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A kind of modified negative electrode material and its preparation method and application

A negative electrode material and modification technology, applied in the field of modified negative electrode material and its preparation, can solve the problems of inability to prevent particle pulverization, inability to effectively absorb tension, lack of ductility of carbon layer, etc., so as to reduce the generation and delay of SEI film. The effect of electrolyte consumption and reduction of side reaction rate

Active Publication Date: 2021-06-11
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbon layer lacks ductility and cannot effectively absorb the tension generated by volume expansion during the charging and discharging process of the electrode, so it cannot prevent the pulverization of delayed particles

Method used

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  • A kind of modified negative electrode material and its preparation method and application
  • A kind of modified negative electrode material and its preparation method and application
  • A kind of modified negative electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The schematic diagram of the structure of the modified negative electrode material in this embodiment is as follows figure 1 shown by figure 1 It can be seen that the modified negative electrode material described in this example includes Si / SiO x The negative electrode material and the polymer coating layer on its surface, the polymer coating layer contains network polymer and polymer colloid particles, and the polymer colloid particles are dispersed in the network polymer .

[0057] like figure 1 The preparation method of described modified negative electrode material; The Si / SiO that the present embodiment selects x The composition of the negative electrode material of the negative electrode material is 100% SiO; The method that its surface is coated with polymer coating layer is as follows:

[0058] (1) Ultrasonic dispersion of polyacrylonitrile colloidal particles in water to obtain a uniform dispersion, the particle size of the polyacrylonitrile colloidal part...

Embodiment 2

[0063] The schematic diagram of the structure of the modified negative electrode material in this embodiment is as follows figure 2 As shown, it can be seen from the figure that the modified negative electrode material described in this embodiment includes Si / SiO x The negative electrode material and the carbon material layer located on its surface, the carbon material is amorphous carbon, the surface of the carbon material layer contains a polymer coating layer, and the polymer coating layer contains a network polymer and polymer colloid particles, the polymer colloid particles are dispersed in the network polymer.

[0064] The difference between this embodiment and embodiment 1 is that the selected Si / SiO x The surface of the negative electrode material is coated with an amorphous carbon layer, the thickness of the amorphous carbon layer is 5nm, and other components are completely the same as in Example 1, (that is, the surface of the negative electrode material of SiO in ...

Embodiment 3

[0067] The difference between this example and Example 1 is that the modified negative electrode material obtained in Example 1 is heat-treated at 250° C. for 1.5 h, and then cooled to obtain the modified negative electrode material described in this example. Other conditions are the same as in Example 1. Compared to the exact same.

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Abstract

The invention relates to a modified negative electrode material and its preparation method and application. The modified negative electrode material contains Si / SiO x The negative electrode material and the polymer coating layer coated on its surface, the polymer coating layer contains polymer colloid particles and network macromolecular polymers, the coating energy of the polymer coating layer of the present invention Effectively improve the brokenness, electrode pulverization and peeling of the modified negative electrode material during processing and use, optimize its cycle performance, and prolong its cycle life.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a modified negative electrode material and its preparation method and application. Background technique [0002] Due to its high energy density, high voltage and environmental friendliness, lithium-ion batteries are widely used in portable power devices (such as mobile phones, computers) and electric vehicles. However, due to the influence of battery materials, conductive additives, and binders, it is currently difficult to prepare lithium-ion batteries with high reversible capacity, high cycle stability, and high rate performance. [0003] Anode materials are very important components of lithium-ion batteries, which directly affect the energy density and electrochemical performance of lithium-ion batteries. Excellent negative electrode materials can improve the reversible capacity, cycle performance, and rate performance of lithium-ion batteries; otherwise, it will cause the perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/386H01M4/483H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 姚毅李婷于清江江柯成郭玉国
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD