[0028] Negative electrode active material natural graphite, conductive agent conductive carbon (Super-P), binder styrene-butadiene rubber (SBR) and thickener sodium carboxymethyl cellulose (CMC) according to the mass ratio of 94:2:2:2 mixed in solvent water and stirred uniformly to obtain negative electrode slurry. The obtained negative electrode slurr...

Embodiment 2

[0035] Different from Example 1 is the preparation of positive electrode sheet:

[0036] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.5 mn 0.3 co 0.2 o2 ) and lithium cobaltate (LiCoO 2 ) mixture (the mass ratio of the two is 1:1), the mixture of conductive carbon nanotubes and conductive carbon (the mass ratio of the two is 1:10), the adhesive polyvinylidene fluoride (PVDF) and acrylonitrile - The styrene copolymer (AS) is mixed in the solvent N-methylpyrrolidone (NMP) according to the mass ratio of 75:2:3:20, and stirred evenly to obtain the positive electrode slurry. The obtained cathode slurry is coated on an aluminum foil with a thickness of 9 μm, dried, and cold pressed to obtain a compacted density of 1.55 g / cm 3 The pole piece is then cut and welded to obtain the positive pole piece.

[0037] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0039] Different from Example 1 is the preparation of positive electrode sheet:

[0040] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.5 mn 0.3 co 0.2 o 2 ), conductive agent flake graphite, adhesive polyvinylidene fluoride (PVDF) and acrylonitrile-butadiene-styrene copolymer (ABS) are mixed in the solvent N-methyl according to the mass ratio of 80:2:3:15 Pyrrolidone (NMP), stirring evenly to obtain positive electrode slurry. The obtained positive electrode slurry is coated on an aluminum foil with a thickness of 9 μm, dried, and cold pressed to obtain a compacted density of 1.6 g / cm 3 The pole piece is then cut and welded to obtain the positive pole piece.

[0041] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a positive plate of a lithium ion battery. The lithium ion battery comprises a positive current collector and a positive membrane which is coated on the positive current collector, wherein the positive membrane comprises a positive active material, adhesive and a conductive additive and further comprises a thermoplastic resin; and the thermoplastic resin is 7 to 30 %of the total weight of the positive membrane. Compared with the prior art, the positive plate is a pole sheet with the feature of hot expansion and cold contraction, when the temperature is lower, the electronic conductive ability is not affected; when the environmental temperature is raised, or the internal temperature of a cell is raised caused by self-heating of the cell, the thermoplastic resin is expanded, the positive electronic resistance is increased, and the polarization is also increased, the corresponding oxidability is correspondingly reduced; when the environment temperature is reduced, the low-resistance state is recovered. Moreover, the invention further discloses a lithium ion battery comprising the positive plate.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery positive electrode sheet capable of improving the high-temperature storage performance and high-temperature cycle performance of the lithium-ion battery, and a lithium-ion battery containing the positive electrode sheet. Background technique [0002] With the continuous development of modern electronic information technology, lithium-ion batteries have become an indispensable chemical power source for modern electronic information products due to their advantages such as high energy density, high voltage platform, low self-discharge rate and long cycle life. [0003] At present, the application of lithium-ion batteries is transitioning from a single cell to multiple cells connected in series and parallel, and battery packs have gradually become the mainstream direction of application for most electronic products. One or multiple str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/13H01M4/62
CPCY02E60/122Y02E60/10
Inventor 李枝贤李明
Owner NINGDE AMPEREX TECH
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