Composite material, method of production thereof, system produced therefrom and application of same

Patent metadata

Field	Value
Publication number	US-2015318553-A1
Application number	US-201314651731-A
Country	US
Kind code	A1
Filing date	Dec 11, 2013
Priority date	Dec 12, 2012
Publication date	Nov 5, 2015
Grant date	—

Abstract

A material composite includes a coating material having particles and a base material, wherein 1) the base material contains on its surface depressions which lead to a reduced thickness of the base material at the position of the depressions, 2) the depressions are deviations from a smooth plane surface of the base material, and 3) geometrical dimensions and/or shapes of the particles and the depressions are similar or match such that one or more particles fully or partially fit geometrically into the individual depressions or penetrate adheringly by a force and/or energy so firmly that the adhesion is at least partially based on mechanical forces between particles and base material.

First claim

1 - 19 . (canceled)

20 . A material composite comprising a coating material having particles and a base material, wherein 1) the base material contains on its surface depressions which lead to a reduced thickness of the base material at the position of the depressions, 2) the depressions are deviations from a smooth plane surface of the base material, and 3) geometrical dimensions and/or shapes of the particles and the depressions are similar or match such that one or more particles fully or partially fit geometrically into the individual depressions or penetrate adheringly by a force and/or energy so firmly that the adhesion is at least partially based on mechanical forces between particles and base material.

21 . The material composite as claimed in claim 20 , wherein the geometrical surfaces of the particles are shaped or dimensioned, or are geometrically similar or match such that the particles on their surface either fit one another or are adheringly connected by the effect of force and/or energy so firmly that the adhesion is at least partially based on mechanical forces between particles.

22 . The material composite as claimed in claim 20 , wherein the particles cannot be separated from the base material without a nonzero force or energy contribution which may have the magnitude of the force of gravity.

23 . The material composite as claimed in claim 20 , wherein the diameter of the most frequently occurring particles is less than the most frequent diameter of the depressions in the surface of the base material.

24 . The material composite as claimed in claim 20 , wherein the diameter of the most frequently occurring particles is at least 1% or at least 5% smaller than the most frequent diameter of the depressions in the surface of the base material.

25 . The material composite as claimed in claim 20 , wherein the diameter of the most frequently occurring particles is at least 10% or at least 30% or at least 50% smaller than the most frequent diameter of the depressions in the surface of the base material.

26 . The material composite as claimed in claim 20 , wherein the geometrical shapes of the particles of the particle electrode and of the depressions in the surface of the base material are the same.

27 . The material composite as claimed in claim 20 , wherein the geometrical shapes of the particles and the depressions in the surface of the base material are identical and/or polygonal and/or spherical and/or hemispherical and/or elliptical and/or semi-elliptical.

28 . The material composite as claimed in claim 20 , wherein the geometrical shapes of the particles and the depressions in the surface of the base material are identical and/or triangular to n-gonal, where n may be any natural number and mathematical dimensions between individual vertices in the depression of the surface of the base material may be either the same and/or different to one another and/or may be connected to one another by any mathematical function.

29 . The material composite as claimed in claim 20 , wherein the geometrical shapes and the mathematical dimensions of the particles and of the depressions in the surface of the base material are similar such that respectively at least 99.99% or at least 80% or at least 50% or at least 20% or at least 10% of the surface of the depressions of the base material is touched by the surface of the particles.

30 . The material composite as claimed in claim 20 , wherein the particles and the depressions in the surface of the base material form a clip structure, the clip structure being characterized in that the inner diameter in the near-surface region of at least one depression is smaller than in the region of the same depression remote from the surface.

31 . The material composite as claimed in claim 20 , wherein the base material is an electrically conductive electrical lead of an electrochemical or electrical cell and the coating material contains at least one active material.

32 . An electrochemical system, battery, fuel cell, electrolysis cell or double-layer capacitor containing a material composite as claimed in claim 20 .

33 . A method of producing a material composite which comprises a coating material containing particles and a base material comprising in chronological succession:
A) determining spatial dimensions and size distribution of the particles, B) adapting and/or adjusting optimal particle size and shape as claimed in claim 20 , C) structuring the surface of the base material such that the particles of the particle electrode geometrically fit into the depressions of the surface of the base material, D) cleaning the base material with a compatible cleaning agent and/or solvent and/or by a physical method, E) drying the base material in a vacuum or in a protective gas atmosphere or in air and/or at elevated temperature, F) preparing the coating material by mixing electrochemically active material, material containing carbon, and binder, to form a homogeneous mixture, G) coating the base material structured according to step c) with the coating material containing particles adapted according to steps a) and b), the base material being at the same temperature or at a higher temperature in comparison to the coating material, H) drying the coated base material, and I) spatially compressing the layer produced according to step G or H, which may be at any temperature.

34 . The method of claim 33 , wherein the base material is an electrically conductive electrical lead of an electrochemical or electrical cell and the coating material contains at least one active material.

35 . The method of claim 34 , wherein the base material is an electrical lead and the coating contains or exclusively consists of active material and/or is a mixture containing carbon, which optionally contains carbon black and/or graphite and which optionally contains a binder and/or any plastic and/or a solvent.

36 . The method of claim 34 , wherein the surface of the electrical lead is coated with an adhesion promoter directly before step G.

37 . The method of claim 32 , wherein a base material is used which is so soft, and the particles or the coating material are applied onto the base material at a pressure so high that the particles or the coating material penetrate fully or partially into the base material and adhere in the base material.

Assignees

• Varta Microbattery Gmbh

Inventors

• Brandt Birgit

Classifications

• H01M4/66 Primary

  Selection of materials · CPC title

• H01M4/043

  involving compressing or compaction · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/8896

  Pressing, rolling, calendering (membrane electrode assemblies H01M8/1004) · CPC title

• H01M4/0402

  Methods of deposition of the material · CPC title