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Non-aqueous lithium storage element

A technology of electric storage element and non-aqueous electrolyte, applied in the direction of lithium storage battery, electrical element, non-aqueous electrolyte storage battery, etc., can solve the problems of lowering energy density, rising resistance, not considering suppression and other problems

Active Publication Date: 2020-04-14
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] However, these methods have the following problems: the addition of a lithium compound leads to the suppression of electron conduction between active material particles, resulting in an increase in resistance and a decrease in energy density, so there is room for further improvement in terms of higher output and higher energy density
However, the electrode of Patent Document 5 does not consider at all the suppression of the resistance increase under high-load charge-discharge cycles in the positive electrode containing the lithium compound, and the suppression of gas generation caused by the decomposition of the lithium compound at high voltage.

Method used

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preparation example Construction

[0270] The preparation of the coating solution for the positive electrode precursor is not particularly limited, and dispersers such as homogeneous dispersers, polyaxial dispersers, planetary mixers, and thin-film cyclone high-speed mixers can be suitably used. In order to obtain a coating liquid in a good dispersion state, it is preferable to perform dispersion at a peripheral speed of 1 m / s or more and 50 m / s or less. When the peripheral speed is 1 m / s or more, various materials can be dissolved or dispersed well, which is preferable. In addition, when the peripheral speed is 50 m / s or less, various materials will not be destroyed by heat or shear force generated by dispersion, and re-aggregation will not occur, which is preferable.

[0271] Regarding the degree of dispersion of the coating liquid, the particle size measured with a particle size meter is preferably 0.1 μm or more and 100 μm or less. As the upper limit of the degree of dispersion, the particle size is more pref...

Embodiment 1

[0553]

preparation example 1a

[0555] The crushed coconut shell carbides were carbonized in a small carbonization furnace at 500° C. for 3 hours in nitrogen to obtain carbides. The obtained carbide was charged into an activation furnace, and 1 kg / h of water vapor was introduced into the activation furnace in a state heated by a preheating furnace, and the temperature was raised to 900° C. for activation in 8 hours. Take out the activated carbide and cool it under a nitrogen atmosphere to obtain activated activated carbon. The activated carbon thus obtained was washed with water for 12 hours, and then water was removed. After that, it was dried in an electric dryer maintained at 125°C for 10 hours, and then pulverized by a ball mill for 1 hour to obtain activated carbon 1a.

[0556] The average particle diameter of this activated carbon 1a was measured using a laser diffraction particle size distribution analyzer (SALD-2000J) manufactured by Shimadzu Corporation, and it was 12.7 μm. In addition, the pore dist...

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Abstract

A non-aqueous lithium storage element, which uses a non-porous positive electrode current collector and a non-porous negative electrode current collector, the non-aqueous lithium electrical storage element does not reduce the electron conductivity in the positive electrode containing a lithium compound, It has high output and high energy density, and has excellent high-load charge-discharge cycle characteristics. It can adjust the potential change of the positive electrode active material layer coated on both sides of the non-porous positive electrode collector, and suppress the positive electrode under high temperature and high voltage. The gas generated during the excessive decomposition of the remaining lithium compound, the non-aqueous lithium storage element can alleviate the ion unevenness in the electrolyte solution during the high-load charge-discharge cycle, suppress the increase in resistance, and can suppress the lithium in the positive electrode at high voltage. Decomposition of compounds and suppression of gas generation, when the average particle size of the lithium compound in the storage device is X 1 , satisfy 0.1μm≤X 1 ≤10.0μm, when the average particle size of the positive electrode active material is set as Y 1 , satisfy 2.0μm≤Y 1 ≤20.0μm, X 1 <Y 1 .

Description

Technical field [0001] The present invention relates to a non-aqueous lithium storage element. Background technique [0002] In recent years, in order to protect the global environment and save resources and effectively use energy, wind power generation power stabilization system or late-night power storage system, household distributed power storage system based on solar power generation technology, and electric vehicle use The power storage system has attracted attention. [0003] The first requirement of batteries used in these power storage systems is high energy density. As a powerful supplement to high energy density batteries that can meet such requirements, the development of lithium ion batteries is actively promoted. [0004] The second requirement is high output characteristics. For example, in a combination of a high-efficiency engine and a power storage system (such as a hybrid electric vehicle), or a combination of a fuel cell and a power storage system (such as a fu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/06H01G11/24H01G11/26H01G11/50H01G11/70H01M4/1393H01M10/052H01M10/0567H01M10/0585
CPCH01G11/06H01G11/24H01G11/26H01G11/50H01G11/70H01M4/1393H01M10/0525H01M10/0566H01M10/058H01M10/052H01M10/0567H01M10/0585H01G11/34Y02T10/70Y02P70/50H01M4/133H01M4/62H01M10/446Y02E60/13H01G11/84H01G11/78H01M4/364
Inventor 梅津和照冈田宣宏上城武司
Owner ASAHI KASEI KK