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SiOx/Si/c composite material and process of producing thereof, and anode for lithium ion battery comprising said composite material

A technology of lithium-ion batteries and composite materials, applied in the field of composite materials, to achieve the effect of maximizing the volume buffer effect

Active Publication Date: 2016-03-16
ROBERT BOSCH GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the aforementioned prior art discloses that due to disproportionation reactions during the preparation of SiO-based materials, SiO 2 It is inevitable

Method used

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  • SiOx/Si/c composite material and process of producing thereof, and anode for lithium ion battery comprising said composite material
  • SiOx/Si/c composite material and process of producing thereof, and anode for lithium ion battery comprising said composite material
  • SiOx/Si/c composite material and process of producing thereof, and anode for lithium ion battery comprising said composite material

Examples

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Embodiment 1

[0075] Preparation of SiO x / Si composite material

[0076] SiO was synthesized by a high energy ball milling process using PlanetaryMonoMillP-6 (Fritsch, Germany) at 400rpm for 25 hours x / Si composite material. 2.0 g of SiO (325 mesh, Aldrich) powder was charged into a 80 ml zirconia jar, and ball milled together with 10 zirconia balls (Φ=10 mm) for 10 hours. Then 0.218 g of Mg powder (200 mesh, purchased from Sinopharm Chemical Reagent Co., Ltd.) was added, and ball milling was continued for 15 hours. SiO having a D50 particle size of about 1.0 μm, a D90 particle size of about 11.0 μm, and a D10 particle size of about 0.4 μm was thus obtained. x / Si / C composite materials (such as Figure 4 shown). The resulting powder (SiO x / Si / MgO) were first impregnated with 2M HCl solution for 12 hours to remove MgO, then washed with deionized water, and finally dried under vacuum at 60 °C for 10 hours. The resulting SiO x The Si:O molar ratio of the Si / Si composite is abo...

Embodiment 2

[0080] Prepare SiO with the same method as used in Example 1 x / Si / C composites, with the difference that 2.0 g of SiO powder and 0.545 g of Mg powder were charged into the ball milling process. The resulting SiO x The Si:O molar ratio of the Si / Si composite is about 2:1.

Embodiment 3

[0082] SiO was prepared in the same manner as used in Example 1 x / Si / C composites, the difference is that 2.0 g of SiO powder and 0.872 g of Mg powder were charged into the ball milling process. The resulting SiO x The Si:O molar ratio of the Si / Si composite is about 5:1.

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Abstract

The invention provides a SiOx / Si / C composite material, comprising SiOx / Si composite particles and a carbon coating layer coated on said SiOx / Si composite particles, wherein said SiOx / Si composite particles comprises of nano-silicon crystallites embedded in a SiOx (0<x<=2) amorphous matrix phase, said SiOx / Si composite particles have a SiO molar ratio of 5:1-1.1:1, preferably 2:1-1.2:1. The invention also provides a process for producing a SiOx / Si / C composite material, which comprises the steps of a) milling SiO powder together with a metal reductant in a molar ratio of 1.25:1-10:1, preferably 2:1-5:1, b) totally removing the oxidation product of said metal reductant to obtain SiOx / Si composite particles, c) coating said SiOx / Si composite particles with carbon to obtain said SiOx / Si / C composite material.

Description

technical field [0001] The present invention relates to the preparation of SiO x / Si / C composite method. Specifically, the present invention relates to the preparation of SiO x / Si / C composite method. The invention also relates to the SiO produced by said method x / Si / C composites and their use in lithium-ion batteries. In addition, the present invention also relates to composite materials and their preparation of SiO x / Si / C composite materials. Background technique [0002] Lithium-ion batteries (LIBs) are widely used as power sources for ubiquitous mobile electronic devices, such as cell phones and notebook computers. Graphite is the most widely used negative electrode material for rechargeable lithium-ion batteries. However, the energy density of graphite is relatively low, that is, only 372mAhg -1 . In order to further increase the energy density of lithium-ion batteries, researchers have focused on silicon-based anode materials because of their high lithium st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/1397H01M10/0525
CPCC04B35/62615C04B35/62839C04B35/62884C04B35/62897C04B2235/3418C04B2235/401C04B2235/428C04B2235/5436C04B2235/5472H01M4/1391H01M4/1395H01M4/362H01M4/364H01M4/366H01M4/386H01M4/483H01M4/587H01M4/625H01M10/0525H01M2220/30Y02E60/10H01M4/0428H01M4/48H01M4/583
Inventor 杨军冯雪娇张敬君周龙捷窦玉倩
Owner ROBERT BOSCH GMBH
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