US2020274165A1PendingUtilityA1

Method of manufacturing electrode

69
Assignee: SEMICONDUCTOR ENERGY LABPriority: Jun 3, 2011Filed: May 13, 2020Published: Aug 27, 2020
Est. expiryJun 3, 2031(~4.8 yrs left)· nominal 20-yr term from priority
Inventors:Hiroatsu TodorikiJunpei MomoTeppei OguniNobuhiro Inoue
Y02E60/10H01M 4/5825H01M 4/625H01M 10/052H01M 4/661H01M 4/364H01M 4/1397H01M 4/0471H01M 4/0404H01M 4/136H01M 4/525H01M 4/505H01M 4/587H01M 4/627H01M 4/362H01M 4/131H01M 4/624H01M 4/1393H01M 10/0525H01M 4/583
69
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Claims

Abstract

To increase the conductivity and electric capacity of an electrode which includes active material particles and the like and is used in a battery, a graphene net including 1 to 100 graphene sheets is used instead of a conventionally used conduction auxiliary agent and binder. The graphene net which has a two-dimensional expansion and a three-dimensional structure is more likely to touch active material particles or another conduction auxiliary agent, thereby increasing the conductivity and the bonding strength between active material particles. This graphene net is obtained by mixing graphene oxide and active material particles and then heating the mixture in a vacuum or a reducing atmosphere.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A secondary battery, comprising:
 a current collector; and   an active material layer disposed on the current collector, the active material layer comprising:   a plurality of active material particles, each of the plurality of active material particles having the same active material composition, and a portion of the plurality of active material particles being in direct contact with the current collector; and   graphene sheets, one or more of the graphene sheets being in contact with at least one of the plurality of active material particles.   
     
     
         2 . The secondary battery according to  claim 1 , wherein the graphene sheets comprise at least two graphene sheets that are bonded together at one or more bonding regions. 
     
     
         3 . The secondary battery according to  claim 2 , wherein one or both of the at least two graphene sheets which are bonded together at one or more bonding regions is further in contact with at least one of the plurality of active material particles. 
     
     
         4 . The secondary battery according to  claim 1 , wherein the graphene sheets comprise at least one graphene sheet that is in direct contact with the current collector and in direct contact with at least one active material particle of the plurality of active material particles. 
     
     
         5 . The secondary battery according to  claim 1 , wherein the graphene sheets are present in the active material layer in an amount of about 2.5 wt % based on the total weight of the active material layer. 
     
     
         6 . The secondary battery according to  claim 1 , wherein the active material composition is LiMPO 4 , wherein M is one or more of Mn(II), Co(II), Ni(II), and Fe(II). 
     
     
         7 . The secondary battery according to  claim 6 , wherein M is Mn(II), Co(II), and Ni(II) or M is Fe(II). 
     
     
         8 . The secondary battery according to  claim 1 , wherein the active material layer further comprises a conduction auxiliary agent admixed with the plurality of active material particles. 
     
     
         9 . The secondary battery according to  claim 1 , wherein:
 the graphene sheets each have a first surface and a second surface opposite to the first surface,   the first surface of the one or more of the graphene sheets is in contact with the at least one of the plurality of active material particles, and   the second surface of the one of more of the graphene sheets is in contact with at least another one of the plurality of active material particles.   
     
     
         10 . A secondary battery, comprising:
 a current collector; and   an active material layer disposed on the current collector, the active material layer comprising:   a plurality of active material particles, each of the plurality of active material particles having the same active material composition, and a portion of the plurality of active material particles being in direct contact with the current collector; and   graphene sheets extending through the active material layer and being in contact with at least a portion of the plurality of active material particles thereby defining a graphene net.   
     
     
         11 . The secondary battery according to  claim 10 , wherein the graphene net defines a three-dimensional electrically conductive network through the active material layer. 
     
     
         12 . The secondary battery according to  claim 10 , wherein the graphene net binds the plurality of active material particles to the current collector. 
     
     
         13 . The secondary battery according to  claim 10 , wherein the graphene net comprises one or more bonded regions, the bonding regions being portions of graphene sheets bonded together. 
     
     
         14 . The secondary battery according to  claim 10 , wherein a portion of the graphene net is in direct contact with the current collector. 
     
     
         15 . The secondary battery according to  claim 10 , wherein:
 the graphene sheets each have a first surface and a second surface opposite to the first surface,   the first surface of the one or more of the graphene sheets is in contact with the at least one of the plurality of active material particles, and   the second surface of the one of more of the graphene sheets is in contact with at least another one of the plurality of active material particles.   
     
     
         16 . The secondary battery according to  claim 10 , wherein the active material composition is LiMPO 4 , wherein M is one or more of Mn(II), Co(II), Ni(II), and Fe(II). 
     
     
         17 . The secondary battery according to  claim 16 , wherein M is Mn(II), Co(II), and Ni(II) or M is Fe(II). 
     
     
         18 . The secondary battery according to  claim 10 , wherein the graphene net is present in the active material layer in an amount of about 2.5 wt % based on the total weight of the active material layer. 
     
     
         19 . The secondary battery according to  claim 10 , wherein the active material layer further comprises a conduction auxiliary agent admixed with the plurality of active material particles. 
     
     
         20 . A secondary battery, comprising:
 a current collector; and   an active material layer comprising a graphene net and a plurality of active material particles, wherein:   the graphene net comprises one or more graphene sheets,   each of the plurality of active material particles has the same active material composition,   at least a portion of the plurality of active material particles is in contact with the graphene net,   the graphene net comprises one or more open portions through which one or more of the plurality of active material particles are exposed, and   at least a portion of the one or more exposed active material particles is in direct contact with the current collector.   
     
     
         21 . The secondary battery according to  claim 20 , wherein the graphene net defines a three-dimensional electrically conductive network through the active material layer. 
     
     
         22 . The secondary battery according to  claim 20 , wherein the graphene net binds the plurality of active material particles to the current collector. 
     
     
         23 . The secondary battery according to  claim 20 , wherein the graphene net comprises two or more graphene sheets and one or more bonded regions, the bonding regions being portions of the two or more graphene sheets bonded together. 
     
     
         24 . The secondary battery according to  claim 20 , wherein the graphene net is in direct contact with the current collector. 
     
     
         25 . The secondary battery according to  claim 20 , wherein the active material composition is LiMPO 4 , wherein M is one or more of Mn(II), Co(II), Ni(II), and Fe(II). 
     
     
         26 . The secondary battery according to  claim 25 , wherein M is Mn(II), Co(II), and Ni(II) or M is Fe(II). 
     
     
         27 . The secondary battery according to  claim 20 , wherein the graphene net is present in the active material layer in an amount of about 2.5 wt % based on the total weight of the active material layer. 
     
     
         28 . The secondary battery according to  claim 20 , wherein the active material layer further comprises a conduction auxiliary agent admixed with the plurality of active material particles.

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