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Electrode, manufacturing method thereof, storage battery, and electronic device / Semiconductor Energy Laboratory Co., Ltd.




Electrode, manufacturing method thereof, storage battery, and electronic device


As a positive electrode active material of a secondary battery, a lithium-manganese composite oxide containing lithium, manganese, and an element represented by M, and oxygen is used, and the lithium-manganese composite oxide is covered with reduced graphene oxide. An active material layer including the active material, graphene oxide, a conductive additive, and a binder is formed and soaked in alcohol, and then heat treatment is performed, whereby an electrode with reduced graphene oxide is fabricated.



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USPTO Applicaton #: #20170062819
Inventors: Tatsuya Ikenuma


The Patent Description & Claims data below is from USPTO Patent Application 20170062819, Electrode, manufacturing method thereof, storage battery, and electronic device.


BACKGROUND

- Top of Page


OF THE INVENTION

1. Field of the Invention

One embodiment of the present invention relates to a semiconductor device, a display device, a light-emitting device, an imaging device, a power storage device, a memory device, a driving method thereof, or a manufacturing method thereof. In particular, one embodiment of the present invention relates to a structure of a storage battery and a method for manufacturing the storage battery. In particular, one embodiment of the present invention relates to a positive electrode active material and a positive electrode active material layer of a lithium-ion storage battery.

2. Description of the Related Art

In recent years, portable electronic devices such as smartphones and tablets have spread rapidly. Furthermore, hybrid cars and electric cars have attracted attention with growing interest in the environment. Thus, the importance of storage batteries increases. Examples of storage batteries include a nickel-metal hydride battery, a lead-acid battery, and a lithium-ion storage battery. In particular, lithium-ion storage batteries have been actively developed because the capacity thereof can be increased and the size thereof can be reduced.

The basic structure of a storage battery includes a positive electrode, a negative electrode, and an electrolyte provided therebetween. Examples of an electrolyte-containing object include a solid electrolyte and an electrolytic solution. Typically, the positive electrode and the negative electrode each include a current collector and an active material layer provided over the current collector. In the case of a lithium-ion storage battery, a material capable of receiving and releasing lithium ions is used as active materials for a positive electrode and a negative electrode.

As examples of positive electrode active materials of a lithium-ion storage battery, phosphate compounds disclosed in Patent Document 1, such as lithium iron phosphate (LiFePO4), lithium manganese phosphate (LiMnPO4), lithium cobalt phosphate (LiCoPO4), and lithium nickel phosphate (LiNiPO4), each of which has an olivine structure and contains lithium (Li) and iron (Fe), manganese (Mn), cobalt (Co), or nickel (Ni), are known.

REFERENCE Patent Document

[Patent Document 1] Japanese Published Patent Application No. H11-25983

SUMMARY

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OF THE INVENTION

To improve the performance of a storage battery, a manufacturing method for an electrode with a sufficient capacity is required to be developed. Furthermore, development of storage batteries has room for improvement in charge and discharge characteristics, cycle performance, reliability, safety, cost, and the like.

An object of one embodiment of the present invention is to increase the capacity per volume and/or weight of a power storage device. Another object of one embodiment of the present invention is to increase the capacity per volume and/or weight of an electrode.

Another object of one embodiment of the present invention is to increase the capacity per volume and/or weight of a particle containing a positive electrode active material. Another object of one embodiment of the present invention is to increase the amount of lithium ions per volume and/or weight of a particle containing a positive electrode active material to achieve high energy density.

Another object of one embodiment of the present invention is to cause a battery reaction stably at a high potential in a positive electrode containing a positive electrode active material.

Another object of one embodiment of the present invention is to provide a power storage device in which a decrease in capacity in charge and discharge cycles is inhibited. Another object of one embodiment of the present invention is to provide a positive electrode active material that can be formed at low cost.

A positive electrode active material of a lithium-ion storage battery preferably has high ionic conductivity and high electrical conductivity. Thus, another object of one embodiment of the present invention is to provide a positive electrode active material having high ionic conductivity and/or high electrical conductivity.

Another object of one embodiment of the present invention is to provide a method for manufacturing an electrode of a power storage device. Another object of one embodiment of the present invention is to provide a method for forming a positive electrode active material of a secondary battery.

Another object of one embodiment of the present invention is to provide a novel substance, a novel positive electrode active material, or a novel positive electrode active material layer. Another object of one embodiment of the present invention is to provide a novel particle containing a positive electrode active material. Another object of one embodiment of the present invention is to provide a novel power storage device, a novel battery, or a novel lithium-ion storage battery.

Note that the descriptions of these objects do not disturb the existence of other objects. In one embodiment of the present invention, there is no need to achieve all the objects. Other objects can be derived from the descriptions of the specification, the drawings, the claims, and the like.

One embodiment of the present invention is a method for manufacturing an electrode. The method includes a step of forming an active material layer over a current collector and a step of performing heat treatment after the active material layer is impregnated with alcohol. The active material layer includes an active material particle covered with a film containing carbon, a conductive additive, graphene oxide, and a binder.

Another embodiment of the present invention is a method for manufacturing an electrode. The method includes a step of forming an active material layer over a current collector and a step of performing heat treatment after the active material layer is impregnated with alcohol. The active material layer includes an active material particle covered with a film containing carbon, a conductive additive, graphene oxide, and a binder. The film containing carbon includes reduced graphene oxide.

Another embodiment of the present invention is an electrode including a current collector and an active material layer over the current collector. The active material layer includes an active material particle, a conductive additive, first reduced graphene oxide, second reduced graphene oxide, and a binder. The first reduced graphene oxide is in contact with a first region of the active material particle. The second reduced graphene oxide is in contact with a second region of the active material particle and includes a region covering at least part of the first reduced graphene oxide.

In each of the above structures, the active material particle is preferably a lithium-manganese composite oxide represented by LiaMnbMcOd. In that case, the element M is preferably any one of chromium, cobalt, aluminum, nickel, iron, magnesium, molybdenum, zinc, indium, gallium, copper, titanium, niobium, silicon, and phosphorus.

In each of the above structures, the alcohol is any one of methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, and tert-butyl alcohol.

Another embodiment of the present invention is a storage battery including the above electrode and a negative electrode.

Another embodiment of the present invention is an electronic device including the above storage battery, and a display panel, an operation key, a speaker, or a microphone.

One embodiment of the present invention can increase the capacity per volume and/or weight of a power storage device. One embodiment of the present invention can increase the capacity per volume and/or weight of an electrode.

One embodiment of the present invention can increase the capacity per volume and/or weight of a particle containing a positive electrode active material. One embodiment of the present invention can increase the amount of lithium ions per volume and/or weight of a particle containing a positive electrode active material to achieve high energy density.

One embodiment of the present invention can cause a battery reaction stably at a high potential in a positive electrode containing a positive electrode active material.

One embodiment of the present invention can provide a power storage device in which a decrease in capacity in charge and discharge cycles is inhibited. One embodiment of the present invention can provide a positive electrode active material that can be formed at low cost.

One embodiment of the present invention can provide a positive electrode active material having high ionic conductivity and/or high electrical conductivity.

One embodiment of the present invention can provide a method for manufacturing an electrode of a power storage device. One embodiment of the present invention can provide a method for forming a positive electrode active material of a secondary battery.

One embodiment of the present invention can provide a novel substance, a novel positive electrode active material, or a novel positive electrode active material layer. One embodiment of the present invention can provide a novel particle containing a positive electrode active material. One embodiment of the present invention can provide a novel power storage device, a novel battery, or a novel lithium-ion storage battery.




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stats Patent Info
Application #
US 20170062819 A1
Publish Date
03/02/2017
Document #
15247175
File Date
08/25/2016
USPTO Class
Other USPTO Classes
International Class
/
Drawings
35


Electrode Electronic Device Graph Graphene Graphene Oxide Lithium Manganese

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Semiconductor Energy Laboratory Co., Ltd.


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20170302|20170062819|electrode, manufacturing method thereof, storage battery, and electronic device|As a positive electrode active material of a secondary battery, a lithium-manganese composite oxide containing lithium, manganese, and an element represented by M, and oxygen is used, and the lithium-manganese composite oxide is covered with reduced graphene oxide. An active material layer including the active material, graphene oxide, a conductive |Semiconductor-Energy-Laboratory-Co-Ltd
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