Negative plate and lithium ion battery

A lithium-ion battery and negative electrode technology, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of poor cycle performance, safety problems, distortion and deformation of lithium-ion batteries, and achieve improved cycle stability and safety performance , good cycle performance and safety performance, and the effect of reducing the possibility of deformation

Active Publication Date: 2021-06-22
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] However, the lithium intercalation mechanism of silicon-based negative electrode materials is different from that of anisotropic graphite-based negative electrode materials. The alloying process is accompanied by very large isotropic expansion. In actual use, the expanded silicon-based negative electrode materials will produce large The in-plane expansion of the electrode sheet causes the internal stress of the negative electrode sheet to increase, causing distortion and even tearing of the copper foil substrate, resulting in poor cycle performance of the lithium-ion battery, and may even lead to battery cell failure and safety issues

Method used

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preparation example Construction

[0055] The preparation method of the silicon-based material of the present invention comprises the following steps:

[0056] 1) Carbon-coated Li-SiO x Materials and organic solvents containing oxygen-containing salts are mixed and dispersed to form a suspension solution;

[0057] 2) Drying the mixed solution in step 1) to obtain a silicon-based material.

[0058] Specifically, the carbon-coated Li-SiO in step 1) x The material may be purchased commercially, as long as the carbon material in the carbon coating satisfies the definition of the above-mentioned carbon material.

[0059] The organic solvent in step 1) can be N-methylpyrrolidone (NMP), ethanol, acetone, toluene.

[0060] Based on the total mass of the silicon-based material, the mass percentage of the oxygen-containing salt in step 1) is 0.05-5%.

[0061] The drying method in step 2) is not particularly limited, and any method that can make the mixed solution in step 1) dry falls within the protection scope of th...

Embodiment 1

[0091] The preparation method of the negative plate of the present embodiment comprises the following steps:

[0092] 1) The purchased carbon-coated Li-SiO 1.07 The material is placed in Al(PO 3 ) 3 After stirring in the nano-suspension for 60 minutes, the mixed system was dried, and then filtered to obtain a silicon-based material;

[0093] Among them, 2.6wt%Al(PO 3 ) 3 Nanosuspensions were obtained commercially.

[0094] Carbon-coated Li-SiO 1.07 The material and the silicon-based material are weighed, and the difference is calculated to obtain that the mass of the above-mentioned oxygen-containing salt coating layer accounts for 0.5% of the total mass of the silicon-based material. The particle size D of the above silicon-based material v10Si 5.8 μm, D v50Si 9 μm, D v90Si is 15 μm.

[0095] SEM was used to observe the surface morphology of silicon-based materials, figure 1 It is the surface SEM image of the silicon-based material in Example 1 of the present inven...

Embodiment 2

[0101] The preparation method of the negative plate of the present embodiment comprises the following steps:

[0102] 1) The purchased carbon-coated Li-SiO 1.04 The material is put into La(PO 3 ) 3 After stirring in the nano-suspension for 60 minutes, the mixed system was dried, and then filtered to obtain a silicon-based material;

[0103] Among them, 3.1wt%La(PO 3 ) 3 Nanosuspensions are commercially available.

[0104] Carbon-coated Li-SiO 1.04 The material and the silicon-based material are weighed, and the difference is calculated to obtain that the mass of the above-mentioned oxygen-containing salt coating layer accounts for 0.5% of the total mass of the silicon-based material. The particle size D of the above silicon-based material v10Si 4.2 μm, D v50Si 5.9 μm, D v90Si is 10.4 μm.

[0105] 2) The silicon-based material in step 1) is mixed with graphite particles at a mass ratio of 15:85, and the silicon-based material and graphite particles, styrene-butadiene ...

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Abstract

The invention provides a negative plate and a lithium ion battery. A negative active layer of the negative plate provided by the invention comprises a silicon-based material and graphite particles; the silicon-based material comprises a functional silicon-based material, at least three graphite particles are arranged around the functional silicon-based material, and the distance between the graphite particles and the functional silicon-based material is 0.5-2 microns. The negative plate provided by the invention has lower expansion performance and good cycle performance under the condition of high energy density, the lithium ion battery provided by the invention not only has high energy density, but also has good cycle performance and safety performance, and is suitable for large-scale commercial application, and when the lithium ion battery is used for electronic equipment, the performance of the lithium ion battery is greatly improved. The service life of the electronic equipment can be prolonged.

Description

technical field [0001] The invention relates to a negative electrode sheet and a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] With the rapid development of lithium-ion batteries, lithium-ion batteries made of traditional lithium cobalt oxide (LCO), lithium iron phosphate (LFP), nickel-cobalt-manganese (NCM), nickel-cobalt-aluminum (NCA) cathode materials and graphite anode materials The energy density of lithium-ion batteries is far from meeting the needs of the market, so it is necessary to develop new positive and negative electrode systems that can increase the energy density of lithium-ion batteries. [0003] Silicon-based anode materials have excellent properties such as high specific capacity, low cost, and easy processing, so they can replace graphite anodes to significantly increase the energy density of batteries, and are very promising next-generation anode materials. [0004] However, the lithium in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/386H01M4/587H01M4/366H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 薛佳宸刘春洋李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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