Carbon-coated active particles and processes for their preparation
AssigneesHydro-Quebec, Sony Corporation
InventorsJean-Christophe DAIGLE, Yuichiro ASAKAWA, Shinichi UESAKA, Karim ZAGHIB
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Abstract
A process for the preparation of carbon-coated particles, where the particles include an electrochemically active material. The process includes the steps of emulsion polymerization, drying and thermally treating the polymer to obtain a nano-layer of carbon on the particles, where the carbon layer includes fibers and nitrogen-containing polyaromatics have a graphene-like structure. Also, the particles produced by the method as well as to electrode materials, electrodes and electrochemical cells including the particles.
Claims28
A process for producing carbon-coated particles, the process comprising the steps of:
- a. forming an emulsion by mixing particles, acrylonitrile monomers, and an aqueous solvent, said particles comprising an electrochemically active material;
- b. polymerizing the acrylonitrile monomers in the mixture of step (a) by emulsion polymerization;
- c. drying the particles from step (b) to form a nano-layer of poly(acrylonitrile) at the surface of the particles;
- and
- d. thermally treating the dried particles of step (c) to form the carbon-coated particles, said carbon consisting in a nano-layer of carbon comprising fibers on the surface of the particles.
(canceled)
The process ofclaim 12, wherein the inert atmosphere is selected from argon, nitrogen, carbon dioxide or a mixture thereof.
A process for producing carbon-coated LTO particles, the process comprising the steps of:
- a. forming a Pickering emulsion comprising particles, acrylonitrile monomers, a polymerization initiator and an aqueous solvent, said particles comprising LTO as an electrochemically active material;
- b. polymerizing the acrylonitrile monomers by emulsion polymerization to form poly(acrylonitrile) on a surface and inside pores of the particles;
- c. spray drying the polymerized particles of step (b) to obtain dried particles having a nano-layer of poly(acrylonitrile) at their surface;
- and
- d. carbonizing the dried particles of step (c) to form a carbon coating comprising carbon fibers on the surface of the particles.
(canceled)
Carbon-coated particles, wherein the particles comprise an electrochemically active material and are coated with a nano-layer of carbon comprising carbon fibers and polyaromatics consisting of carbon and nitrogen atoms.
(canceled)
Dependencies are inferred from the claim text.