Nonaqueous electrolytic capacitor element

Patent metadata

Field	Value
Publication number	US-9754726-B2
Application number	US-201314441749-A
Country	US
Kind code	B2
Filing date	Nov 11, 2013
Priority date	Nov 12, 2012
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

To provide a nonaqueous electrolytic capacitor element, which contains: a positive electrode containing a positive electrode active material capable of intercalating or deintercalating anions; a negative electrode containing a negative electrode active material; and a nonaqueous electrolyte, which contains a nonaqueous solvent, an electrolyte salt containing a halogen atom, and a compound having a site capable of bonding to an anion containing a halogen atom.

First claim

The invention claimed is:

1. A nonaqueous electrolytic capacitor element, comprising:
a positive electrode comprising a positive electrode active material capable of intercalating or deintercalating anions,
a negative electrode comprising carbon powder as a negative electrode active material, wherein the carbon powder of the negative electrode active material has a BET specific surface area by nitrogen adsorption of 4,600 m 2 /g, and
a nonaqueous electrolyte, which comprises a nonaqueous solvent, an electrolyte salt consisting of LiPF 6 , and a compound comprising a site capable of bonding to a halogen-containing anion, wherein the compound comprising a site capable of bonding to a halogen-containing anion is at least one member selected from the group consisting of a compound represented by formula (1), and a compound represented by formula (2):

where R 1 , R 2 and R 3 are independently an alkyl group, an aryl group, or a heteroaryl group, each of which is optionally substituted with a halogen atom, an alkyl group, an alkoxide group, a thiol group, a thioalkoxide group, an aryl group, an ether group, or a thioether group,

where R 4 , R 5 and R 6 are independently an alkyl group, an aryl group, or a heteroaryl group, each of which is optionally substituted with a halogen atom, an alkyl group, an alkoxide group, a thiol group, a thioalkoxide group, an aryl group, an ether group, or a thioether group; and wherein an amount of the compound comprising a site capable of bonding to an a halogen containing anion comprising a halogen atom is 0.5% by mass or greater and 5% by mass or less relative to an amount of the nonaqueous electrolyte;
wherein the electrolyte salt is present in an amount higher than 2 mol/L, and wherein the capacitor element has a maximum voltage during charging that is higher than 4.5 V.

2. The nonaqueous electrolytic capacitor element according to claim 1 , wherein the compound comprising a site capable of bonding to a halogen-containing anion is at least one of tris(pentafluorophenyl)borane and tris(hexafluoroisopropyl)borate.

3. The nonaqueous electrolytic capacitor element according to claim 1 , wherein a maximum voltage of the nonaqueous electrolytic capacitor element during charging and discharging is 4.5 V to 6.0 V.

4. The nonaqueous electrolytic capacitor element according to claim 1 , wherein the negative electrode active material is a carbon powder capable of storing or releasing at least one of metallic lithium and lithium ion.

5. The nonaqueous electrolytic capacitor element according to claim 1 , wherein
the nonaqueous solvent in the nonaqueous electrolyte comprises dimethyl carbonate, and
an amount of dimethyl carbonate is 70% by mass or greater relative to an amount of the nonaqueous solvent.

Assignees

• Onagi Nobuaki
• Kimura Okitoshi
• Hibino Eiko
• Kamezaki Hisamitsu
• Ishihara Tatsumi
• Ricoh Co Ltd
• Univ Kyushu

Inventors

• Onagi Nobuaki
• Kimura Okitoshi
• Hibino Eiko
• Kamezaki Hisamitsu
• Ishihara Tatsumi

Classifications

• H01G11/64

  characterised by additives · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M4/583

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

• H01M10/0569

  characterised by the solvents · CPC title

• H01M10/0567

  characterised by the additives · CPC title