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Silicon nanometer layer graphite composite heterojunction material and preparation method and application thereof

A composite heterojunction and silicon nanotechnology, which is applied in the field of lithium-ion batteries, can solve the problems of affecting material consistency cycle stability, affecting electrode cycle stability, and limiting wide application, achieving high energy density, alleviating expansion, and improving energy efficiency. The effect of transfer rate

Active Publication Date: 2018-08-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the negative electrode composed of pure silicon powder is accompanied by a very large volume change during the process of deintercalating lithium, which causes the negative electrode material to fall off from the negative electrode current collector, resulting in irreversible capacity loss and reduced safety performance; at the same time, it is easy to agglomerate, affecting the cycle of the electrode stability, which limits its wide application
[0004] Lithium supplementation technology is a new type of material modification technology developed in recent years. It mainly coats a layer of lithium element or compound on the pole piece or surface to improve the initial efficiency of the material and the transmission rate of lithium ions. There is poor bonding force between the coating lithium compound and the core silicon material, resulting in poor coating effect, affecting the consistency of the material and its cycle stability

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  • Silicon nanometer layer graphite composite heterojunction material and preparation method and application thereof
  • Silicon nanometer layer graphite composite heterojunction material and preparation method and application thereof

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Embodiment 1

[0032] A silicon nano-layer graphite composite heterojunction material is characterized in that it includes an inner core and an outer layer, the inner core is graphite, and the outer layer is a silicon nano-layer;

[0033] Wherein, the average thickness of the silicon nanolayer is 100 nm; the graphite is artificial graphite; the diameter of the graphite is 1.5 μm; the mass ratio of the silicon nanolayer to graphite is 1:10.

[0034] The preparation method of the silicon nanolayer graphite composite heterojunction material comprises the following steps:

[0035] S1, mix 9g of graphite and 1g of nickel chloride solution evenly, adjust the pH to 4, then heat under reflux, and centrifuge to obtain sample a in which nickel is adsorbed on the surface of graphite;

[0036] S2. Pass hydrogen gas into sample a, heat at 1300° C. for 5 h, carry out hydrogenation reaction, form edge activation sites on the graphite layer, and obtain sample b;

[0037] S3. At a temperature of 1000°C, pas...

Embodiment 2

[0039] A silicon nano-layer graphite composite heterojunction material is characterized in that it includes an inner core and an outer layer, the inner core is graphite, and the outer layer is a silicon nano-layer;

[0040] Wherein, the average thickness of the silicon nanolayer is 10 nm; the graphite is artificial graphite; the diameter of the graphite is 4.5 μm; the mass ratio of the silicon nanolayer to graphite is 1:1.

[0041] The preparation method of the silicon nanolayer graphite composite heterojunction material comprises the following steps:

[0042] S1, mix 9g of graphite and 1g of nickel chloride solution evenly, adjust the pH to 4, then heat under reflux, and centrifuge to obtain sample a in which nickel is adsorbed on the surface of graphite;

[0043] S2. Pass hydrogen gas into sample a, heat at 800° C. for 3 hours, carry out hydrogenation reaction, form edge activation sites on the graphite layer, and obtain sample b;

[0044] S3. At a temperature of 800°C, pas...

Embodiment 3

[0046] A silicon nano-layer graphite composite heterojunction material is characterized in that it includes an inner core and an outer layer, the inner core is graphite, and the outer layer is a silicon nano-layer;

[0047] Wherein, the average thickness of the silicon nanolayer is 80nm; the graphite is natural graphite; the diameter of the graphite is 2.5 μm; the mass ratio of the silicon nanolayer to graphite is 1:7.

[0048] The preparation method of the silicon nanolayer graphite composite heterojunction material comprises the following steps:

[0049] S1, mix 8.5g of graphite and 1.5g of nickel nitrate solution evenly, adjust the pH to 4, then heat under reflux, and centrifuge to obtain sample a in which nickel is adsorbed on the graphite surface;

[0050] S2. Introduce hydrogen into sample a, heat at 1300° C. for 3 hours, carry out hydrogenation reaction, and form edge activation sites on the graphite layer, that is, obtain sample b;

[0051] S3. At a temperature of 100...

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Abstract

The invention discloses a silicon nanometer layer graphite composite heterojunction material. The silicon nanometer layer graphite composite heterojunction material comprises an inner core and a shelllayer, wherein the inner core is graphite, and the outer layer is a silicon nanometer layer. The invention also discloses preparation method and application of the silicon nanometer layer graphite composite heterojunction material. By the negative electrode material, the lithium ion transmission rate is effectively improved, the gram capacity of the negative electrode material is improved, rapidcharging and discharging are achieved very well, the negative electrode material has high energy density, and the actual application of the lithium ion battery negative electrode material is facilitated; and the test proves that the electrical property of the battery can be improved, and relatively good dynamic behavior is displayed.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a silicon nano-layer graphite composite heterojunction material and a preparation method and application thereof. Background technique [0002] At present, the anode materials of commercial lithium-ion batteries mainly use carbonaceous materials such as natural graphite and artificial graphite. The requirement of high-energy cathode materials such as manganese spinel high-voltage materials greatly limits the further improvement of the overall battery capacity. In order to meet the needs of high-capacity lithium-ion batteries, research and development of high-capacity anode materials has become very urgent and necessary. [0003] Among non-carbon anode materials, silicon-based materials have a high theoretical specific capacity of 4200mAh / g, are rich in resources and low in cost, making them one of the most promising anode materials for lithium-ion batteries. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/38H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 朱丽丽廖云龙郭桂略
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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