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Silicon-carbon negative electrode material as well as preparation method thereof and electrode comprising silicon-carbon negative electrode material

A negative electrode material, silicon carbon technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of battery electrochemical performance decline, porous silicon method is cumbersome, irreversible capacity loss, etc., to improve cycle performance and shorten production Cycle time, the effect of reducing production costs

Active Publication Date: 2018-08-17
SOUNDON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The first object of the present invention is to provide a method for preparing a silicon-carbon negative electrode material, so as to solve the technical problems of the existing silicon-carbon negative electrode material, such as high raw material cost or low silicon dioxide content in the raw material, and cumbersome preparation methods for porous silicon. Solve the technical problem that the current silicon-carbon anode material has an irreversible capacity loss that causes the electrochemical performance of the battery to decline

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  • Silicon-carbon negative electrode material as well as preparation method thereof and electrode comprising silicon-carbon negative electrode material
  • Silicon-carbon negative electrode material as well as preparation method thereof and electrode comprising silicon-carbon negative electrode material
  • Silicon-carbon negative electrode material as well as preparation method thereof and electrode comprising silicon-carbon negative electrode material

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preparation example Construction

[0033] One aspect of the present invention provides a method for preparing a silicon-carbon negative electrode material, comprising the following steps:

[0034] a) providing zeolite powder, the zeolite powder is sequentially subjected to reduction treatment and purification treatment to obtain porous silicon;

[0035] b) After carbon-coating the porous silicon with a pyrolytic carbon source and graphite, a silicon-carbon anode material is obtained.

[0036] In the preparation method of the silicon-carbon negative electrode material of the present invention, zeolite powder is used as the raw material for the preparation of porous silicon. The zeolite is not only low in cost, but also has a higher silica content and higher quality than other low-cost silicon sources such as rice husks. The fraction is about 65%. At the same time, using zeolite powder as the silicon source material can also reduce the steps of ashing when rice husk is used as the silicon source, simplify the pre...

Embodiment 1

[0058] This embodiment is a method for preparing a silicon-carbon negative electrode material, comprising the following steps:

[0059] a) Take a certain amount of 300-mesh natural zeolite powder (silicon dioxide content is 65wt%), add dilute hydrochloric acid with a mass fraction of 5wt%, repeatedly wash and suction filter three times, then wash with water until neutral and dry;

[0060] b) get dried zeolite powder 60g and mix with 32.76g magnesium powder (the molar ratio is Mg / SiO 2 =2.1), the mixture of zeolite powder and magnesium powder is placed in a tube furnace and calcined at a high temperature of 650°C for 4h, so that the magnesium powder can fully reduce the silicon dioxide in the zeolite powder;

[0061] c) washing the calcined product with HCl with a mass fraction of 5 wt% to remove MgO generated by the magnesia thermal reduction reaction and other impurities in the zeolite powder, then repeatedly washing with water and drying; then using an ethanol solution of HF...

Embodiment 2

[0066] This embodiment is a method for preparing a silicon-carbon negative electrode material. The difference from Example 1 is that the weight ratio of porous silicon, glucose and graphite is 2:5:3, that is, in step d), 20g of porous silicon is weighed The material is dispersed in an ethanol solution, 50g of glucose is weighed, 30g of graphite is added to the ethanol solution of porous silicon, ball milled at 500rpm for 5h under a vacuum atmosphere, and then spray-dried to obtain the precursor of the silicon-carbon composite material. The preparation process of other steps The same as in Example 1, the finally obtained silicon carbon negative electrode material is denoted as SiPCG253.

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Abstract

The invention provides a silicon-carbon negative electrode material as well as a preparation method thereof and an electrode comprising the silicon-carbon negative electrode material, and relates to the technical field of battery materials. The preparation method of the silicon-carbon negative electrode material comprises the following steps: a) providing zeolite powder which is sequentially subjected to reduction treatment and purifying treatment to obtain porous silicon; and b) using a pyrolysis carbon source and graphite to coat porous silicon to obtain the silicon-carbon negative electrodematerial. The preparation method can be utilized for solving the technical problems that an existing silicon-carbon negative electrode material is high in cost, is low in content of silicon dioxide in the raw material, and is complex in a method for preparing the porous silicon, especially can be used for solving the technical problem that an existing silicon-carbon negative electrode material has irreversible capacity loss, and is used for obtaining the silicon-carbon negative electrode material with excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a silicon-carbon negative electrode material, a preparation method thereof, and an electrode containing the same. Background technique [0002] At present, commercial lithium-ion batteries mainly use lithium cobalt oxide and lithium iron phosphate as the positive electrode, and graphite as the negative electrode. Although the positive and negative electrode materials have many advantages, their low capacity can no longer meet the growing demand for high energy density. Silicon has attracted widespread attention due to its high theoretical specific capacity (about 11 times that of graphite anode), and is expected to become the anode material for next-generation high-energy-density batteries. However, the biggest problem with silicon is that it has a serious volume change during the lithium-deintercalation process, which leads to the separation of the active material and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 徐艳红苗力孝朱坤磊
Owner SOUNDON NEW ENERGY TECH CO LTD
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