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Lithium ion battery

A technology for lithium-ion batteries and electrode groups, which is applied in battery electrodes, secondary batteries, circuits, etc., and can solve the problems of unsatisfactory anti-over-discharge solutions for lithium-ion batteries

Active Publication Date: 2014-04-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem that the existing lithium-ion battery anti-over-discharge scheme is not ideal enough, the present invention provides a lithium-ion battery with excellent anti-over-discharge performance and good high-temperature performance

Method used

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Examples

Experimental program
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Effect test

Embodiment approach

[0030] Among them, the separator can be selected from various separators used in lithium-ion batteries known to those skilled in the art, such as polyolefin microporous membrane (PP), polyethylene felt (PE), glass fiber felt or ultrafine glass fiber paper or PP / PE / PP. As a preferred embodiment, the separator is PP / PE / PP.

[0031] The casing is not limited in the present invention, and various battery casings known to those skilled in the art can be used, such as hard casings such as steel casings or aluminum casings, or soft packaging casings such as aluminum-plastic films, and the shape and size can be designed according to actual conditions .

[0032] The preparation method of the lithium-ion battery provided by the present invention can be a method known to those skilled in the art. Generally speaking, the method includes winding the positive pole, the negative pole and the separator between the positive pole and the negative pole in sequence to form a pole core, and The...

Embodiment 1

[0036] (1) Preparation of positive electrode:

[0037] 80g of lithium iron phosphate with a maximum particle size of 4 microns (D 50 = 0.5 µm), 10 g Li 1.01 Ni 0.89 mn 0.1 o 2 , 10g of iron phosphate with a minimum particle size of 30 microns (D 50 =40 microns), 4g of binder polyvinylidene fluoride (PVDF), 5g of conductive agent SP (super conductive carbon black), 0.5g of dispersant polyvinylpyrrolidone (PVP) and 120g of N-methylpyrrolidone were added Stir in a vacuum mixer to form a uniform positive electrode slurry. The positive electrode slurry was evenly coated on both sides of an aluminum foil with a thickness of 16 μm, and then dried at 150° C. After rolling and cutting, a positive electrode sheet with a size of 453*40 mm is obtained.

[0038] (2) Preparation of negative electrode:

[0039] Add 45g of natural graphite, 5g of LTO (lithium titanate), 1g of binder styrene-butadiene rubber latex (SBR), 0.5g of binder carboxymethylcellulose (CMC), and 125g of deionize...

Embodiment 2

[0043] Adopt the same method and steps as in Example 1 to prepare the positive electrode, negative electrode and battery, the difference is the configuration of the positive electrode slurry: 84g lithium iron phosphate, 5g Li 1.076 Ni 0.628 mn 0.624 o 2 , 3 g Li 2 mn 2 o 4 , 10g of iron phosphate with a minimum particle size of 30 microns, 4g of polyvinylidene fluoride (PVDF), 5g of conductive agent SP, 0.5g of dispersant polyvinylpyrrolidone (PVP) and 120g of N-methylpyrrolidone were added to the vacuum mixer Stir to form a homogeneous cathode slurry.

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Abstract

The invention provides a lithium ion battery. The lithium ion battery comprises a shell, and an electrode group and an electrolyte which are sealed in the shell, and the electrode group comprises a positive electrode, a negative electrode and a diaphragm positioned between the positive electrode and the negative electrode, wherein the positive electrode comprises a positive conductive matrix and a positive material adhered to the positive conductive matrix, and the positive material comprises a lithium iron phosphate positive active material, a lithium-containing additive, iron phosphate, a conductive agent and a positive binder; the lithium-containing additive is selected from one or more of Lix1Niy1Mnz1O2, Lix2M1y2Oz2, a silicate series positive active material and Lix3M2(WOz3), and the primary particle diameter of iron phosphate is not lower than 20mum; and the negative electrode comprises a negative conductive matrix and a negative material adhered to the negative conductive matrix, the negative material comprises a negative active material and a negative binder, and the negative active material comprises graphite and lithium titanate. The over-discharge resistance capability of the lithium ion battery made in the invention is excellent.

Description

technical field [0001] The invention relates to a lithium ion battery. Background technique [0002] Compared with other chemical power sources, lithium-ion batteries have many excellent properties, such as high energy density, long cycle life, high open circuit voltage, no memory effect, safety and pollution-free, etc. After nearly two decades of rapid development, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras and other fields. With the rise of global oil prices and the enhancement of people's awareness of environmental protection, both research institutions and enterprises are paying attention to the development of electric vehicles. Researchers generally believe that lithium-ion batteries are one of the most promising chemical power sources for electric vehicles. Compared with other mobile devices, electric vehicles have higher requirements on the performance of batteries such as cycle life, energy density, consistency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/485H01M10/0525
CPCY02E60/122H01M4/364H01M4/485H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 田野周耀华
Owner BYD CO LTD
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