Non-aqueous electrolyte storage element including positive electrode having solid electrolyte interface material on surface of carbon material

Patent metadata

Field	Value
Publication number	US-10297828-B2
Application number	US-201715611261-A
Country	US
Kind code	B2
Filing date	Jun 1, 2017
Priority date	Jun 15, 2016
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

To provide a non-aqueous electrolyte storage element including a positive electrode including a positive-electrode active material capable of inserting and eliminating anions, a negative electrode including a negative-electrode active material, and a non-aqueous electrolyte, wherein the positive-electrode active material includes a carbon material which has a plurality of pores constituting a three-dimensional network structure and has a solid electrolyte interface (SEI) material on a surface of the carbon material.

First claim

What is claimed is:

1. A non-aqueous electrolyte storage element comprising:
a positive electrode including a positive-electrode active material into which anions are inserted during charging of the non-aqueous electrolyte storage element, and from which the anions are eliminated during discharging of the non-aqueous electrolyte storage element;
a negative electrode including a negative-electrode active material; and
a non-aqueous electrolyte,
wherein the positive-electrode active material including a carbon material which has a plurality of mesopores constituting a three-dimensional network structure,
the non-aqueous electrolyte storage element further including a solid electrolyte interface (SEI) material contacting a surface of the positive electrode.

2. The non-aqueous electrolyte storage element according to claim 1 ,
wherein the solid electrolyte interface (SEI) material includes lithium fluoride.

3. The non-aqueous electrolyte storage element according to claim 1 ,
wherein the positive electrode has a peak in a range of 685 eV or greater but 687 eV or less, when the positive electrode is measured by X-ray photoelectron spectroscopy (XPS).

4. The non-aqueous electrolyte storage element according to claim 1 ,
wherein a ratio of a solid electrolyte interface (SEI) on the surface of the positive electrode is 58% or lower.

5. The non-aqueous electrolyte storage element according to claim 1 ,
wherein a ratio of a solid electrolyte interface (SEI) on the surface of the positive electrode is 13% or greater but 58% or less.

6. The non-aqueous electrolyte storage element according to claim 1 , wherein a BET specific surface area of the carbon material is 50 m 2 /g or greater, and a pore volume of the carbon material is 0.2 mL/g or greater but 2.3 mL/g or less.

7. The non-aqueous electrolyte storage element according to claim 1 , wherein the plurality of mesopores constituting the three-dimensional network structure of the carbon material have diameters of 2 nm or greater but 50 nm or less.

8. The non-aqueous electrolyte storage element according to claim 1 , wherein the negative-electrode active material includes a carbonaceous material, or lithium titanate, or both.

9. The non-aqueous electrolyte storage element according to claim 1 , wherein the non-aqueous electrolyte includes LiPF 6 or LiBF 4 , or both.

10. The non-aqueous electrolyte storage element according to claim 1 , further comprising a separator between the positive electrode and the negative electrode.

Assignees

• Araki Yuka
• Abe Naoto
• Itoh Yoshio
• Dan Tatsuya
• Takeshita Shuhei
• Ricoh Co Ltd

Inventors

• Araki Yuka
• Abe Naoto
• Itoh Yoshio
• Dan Tatsuya
• Takeshita Shuhei

Classifications

• H01M10/0568

  characterised by the solutes · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/587 Primary

  for inserting or intercalating light metals · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M10/052

  Li-accumulators · CPC title