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Negative electrode slurry, negative electrode plate and lithium ion battery

A lithium-ion battery and negative electrode slurry technology, which is applied in secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve problems such as shortening service life and reducing cycle performance.

Inactive Publication Date: 2021-06-22
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Part of the reason for setting the power reduction mechanism is that during the high-temperature cycle, the negative electrode of the lithium-ion battery is prone to side reactions, resulting in reduced cycle performance and shortened service life.

Method used

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  • Negative electrode slurry, negative electrode plate and lithium ion battery
  • Negative electrode slurry, negative electrode plate and lithium ion battery
  • Negative electrode slurry, negative electrode plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a negative electrode slurry, which includes graphite and SiO used as negative active materials. m (07 :

[0049]

[0050] Among them, in the negative electrode active material, the content of graphite is 85%, SiO m The content is 15%;

[0051] In the negative electrode slurry, the mass ratio of negative electrode active material: conductive agent: sodium carboxymethyl cellulose: styrene-butadiene rubber: polyorganosiloxane is 90:4:2:4:0.475. That is, the amount of polyorganosiloxane added is 0.5% of the mass of the negative electrode active material.

[0052] This embodiment also provides a lithium ion secondary battery, the preparation method of the lithium ion secondary battery is as follows:

[0053] 1. Preparation of Negative Electrode

[0054] According to the above proportions, various raw materials were uniformly mixed in a vacuum mixer to obtain negative electrode slurry with a solid content of 50 wt %; the negative electrode slur...

Embodiment 2

[0062] This embodiment provides a negative electrode slurry, the difference from Embodiment 1 is that polyorganosiloxane is replaced by polypropylene oxide.

Embodiment 3

[0064] This embodiment provides a negative electrode slurry, which differs from the embodiment 1 in that polyorganosiloxane is replaced by polyethylene oxide, and the amount of polyethylene oxide added is 0.01% of the mass of the negative electrode active material.

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Abstract

The invention discloses negative electrode slurry, a negative electrode plate and a lithium ion battery. In the first aspect of the invention, the negative electrode slurry is provided and comprises a negative electrode active material and a polymer ion conductor, and the polymer ion conductor is a homopolymer formed by an oxygen-containing monomer. According to the embodiment of the invention, the negative electrode slurry at least has the following beneficial effects: after the polymer ion conductor with specific composition is added into the negative electrode slurry, the viscosity is improved, so that the phenomena of wrinkling, cracking and the like in the coating and baking process of a pole piece can be inhibited, and the wettability of an electrode to electrolyte is promoted so as to improve the rate capability of a battery; and the high-temperature cycle performance of the battery can be remarkably improved to a great extent, so that the service life of the lithium ion battery is ensured.

Description

technical field [0001] The present application relates to the technical field of lithium ion batteries, in particular to negative electrode slurry, negative electrode sheets and lithium ion batteries. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the reversible intercalation and deintercalation of lithium ions between the positive and negative electrodes. Compared with other types of batteries, lithium-ion batteries have high power characteristics and long service life, which also make them widely used in various electronic products. As the market demand for high-energy-density lithium-ion batteries continues to increase, the charging experience has become a core pain point for consumers. Shortening the charging time can better improve the user experience of electronic products, which is very important for enhancing the competitiveness of electronic products. significance. To this end, major manufacturers have successively l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/058H01M10/0525H01M10/42
CPCH01M4/13H01M4/624H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 梁世硕高一琳闫龙
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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