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Electrode composite material and preparation method of electrode composite material

A composite material and electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high cost and human body danger, and achieve the effects of improved electrical conductivity, easy control of conditions, and simple process

Active Publication Date: 2015-08-19
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some disadvantages in this invention: the gaseous reagent involved in the vapor-liquid-solid method is very dangerous to the human body and is also very expensive, and the process of forming silicon nanowires on the negative electrode current collector requires precious metal gold to catalyze

Method used

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  • Electrode composite material and preparation method of electrode composite material
  • Electrode composite material and preparation method of electrode composite material
  • Electrode composite material and preparation method of electrode composite material

Examples

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preparation example Construction

[0036] The present invention also discloses a preparation method of an electrode composite material, comprising the following steps:

[0037] Put the reaction raw materials into the reaction container, the reaction raw materials include fluorosilicate and the metal as the reducing agent, or metal magnesium and silicon dioxide, insert the electrode into the reaction container, the electrode includes the positive electrode and the negative electrode, between the positive electrode and the negative electrode Applying a voltage; heating and stirring the reaction raw materials in a protective gas atmosphere, continuing to heat the reaction raw materials to the first temperature, keeping the heat for a predetermined time, cooling to obtain a reduced product, washing and drying the reduced product to obtain silicon; treating the silicon through a silver mirror reaction An electrode composite is obtained.

[0038] In a specific embodiment, the reaction starting materials include fluor...

Embodiment 1-1

[0078] Weigh the reaction raw materials sodium fluorosilicate and metal sodium according to the weight ratio of 3:1, put the reaction raw materials into a clean three-necked glass bottle, and pass through N 2 Remove the air in the bottle, add an electrode and a stirring head into the bottle, the electrode includes a positive electrode and a negative electrode. Start stirring, then continue to heat the reaction raw materials to the first temperature of 160° C., keep the temperature for 2 hours, stop stirring, and cool to room temperature. Transfer the obtained reduction product into a clean beaker filled with pure water, wash and vacuum filter, wash the product after suction filtration with pure water for 3 times, then further wash with electronically pure hydrochloric acid and vacuum filter, and finally heat it at 60°C Dry under vacuum for 12 hours.

[0079] Weigh 0.078g of silver nitrate and dissolve it in 200mL of pure water, add a few drops of ammonia water to adjust the p...

Embodiment 1-2

[0082] In Example 1-2, the electrode additional voltage is 3.4V, and the corresponding first temperature is 170° C., and the rest of the preparation method is the same as that of Example 1-1.

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Abstract

The invention relates to an electrode composite material and a preparation method of the same. The electrode composite material comprises silicon and silver, which covers the surface of the silicon. The electrode composite material obtained by the preparation method disclosed in the invention can well bear the cathode volume change without generating powdering phenomenon in a charge-discharge process. The nano-structured silver coating the silicon surface further enhances the conductivity of the electrode composite material, thus improving the electrochemical performance of the electrode composite material. In addition, the preparation method of the electrode composite material is simple, and is easy to control, thus having industrialized application prospects.

Description

technical field [0001] The invention relates to an electrode composite material, in particular to an electrode composite material containing silicon and silver. [0002] The invention also relates to a preparation method of the electrode composite material. Background technique [0003] The widespread use of new energy by humans has led to a rapid increase in the demand for large-capacity secondary batteries. For example, aerospace, medical equipment, handheld electronic products, and electric vehicles all require batteries with large weight-specific capacity and / or volume-specific capacity. The development of lithium-ion battery technology has partially met the requirements of the market, but the demand for higher capacity batteries has never stopped. The theoretical specific capacity of lithium-ion batteries using graphite carbon as the negative electrode is only 372mAhg -1 . [0004] Therefore, people have been working on researching anode materials with higher lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 陈璞陈渊
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD