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
CN107785562BActive Publication Date: 2021-01-01BYD CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BYD CO LTD
Publication Date
2021-01-01

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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.
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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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