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A kind of negative pole active material and preparation method thereof, negative pole material, negative pole and lithium ion battery

A negative electrode active material, negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unsatisfactory results

Active Publication Date: 2021-01-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, attempts have been made to improve the lithium-conducting performance of the SEI film while maintaining the stability of the SEI film by adding other film-forming additives to the electrolyte in conjunction with vinylene carbonate, thereby reducing the overall impedance of the battery and improving the battery life. High temperature performance and low temperature performance, but the results are not ideal

Method used

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  • A kind of negative pole active material and preparation method thereof, negative pole material, negative pole and lithium ion battery
  • A kind of negative pole active material and preparation method thereof, negative pole material, negative pole and lithium ion battery
  • A kind of negative pole active material and preparation method thereof, negative pole material, negative pole and lithium ion battery

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preparation example Construction

[0032] The present invention also proposes a preparation method of negative electrode active material, comprising:

[0033] (1) adding graphite and isopropyl (dodecylbenzenesulfonyl) titanate into the first organic solvent according to the ratio, stirring under sealed conditions and drying to obtain a solid;

[0034] (2) Mix the solid in step (1) with the second organic solvent and water according to the proportion, stir and dry to obtain the negative electrode active material.

[0035] In the present invention, the isopropyl (dodecylbenzenesulfonyl) titanate has a structural formula shown in formula (3):

[0036]

[0037] Formula (3).

[0038] In step (1), graphite and isopropyl (dodecylbenzenesulfonyl) titanate are added in the first organic solvent according to the proportion and the purpose of stirring under sealed conditions is to prevent the isopropyl (dodecylbenzenesulfonyl) titanate from Sulfonyl) titanate is lost due to hydrolysis before adsorption is formed on t...

Embodiment 1

[0057] (1) Prepare the precursor of isopropyl (dodecylbenzenesulfonyl) titanate adsorbed on the surface of graphite particles

[0058] Take 10g of graphite (the particle size of graphite particles meets D50=10um) and add it to 30ml of ethanol solution (after dehydration treatment, water content is 2.8%) and stir for one minute, slowly add 0.2g of triisopropyl (dodecyl Benzenesulfonyl) titanate, stirred for 1 h under sealed conditions, filtered, and the graphite on the filter paper was cleaned with absolute ethanol, and then dried in a decompression oven at low pressure (10kpa);

[0059] (2) Preparation of negative electrode active material

[0060] The above precursor was added to a mixed solution of 20ml ethanol and 10ml water, stirred at 50°C for 1h, filtered and washed, then dried at 110°C to obtain the negative electrode active material A1 described in this application.

[0061] (3) Preparation of lithium ion battery

[0062] The negative electrode active material A1, ac...

Embodiment 2

[0064] The same steps and methods as in Example 1 are used to prepare the battery, the difference is that 10 g of graphite is added in step (1), the particle size of the graphite particles satisfies D50=12um, and isopropyl (dodecylbenzenesulfonyl) titanium is added Ester 0.8g; Negative electrode active material A2 and lithium ion battery S2 were prepared.

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Abstract

The invention provides a negative electrode active material, a preparation method of the negative electrode active material, a negative electrode material, a negative electrode and a lithium ion battery. The negative electrode active material comprises graphite particles and covering layers positioned on the surfaces of the graphite particles, wherein the covering layers comprise organic titaniumpolymers; the organic titanium polymers have a structure shown as a formula (I) in the description, wherein R is an alkyl group with the carbon atom number being 12; n is greater than or equal to 10 but smaller than or equal to 40. When the negative electrode active material is applied to the negative electrode, the stability and the lithium guide performance of an SEI film can be effectively improved, so that the prepared battery has reduced impedance and good high-temperature performance and low-temperature performance.

Description

technical field [0001] The invention relates to a negative electrode active material, a preparation method thereof, a negative electrode material, a negative electrode and a lithium ion battery. Background technique [0002] The SEI film formed on the electrode surface of a lithium-ion battery is an important part to prevent short circuits inside the battery. It is mainly produced by the decomposition of the electrolyte during the charging and discharging process of the battery, and its main components are inorganic salts, organic salts, etc. The stability and lithium-conducting performance of the SEI film directly affect the high-temperature performance and low-temperature performance of the battery; in the prior art, the improvement of the lithium-conducting performance and stability of the SEI film is mainly by adding various film-forming additives to the electrolyte. That is, by changing the composition of the electrolyte to change the structure and composition of the SE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/46H01M4/583H01M4/60H01M4/133H01M4/137H01M10/0525
CPCH01M4/133H01M4/137H01M4/366H01M4/583H01M4/602H01M10/0525Y02E60/10
Inventor 付敏
Owner BYD CO LTD
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