Energy storage device

Patent metadata

Field	Value
Publication number	US-9865878-B2
Application number	US-201615072506-A
Country	US
Kind code	B2
Filing date	Mar 17, 2016
Priority date	Mar 20, 2015
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

An energy storage device includes a positive electrode, a negative electrode, and a nonaqueous electrolyte solution. The negative electrode includes an active material layer, and the active material layer has pores having a pore size of 0.1 μm or more and 1.0 μm or less, and a total volume of the pores is 0.26 cm 3 /g or more and 0.46 cm 3 /g or less.

First claim

What is claimed is:

1. An energy storage device comprising:
a positive electrode;
a negative electrode; and
a nonaqueous electrolyte solution,
wherein the negative electrode includes an active material layer containing a non-graphitizable carbon, and
the active material layer has pores having a pore size of 0.1 μm or more and 1.0 μm or less, and a total volume of the pores is 0.26 cm 3 /g or more and 0.46 cm 3 /g or less.

2. The energy storage device according to claim 1 , wherein a 90% cumulative diameter (D90) in a volume based particle size distribution of the non-graphitizable carbon is 1.9 μm or more and 11.5 μm or less.

3. The energy storage device according to claim 1 , wherein a 90% cumulative diameter (D90) in a volume based particle size distribution of the non-graphitizable carbon is 1.9 μm or more and 8.5 μm or less.

4. The energy storage device according to claim 1 , wherein a 90% cumulative diameter (D90) in a volume based particle size distribution of the non-graphitizable carbon is 1.9 μm or more and 4.3 μm or less.

5. The energy storage device according to claim 1 , wherein a 90% cumulative diameter (D90) in a volume based particle size distribution of the non-graphitizable carbon is 1.9 μm or more and 3.7 μm or less.

6. The energy storage device according to claim 1 , wherein the active material layer contains a binder, and the binder is an aqueous binder.

7. The energy storage device according to claim 1 , wherein the energy storage device includes a separator arranged between the positive electrode and the negative electrode, and the separator has an inorganic layer.

8. The energy storage device according to claim 1 , wherein the energy storage device includes a separator arranged between the positive electrode and the negative electrode, and the separator has an inorganic layer at least on a positive electrode side thereof.

9. The energy storage device according to claim 1 , wherein, in the negative active material layer, a packing density of the active material is 0.9 g/cm 3 or more and 1.04 g/cm 3 or less.

10. An energy storage device comprising:
a positive electrode;
a negative electrode; and
a nonaqueous electrolyte solution,
wherein the negative electrode includes an active material layer, and the active material layer has pores having a pore size of 0.1 μm or more and 1.0 μm or less, and a total volume of the pores is 0.26 cm 3 /g or more and 0.46 cm 3 /g or less.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Nakai Kenta
• Miyazaki Akihiko
• Kako Tomonori
• Mori Sumio

Classifications

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01G11/24

  characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor · CPC title

• H01M10/0525

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