Anode material, preparation method thereof, negative plate, and lithium ion battery

A technology of negative electrode material and negative electrode plate, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low energy density of batteries, low tap density of materials, not suitable for practical applications, etc., and achieve comprehensive electrochemical performance improvement. , high electrical conductivity, the effect of improving the rate performance

Inactive Publication Date: 2018-06-26
HUAWEI TECH CO LTD
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Problems solved by technology

[0005] However, the particle size of this nanocomposite material is only a few hundred nanometers, and a large number of cavity structures will result in a low tap density of the material, which will lead to a low energy density of the battery after being assembled into a pole piece, which is not suitable for practical application

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  • Anode material, preparation method thereof, negative plate, and lithium ion battery

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preparation example Construction

[0061] The negative electrode material is introduced above, and the preparation method of the negative electrode material is described in detail below, and the specific steps are as follows:

[0062] According to the technical problems solved by the embodiments of the present invention, the index of the negative electrode material can be divided into two parts, the first part is the process of preparing the first particle, and the second part is the process of preparing the second particle by cross-linking the polymer. It should be understood that the second part in the embodiment of the present invention can be implemented alone, that is, directly close-packing the existing nano-scale particles with the properties of the first particle; it can also be implemented in combination with the first part, that is, first preparing the first particle, and then The first particles are subjected to close packing. This embodiment of the present invention does not limit it. The preparati...

Embodiment 1

[0077] Example 1. Silicon@zinc oxide (Si@ZnO) hollow shell core nanoparticles are used as the first particle, diethylene glycol diacrylate phthalate is used as the cross-linked polymer, and carbon nanotubes are used as the conductive additive. The negative electrode material, the specific steps are as follows:

[0078] 201. Prepare a third particle, wherein the third particle is a silicon@amorphous carbon (Si@C) core-shell nanoparticle.

[0079] Specifically, using silicon particles with a particle size of less than 100 nanometers (nm) as the silicon core, 4 g of glucose and 100 mg of cetrimonium bromide were dissolved in 40 mL of deionized water to form a clear solution; then 1 g of the silicon core material was ultrasonically dispersed in the solution and then transferred together to a 50mL hydrothermal reactor at 180°C for 8 hours (h); the solution was cooled to room temperature to form an amorphous carbon-coated black solid product, which was collected by centrifugation an...

Embodiment 2

[0087] Embodiment 2, using silicon@titanium dioxide (Si@TiO 2 ) Hollow-shell core nanoparticles are the first particle, the mixed toluene solution of sodium carboxymethyl cellulose is the cross-linked polymer, and the graphene nanosheet dispersion is the negative electrode material formed by the conductive additive, and the specific steps are as follows:

[0088] 301. Prepare a third particle, wherein the third particle is a silicon@amorphous carbon (Si@C) core-shell nanoparticle.

[0089] Specifically, using silicon particles with a particle size of less than 100 nanometers (nm) as the silicon core, 4 g of glucose and 100 mg of cetrimonium bromide were dissolved in 40 mL of deionized water to form a clear solution, and then 1 g of nano-silicon powder was uniformly dispersed in the solution, and transferred together to a 50mL hydrothermal reactor for 8 hours at 180°C; after the solution was cooled to room temperature, the coated black solid product was collected by centrifugat...

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Abstract

The invention embodiment provides an anode material, a preparation method thereof, a negative plate, and a lithium ion battery. The anode material comprises a plurality of first particles and a crosslinking polymer; close packing of the first particles is realized through the crosslinking polymer so as to form a second particle; the first particles comprise a silicon core and a housing material coating layer; and a cavity is formed between the inner silicon core and the housing material coating layer. According to the anode material, the micron grade large particle is formed via close packingof the plurality of nanometer grade small particles through the crosslinking polymer, so that when the anode material is taken as a battery negative electrode, battery energy intensity is increased effectively.

Description

technical field [0001] Embodiments of the present invention relate to the field of lithium-ion batteries, and more specifically, relate to a negative electrode material, a preparation method thereof, a negative electrode sheet, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect, small self-discharge rate, and environmental protection. They are currently commercially used as a secondary battery and are ideal for various portable electronic devices and electric vehicles. Energy storage accessories. The traditional lithium-ion battery graphite anode has good cycle stability and cost performance, but the current development of commercial conventional graphite anode materials is close to its theoretical limit capacity (375mAh / g). In order to further increase the energy density of batteries, it is extremely urgent to develop new anode materials with high specific capacity, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/366H01M4/386H01M4/622H01M10/0525H01M2004/021Y02E60/10
Inventor 杨婉璐李阳兴刘辰光
Owner HUAWEI TECH CO LTD
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