US2023378473A1PendingUtilityA1

Method of manufacturing electrode

88
Assignee: SEMICONDUCTOR ENERGY LABPriority: Jun 3, 2011Filed: Aug 8, 2023Published: Nov 23, 2023
Est. expiryJun 3, 2031(~4.8 yrs left)· nominal 20-yr term from priority
Inventors:Hiroatsu TodorikiJunpei MomoTeppei OguniNobuhiro Inoue
H01M 4/624H01M 4/0404H01M 4/131H01M 4/0471H01M 4/364H01M 4/505H01M 4/525H01M 4/5825H01M 4/587H01M 4/625H01M 4/627H01M 10/052H01M 4/1397H01M 4/362H01M 4/583H01M 10/0525H01M 4/1393Y02E60/10H01M 4/136H01M 4/661
88
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Claims

Abstract

Described herein is a positive electrode comprising an active material particle, an acetylene black particle and net-like graphene. The positive electrode can be used in a battery.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method of manufacturing a graphene net comprising a plurality of active material particles, comprising steps of:
 making a mixture of graphene oxide and a plurality of active material particles; and   reducing the graphene oxide by heating the mixture,   wherein the heating step is performed at a temperature higher than or equal to 170° C.   
     
     
         2 . The method of manufacturing the electrode according to  claim 1 ,
 further comprising a step of adding a conduction auxiliary agent comprising acetylene black, graphite particles, or carbon fibers to the mixture.   
     
     
         3 . The method of manufacturing the electrode according to  claim 1 ,
 wherein the plurality of active material particles comprises lithium-containing composite oxide.   
     
     
         4 . The method of manufacturing the electrode according to  claim 1 ,
 further comprising a step of adding a binder comprising a polymer organic compound to the mixture.   
     
     
         5 . The method of manufacturing the electrode according to  claim 1 ,
 wherein surfaces of the plurality of active material particles are coated with a conductive film comprising carbon.   
     
     
         6 . The method of manufacturing the electrode according to  claim 1 ,
 wherein a proportion of elements other than carbon and hydrogen in the graphene net is lower than or equal to 15 atomic %.   
     
     
         7 . The method of manufacturing the electrode according to  claim 1 ,
 wherein an average particle size of the plurality of active material particles is smaller than or equal to 150 nm.   
     
     
         8 . The method of manufacturing the electrode according to  claim 1 ,
 wherein an average particle size of the plurality of active material particles is greater than or equal to 20 nm and smaller than or equal to 100 nm.   
     
     
         9 . The method of manufacturing the electrode according to  claim 1 ,
 wherein the plurality of active material particles are particles of lithium cobaltate, lithium iron phosphate, or lithium manganese phosphate.   
     
     
         10 . The method of manufacturing the electrode according to  claim 1 ,
 wherein the heating step is performed under a vacuum or a reducing atmosphere.   
     
     
         11 . The method of manufacturing the electrode according to  claim 1 ,
 wherein the graphene net has a portion partially wrapped around the active material particles, and   wherein the graphene net includes an open portion exposing the active material particles.   
     
     
         12 . A method of manufacturing an electrode comprising a graphene net, comprising steps of:
 making a mixture of graphene oxide and a plurality of active material particles;   applying the obtained mixture on a current collector; and   reducing the graphene oxide by heating the mixture after the applying step.   
     
     
         13 . The method of manufacturing the electrode according to  claim 12 ,
 wherein the current collector comprises aluminum.   
     
     
         14 . The method of manufacturing the electrode according to  claim 12 ,
 further comprising a step of adding a conduction auxiliary agent comprising acetylene black, graphite particles, or carbon fibers to the mixture.   
     
     
         15 . The method of manufacturing the electrode according to  claim 12 ,
 further comprising a step of adding a binder comprising a polymer organic compound to the mixture.   
     
     
         16 . The method of manufacturing the electrode according to  claim 12 ,
 wherein surfaces of the plurality of active material particles are coated with a conductive film comprising carbon.   
     
     
         17 . The method of manufacturing the electrode according to  claim 12 , wherein a proportion of elements other than carbon and hydrogen in the graphene net is lower than or equal to 15 atomic %. 
     
     
         18 . The method of manufacturing the electrode according to  claim 12 ,
 wherein an average particle size of the plurality of active material particles is smaller than or equal to 150 nm.   
     
     
         19 . The method of manufacturing the electrode according to  claim 12 ,
 wherein an average particle size of the plurality of active material particles is greater than or equal to 20 nm and smaller than or equal to 100 nm.   
     
     
         20 . The method of manufacturing the electrode according to  claim 12 ,
 wherein the plurality of active material particles are particles of lithium cobaltate, lithium iron phosphate, or lithium manganese phosphate.   
     
     
         21 . The method of manufacturing the electrode according to  claim 12 ,
 wherein the reducing step is performed under a vacuum or a reducing atmosphere.   
     
     
         22 . The method of manufacturing the electrode according to  claim 12 ,
 wherein the graphene net has a portion partially wrapped around the active material particles, and   wherein the graphene net includes an open portion exposing the active material particles.   
     
     
         23 . A method of manufacturing an electrode comprising a graphene net, comprising steps of:
 making a mixture of graphene oxide and a plurality of active material particles;   applying the obtained mixture on a current collector; and   reducing the graphene oxide by heating the mixture at a temperature higher than or equal to 170° C. after the applying step,   wherein the plurality of active material particles are partly covered by the graphene net, and   wherein the plurality of active material particles comprises regions that are in direct contact with the current collector.   
     
     
         24 . The method of manufacturing an electrode according to  claim 23 ,
 wherein the slurry consists of the piece of graphene oxide, the particle of the active material, and a solvent by making the slurry.   
     
     
         25 . The method of manufacturing an electrode according to  claim 23 ,
 wherein the active material is a positive electrode material, and   wherein an average particle size of the particle of the active material is smaller than or equal to 150 nm.   
     
     
         26 . A method of manufacturing a power storage device, comprising steps of:
 manufacturing an electrode according to  claim 23 ; and   providing a negative electrode through a separator interposed therebetween.

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