Abstract:
A method for removing plasticizers such as dibutyl phthalate from the anode, cathode, and polymeric matrix components of electrochemical cell precursors using carbon dioxide in the supercritical state is provided. The method forms porous polymeric structures that enhances the mass transport of ions in the cell which results in improved electrochemical performance.
Abstract:
A method for producing a Li(Al) anode for a lithium battery comprises the steps of pyrometallurgically alloying Li and Al in inert atmosphere, grinding the formed alloy after cooling to a homogeneous powder, pressing or extruding the powder to an elongated anode element (2) around a current conductive thread (1), preferably of nickel, and providing the anode element with an enclosure (3) of microporous separator material.
Abstract:
The present invention pertains to an electrode-forming composition comprising: (a) at least one fluoropolymer [polymer (F)]; (b) particles of at least one active electrode material [particles (P)], said particles (P) comprising: - a core comprising at least one active electrode compound [compound (NMC)] of formula (I): Li[Li x (A p B Q C w ) 1-x ]O 2 (I) wherein A, B and C, different from each other, are selected from the group consisting of Fe, Ni, Mn and Co, x is comprised between 0 and 0.3, P is comprised between 0.2 and 0.8, preferably between 0.2 and 0.5, more preferably between 0.2 and 0.4, Q is comprised between 0.1 and 0.4, and W is comprised between 0.1 and 0.4, and - an outer layer consisting of a metal compound [compound (M)] different from Lithium, said outer layer at least partially surrounding said core; and (c) a liquid medium [medium (L)]. The present invention also pertains to a process for manufacturing said electrode-forming composition, to the use of said electrode-forming composition in a process for manufacturing a positive electrode and to the positive electrode obtainable therefrom.
Abstract:
Lithium transition metal cathode materials are functionalized with a stable free radical such as a nitroxide free radical. The stable free radical may be bonded directly to the cathode material or to a coating, such as a polymeric coating, on the surface of particles of the lithium transition metal cathode material. The functionalized cathode materials perform very well as lithium battery cathodes.
Abstract:
An electrode for secondary batteries, the electrode includes a current collector foil, a first mixture layer, and a second mixture layer. The first mixture layer is a layer of granulated particles accumulated on the current collector foil. The granulated particles contain at least an active material and a binder. The second mixture layer is a layer of a mixture paste applied to a surface of the first mixture layer and then dried. The mixture paste is obtained by kneading at least an active material, a binder, and a solvent.
Abstract:
The invention pertains to a core-shell type anode active material for lithium secondary batteries, comprising: a core made of a silicon-containing electroactive material; and a metallic shell formed outside the core, wherein the metallic shell is composed of at least one metallic compound comprising at least one metal [compound (M)]. The invention further discloses a method for manufacturing said core-shell type anode active material, which uses electroless plating. Additionally, the invention also relates to a process for manufacturing an anode structure using the core-shell type anode active material, and to an electrochemical device comprising said anode structure.
Abstract:
Es wird ein Verfahren zur Herstellung einer Elektrode vorgeschlagen, wobei in einem ersten Verfahrensschritt eine Beschichtung derart auf ein Elektrodensubstrat aufgetragen wird, dass mindestens ein beschichteter Bereich und mindestens ein nichtbeschichteten Bereich gebildet wird, wobei in einem zweiten Verfahrensschritt zumindest ein Teil der Beschichtung vom beschichteten Bereich abgetragen wird.
Abstract:
A multilayer electrode suitable for use in a secondary battery is disclosed. The major active component of one layer is different to a major active component of an adjacent layer. The use of layered electrodes improves both the capacity retention and cycle life of batteries including such layered electrodes.