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Solid electrolyte composition, solid-electrolyte-containing sheet, all-solid-state secondary battery electrode sheet, all-solid-state secondary battery, production method for solid-electrode-containing sheet, and production method for all-solid-state secondary battery

A technology of solid electrolyte and composition, applied in the direction of non-aqueous electrolyte battery electrodes, solid electrolytes, secondary batteries, etc., can solve the problems of resistance increase, binder does not have ion conductivity, difficult to obtain secondary batteries, etc., to achieve The effect of less defect and excellent ion conductivity

Active Publication Date: 2020-05-26
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, binders are generally not ionically conductive
Therefore, when a binder is added, the resistance increases, making it difficult to obtain a secondary battery exhibiting desired conductivity.

Method used

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  • Solid electrolyte composition, solid-electrolyte-containing sheet, all-solid-state secondary battery electrode sheet, all-solid-state secondary battery, production method for solid-electrode-containing sheet, and production method for all-solid-state secondary battery
  • Solid electrolyte composition, solid-electrolyte-containing sheet, all-solid-state secondary battery electrode sheet, all-solid-state secondary battery, production method for solid-electrode-containing sheet, and production method for all-solid-state secondary battery
  • Solid electrolyte composition, solid-electrolyte-containing sheet, all-solid-state secondary battery electrode sheet, all-solid-state secondary battery, production method for solid-electrode-containing sheet, and production method for all-solid-state secondary battery

Examples

Experimental program
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Embodiment

[0313] The present invention will be described in further detail based on examples, but the present invention is not limitedly interpreted as these modes.

[0314] [Synthesis of Li-P-S Glass with Sulfide-based Inorganic Solid Electrolyte]

[0315] As a sulfide-based inorganic solid electrolyte, refer to T. Ohtomo, A. Hayashi, M. Tatsumisago, Y. Tsuchida, S. HamGa, K. Kawamoto, Journal of Power Sources, 233, (2013),

[0316] pp231-235 and A. Hayashi, S. Hama, H. Morimoto, M. Tatsumisago, T. Minami, Chem. Lett., (2001), pp872-873 (both non-patent documents), synthesized Li-PS glass.

[0317] Specifically, weigh 2.42g of lithium sulfide (Li) in a glove box under an argon atmosphere (dew point -70°C). 2 S, Aldrich. Inc, purity> 99.98%) and 3.90g phosphorus pentasulfide (P 2 S 5 , Aldrich. Inc., purity>99%), and put it into an agate mortar, and mix it with an agate milk stick for 5 minutes. Li 2 S and P 2 S 5 The mixing ratio is set to Li in molar ratio 2 S:P 2 S 5 =75:25.

[0318] In a 45...

preparation example 1

[0367] [Preparation Example 1] Preparation of solid electrolyte composition

[0368] Put 180 zirconia beads with a diameter of 5mm into a 45mL container made of zirconia (manufactured by Fritsch Co., Ltd), and put in the inorganic solid electrolyte shown in the table below, and the binder (B) prepared above After liquid and heptane as a dispersion medium, the container was set in a planetary ball mill P-7 (trade name) manufactured by Fritsch Co., Ltd, and mixed at room temperature at 300 rpm for 2 hours, thereby preparing a solid electrolyte composition .

[0369] In addition, when the solid electrolyte composition contains a conductive auxiliary agent, the above-mentioned inorganic solid electrolyte, the liquid containing the binder (B) prepared above, the conductive auxiliary agent, and the dispersion medium are mixed together using a ball mill P-7. Alkane, a solid electrolyte composition was prepared.

[0370] In addition, when the solid electrolyte composition contained an acti...

preparation example 2

[0371] [Preparation Example 2] Preparation of solid electrolyte-containing sheet

[0372] Each solid electrolyte composition prepared above was coated on a stainless steel (SUS) foil having a thickness of 20 μm as a current collector using a bar coater. Set the SUS foil as the lower surface on the hot plate, heat at 80°C for 1 hour to volatilize the dispersion medium and remove it (by this removal, part of the dispersion medium also remains as a residual solvent), and then pressurize at 300 MPa Press to produce a solid electrolyte-containing sheet.

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Abstract

Provided are: a solid electrolyte composition that makes it possible to form a layer that does not easily become internally flawed, even when bent to a small bend radius, and that also has excellent ion conductivity, even after being bent to a small bend radius; a solid-electrolyte-containing sheet, an all-solid-state secondary battery electrode sheet, and an all-solid-state secondary battery thatuse the solid electrolyte composition; and production methods for the solid-electrolyte-containing sheet, the all-solid-state secondary battery electrode sheet, and the all-solid-state secondary battery. A solid electrolyte composition that includes an inorganic solid electrolyte (A) that can conduct ions of a metal that belongs to group one or group two on the periodic table, a binder (B), and adispersion medium (C). The binder (B) includes: a first binder (B1) that settles when centrifuged in the dispersion medium (C) under specific conditions; and a second binder (B2) that does not settle. The first binder (B1) content X and the second binder (B2) content Y satisfy 0.10<=Y / (X+Y)<=0.80. A solid-electrolyte-containing sheet, an all-solid-state secondary battery electrode sheet, and an all-solid-state secondary battery that use the solid electrolyte composition and production methods for the solid-electrolyte-containing sheet, the all-solid-state secondary battery electrode sheet, and the all-solid-state secondary battery are also provided.

Description

Technical field [0001] The invention relates to a solid electrolyte composition, a solid electrolyte-containing sheet, an electrode sheet for an all-solid secondary battery, an all-solid secondary battery, and a solid electrolyte-containing sheet and a method for manufacturing the all-solid secondary battery. Background technique [0002] A lithium ion secondary battery is a storage battery that has a negative electrode, a positive electrode, and an electrolyte sandwiched between the negative electrode and the positive electrode, and can reciprocate lithium ions between the two electrodes for charging and discharging. In the past, in lithium ion secondary batteries, organic electrolytic solutions have been used as electrolytes. However, the organic electrolyte is prone to liquid leakage, and may be ignited due to short-circuiting inside the battery due to overcharge or overdischarge, so it is necessary to further improve safety and reliability. [0003] Under such circumstances, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01B1/06H01B13/00H01M4/13H01M4/62H01M10/0585
CPCH01M4/13H01M4/62H01B1/06H01B13/00Y02E60/10H01M10/0525H01M10/0562Y02P70/50H01M10/0585H01M2300/0068H01M2300/0091
Inventor 串田阳牧野雅臣三村智则望月宏显
Owner FUJIFILM CORP
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