Hollow silicon-based composite material, preparation method and lithium ion battery comprising composite material

A composite material, hollow silicon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cumbersome preparation methods, affecting practical applications, and unfavorable industrial production, reducing volume expansion, improving conductivity, and improving strength. Effect

Active Publication Date: 2016-11-16
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its first coulombic efficiency is very low, all below 70%, and its preparation method is cumbe

Method used

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  • Hollow silicon-based composite material, preparation method and lithium ion battery comprising composite material
  • Hollow silicon-based composite material, preparation method and lithium ion battery comprising composite material
  • Hollow silicon-based composite material, preparation method and lithium ion battery comprising composite material

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Example Embodiment

[0126] Example 1

[0127] (1) The SiO with a median particle size of 50nm 2 Particles, spherical graphite particles with a median diameter of 2μm, and polyacrylamide were added to the methanol solution in a mass ratio of 1:0.5:0.5, stirred for 30 minutes, and then the solvent was spray-dried to obtain a median particle size of 3μm. Forebody one;

[0128] (2) Put the precursor obtained in step (1) in a reaction furnace, blow in air, raise the temperature to 800°C, and hold for 3 hours, and perform oxidation heat treatment on the precursor to obtain a hollow cavity and a secondary particle silicon oxide layer Formed precursor two;

[0129] (3) Then the precursor 2 obtained in step (2) and the sodium powder are mixed in a VC mixer at a mass ratio of 1:0.55 to achieve homogeneous mixing, and the homogeneously mixed product is placed in a closed container, and then Put it into a high-temperature furnace, pass in Ar gas as a protective gas, and heat up to 700°C, and the non-oxidizing hea...

Example Embodiment

[0136] Example 2

[0137] (1) Set the median diameter to 80nm SiO 1.5 The particles, spherical graphite particles with a median diameter of 3μm and polypropylene were added to the ethanol solution in a mass ratio of 1:0.8:0.4, stirred for 30 minutes, and then the solvent was spray-dried to obtain a precursor with a median particle size of 4μm One;

[0138] (2) Place the precursor obtained in step (1) in a reaction furnace, blow in air, raise the temperature to 1000°C, and keep it for 1 hour. Perform oxidation heat treatment on the precursor to obtain a hollow cavity and secondary particle silicon oxide layer Formed precursor two;

[0139] (3) Then the precursor two and magnesium powder obtained in step (2) are fused in a fusion machine at a mass ratio of 1:0.45 to achieve homogeneous mixing, and the homogeneously mixed product is placed in a closed container. Then it is placed in a high temperature furnace, and Ar gas is introduced as a protective gas, and the temperature is increa...

Example Embodiment

[0142] Example 3

[0143] (1) Add Si particles with a median diameter of 5nm, spherical graphite particles with a median diameter of 0.5μm, and polyvinylpyrrolidone into the n-butanol solution in a mass ratio of 1:0.5:0.3, stir for 90 minutes, and then The solvent was spray dried to obtain precursor one with a median particle size of 1 μm;

[0144] (2) Place the precursor obtained in step (1) in a reaction furnace, blow in air, raise the temperature to 600°C, and hold for 2 hours. Perform oxidation heat treatment on the precursor to obtain a hollow cavity and a secondary particle silicon oxide layer Formed precursor two;

[0145] (3) Then the precursor 2 obtained in step (2) and the aluminum powder are mixed in a VC mixer at a mass ratio of 1:0.4 to achieve homogeneous mixing, and the homogeneously mixed product is placed in a closed container, and then Put it into a high-temperature furnace, pass in helium gas as a protective gas, and raise the temperature to 800°C. The non-oxidiz...

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Abstract

The invention relates to a hollow silicon-based composite material, a preparation method and a lithium ion battery. The hollow silicon-based composite material disclosed by the invention comprises hollow cavities, a carbon-silicon composite layer and a cladding carbon layer in sequence from inside to outside, wherein the carbon-silicon composite layer comprises a secondary particle silicon layer and a deposited carbon layer. The preparation method comprises the following steps: firstly bonding silicon oxide and/or silicon on the surface of graphite uniformly, then removing the graphite through oxidizing heat treatment to obtain a hollow structure, then obtaining nanometer silicon through reduction by using a reducing agent, obtaining hollow particles consisting of the hollow cavities and the secondary particle silicon layer, then carrying out in-situ cladding on the surface of the secondary particle silicon layer, and then finally carrying out cladding of the cladding carbon layer to obtain the hollow silicon-based composite material. The battery prepared by using the composite material as an anode material has high cycle performance and rate capability, the first-time reversible capacity is more than 1453.2 mAh/g, the first-time coulomb efficiency is more than 87.8%, and the hundred-time cycle capacity retention ratio is more than 95.2%.

Description

Technical field [0001] The invention belongs to the application field of lithium ion battery negative electrode materials, and relates to a composite material, a preparation method thereof and a lithium ion battery containing the composite material, and in particular to a hollow silicon-based composite negative electrode material, a preparation method thereof, and a composite material containing the composite material Lithium ion battery as negative electrode material. Background technique [0002] Lithium-ion batteries have been widely used in mobile terminals, digital products and portable mobile devices, electric vehicles and energy storage power stations due to their outstanding advantages such as high voltage, good cycle performance, small self-discharge, and no memory effect. However, with the rapid development of the new energy vehicle market, it is currently difficult for lithium-ion batteries to meet the long-term endurance requirements of new energy vehicles. Therefore,...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/38H01M4/36H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/1393H01M4/1395H01M4/366H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 何鹏岳敏任建国郭锷明
Owner BTR NEW MATERIAL GRP CO LTD
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