Claims
- 1. A lithium secondary battery, comprising a cathode, an anode and lithium ion conductive electrolytic solution, each electrode containing an active material capable of incorporating and releasing lithium ions,wherein the anode comprises a sintered material which contains 50 to 99% by weight of silicon and 1 to 50% by weight of a carbonaceous material, and the sintered material has an electrical conductivity not less than 1 S/cm, and wherein the electrolytic solution contains fluorine-containing lithium salt, and the concentration of hydrogen fluoride in the electrolytic solution is not more than 250 μg/g.
- 2. The lithium secondary battery of claim 1, wherein silicon contained in the sintered material is in the form of particles, and the particles are covered with a carbonaceous material.
- 3. The lithium secondary battery of claim 1, wherein an amount of lithium which is equivalent to 200 to 800 mAh per 1 g of silicon is incorporated in the anode when fully charged.
- 4. The lithium secondary battery of claim 1, wherein the concentration of hydrogen fluoride in the electrolytic solution is not more than 150μg/g.
- 5. The lithium secondary battery of claim 4, wherein the concentration of hydrogen fluoride in the electrolytic solution is not more than 100 μg/g.
- 6. The lithium secondary battery of claim 1, wherein said sintered material of said anode contains not less than 5% by weight of binder used to form said anode.
- 7. The lithium secondary battery of claim 6, wherein said sintered material of said anode contains not less than 10% by weight of binder used to form said anode.
- 8. The lithium secondary battery of claim 1, wherein said sintered material of said anode contains 70% by weight or more or said silicon.
- 9. The lithium secondary battery of claim 2, wherein said silicon particles have a particle size of 0.5 to 100 μm.
- 10. The lithium secondary battery of claim 1, wherein said cathode is made of a lithium-containing metal oxide containing cobalt.
- 11. The lithium secondary battery of claim 1, wherein said cathode is made of a lithium-containing metal oxide containing manganese.
- 12. The lithium secondary battery of claim 1, wherein said cathode is made of a lithium-containing metal oxide containing nickel.
- 13. The lithium secondary battery of claim 1, wherein said cathode is made of V2O5 or TiS2.
- 14. The lithium secondary battery of claim 1, wherein the sintered material of said anode contains substantially no SiC.
- 15. The lithium secondary battery of claim 1, wherein the sintered material of said anode has a structure such that a dispersed phase of silicon exists in a continuous phase of the carbonaceous material.
- 16. The lithium secondary battery of claim 2, wherein said silicon particles have a purity of 99.9% and a size of 7 μm.
- 17. A process for producing a lithium secondary battery, which comprises the steps of providing a cathode and an anode, each electrode containing an active material capable of incorporating and releasing lithium ions, and an electrolytic solution; the anode being formed by the steps of:a) forming a coated film consisting of silicon and a binder that forms non-graphitizable carbon through heat treatment on a current collector; and b) sintering the coated film in a non-oxidizing atmosphere, thereby integrating a sintered material of the coated film with the current collector; and wherein said electrolytic solution contains fluorine-containing lithium salt, wherein the concentration of hydrogen fluoride in the electrolytic solution is not more than 250 μg/g.
Priority Claims (4)
Number |
Date |
Country |
Kind |
10-361913 |
Dec 1998 |
JP |
|
11-050293 |
Feb 1999 |
JP |
|
11-050644 |
Feb 1999 |
JP |
|
11-176606 |
Jun 1999 |
JP |
|
Parent Case Info
This application is a 371 of PCT/JP99/06776 filed Dec. 2, 1999, now WO00/33404 issued Aug. 6, 2000.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP99/06776 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO00/33404 |
6/8/2000 |
WO |
A |
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
5340670 |
Takami et al. |
Aug 1994 |
A |
6090505 |
Shimamura et al. |
Jul 2000 |
A |
6117591 |
Takeuchi et al. |
Sep 2000 |
A |
6171725 |
Suzuki et al. |
Jan 2001 |
B1 |
Foreign Referenced Citations (3)
Number |
Date |
Country |
WO-9824135 |
Jun 1998 |
JP |
11-97014 |
Apr 1999 |
JP |
2948205 |
Jul 1999 |
JP |