P
USRE44489EExpiredUtilityPatentIndex 52

Electrolytic solution and battery

Assignee: YAMAGUCHI AKIRAPriority: Nov 5, 2004Filed: May 18, 2012Granted: Sep 10, 2013
Est. expiryNov 5, 2024(expired)· nominal 20-yr term from priority
Inventors:YAMAGUCHI AKIRAKUBOTA TADAHIKOKAWASHIMA ATSUMICHIKITA AKINORIMIZUTANI SATOSHIINOUE HIROSHI
H01M 4/58H01M 6/168H01M 2004/027H01M 4/525H01M 10/0567H01M 10/0431H01M 4/38H01M 10/4235H01M 10/052H01M 4/387H01M 4/386H01M 10/0436H01M 10/0525H01M 4/131H01M 4/134H01M 10/05Y02E60/10
52
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Cited by
24
References
39
Claims

Abstract

A battery capable of improving battery characteristics such as cycle characteristics is provided. An electrolytic solution is impregnated in a separator. The electrolytic solution contains 4-fluoro-1,3-dioxolane-2-one. Fluorine ion content in the electrolytic solution is preferably from 10 weight ppm to 3200 weight ppm. Thereby, chemical stability of the electrolytic solution is improved, and cycle characteristics are improved. The present invention is effective for the case using an anode active material containing Sn or Si as an element for an anode.

Claims

exact text as granted — not AI-modified
The invention is claimed as follows: 
     
       1. A solution comprising an electrolytic solution comprising 4-fluoro-1,3-dioxolane-2-one and fluorine ions, wherein the fluorine ion content in the electrolytic solution ranges from about 14 weight ppm to about 1290 weight ppm. 
     
     
       2. A solution according to  claim 1 , wherein the 4-fluoro-1,3-dioxolane-2-one comprises fluorine ions as an impurity, the impurity ranges from about 10 weight ppm to about 3200 weight ppm. 
     
     
       3. A solution according to  claim 1  further containing nitrile. 
     
     
       4. A battery comprising:
 a cathode; 
 an anode; and 
 an electrolytic solution, 
 wherein the electrolytic solution contains 4-fluoro-1,3-dioxolane-2-one and fluorine ions, wherein the fluorine ion content in the electrolytic solution that ranges from about 14 weight ppm to about 1290 weight ppm. 
 
     
     
       5. A battery according to  claim 4 , wherein the 4-fluoro-1,3-dioxolane-2-one comprises fluorine ions as an impurity, the impurity ranges from about 10 weight ppm to about 3200 weight ppm. 
     
     
       6. A battery according to  claim 4 , wherein the electrolytic solution further contains nitrile. 
     
     
       7. A battery according to  claim 4 , wherein the anode contains an anode material containing at least one of tin and silicon. 
     
     
       8. A battery according to  claim 7 , wherein the anode material further contains at least one of nickel, copper, iron, cobalt, manganese, zinc, indium, silver, titanium, germanium, bismuth, antimony, and chromium. 
     
     
       9. A battery according to  claim 7  wherein the anode material contains tin, cobalt, and carbon, in which a carbon content of the anode material is from about 9.9 wt % to about 29.7 wt %, and a ratio of cobalt to a sum of tin and cobalt is from about 30 wt % to about 70 wt %. 
     
     
       10. A battery according to  claim 9 , wherein the anode material obtains a 1s peak of carbon in a region lower than 284.5 eV by X-ray photoelectron spectroscopy. 
     
     
       11. A battery according to  claim 4 , wherein the cathode contains a complex oxide containing lithium and nickel. 
     
     
       12. A solution according to  claim 1 , wherein the fluorine ion content in the electrolytic solution ranges from about 30 weight ppm to about 1290 weight ppm. 
     
     
       13. A solution according to  claim 1 , wherein the fluorine ion content in the electrolytic solution ranges from about 30 weight ppm to about 570 weight ppm. 
     
     
       14. A battery according to  claim 4 , wherein the fluorine ion content in the electrolytic solution ranges from about 30 weight ppm to about 1290 weight ppm. 
     
     
       15. A battery according to  claim 4 , wherein the fluorine ion content in the electrolytic solution ranges from about 30 weight ppm to about 570 weight ppm. 
     
     
       16. A solution according to  claim 1 , further containing nitrile in an amount of between about 0.1 wt % and 3.0 wt %. 
     
     
       17. A solution according to  claim 1 , further containing nitrile in an amount of between about 0.1 wt % and 2.0 wt %. 
     
     
       18. A battery according to  claim 4 , wherein the electrolytic solution further contains nitrile in an amount of between about 0.1 wt % and 3.0 wt %. 
     
     
       19. A battery according to  claim 4 , wherein the electrolytic solution further contains nitrile in an amount of between about 0.1 wt % and 2.0 wt %. 
     
     
       20. A battery according to claim 4, further containing a lithium salt wherein the lithium salt is at least one selected from the group consisting of LiPF 6 , LiBF 4 , LiClO 4 , LiAsF 6 , LiN(CF 3 SO 2 ) 2 , LiN(C 2 F 5 SO 2 ) 3  LiB(C 6 H 5 ) 4 , LiB(C 2 O 4 ) 2 , LiCF 3 SO 3 , LiCl, and LiBr. 
     
     
       21. A method of manufacturing a solution, the method comprising:
 forming an electrolytic solution including 4-fluoro-1,3-dioxolane-2-one and fluorine ions, wherein the fluorine ion content in the electrolytic solution ranges from about 14 weight ppm to about 1290 weight ppm.   
     
     
       22. The method of manufacturing a solution according to claim 21, wherein the 4-fluoro-1,3-dioxolane-2-one comprises fluorine ions as an impurity, and the impurity ranges from about 10 weight ppm to about 3200 weight ppm. 
     
     
       23. The method of manufacturing a solution according to claim 21, wherein the fluorine ion content in the electrolytic solution ranges from about 30 weight ppm to about 1290 weight ppm. 
     
     
       24. The method of manufacturing a solution according to claim 21, wherein the fluorine ion content in the electrolytic solution ranges from about 30 weight ppm to about 570 weight ppm. 
     
     
       25. The method of manufacturing a solution according to claim 21, wherein the electrolytic solution further contains nitrile in an amount of between about 0.1 wt % and 3.0 wt %. 
     
     
       26. The method of manufacturing a solution according to claim 21, wherein the electrolytic solution further contains nitrile in an amount of between about 0.1 wt % and 2.0 wt %. 
     
     
       27. The method of manufacturing a solution according to claim 21, wherein preparing the electrolytic solution further includes mixing in at least one lithium salt selected from the group consisting of LiPF 6 , LiBF 4 , LiClO 4 , LiAsF 6 , LiN(CF 3 SO 2 ) 2 , LiN(C 2 F 5 SO 2 ) 2 , LiC(CF 3 SO 2 ) 3 , LiB(C 6 H 5 ) 4 , LiB(C 2 O 4 ) 2 , LiCF 3 SO 3 , LiCH 3 SO 3 , LiCl, and LiBr. 
     
     
       28. A method of manufacturing a battery, the method comprising:
 forming a solution comprising an electrolytic solution including 4-fluoro-1,3-dioxolane-2-one and fluorine ions, wherein the fluorine ion content in the electrolytic solution ranges from about 14 weight ppm to about 1290 weight ppm.   
     
     
       29. The method of manufacturing a battery according to claim 28, further comprising impregnating the electrolytic solution into a separator of the battery. 
     
     
       30. The method of manufacturing a battery according to claim 28, the method further comprising:
 forming a cathode by preparing a cathode mixture, dispersing the cathode mixture in a solvent to produce a cathode mixture slurry, coating faces of a cathode current collector with the cathode mixture slurry, and drying the cathode current collector to thereby form the cathode; and   forming an anode by preparing an anode mixture, dispersing the anode mixture in a solvent to produce an anode mixture slurry, coating faces of an anode current collector with the anode mixture slurry, and drying the anode current collector to thereby form the anode.   
     
     
       31. The method of manufacturing a battery according to claim 30, the method further comprising winding the cathode and the anode a plurality of times along with a separator. 
     
     
       32. The method of manufacturing a battery according to claim 31, the method further comprising inserting the wound anode, cathode and separator in a housing. 
     
     
       33. The method of manufacturing a battery according to claim 32, the method further comprising injecting the electrolytic solution into the housing. 
     
     
       34. The method of manufacturing a battery according to claim 28, wherein the 4-fluoro-1,3-dioxolane-2-one comprises fluorine ions as an impurity, and the impurity ranges from about 10 weight ppm to about 3200 weight ppm. 
     
     
       35. The method of manufacturing a battery according to claim 28, wherein the fluorine ion content in the electrolytic solution ranges from about 30 weight ppm to about 1290 weight ppm. 
     
     
       36. The method of manufacturing a battery according to claim 28, wherein the fluorine ion content in the electrolytic solution ranges from about 30 weight ppm to about 570 weight ppm. 
     
     
       37. The method of manufacturing a battery according to claim 28, wherein the electrolytic solution further contains nitrile in an amount of between about 0.1 wt % and 3.0 wt %. 
     
     
       38. The method of manufacturing a battery according to claim 28, wherein the electrolytic solution further contains nitrile in an amount of between about 0.1 wt % and 2.0 wt %. 
     
     
       39. The method of manufacturing a battery according to claim 28, wherein preparing the electrolytic solution further includes mixing in at least one lithium salt selected from the group consisting of LiPF 6 , LiBF 4 , LiClO 4 , LiAsF 6 , LiN(CF 3 SO 2 ) 2 , LiN(C 2 F 5 SO 2 ) 2 , LiC(CF 3 SO 2 ) 3 , LiB(C 6 H 5 ) 4 , LiB(C 2 O 4 ) 2 , LiCF 3 SO 3 , LiCH 3 SO 3 , LiCl, and LiBr.

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