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Negative electrode active material and preparation method thereof

A technology of active material and negative electrode, applied in the field of negative electrode active material and its preparation, can solve the problems of silicon particle cracking and pulverization, deterioration of electrochemical performance, etc., achieve buffer volume expansion, excellent electrochemical performance, and improve ionic conductivity Effect

Pending Publication Date: 2021-12-21
LANXI ZHIDE ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the charging and discharging process of silicon-based materials, the formation and decomposition of silicon-lithium alloys are accompanied by huge volume changes, which will lead to the cracking and pulverization of silicon particles, the contact reaction between the silicon surface and the electrolyte, and the repeated formation of SEI films, which will deteriorate the electrochemical performance.

Method used

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

Examples

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preparation example Construction

[0025] The preparation method provided by the present invention comprises the following steps:

[0026] (1) A conductive layer is coated on the surface of the silicon-based material by chemical vapor deposition;

[0027] (2) Mixing the product of step (1) with the fast ion conductor material, uniformly dispersing it into pure water, then filtering and drying the mixed solution to complete the coating of the ion-conducting layer to obtain the negative electrode active material.

[0028] In some embodiments, the silicon-based material includes, but is not limited to, elemental silicon, silicon-oxygen compounds, silicon alloys, doped-modified silicon compounds, silicon nanowires, etc. The diameter D50 is preferably 0.1 to 20 μm, more preferably 1 to 10 μm. A suitable particle size can improve the processability of the material and reduce the volume expansion effect of silicon.

[0029] In some embodiments, the temperature of the chemical vapor deposition is controlled to be 500-...

Embodiment 1

[0033] The silicon oxide particles are uniformly dispersed in pure water, and 1% mass fraction of single-walled carbon nanotubes (CNTs) are added. Silica particles of CNTs. The silicon oxide particles with CNTs attached to the surface were loaded into a CVD furnace, heated to 950 °C, and acetylene with a flow rate of 9L / min, hydrogen gas with a flow rate of 9L / min and argon with a flow rate of 18L / min were introduced, and the deposition time was 1h. Acetylene is cracked at high temperature to form cracked carbon covering the surface of CNTs and particles to complete the coating of the conductive layer. The structure of the conductive layer is similar to the structure of reinforced concrete, in which the reinforced phase CNT is equivalent to steel, and the continuous phase cracked carbon is equivalent to cement. To strengthen and stabilize, the mass ratio of CNT to cracked carbon is 0.3:1, and the thickness of the conductive layer is 60nm.

[0034] Disperse the above product e...

Embodiment 2~5

[0036] The same method as in Example 1 was followed, except that the mass ratio of CNT to carbon matrix and the Young's modulus of CNT were changed.

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Abstract

The invention discloses a negative electrode active material and a preparation method thereof. The active material comprises a silicon-based core, a conductive layer and a conductive ion layer. The active material is characterized in that the surface of the core is coated with the conductive layer, the surface of the conductive layer is coated with the conductive ion layer, the conductive layer comprises a carbon composite material, and the conductive ion layer comprises a fast ion conductor material. According to the invention, CNT is used as a reinforcement phase and carbon is used as a continuous phase to form a conductive layer of a reinforced concrete-like structure, so that the negative electrode active material has the characteristics of high strength, obdurability and the like, volume expansion can be effectively buffered, and particle breakage can be prevented; Young modulus of CNT can be controlled, and the strength of the conductive layer can be controlled, thereby ensuring excellent cycle and rate performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a negative electrode active material and a preparation method thereof. Background technique [0002] Silicon-based anode materials have become the most potential anode materials for next-generation high-energy-density lithium batteries due to their ultra-high specific capacity, low electrochemical lithium intercalation potential, and abundant reserves. However, during the charging and discharging process of silicon-based materials, the formation and decomposition of silicon-lithium alloys are accompanied by huge volume changes, which will lead to the cracking and pulverization of silicon particles, the contact reaction between the silicon surface and the electrolyte, and the repeated formation of SEI film, which will deteriorate the electrochemical performance. . At present, the problem of using silicon anodes is mainly solved through material design such as nanomete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/625H01M4/386H01M10/0525Y02E60/10
Inventor 陈青华胡盼房冰姚林林其他发明人请求不公开姓名
Owner LANXI ZHIDE ADVANCED MATERIALS CO LTD
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