Negative electrode material and preparation method thereof, negative electrode plate and secondary battery

A negative electrode material and nanosphere technology, which is applied in the direction of secondary batteries, negative electrodes, battery electrodes, etc., can solve the problems of large volume expansion and poor conductivity of negative electrode materials, so as to improve cycle life, avoid failure, and reduce electron transmission resistance. Effect

Pending Publication Date: 2022-03-01
惠州锂威新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the market puts forward higher capacity and energy density requirements for batteries, there are still defects such as poor conductivity and large volume expansion in negative electrode materials.

Method used

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  • Negative electrode material and preparation method thereof, negative electrode plate and secondary battery
  • Negative electrode material and preparation method thereof, negative electrode plate and secondary battery
  • Negative electrode material and preparation method thereof, negative electrode plate and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of negative electrode material, comprising the following steps:

[0039] Step S1. Dissolve 15g of glucose and 1g of cetyltrimethylammonium bromide (CTAB) in 5ml of pure water with stirring, transfer to a hydrothermal reactor, heat to 180°C for 12 hours, and wait for it to cool to room temperature Remove the coke layer between the solution and the air, collect the product by centrifugation, and wash repeatedly with pure water and ethanol until the washing solution is white and transparent, and finally dry to obtain carbon nanospheres, as figure 1 shown.

[0040] Step S2, stirring and dissolving one or more metal chlorides in a solvent, the solvent is a solution of water and ethanol in a volume ratio of 1:2 (the ratio is not lower than 1:1), and the solid is completely dissolved Afterwards, the carbon nanosphere template was added, placed in an environment of 40°C and stirred for 12 hours, and then centrifuged and washed to collect the product to obt...

Embodiment 2

[0044] The difference from Example 1 is that the weight-to-number ratio of hollow nanospheres, ammonium perrhenate, hydroxylamine hydrochloride and thiourea in step S4 is 6:0.4:2.1:1.3.

[0045] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0047] The difference from Example 1 is that the weight-to-number ratio of hollow nanospheres, ammonium perrhenate, hydroxylamine hydrochloride and thiourea in step S4 is 5:0.4:2.1:1.3.

[0048] The rest are the same as in Embodiment 1, and will not be repeated here.

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PUM

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Abstract

The invention belongs to the technical field of negative electrode materials, and particularly relates to a negative electrode material and a preparation method thereof, a negative electrode plate and a secondary battery, the negative electrode material comprises a hollow nanosphere and a sulfur-rhenium compound structure layer coating the outer surface of the hollow nanosphere, the hollow nanosphere comprises M elements, and the M elements are selected from one or more of Ni, Co, Mn, Fe, Al, La, Y and Zr. The negative electrode material provided by the invention has various metals, can effectively improve the conductivity of the material and reduce the electron transfer resistance of the material, has a hollow nanostructure, and can limit the volume expansion of the material in the continuous charging and discharging process, avoid the material failure and prolong the cycle life of the material.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a negative electrode material, a preparation method thereof, a negative electrode sheet and a secondary battery. Background technique [0002] Lithium-ion batteries have been continuously updated with changes in market demand since their commercialization. The positive electrode materials that have been commercialized today include lithium cobalt oxide, lithium iron phosphate, and nickel-cobalt-manganese ternary materials, etc., but the negative electrode materials still remain in artificial graphite. As the market puts forward higher capacity and energy density requirements for batteries, there are still defects such as poor conductivity and large volume expansion in negative electrode materials. Contents of the invention [0003] One of the purposes of the present invention is to provide a negative electrode material with a variety of metals, which ca...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/587H01M4/133H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/587H01M4/624H01M4/628H01M4/133H01M10/0525B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 蔡泽林陈杰杨山
Owner 惠州锂威新能源科技有限公司
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