Solid electrolyte composition, method for manufacturing the same, and electrode sheet for battery and all-solid-state secondary battery in which solid electrolyte composition is used

Patent metadata

Field	Value
Publication number	US-2016359194-A1
Application number	US-201615243155-A
Country	US
Kind code	A1
Filing date	Aug 22, 2016
Priority date	Feb 24, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

Provided is a solid electrolyte composition including inorganic solid electrolyte particles exhibiting at least two peaks in accumulative particle size distribution which is measured with a dynamic light scattering-type particle diameter distribution measuring device.

First claim

What is claimed is:

1 . A solid electrolyte composition comprising:
inorganic solid electrolyte particles exhibiting at least two peaks in accumulative particle size distribution which is measured with a dynamic light scattering-type particle diameter distribution measuring device.

2 . The solid electrolyte composition according to claim 1 ,
wherein, among the two or more peaks, a peak (Pa) of a maximum particle diameter is in the particle diameter range of 2 μm to 0.4 μm and a peak (Pb) of a minimum particle diameter is in the range of 1.5 μm to 0.1 μm, and a relationship between the peak (Pa) of the maximum particle diameter and the peak (Pb) of the minimum particle diameter satisfies Expression (1) below.
0.05≦ Pb/Pa≦ 0.75  (1)

3 . The solid electrolyte composition according to claim 1 ,
wherein the inorganic solid electrolyte particles include inorganic solid electrolyte particles A having an average particle diameter (da) of 2 μm to 0.4 μm and inorganic solid electrolyte particles B having an average particle diameter (db) of 1.5 μm to 0.1 μm, and Expression (2) below is satisfied.
0.05≦ db/da≦ 0.75  (2)

4 . The solid electrolyte composition according to claim 1 ,
wherein, with respect to the accumulative particle size distribution measured with the dynamic light scattering-type particle diameter distribution measuring device, when respective peaks are assumed to follow log-normal distribution and the waveform is separated by a nonlinear least square method, an accumulative 90% particle diameter (Pa90) of a peak (Pa) of a maximum particle diameter is 3.4 μm to 0.7 μm, and an accumulative 90% particle diameter (Pb90) of a peak (Pb) of a minimum particle diameter is 2.5 μm to 0.2 μm.

5 . The solid electrolyte composition according to claim 1 ,
wherein, with respect to the accumulative particle size distribution measured with the dynamic light scattering-type particle diameter distribution measuring device, when respective peaks are assumed to follow log-normal distribution and the waveform is separated by a nonlinear least square method, a ratio of an area (WPa) of a peak (Pa) of a maximum particle diameter and an area (WPb) of a peak (Pb) of a minimum particle diameter satisfies Expression (3) below.
0.01≦ WPb /( WPa+WPb )≦0.8  (3)

6 . The solid electrolyte composition according to claim 3 ,
wherein an addition amount (Wb) of the inorganic solid electrolyte particles B having an average particle diameter (db) of 1.5 μm to 0.1 μm is smaller than an addition amount (Wa) of the inorganic solid electrolyte particles A having the average particle diameter (da) of 2 μm to 0.4 μm, and a mass ratio thereof satisfies Expression (4) below.
0.01≦ Wb /( Wa+Wb )≦0.8  (4)

7 . The solid electrolyte composition according to claim 1 ,
wherein the inorganic solid electrolyte particles are oxide-based or sulfide-based inorganic solid electrolyte particles.

8 . The solid electrolyte composition according to claim 1 , further comprising:
a binder.

9 . The solid electrolyte composition according to claim 1 , further comprising:
a dispersion medium.

10 . A method for manufacturing a solid electrolyte composition prepared by mixing inorganic solid electrolyte particles A and inorganic solid electrolyte particles B,
wherein the inorganic solid electrolyte particles A have an average particle diameter (da) of 2 μm to 0.4 μm, wherein the inorganic solid electrolyte particles B have an average particle diameter (db) of 1.5 μm to 0.1 μm, and wherein Expression (2) below is satisfied.
0.05≦ db/da≦ 0.75  (2)

11 . The method for manufacturing the solid electrolyte composition according to claim 10 ,
wherein the inorganic solid electrolyte particles A have an accumulative 90% particle diameter of 3.4 μm to 0.7 μm, and wherein the inorganic solid electrolyte particles B have an accumulative 90% particle diameter of 2.5 μm to 0.2 μm.

12 . The method for manufacturing the solid electrolyte composition according to claim 10 ,
wherein an addition amount (Wa) of the inorganic solid electrolyte particles A and an addition amount (Wb) of the inorganic solid electrolyte particles B satisfy Expression (4) below.
0.01≦ Wb /( Wa+Wb )≦0.8  (4)

13 . The method for manufacturing the solid electrolyte composition according to claim 10 ,
wherein the inorganic solid electrolyte particles A and the inorganic solid electrolyte particles B are treated at least by a wet dispersion method or a dry dispersion method, respectively, and the inorganic solid electrolyte particles A and the inorganic solid electrolyte particles B are mixed.

14 . An electrode sheet for a battery comprising:
the solid electrolyte composition according to claim 1 .

15 . An all-solid-state secondary battery comprising:
the electrode sheet for a battery according to claim 14 .

Assignees

• Fujifilm Corp

Inventors

• Meguro Katsuhiko
• Mochizuki Hiroaki
• Makino Masaomi
• Mimura Tomonori

Classifications

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title