Negative electrode material and preparation method and application thereof

A negative electrode material and negative electrode sheet technology, which is applied in the field of negative electrode materials and its preparation, can solve problems such as safety failure, battery safety performance degradation, and low graphite crystallinity, so as to prevent heavy accumulation, improve safety performance, and solve safety performance and fast The effect of charging performance

Active Publication Date: 2022-01-25
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A dense and stable SEI film helps to ensure the thermal shock performance of the battery, and when the crystallinity of the graphite surface is low, its activity will be higher, and the reaction with the electrolyte will be more intense, and excessive reaction will lead to SEI film Decomposes prematurely, releasing heat, leading to safety failure
[0003]Current graphite is usually coated with more soft / hard carbon on its surface to improve fast charging performance. However, when there are more soft / hard carbon, the crystallinity of graphite will be lower, it will inevitably cause the decline of battery safety performance, in view of this, it is necessary to provide a lithium-ion battery negative electrode material that improves safety performance and takes kinetic performance into consideration.

Method used

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  • Negative electrode material and preparation method and application thereof
  • Negative electrode material and preparation method and application thereof
  • Negative electrode material and preparation method and application thereof

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preparation example Construction

[0036] The second aspect of the present invention is to provide the preparation method of the negative electrode material, comprising the following steps:

[0037] S1, acidifying or oxidizing the carbon nanomaterials;

[0038] S2, adding the carbon nanomaterial obtained in step S1 and the metal salt corresponding to the nano metal oxide into the solvent, and mixing into a uniform solution;

[0039]S3, performing the first heat treatment on the solution obtained in step S2 to obtain a precipitated powder, and performing a second heat treatment after filtering and washing to obtain a carbon nanocomposite material loaded with nano metal oxides;

[0040] S4. Fusing the precursor of the second carbon-based material, the first carbon-based material, and the carbon nanocomposite material loaded with nano-metal oxides to obtain a semi-finished product;

[0041] S5, carbonizing, crushing, screening, and demagnetizing the semi-finished product obtained in step S4 to obtain the negative...

Embodiment 1

[0050] A negative electrode material, including graphite (Dv50=13 μm, purity greater than 99.8%) and a coating layer coated on the graphite surface; the coating layer includes pitch (softening point is about 120 ° C) and additives, the additives include Graphene and nanometer metal alumina loaded on the graphene.

[0051] The preparation method of this negative electrode material is:

[0052] 1) Add graphene oxide and aluminum nitrate (mass ratio 1:2) obtained through oxidation into ethanol, and fully mix to form a uniform solution;

[0053] 2) Add the solution into the reaction kettle, and perform solvothermal reduction at 200°C for 2 hours;

[0054] 3) Collect the sediment in the lower layer of the reaction kettle, filter, wash and dry, and then heat-treat it under an argon atmosphere at 450°C to obtain a graphene composite material loaded with metal alumina;

[0055] 4) Add graphite (Dv50=13um, purity greater than 99.8%), asphalt (softening point around 120°C) and graphen...

Embodiment 2

[0058] The difference from Example 1 is the setting of the cladding layer.

[0059] The coating layer includes pitch (the softening point is about 120°C) and additives, and the additives include carbon nanotubes and nanometer metal titanium oxide supported on the carbon nanotubes.

[0060] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides a negative electrode material and preparation and application thereof. The negative electrode material comprises a first carbon-based material and a coating layer coating the surface of the first carbon-based material; the coating layer comprises a second carbon-based material and an additive, and the additive comprises a carbon nanomaterial and a nano metal oxide loaded on the carbon nanomaterial. Compared with the prior art, the negative electrode material disclosed by the invention has the advantages that the carbon nanomaterial and the nano metal oxide are added, the nano metal oxide is loaded on the carbon nanomaterial, and the nano metal oxide and the carbon nanomaterial are mixed and dispersed more uniformly, so the safety performance of the battery is improved; the nano metal oxide with good dispersion also can achieve the purpose of preventing the carbon nano material from being re-accumulated, a channel is provided for electrolyte immersion and rapid migration of lithium ions, and the rapid charging performance of the battery can be further improved, so the problem that the safety performance and the rapid charging performance cannot be simultaneously considered in the current battery negative electrode material is solved.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products and electric vehicles because of their high energy density, good cycle performance, and no memory effect. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, electrolytes, aluminum-plastic films, etc. Among them, the commercially used lithium battery negative electrode materials are usually the first carbon-based materials, mainly graphite. During the first charging and discharging process of the lithium battery, graphite easily reacts with the electrolyte at the solid-liquid phase interface to form a solid electrolyte passivation film covering the surface of the negative electrode, referred to as SEI film. A dense and stable SEI film helps to ensure the thermal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/05
CPCH01M4/366H01M4/48H01M4/583H01M10/05Y02E60/10
Inventor 文豪于培峰马斌陈杰杨山
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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