Electrolyte for Li storage battery and Li storage battery

• US 9,287,584 B2
• Filed: 02/26/2013
• Issued: 03/15/2016
• Est. Priority Date: 03/06/2012
• Status: Expired due to Fees

• Current Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Original Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Inventors: Omaru, Atsuo, Nishizawa, Takeshi
• Primary Examiner(s): Slifka, Sarah A
• Application Number:
  US14/383,126
• Publication Number:
  US 20150079482A1
• Time in Patent Office: 1,113 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0567 characterised by the additives
• CPC Class Codes: H01M 10/0569 characterised by the solvents
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/491 Porosity
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

The present invention provides an electrolyte for a Li storage battery comprising a compound that can improve safety of a storage battery without causing the degradation in performances thereof and a Li storage battery comprising the electrolyte. The electrolyte comprises at least 1,1-diphenylethane the Li storage battery comprises the electrolyte. Particularly preferably provided are an electrolyte for a Li storage battery comprising 1,1-diphenylethane, a cyclic carbonate (e.g., ethylene carbonate), a chain carbonate (e.g., dimethyl carbonate, diethyl carbonate, ethyl methyl or ethylmethyl carbonate) and a Li salt and a Li storage battery comprising such an electrolyte.

Claims

1. An electrolyte for a Li storage battery comprising 1,1-diphenylethane.

3. The electrolyte for a Li storage battery according to claim 1 wherein the concentration of 1,1-diphenylethane in the electrolyte is from 3 to 35 percent by mass.

9. A Li storage battery comprising the electrolyte according to claim 1.

10. The Li storage battery according to claim 9 further comprising a separator comprising polypropylene.

11. The Li storage battery according to claim 9 comprising an anode active material where lithium can be inserted or an anode active material capable of reacting with lithium.

12. The Li storage battery according to claim 9 comprising a carbonaceous anode material.

13. The Li storage battery according to claim 9 wherein the anode comprises graphite.

14. The Li storage battery according to claim 9 wherein the cathode comprises lithium and transition metal.

15. The Li storage battery according to claim 9 wherein the cathode comprises a layered oxide containing cobalt.

16. The Li storage battery according to claim 9 having a structure where the cathode or anode is not wound.

2. An electrolyte for a Li storage battery comprising 1,1-diphenylethane, a cyclic carbonate, a chain carbonate and a Li salt.

4. The electrolyte for a Li storage battery according to claim 2 wherein the concentration of the cyclic carbonate in the electrolyte is from 1 to 35 percent by mass.

5. The electrolyte for a Li storage battery according to claim 2 wherein the concentration of the chain carbonate in the electrolyte is from 40 to 70 percent by mass.

6. The electrolyte for a Li storage battery according to claim 2 wherein the cyclic carbonate is ethylene carbonate.

7. The electrolyte for a Li storage battery according to claim 2 wherein the chain carbonate is any one of dimethyl carbonate, diethyl carbonate and ethylmethyl carbonate.

8. The electrolyte for a Li storage battery according to claim 2 wherein the Li salt concentration is from 7 to 35 percent by mass.