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High-capacity fast-charging negative electrode composite material and preparation method thereof

A composite material, high-capacity technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as the inability to balance energy density and fast charging performance, and achieve the effect of improving cycle performance, strong conductivity, and high capacity

Pending Publication Date: 2022-08-09
格龙新材料科技(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-capacity fast-charge negative electrode composite material and its preparation method in order to overcome the problem that the energy density and fast-charge performance of the prior art cannot be balanced

Method used

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  • High-capacity fast-charging negative electrode composite material and preparation method thereof
  • High-capacity fast-charging negative electrode composite material and preparation method thereof
  • High-capacity fast-charging negative electrode composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Preparation of precursor composite material B:

[0024] 3g NiO, 300ml of 1wt% graphene oxide N-methylpyrrolidone solution, and 3g aluminum-titanium composite coupling agent were added to 100ml of N-methylpyrrolidone, and mixed uniformly by a high-energy ball mill to prepare coating liquid slurry A, Then, 100 g of artificial graphite was added into it, and after uniform dispersion, spray-dried to obtain a precursor composite material B of transition metal oxide-coated artificial graphite;

[0025] 2) Preparation of artificial graphite composites:

[0026] After mixing 3g beta titanium dioxide, 3g carbon nanotube conductive agent and 100ml N-methylpyrrolidone dispersion medium uniformly, a coating solution C was obtained, and then 100g precursor composite material B and 150ml coating solution C were mixed uniformly, and dried. Then it was transferred to a tube furnace, heated to 800°C under an argon inert atmosphere, kept for 6 hours, and then naturally cooled to room...

Embodiment 2

[0028] 1) Preparation of precursor composite material B:

[0029] 1g Fe 2 O 3 , 100ml of 1wt% graphene oxide N-methylpyrrolidone solution and 5g of aluminum-titanium composite coupling agent were mixed uniformly in 100ml of carbon tetrachloride dispersion medium by a high-energy ball mill to prepare coating liquid slurry A, and then 100g of artificial Graphite is added into it, and after uniform dispersion, spray drying is performed to obtain the precursor composite material B of transition metal oxide-coated artificial graphite;

[0030] 2) Preparation of artificial graphite composites:

[0031] At the same time, 1 g of beta titanium dioxide, 5 g of graphene conductive agent and 100 ml of carbon tetrachloride dispersion medium were mixed uniformly to obtain coating liquid C, and then 100 g of precursor composite material B and 100 g of coating liquid C were mixed uniformly, and dried. Then it was transferred to a tube furnace, heated to 700°C under an argon inert atmospher...

Embodiment 3

[0033] 1) Preparation of precursor composite material B:

[0034] 5gZrO 2 , 500ml of 1wt% graphene oxide N-methylpyrrolidone solution and 1g of aluminum-titanium composite coupling agent were mixed uniformly in 100ml of cyclohexane dispersion medium by a high-energy ball mill to make coating liquid slurry A, and then 100g of artificial graphite was mixed. Add it, after uniform dispersion, spray drying to obtain the precursor composite material B of transition metal oxide-coated artificial graphite;

[0035] 2) Preparation of artificial graphite composites:

[0036] After mixing 5g beta titanium dioxide, 1g carbon nanofibers and 100g cyclohexane dispersion medium uniformly, a coating solution C was obtained, and then 100g precursor composite material B and 200g coating solution C were mixed uniformly, dried, and then transferred to a tube In an inert argon atmosphere, the temperature was raised to 1000°C, kept for 1 h, and then naturally cooled to room temperature in an argon...

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Abstract

The invention discloses a high-capacity fast-charging negative electrode composite material which is of a multi-layer structure, an inner core is artificial graphite, a middle layer is a transition metal oxide layer coated on the surface of the inner core, the transition metal oxide is one of NiO, Fe2O3, Al2O3, ZrO2, CuO and Co3O4, and an outer layer is a beta-type titanium dioxide material layer. The invention also discloses a preparation method of the high-capacity fast-charging negative electrode composite material. According to the negative electrode composite material disclosed by the invention, the characteristics of high structural stability and high electronic conductivity of the artificial graphite in the inner core, high capacity of the transition metal oxide in the middle layer and high ionic conductivity of the lithium titanate formed in the charging and discharging process of the titanium dioxide in the outer layer are utilized, and the synergistic effect among the artificial graphite, the transition metal oxide and the lithium titanate is exerted; while the energy density of the material is improved, the cycle performance and the rate capability of the material can also be improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a high-capacity fast-charging negative electrode composite material and a preparation method thereof. Background technique [0002] With the increase in the market's requirements for the energy density of negative electrode materials and their fast charging performance, the graphite negative electrode materials used in lithium-ion batteries are required to have high energy density and at the same time, the fast charging performance of the material can also be improved. At present, the main ideas to improve the fast charging performance of high-energy graphite are to select high-density raw materials, high-temperature graphitization, surface modification and optimization of the granulation process. For example, ① granulation optimization: the carbon material is crushed to a certain particle size, secondary granulation is achieved by kneading, and finally graphitization obtains...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/52H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/483H01M4/523H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 周萨韩松游晨涛要夏晖
Owner 格龙新材料科技(常州)有限公司
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