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Hard carbon negative electrode composite material and preparation method and application thereof

A composite material and hard carbon technology, which is applied in the preparation/purification of carbon, negative electrodes, battery electrodes, etc., can solve the problems of difficulty in controlling the amount of lithium fluoride attached, inconsistent pre-lithiation degree, waste, etc., to simplify production Process flow and chemical formation process, solving SEI instability, and reducing the effect of injection volume

Inactive Publication Date: 2021-07-30
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent uses a liquid phase method to pre-lithiate the hard carbon precursor. Specifically, the lithium fluoride generated in the solution by lithium acetate or lithium oxalate and ammonium fluoride is attached to the hard carbon surface to achieve pre-lithiation. , only a small part of lithium fluoride in the system is attached to the hard carbon surface by physical adsorption, which will cause great waste and pollution, and it is difficult to control the amount of lithium fluoride attached to the hard carbon surface, resulting in batches The degree of pre-lithiation between them is inconsistent, which makes the properties of the material inconsistent in all aspects

Method used

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  • Hard carbon negative electrode composite material and preparation method and application thereof
  • Hard carbon negative electrode composite material and preparation method and application thereof

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preparation example Construction

[0044] A method for preparing a hard carbon negative electrode composite material, comprising the steps of:

[0045] Pretreatment of carbon-containing raw materials to prepare hard carbon precursors;

[0046] Mixing the hard carbon precursor with a lithium-containing compound and a binder to prepare a solid pre-lithiated hard carbon precursor;

[0047] Sintering the pre-lithiated hard carbon precursor to prepare pre-lithiated hard carbon;

[0048] Carrying out carbon coating treatment on the pre-lithiated hard carbon to form a carbon coating layer on the surface of the pre-lithiated hard carbon.

[0049] The preparation method of the hard carbon negative electrode composite material provided by one of the embodiments of the present invention comprises the following steps:

[0050] S100: Pretreat carbon-containing raw materials to prepare hard carbon precursors

[0051] In this step, by pretreating the carbon-containing raw material, impurities in the carbon-containing raw m...

Embodiment 1

[0080] This embodiment provides a hard carbon negative electrode composite material and a preparation method thereof.

[0081] (1) 100 g of sucrose is pulverized by a ball mill to obtain carbon-containing raw material particles with D50=30 μm;

[0082] (2) Carry out heat treatment under air atmosphere, the temperature of heat treatment is 200 ℃, time is 10h, prepare and obtain hard carbon precursor;

[0083] (3) Mix 9.0 g of the hard carbon precursor obtained in step (2) with 0.9 g of lithium carbonate and 0.1 g of pitch, and fuse in a mechanical fusion machine at 230 ° C and a speed of 50 rpm to obtain a surface-coated lithium compound Pre-lithiated hard carbon precursors;

[0084] (4) In an inert atmosphere, the temperature was raised to 850°C at a heating rate of 5°C / min, and the temperature was kept at 3h. The pre-lithiated hard carbon precursor was sintered to prepare the pre-lithiated hard carbon, and cooled to room temperature. The pre-lithiated hard carbon is pulveri...

Embodiment 2

[0087] This embodiment provides a hard carbon negative electrode composite material and a preparation method thereof. The difference from Example 1 is that in step (1), the carbon-containing raw material is replaced by coconut shells from sucrose, and the coconut shells are also pulverized. The material D50=100 μm. The particle size of the finished hard carbon negative electrode composite material finally obtained is D50=16.2 μm, the thickness of the carbon coating layer is 200 nm, and the carbon coating layer accounts for 3.5% by weight.

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Abstract

The invention relates to a hard carbon negative electrode composite material and a preparation method and application thereof, and the preparation method comprises the following steps: pretreating a carbon-containing raw material to prepare a hard carbon precursor; mixing the hard carbon precursor with a lithium-containing compound and a binder to prepare a solid pre-lithiated hard carbon precursor; carrying out sintering treatment on the pre-lithiated hard carbon precursor to prepare pre-lithiated hard carbon; and carrying out carbon coating treatment on the pre-lithiated hard carbon to form a carbon coating layer on the surface of the pre-lithiated hard carbon. Exogenous lithium is introduced into the surface and the bulk phase of hard carbon to form a lithium-carbon compound, so that a certain amount of lithium is filled in a stable structure and pores of the hard carbon in advance, and the consumption of effective lithium in the battery caused by first formation is made up. A carbon coating layer is matched to reduce the defects of the hard carbon surface and cover the lithium-carbon compound with relatively high chemical activity, so that the lithium supplement effect can be achieved, the side reaction of an active substance and an electrolyte can be reduced, the first coulombic efficiency can be synergistically improved, and the cycle life of the battery can be prolonged.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a hard carbon negative electrode composite material and a preparation method and application thereof. Background technique [0002] Due to the frequent mileage anxiety in the experience of using electric vehicles in the current consumer market, the research and development of power batteries is increasingly developing in the direction of fast charging. The current fast-charging batteries mainly use graphite as the negative electrode. The fast-charging effect is achieved by reducing the surface density and compaction density, but it will also reduce the energy density of the battery, and the pure use of graphite as the negative electrode also has its rate limit. It is an unacceptable result for the electric vehicle consumer market. If the current negative electrode material is changed from simply using graphite to using a hard carbon material or a composite material composed ...

Claims

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Application Information

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IPC IPC(8): C01B32/05C01D15/08H01M4/36H01M4/587H01M4/62H01M10/052H01M10/0525
CPCC01B32/05C01D15/08H01M4/366H01M4/587H01M4/628H01M4/625H01M10/052H01M10/0525H01M2004/021H01M2004/027C01P2004/80C01P2006/40C01P2004/61C01P2004/64C01P2004/62Y02E60/10
Inventor 邱昭政李冰梁世硕李文龙赵育松张永庆
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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