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Nano-copper coated porous nano silicon composite material as well as preparation method and application thereof

A composite material and nano-silicon technology, applied in the field of chemical energy storage, can solve the problems of complex process, high cost, and difficulty in mass production, and achieve the effect of overcoming low electronic conductivity, low cost and simple method.

Inactive Publication Date: 2015-10-14
SHANGHAI INST OF SPACE POWER SOURCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are costly and complicated, and are not easy to produce in large quantities.

Method used

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  • Nano-copper coated porous nano silicon composite material as well as preparation method and application thereof
  • Nano-copper coated porous nano silicon composite material as well as preparation method and application thereof
  • Nano-copper coated porous nano silicon composite material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment

[0024] First, the porous nano-Si powder prepared by the acid etching method was plated with copper on the surface of the porous Si by an electroless copper plating method to prepare a nano-copper-coated porous nano-silicon composite material. The preparation steps are as follows: activation pretreatment, under ultrasonic conditions, the porous nano Si powder prepared by acid etching method is mixed with metal powder, such as zinc or tin metal powder, and dispersed in 0.1~20g L -1 In the silver ammonia solution or silver nitrate solution activation solution, stir slowly until the surface of the porous nano-silicon particles produces the active site Ag simple substance, and complete the activation to increase the active surface. This step is to ensure the hydrophilicity and appropriate roughness of the Si particle surface. And good coating adhesion; then, activate the pretreated porous Si powder for electroless copper plating. After filtering, washing and drying, the copper-modi...

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Abstract

The invention discloses a nano-copper coated porous nano silicon composite material as well as a preparation method and application thereof. The method comprises the following steps: (1) performing activating pretreatment on a porous nano silicon powder material prepared from an acid etching silicon allay; and (2) dispersing the porous nano silicon powder material after being subjected to activating pretreatment in an electroless copper plating solution, performing electroless copper plating, filtering, washing and drying so as to obtain the nano-copper coated porous nano silicon composite material. As being used as a negative material of a lithium ion battery, the nano-copper coated porous nano silicon composite material provided by the invention has very high specific discharge capacity, charge-discharge cycling stability and excellent charge-discharge power characteristic; the specific discharge capacity of the material used as a negative material is far higher than that of a graphite negative material in an existing lithium ion battery; as the cost of preparation of porous nano silicon powder and the cost of electroless copper plating are low, the preparation method of the material is simple and easy to operate, the low-cost continuous and large-scale production is realized, and the method is suitable for being used in the production of a new-generation high-performance lithium ion battery silicon negative material.

Description

technical field [0001] The invention belongs to the field of chemical energy storage, and in particular relates to a negative electrode material of a lithium ion battery: nanometer copper-coated porous silicon composite material. The material is made of porous silicon formed by etching silicon alloy with acid, and then electroless plating nano-copper. Because the material has a high discharge specific capacity, charge-discharge cycle stability and excellent charge-discharge power characteristics, it can be used to prepare high-energy lithium-ion batteries for electric vehicles, new portable electronic appliances, mobile phones, iPads, etc. Background technique [0002] A chemical power source is a device that converts chemical energy into electrical energy. Secondary batteries can store electrical energy and use it repeatedly, and can also store electrical energy converted from light energy, wind energy, etc. Common secondary batteries currently on the market are: lead-aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/46
CPCY02E60/10
Inventor 李纯莉江志裕张平马丽萍
Owner SHANGHAI INST OF SPACE POWER SOURCES
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