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High-performance hollow silicon-carbon graphene ternary composite negative electrode material and preparation method thereof

A ternary composite, negative electrode material technology, applied in electrical components, battery electrodes, electrochemical generators, etc., can solve the problems of particle cracking and pulverization, difficult to form solid electrolyte membrane, etc., to achieve less environmental pollution, avoid local temperature overshoot The effect of high and stable electrochemical performance

Inactive Publication Date: 2018-09-28
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a high-performance hollow silicon-carbon-graphene ternary composite negative electrode material and a preparation method thereof in order to solve the above-mentioned problem that it is difficult to form a stable solid electrolyte membrane due to particle breakage and pulverization caused by the volume change of silicon.

Method used

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  • High-performance hollow silicon-carbon graphene ternary composite negative electrode material and preparation method thereof
  • High-performance hollow silicon-carbon graphene ternary composite negative electrode material and preparation method thereof
  • High-performance hollow silicon-carbon graphene ternary composite negative electrode material and preparation method thereof

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Embodiment 1

[0033] A method for preparing a high-performance hollow silicon-carbon-graphene ternary composite negative electrode material, comprising the following steps:

[0034]1) Preparation of carbon spheres: Dissolve 3.5g of glucose in 60g of deionized water, then add 1g of methanol and stir evenly, add dropwise 1mol / L sodium hydroxide solution, adjust the pH to 8, stir evenly, put into the reaction kettle, and Take it out after reacting at 180°C for 8 hours, and after natural cooling, take out the liner of the reaction kettle, filter with suction and wash the filter cake with ethanol to obtain a carbon sphere template, and dry the carbon sphere template at 60°C for later use;

[0035] 2) Preparation of C@SiO 2 : Disperse 1g of PVP and 0.2g of carbon spheres in a solution of 30mL of ethanol and 30mL of deionized water, and ultrasonically crush for 2 hours to obtain a suspension of carbon spheres. Add 9 mL of ammonia water dropwise to the suspension of carbon spheres under stirring to...

Embodiment 2

[0039] A method for preparing a high-performance hollow silicon-carbon-graphene ternary composite negative electrode material, comprising the following steps:

[0040] 1) Preparation of carbon spheres: Dissolve 3.5g of glucose in 60g of deionized water, then add 2g of methanol and stir evenly, add dropwise 1mol / L sodium hydroxide solution, adjust the pH to 8.5, stir evenly, put into the reaction kettle, and After reacting at 180°C for 10 h, take it out, and after natural cooling, take out the liner of the reaction kettle, filter with suction and wash the filter cake with ethanol to obtain a carbon sphere template, and dry the carbon sphere template at 60°C for later use;

[0041] 2) Preparation of C@SiO 2 : Disperse 1g of PVP and 0.2g of carbon spheres in a solution of 30mL of ethanol and 30mL of deionized water, and ultrasonically crush for 2 hours to obtain a suspension of carbon spheres. Add ammonia water dropwise to the suspension of carbon spheres under stirring to adjust...

Embodiment 3

[0046] A method for preparing a high-performance hollow silicon-carbon-graphene ternary composite negative electrode material, comprising the following steps:

[0047] 1) Preparation of carbon spheres: Dissolve 3.5g of glucose in 60g of deionized water, then add 3g of methanol and stir evenly, add dropwise 1mol / L sodium hydroxide solution, adjust the pH to 8, stir evenly, put it into the reaction kettle, and After reacting at 200°C for 6 hours, take it out, and after natural cooling, take out the liner of the reactor, filter with suction and wash the filter cake with ethanol to obtain a carbon sphere template, and dry the carbon sphere template at 60°C for later use;

[0048] 2) Preparation of C@SiO 2 : Disperse 0.8g CTAB and 0.4g carbon spheres in a solution of 60mL ethanol and 60mL deionized water, and ultrasonically crush for 2 hours to obtain a suspension of carbon spheres. Add ammonia water dropwise to the suspension of carbon spheres under stirring to adjust the pH value...

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Abstract

The invention discloses a high-performance hollow silicon-carbon graphene ternary composite negative electrode material, and belongs to the technical field of lithium ion battery negative electrode materials. The high-performance hollow silicon-carbon graphene ternary composite negative electrode material comprises elemental silicon, elemental carbon and graphene; the elemental silicon is a hollowsilicon ball; the elemental silicon and the elemental carbon form carbon-coated hollow silicon; and the carbon-coated hollow silicon is adhered between graphene layers. According to nano hollow silicon provided by the invention, a hollow structure reserves a certain space for the volume expansion of silicon, so that the stress is directed to the center of the sphere when the volume expansion occurs, and nano-silicon particles are not easily broken, thereby retaining the integrity of the particles and the integrity of an electrode during the cyclic process, and forming a stable SEI (Solid Electrolyte Interphase).

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery anode materials, in particular to a high-performance hollow silicon-carbon-graphene ternary composite anode material prepared by using hollow silicon spheres as a raw material and a preparation method thereof. Background technique [0002] At present, rechargeable lithium-ion batteries are widely used in the fields of portable electronic products and electric vehicles, while commercial lithium-ion batteries mainly use graphite-like carbon materials as negative electrodes. The demand for high energy density and high power density in fields such as batteries and energy storage power stations; in addition, graphite has a peeling phenomenon in PC electrolyte solution, and LiC formed by intercalation of lithium 6 Vitality is strong, so that its safety performance is reduced. Therefore, it is of great research significance and application prospect to develop lithium-ion battery electrode ma...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 王明珊
Owner SOUTHWEST PETROLEUM UNIV
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