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A separating membrane used for a lithium ion battery, a preparing method thereof and the lithium ion battery

A lithium ion battery and separator technology, applied in the field of lithium ion battery separator and its preparation, can solve the problems of uneven material dispersion, easy defects of pole pieces, long mixing time and the like

Inactive Publication Date: 2017-04-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a separator for lithium ion batteries and a preparation method thereof and a lithium ion battery comprising the separator for lithium ion batteries, so as to improve the instantaneous rate charging performance, low temperature charging performance and normal temperature cycle of lithium ion batteries performance without affecting its energy density, and there will be no problems such as the difficulty of binder matching and conductive agent matching in the preparation of negative electrode mixing process, long mixing time and uneven dispersion of materials, and easy defects of pole pieces.

Method used

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  • A separating membrane used for a lithium ion battery, a preparing method thereof and the lithium ion battery
  • A separating membrane used for a lithium ion battery, a preparing method thereof and the lithium ion battery

Examples

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Embodiment approach

[0020] According to the lithium-ion battery separator of the present invention, as long as the side coated with the lithium titanate layer is attached to the negative electrode of the lithium-ion battery, the object of the present invention can be achieved, and the thickness of the lithium titanate layer can be relatively high. Choose from a wide range. According to a preferred embodiment of the present invention, the thickness of the lithium titanate layer is 2-5 μm.

[0021] In addition, according to the separator for a lithium ion battery of the present invention, the average particle size of the lithium titanate particles in the lithium titanate layer may be 100-500 nm, preferably 200-400 nm.

[0022] The present invention has no particular limitation on the coating on the other side of the lithium ion battery separator, which can be various coatings conventionally used, as long as the positive and negative electrodes of the lithium ion battery can be effectively insulated, the...

Embodiment 1-5

[0076] Used to illustrate the separator for lithium ion battery provided by the present invention and its preparation and lithium ion battery

[0077] 1. Diaphragm for lithium ion battery and its preparation

[0078] (1) Preparation of slurry containing lithium titanate

[0079] According to the weight percentage in Table 1, mix the binder, solvent and optional auxiliary materials, stir at 1000 rpm for 60 minutes to make the dispersion uniform, and then add lithium titanate particles with a particle size of 200-400 nm according to the weight in Table 1. Stir at 1200rpm for 120min at no more than 70℃ to make the mixture uniformly dispersed. Then the uniformly dispersed mixture material is vacuum degassed, thereby obtaining slurries ST1-ST5 containing lithium titanate.

[0080] (2) Preparation of slurry containing ceramic materials

[0081] According to the weight percentage in Table 1, mix the binder, solvent and auxiliary materials, stir at 1000 rpm for 60 minutes to make the dispersi...

Embodiment 6

[0099] Used to illustrate the separator for lithium ion battery provided by the present invention and its preparation and lithium ion battery

[0100] The lithium ion battery separator and lithium ion battery were prepared according to the method of Example 4. The difference is that during the preparation of the lithium titanate slurry, the CMC, solvent and auxiliary materials were mixed together, and LA133 was added after uniform dispersion. Then add 15 parts by weight of lithium titanate particles with a particle size, stir at 1000 rpm for 60 minutes to make the dispersion uniform, then add SBR, and stir at 1200 rpm for 120 minutes at no more than 70°C to make the mixture uniformly dispersed. Then the uniformly dispersed mixture material is vacuum degassed, thereby obtaining a slurry ST6 containing lithium titanate.

[0101] The instantaneous rate charging performance of the obtained lithium ion battery D6 is shown in Table 2, the low temperature charging performance is shown in ...

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Abstract

The invention relates to the field of lithium ion batteries, and discloses a separating membrane used for a lithium ion battery. The separating membrane includes a polymer substrate and a lithium titanate layer formed on one side of the polymer substrate. A preparing method of the separating membrane used for the lithium ion battery and the lithium ion battery comprising the separating membrane are also disclosed. Compared with a mixed anode, through adopting the lithium titanate layer of the separating membrane as an anode separating membrane of the lithium ion battery, a problem that heterogeneous compatibility of lithium titanate and graphite is difficult in a mixing process is overcome, anode material mixing processes are simplified and electrode sheet homogeneity is not influenced. The polymer substrate is coated with the lithium titanate, and the side coated with the lithium titanate layer is adhered to a graphite cathode, thus achieving functions of mixed anodes and further improving transient rate charging performance, low-temperature charging performance and room-temperature cyclic performance.

Description

Technical field [0001] The present invention relates to the field of lithium ion batteries, in particular to a lithium ion battery separator and a preparation method thereof, and a lithium ion battery including the lithium ion battery separator. Background technique [0002] Lithium-ion batteries have the characteristics of high discharge voltage, high energy density, and long cycle life. Therefore, they are widely used in the field of portable electronic devices and are favored by high-tech applications such as military, aerospace, and electric vehicles. [0003] A traditional lithium battery consists of a positive electrode, a negative electrode, a separator and an electrolyte. At present, the mainstream anode material for lithium-ion batteries is graphite material, which has the characteristics of high energy density, but the material has poor cycle performance, low temperature charging performance and rate charging performance. Lithium titanate is a structural zero-strain mate...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/449H01M50/451
CPCH01M10/0525H01M50/431H01M50/403Y02E60/10
Inventor 杜木挺王晕
Owner BYD CO LTD
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