A silicon-based composite material, lithium-ion battery, preparation method and application thereof

A technology of silicon-based composite materials and intermediate materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unsatisfactory cycle performance and high production costs, and achieve the effects of low cost and low pollution
CN103165870BActive Publication Date: 2016-03-16SHANGHAI SHANSHAN TECH CO LTD +1
3 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI SHANSHAN TECH CO LTD
Publication Date
2016-03-16

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a preparation method of a silicon-based composite material, which is characterized in that: the reaction raw material is induced by peroxide in the presence of a sub-micron metal powder; polycarbosilane and / or polysiloxane is subjected to a crosslinking polymerization reaction to get the cross-linking and curing product; molecular weight of polycarbosilane or polysiloxane is 800-5000 g / mol; the polycarbosilane or the polysiloxane has at least one reactive H; the cross-linking and curing product is calcined at 600-1000 DEG C to get an intermediate material; the intermediate material, graphite and a binder are mixed, processed by wet ball milling, and dried in a spraying manner to obtain spherical particles; and the spherical particles are subjected to heat process at 400-800 DEG C. The present invention also provides a silicon-based composite material obtained by the method and application thereof, and a lithium ion battery taking the silicon-based composite material as a negative electrode material. The silicon-based composite material particles of the present invention are good in shape, and have good initial charge-discharge properties and electrical cycle performances. The preparation method of the present invention is suitable for industrialized production, low in environmental pollution and low in cost.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of lithium-ion batteries, in particular to a silicon-based composite material and its preparation method and application. The invention relates to a lithium-ion battery containing the silicon-based composite material. Background technique

[0002] At present, graphite raw materials are mostly used as lithium-ion battery anode materials in the market. The non-carbon-based anode materials studied mainly include: nitrides, silicon and silicides, tin-based oxides and tin compounds, new alloys, titanium oxides, etc. . Among them, silicon material has the advantage of large specific capacity as the anode material of lithium-ion batteries, and is one of the hotspots in the research of high-capacity lithium-ion anode materials. Although silicon has a maximum theoretical capacity of 4200mAh / g, its poor initial efficiency and cycle performance limit its commercial application. In order to meet the needs of high-capacity and h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More