Silicon-silicon oxide-carbon composite material, lithium ion secondary battery anode material, preparation methods of two and application of composite material

A carbon composite material, silicon oxide technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of small charge and discharge capacity, low initial efficiency, low cycle capacity retention rate, etc. The effect of efficiency

Active Publication Date: 2014-07-09
宁波杉杉硅基材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects of the existing silicon-carbon composite materials with silicon oxide as the silicon source, small charge and discharge capacity, low first-time efficiency or low retention rate of long-term use cycle capacity, which cannot be applied. , and provide a silicon-silicon oxide-carbon composite material, a negative electrode material for a lithium ion secondary battery, a preparation method and application thereof, which are superior to current silicon-carbon composite materials based on silicon oxide as a silicon source.

Method used

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  • Silicon-silicon oxide-carbon composite material, lithium ion secondary battery anode material, preparation methods of two and application of composite material
  • Silicon-silicon oxide-carbon composite material, lithium ion secondary battery anode material, preparation methods of two and application of composite material
  • Silicon-silicon oxide-carbon composite material, lithium ion secondary battery anode material, preparation methods of two and application of composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0069] Step 1: Put 200g of SiO powder with a particle size of D50=100nm (the SiO powder produced by Shanghai Shanshan New Materials Research Institute is SS-SiO-3d, commercially available) 200g in the rotary furnace, the inner diameter of the rotary furnace is 8cm, length 0.5m. Argon is used as the protective gas, and the flow rate of argon is 0.01NL / M to prevent the oxidation of SiO powder. Raise to 700°C at a rate of 2°C / min. When the temperature rises to 700°C, acetylene is introduced. At this time, the flow ratio of acetylene to argon is 1:3. After 2 hours of heat preservation, the reactor cools down to room temperature naturally. The resistivity value measured by the four-probe method is 3.132mΩ.mm.

[0070] The characterization method of this structure, first cut the primary particle with FIB, and observe its cross-section through TEM, the results are as follows figure 1 As shown, 1 represents elemental silicon particles; 2 represents the selected electron diffraction...

Embodiment 2

[0080] step 1:

[0081]Put 200 g of SiO powder with a particle size of D50 = 1 μm (the SiO powder of Shanghai Shanshan Advanced Materials Research Institute is SS-SiO-3e, commercially available) in a rotary furnace with an inner diameter of 8 cm and a length of 0.5 m. Argon is used as the protective gas, and the flow rate of argon is 0.01NL / M to prevent the oxidation of SiO powder. Raise to 700°C at a rate of 2°C / min. When the temperature rises to 700°C, acetylene is introduced. At this time, the flow ratio of acetylene to argon is 1:3. After 2 hours of heat preservation, the reactor cools down to room temperature naturally. The resistivity value measured by the four-probe method is 10.856mΩ.mm. The cross-section of the sample was observed with an electron microscope, and the thickness of the first amorphous carbon layer was measured to be 10 nm.

[0082] The operation steps of step 2 and step 3 are the same as the operation steps of step 2 and step 3 in embodiment 1. Th...

Embodiment 3

[0086] The preparation method is the same as that of Example 1. For the physical properties of the silicon-silicon oxide-carbon composite material, refer to Example 1.

[0087] Application of silicon-silicon oxide-carbon composite materials as anode materials:

[0088] In order to obtain a silicon-based negative electrode material that can be used commercially, on the basis of the silicon-silicon oxide-carbon composite material prepared in Example 3, it was mixed with mesocarbon powder (the model of Shanghai Shanshan Technology Co., Ltd. is MCP) Mesophase carbon powder, commercially available) was fully mixed at a mass ratio of 1:9 for 2 hours. The mixer is a double-helix cantilever cone mixer. The mixed sample is passed through a 150-mesh standard sieve for power supply performance testing.

[0089] The electrochemical performance test method is the same as that of Example 1, and the test results are shown in Table 1.

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Abstract

The invention provides a silicon-silicon oxide-carbon composite material, a lithium ion secondary battery anode material, preparation methods of the two materials and application of the composite material. The provided silicon-silicon oxide-carbon composite material successively comprises hard carbon particles and a second amorphous carbon layer along the ball diameter direction; the hard carbon particle inside comprises first particles each coated with a first amorphous carbon layer in a dispersion manner; and the first particle is silicon oxide particle and inside comprises simple-substance silicon particles in a dispersion manner. The silicon-silicon oxide-carbon composite material is applied to prepare the lithium ion secondary battery anode material. The lithium ion secondary battery anode material disclosed by the invention is large in charge / discharge capacity, high in first efficiency and long in capacity conservation rate after being recycled for a long time, and has wide market application prospect.

Description

technical field [0001] The invention relates to a silicon-silicon oxide-carbon composite material, a lithium ion secondary battery negative electrode material, a preparation method and application thereof. Background technique [0002] Commercial lithium-ion secondary battery negative electrode materials are mostly natural graphite, artificial graphite, and various graphite materials in the middle. Lithium secondary battery chemical power sources prepared with these materials are widely used in portable electronic devices, energy storage devices and electric vehicles. . The theoretical capacity of graphite is 372mAh / g, and the actual delithiation capacity of graphite-based negative electrode materials in half-cells is as high as 365mAh / g, but it is difficult to further improve. Taking the 18650 battery as an example, graphite anodes can no longer meet the energy density requirements of batteries above 3.0Ah. This market change requires the development of a new type of anode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583H01M4/48
CPCH01M4/366H01M4/386H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 沈龙董爱想娄文君乔永民黄亮刘广豹
Owner 宁波杉杉硅基材料有限公司
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