New electrode-active material for electrochemical elements
A technology of electrochemical components and active materials, applied in the field of electrochemical components, can solve problems such as consumption of electrolytes and decrease in energy density of lithium-ion batteries
Active Publication Date: 2011-11-09
VARTA MICROBATTERY +1
View PDF5 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Because the specific surface area of the active material containing a large number of nanoparticles is very large, the formation of the SEI consumes a correspondingly large amount of electrolyte and lithium
As a result, the positive electrode again has to be oversized in principle, which leads to a considerable decrease in the energy density of the corresponding lithium-ion battery and at least partially cancels out the advantage of the high energy density of the negative electrode
Method used
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
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0042] (1) To manufacture a preferred embodiment of the active material of the present invention, cyclopentasilane is polymerized under an argon atmosphere (water content and oxygen content < 1 ppm) using photoinduction by means of UV light at a wavelength of 405 nm. Polymerization is continued until the obtained polysilane mixture has a gel-like consistency. The latter was mixed with graphite particles having an average particle size of 15 μm to obtain a paste, which was then heat-treated at a temperature of 823K. This heat treatment was continued until no further hydrogen evolution was observed. The material thus obtained was subsequently ground in a ball mill and adjusted to an average particle size of about 20 μm.
[0043] (2) In order to manufacture the preferred embodiment of the electrode of the present invention, 8% (by weight) of sodium carboxymethyl cellulose (Walocell ? CRT2000PPA12) is introduced into water and fully expanded. In addition, 87% of the active mat...
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 PUM
| Property | Measurement | Unit |
|---|---|---|
| particle size | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to a method for producing active material for the electrode of an electrochemical element, comprising the steps of (1) providing carbon particles, (2) applying a silicon precursor onto the surface of the carbon particle and (3) thermally breaking down the silicon precursor to form metal silicon. The invention furthermore relates to an electrochemical active material that can be produced according to a said method, to an electrode having said active material, and to an electrochemical element having at least one said electrode.
Description
technical field [0001] The invention relates to an active material for an electrode of an electrochemical element, a method for producing the active material, an electrode comprising such an active material and an electrochemical element comprising at least one such electrode. Background technique [0002] Rechargeable lithium batteries in which metallic lithium is used as negative electrode material are known to have a very high energy density. However, it is also known that a series of problems can arise during cycling (charging and discharging) of such batteries. For example, the unavoidable side reactions of metallic lithium with the electrolyte solution lead to the coverage of the lithium surface with decomposition products that may affect the lithium deposition and dissolution process. In extreme cases, dendrites may also form, which in some cases may damage the electrode separator. The structure and composition of the surface layer (which is often also referred to a...
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 Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/38H01M4/36H01M4/26
CPCH01M4/587H01M10/0525H01M4/58H01M4/1393H01M4/1395Y02E60/12Y02E60/10H01M4/38C01B33/021H01M10/05H01M4/583
Inventor S.科勒S.皮希勒B.富克斯比希勒F.尤利希C.武尔姆T.韦尔勒M.温特
Owner VARTA MICROBATTERY