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Mixed negative electrode material, negative pole piece and preparation method thereof

A technology of negative electrode materials and negative electrode sheets, which is applied in the field of battery materials, can solve problems such as difficult control and complex process of mixed negative electrode materials, and achieve the effects of easy production control, high compaction density and long cycle life

Inactive Publication Date: 2019-09-24
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a mixed negative electrode material and negative electrode sheet and a preparation method thereof in order to overcome the complex and difficult-to-control problems of the existing methods for preparing mixed negative electrode materials

Method used

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  • Mixed negative electrode material, negative pole piece and preparation method thereof
  • Mixed negative electrode material, negative pole piece and preparation method thereof

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preparation example Construction

[0017] A third aspect of the present invention provides a method for preparing a negative electrode sheet, wherein the preparation method includes the following steps:

[0018] (1) the first carrier and the second carrier are physically mixed to obtain the mixed negative electrode material of the present invention;

[0019] (2) The mixed negative electrode material is mixed with a conductive agent and a binding agent, and the resulting mixed material is coated on the current collector.

[0020] In the present invention, in step (1), the physical mixing method is not particularly limited, as long as the first carrier and the second carrier can be mixed evenly, for example, the physical mixing can be done in a ball mill, a mixer or in a three-dimensional mixer.

[0021] In the present invention, the time of the physical mixing can be selected according to the mixing effect, as long as the materials are mixed uniformly within a certain period of time, preferably, the time of the...

Embodiment 1

[0032] (1) 440g of graphite with a median particle size of 10 μm and 440g of soft carbon with a median particle size of 10 μm were stirred and mixed by a stirrer for 2h to obtain a mixed negative electrode material;

[0033] (2) Stir and disperse the mixture of 1000g nitrogen methyl pyrrolidone solvent and 30g PVDF binder to obtain glue;

[0034] (3) 90g carbon black is uniformly mixed with the above-mentioned glue solution to obtain slurry A (viscosity is 5000cp);

[0035] (4) Add the mixed negative electrode material that step (1) obtains in the slurry A, and obtain the slurry B by mixing;

[0036] (5) Coat the slurry B on an aluminum foil (thickness: 12 μm, the same below), the formed coating is 65 μm, and dry at 115°C to obtain a negative electrode sheet.

Embodiment 2

[0038] (1) 560g of graphite with a median particle size of 1 μm and 240g of soft carbon with a median particle size of 20 μm were stirred and mixed by a stirrer for 1h to obtain a mixed negative electrode material;

[0039] (2) Stir and disperse the mixture of 1000g nitrogen methyl pyrrolidone solvent and 50g PVDF binder to obtain glue;

[0040] (3) 150g carbon black is uniformly mixed with the above-mentioned glue solution to obtain slurry A (viscosity is 10000cp);

[0041] (4) Add the mixed negative electrode material that step (1) obtains in the slurry A, and obtain the slurry B by mixing;

[0042] (5) Coat the slurry B on the aluminum foil to form a coating with a thickness of 100 μm, and dry it at 150° C. to obtain a negative electrode sheet.

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Abstract

The invention relates to the field of battery materials, and discloses a mixed negative electrode material, a negative pole piece and a preparation method thereof. The mixed negative electrode material is prepared by physically mixing a first carrier and a second carrier, wherein the first carrier is at least one of lithium, graphite, silicon, tin and germanium, and the second carrier is at least one of lithium titanate, soft carbon and hard carbon. The mixed negative electrode material of the invention has the advantages of high gram capacity and compacted density, good fast charging performance of batteries and long cycle life. The mixed negative electrode material does not need to process a precursor in the preparation process, and is short in process path and easy to perform production control.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a mixed negative electrode material, a negative electrode sheet containing the mixed negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of new energy vehicles, the market's recognition of new energy vehicles is getting higher and higher. In the process of increasing acceptance, the mileage, charging speed, service life and safety performance of new energy vehicles have always been the focus and focus of users. [0003] As the power source of new energy vehicles, the battery basically determines the car's mileage, charging speed, service life, safety performance and other user concerns. Among them, the mileage is determined by the energy density of the battery, while the charging speed is determined by the negative electrode material of the battery. At present, there are two types of anode materials for lithium-i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M4/485H01M10/0525
CPCH01M4/362H01M4/386H01M4/387H01M4/485H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 康利斌唐堃张开周潘广宏康丹苗王璐璘
Owner CHNA ENERGY INVESTMENT CORP LTD