All-solid-state lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-11600846-B2
Application number	US-201816007621-A
Country	US
Kind code	B2
Filing date	Jun 13, 2018
Priority date	Jul 6, 2017
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

Disclosed is an all-solid-state lithium ion secondary battery excellent in cycle characteristics. The battery may be an all-solid-state lithium ion secondary battery, wherein an anode comprises anode active material particles, an electroconductive material and a solid electrolyte; wherein the anode active material particles comprise at least one active material selected from the group consisting of elemental silicon and SiO; and wherein a BET specific surface area of the anode active material particles is 1.9 m2/g or more and 14.2 m2/g or less.

First claim

The invention claimed is:

1. An all-solid-state lithium ion secondary battery comprising an anode, the anode comprising:
anode active material particles;
an electroconductive material; and
a solid electrolyte;
wherein:
the anode active material particles comprise at least one active material selected from the group consisting of elemental silicon and SiO,
the anode active material particles have a mean diameter D50 in the range of from 2.4 μm to 6.0 μm,
a BET specific surface area (S) of the anode active material particles is 1.9 m 2 /g or more and 14.2 m 2 /g or less, and
a C/S value is 0.18 or more and 6.03 or less, wherein:
C/S value=a volume percentage (%) of the electroconductive material (C) in the anode /the BET specific surface area (S).

2. The all-solid-state lithium ion secondary battery according to claim 1 , wherein the solid electrolyte is a sulfide-based solid electrolyte.

3. The all-solid-state lithium ion secondary battery according to claim 1 , wherein the electroconductive material is at least one carbonaceous material selected from the group consisting of carbon black, carbon nanotube and carbon nanofiber.

4. The all-solid-state lithium ion secondary battery according to claim 1 , wherein an amount of the solid electrolyte in the anode is 10 mass % or more.

5. The all-solid-state lithium ion secondary battery according to claim 1 , wherein an amount of the solid electrolyte in the anode is in the range of from 20 mass % to 50 mass %.

6. The all-solid-state lithium ion secondary battery according to claim 1 , wherein an amount of the solid electrolyte in the anode is in the range of from 25 mass % to 45 mass %.

7. The all-solid-state lithium ion secondary battery according to claim 1 , wherein a ratio of the anode active material (mass %) to the solid electrolyte (mass %) in the anode is from 85:15 to 30:70.

8. The all-solid-state lithium ion secondary battery according to claim 1 , wherein a ratio of the anode active material (mass %) to the solid electrolyte (mass %) in the anode is from 80:20 to 40:60.

9. The all-solid-state lithium ion secondary battery according to claim 1 , wherein the mean diameter D50 of the anode active material particles is in the range of from 2.4 μm to 5.6 μm.

10. The all-solid-state lithium ion secondary battery according to claim 1 , wherein the volume percentage (%) of the electroconductive material (C) is in the range of from 2.5 volume % to 13.2 volume %.

11. The all-solid-state lithium ion secondary battery according to claim 1 , wherein the volume percentage (%) of the electroconductive material (C) is in the range of from 2.5 volume % to 9.2 volume %.

Assignees

• Toyota Motor Co Ltd

Inventors

• Otaki Mitsutoshi
• Ose Norihiro
• Hama Shigenori
• Taniguchi Kazuyuki
• Yamada Yoshiyasu
• Nakanishi Tetsuo

Classifications

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M10/0525 Primary

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

• H01M4/625

  Carbon or graphite · CPC title