Hard carbon negative electrode material, preparation method thereof, negative pole plate and battery

A technology of negative electrode material and negative electrode material layer, which is applied to batteries, battery electrodes, secondary batteries, etc., can solve the problems of poor battery cycle life and high temperature performance, difficulty in uniformly covering hard carbon surfaces, and insufficiently dense carbon layers. Reduce battery flatulence, improve cycle life and high temperature performance, and reduce the effect of agglomeration

Active Publication Date: 2018-11-23
宁波柔创纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating of this type of method is uneven, and it is difficult to uniformly cover all functional groups and defects on the surface of the hard carbon, and the coated carbon layer is not dense enough, and the electrol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An embodiment of the present invention provides a hard carbon negative electrode material. The hard carbon negative electrode material includes a hard carbon sphere matrix, and an oxide layer is coated on the surface functional group positions and surface defect positions on the hard carbon sphere matrix. The hard carbon negative electrode material provided by the invention is coated with an oxide layer on the surface functional group positions and surface defect positions of the hard carbon sphere matrix, which can avoid the side reactions of the hard carbon surface defects and functional groups in contact with the organic electrolyte, resulting in battery capacity loss. ;

[0023] Further, the oxide layer has a thickness of 0.1-2 nm. Excessive thickness of the oxide layer will lead to an increase in ineffective mass, reduce the gram capacity of the hard carbon negative electrode, and increase the cost; it may also cause the coating particles to be too large and the su...

Embodiment 2

[0030] The present invention also provides a method for preparing a hard carbon negative electrode material, which uses the atomic layer deposition method to coat the oxide layer on the surface functional group positions and surface defect positions on the hard carbon sphere substrate;

[0031] Specifically: S11, put the hard carbon sphere matrix powder into a porous container; put the porous container into the ALD reaction chamber, and then repeatedly vacuumize and replace nitrogen for at least three times; place the hard carbon sphere matrix powder in an atmosphere of nitrogen or argon Under fluidization (fluidization pressure is 1-1000torr) or by rotating the porous container to achieve powder dispersion effect;

[0032] S12, heating the temperature of the reaction chamber to 300-1000 Kelvin, keeping at the set temperature for 5-30 minutes, and the pressure in the reaction chamber is lower than 0.01 atmospheric pressure;

[0033] S13, open the air outlet valve, pulse the cl...

Embodiment 3

[0048] The present invention also provides a negative electrode sheet, including a negative electrode current collector, the surface of the negative electrode current collector is coated with a hard carbon negative electrode material layer, and the hard carbon negative electrode material layer includes the hard carbon negative electrode material described in Embodiment 1 Alternatively, the hard carbon negative electrode material layer includes the hard carbon negative electrode material prepared by the preparation method in Example 2. The negative electrode sheet prepared by using the hard carbon negative electrode material provided by the invention has relatively high reversible capacity.

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Abstract

The invention belongs to the technical field of a battery, and particularly relates to a hard carbon negative electrode material. The hard carbon negative electrode material comprises a hard carbon sphere matrix, wherein oxide layers are coated at a surface functional group position and a surface defect position on the hard carbon sphere matrix. The invention also provides a preparation method ofthe hard carbon negative electrode material. The oxide layers are coated at the surface functional group position and the surface defect position on the hard carbon sphere matrix by employing an atomic layer deposition method. The invention also provides a negative pole plate. The negative pole plate comprises a negative electrode current collector, wherein a hard carbon negative material layer iscoated on a surface of the negative electrode current collector and comprises the hard carbon negative electrode material. The invention also provides the battery. The battery comprises a positive pole plate and also comprises the negative pole plate. In the hard carbon negative electrode material, the oxide layers are coated at the surface functional group position and the surface defect position of the hard carbon sphere matrix, the surface defect of hard carbon and the functional group is in contact with an organic electrolyte to generate side reaction can be prevented, and the performanceof the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a hard carbon negative electrode material, a preparation method thereof, a negative electrode sheet and a battery. Background technique [0002] Hard carbon refers to carbon that is difficult to hard carbonize. It has a high reversible specific capacity, generally 500-700mAh / g; it also has the characteristics of high specific capacity, good rate performance, and excellent rate and cycle performance, as well as low temperature characteristics. As a negative electrode material for lithium-ion batteries, sodium-ion batteries and potassium-ion batteries, hard carbon has a stable structure, long charge-discharge cycle life, and good rate performance, which can meet the high-power charge-discharge requirements of lithium-ion batteries for electric vehicles. In addition, hard carbon has better compatibility with propylene carbonate (PC)-based electrolytes than graphite. ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/133H01M10/0525H01M10/054
CPCH01M4/133H01M4/362H01M4/583H01M4/62H01M4/628H01M10/0525H01M10/054H01M2220/20Y02E60/10
Inventor 解明
Owner 宁波柔创纳米科技有限公司
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