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All-solid-state lithium secondary battery

a lithium secondary battery, all-solid-state technology, applied in the direction of electrochemical generators, cell components, cell component details, etc., can solve the problems of leaking hydrogen sulfide gas to the outside of the battery case, loss of adsorption capacity, and inability to prevent the leakage of hydrogen sulfide gas generated

Inactive Publication Date: 2011-06-02
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]The present invention attains an effect of providing a safe and highly-reliable all-solid-state lithium secondary battery using a sulfide-based solid electrolyte material which can restrain generation of hydrogen sulfide gas, in case a large amount of water is entered into a battery case by an accident such as submersion associated with a breakage of the container.

Problems solved by technology

However, with batteries using solid electrolyte materials (sulfide-based solid electrolyte materials) which have the above-mentioned sulfide as their main constituent, there is a risk of leaking hydrogen sulfide gas to the outside of their battery cases when water is entered into the battery cases and the gas is generated.
However, since the adsorbent such as zeolite, silica gel and activated carbon absorb the gas using the surface adsorption, their adsorptive capacity are lost when the surface is covered by a large amount of water or the like.
Therefore, there has been a problem of being incapable in preventing the leakage of hydrogen sulfide gas generated because their adsorptive capacity is lowered when a large amount of water is entered into a battery by an accident such as submersion caused by breakage of the container or being exposed to buckets of rain.Patent Document 1: Japanese Patent Application Laid-Open (JP-A) No. 2004-087152Patent Document 2: JP-A No. 2004-227818Patent Document 3: JP-A No. 2003-151558Patent Document 4: JP-A No. 2001-052733Patent Document 5: JP-A No. 11-219722Patent Document 6: JP-A No. 2001-155790

Method used

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Examples

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Effect test

example 1

Production of an All-Solid-State Lithium Secondary Battery

[0063]A cathode active material (LiCoO2) and a solid electrolyte material (LiGe0.25P0.75S4) were mixed by a mass ratio of 7:3 and a cathode mix was prepared. This cathode mix of 15 mg and the solid electrolyte material of 200 mg, and an indium foil of 60 mg (thickness 0.2 mm) as an anode were placed in a molding holder and pressed by 5 t / cm2 to produce an electrode pellet having a diameter of about 10 mm and a thickness of about 1.5 mm.

[0064]Next, an aqueous solution of cupric nitrate was dropped onto the end part of the inner side of an upper cover for a battery case of coin case type (made of SUS) and dried to precipitate cupric nitrate (metal salt) of about 0.5 g. Further, as the Example was supposed to create a submersion of the battery case at the time of case breakage, a hole of φ 1 mm was made to the upper cover of the coin case.

[0065]The above-mentioned electrode pellet was placed inside of the coin case and the coin ...

example 2

Production of an All-Solid-State Lithium Secondary Battery

[0066]A cathode active material (LiCoO2) and a solid electrolyte material (LiGe0.25P0.75S4) were mixed by a mass ratio of 7:3 and a cathode mix was prepared. This cathode mix of 15 mg and the solid electrolyte material of 200 mg, and an indium foil of 60 mg (thickness 0.2 mm) as an anode were placed in a molding holder and pressed by 5 t / cm2 to produce an electrode pellet having a diameter of about 10 mm and a thickness of about 1.5 mm.

[0067]Next, an aqueous solution of cupric nitrate was dropped onto an upper cover for a battery case of laminate case type (made of aluminum) provided with a current collector made of SUS and a part of the inside of a lower cover thereof where no current collector is provided, that is the part where no potential is applied, and dried to precipitate cupric nitrate (metal salt) of about 0.5 g. Further, as the Example was supposed to create a submersion of the battery case at the time of case brea...

example 3

[0069]A laminate cell was produced in the same manner as in the Example 2 except that a solid electrolyte material was changed to 70Li2S-30P2S5 (obtained by following to the method disclosed in JP-A No. 2005-228570, wherein Li2 and P2S5 were vitrified by a planetary ball mill with a mole ratio of Li2S:P2S5=70:30 and then by heat treated) and an amount of cupric nitrate precipitated was made to 1.0 g.

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PUM

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Abstract

A safe and highly-reliable all-solid-state lithium secondary battery using a sulfide-based solid electrolyte material which can restrain generation of hydrogen sulfide gas, in case a large amount of water is entered into a battery case by an accident such as submersion associated with a breakage of the container. An all-solid-state lithium secondary battery using a sulfide-based solid electrolyte material, wherein the battery has a metal salt M-X comprising a metal element “M” and an anionic part “X” in a battery case thereof, and further wherein a metal cation of the metal salt M-X generated by disassociation caused with water can react with a sulfide ion generated by a reaction between the sulfide-based solid electrolyte material and the water.

Description

TECHNICAL FIELD[0001]The present invention relates to a safe and highly-reliable all-solid-state lithium secondary battery using a sulfide-based solid electrolyte material which can restrain generation of hydrogen sulfide gas.BACKGROUND ART[0002]With the recent rapid spread of information-related devices and communication devices such as personal computers, video cameras and cellular phones, developments of good secondary batteries, such as lithium secondary batteries, as electric power supply for those devices have been gaining recognition. Further, apart from the technical fields of information-related devices and communication devices, developments of high output and high capacity lithium secondary batteries for electric vehicles and hybrid-power cars as low-emission vehicles have been progressed in other fields such as an automobile industry.[0003]However, since current lithium secondary batteries commercially-supplied use organic electrolyte solutions which have combustible org...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M10/052H01M10/0562
CPCH01M4/38H01M4/525H01M10/052Y02T10/7011H01M2300/0068Y02E60/122H01M10/0562Y02E60/10H01M10/36Y02T10/70
Inventor TSUCHIDA, YASUSHI
Owner TOYOTA JIDOSHA KK
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