SI/C COMPOSITE, ANODE ACTIVE MATERIALS, AND LITHIUM BATTERY INCLUDING THE SAME
원문보기
IPC분류정보
국가/구분
United States(US) Patent
공개
국제특허분류(IPC7판)
H01M-004/36
C09K-003/00
H01B-001/24
출원번호
US-0118972
(2008-05-12)
공개번호
US-0029256
(2009-01-29)
우선권정보
KR-2007-75911(2007-07-27)
발명자
/ 주소
MAH,Sang kook
KIM,Han su
출원인 / 주소
Samsung SDI Co., Ltd.
대리인 / 주소
STEIN, MCEWEN & BUI, LLP
인용정보
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초록
An Si/C composite includes carbon (C) dispersed in porous silicon (Si) particles. The Si/C composite may be used to form an anode active material to provide a lithium battery having a high capacity and excellent capacity retention.
대표청구항▼
What is claimed is: 1. An Si/C composite having carbon (C) dispersed in porous silicon (Si) particles. 2. The Si/C composite of claim 1, wherein the amount of carbon in the Si/C composite ranges from about 1 to about 70% by weight relative to the total weight of the Si/C composite. 3. The Si/C
What is claimed is: 1. An Si/C composite having carbon (C) dispersed in porous silicon (Si) particles. 2. The Si/C composite of claim 1, wherein the amount of carbon in the Si/C composite ranges from about 1 to about 70% by weight relative to the total weight of the Si/C composite. 3. The Si/C composite of claim 1, wherein the carbon is crystalline carbon or amorphous carbon. 4. The Si/C composite of claim 1, wherein the porous silicon particles have a diameter in a range from about 0.01 to about 100 μm. 5. The Si/C composite of claim 1, further comprising carbon on an outer shell of the porous silicon particles. 6. The Si/C composite of claim 1, further comprising silicon carbide (SiC). 7. A method for preparing an Si/C composite, comprising: mixing an alkali metal or an alkali earth metal with a silica/C composite and subjecting the mixture of the alkali metal or alkali earth metal and the silica/C composite to heat treatment under an inert atmosphere to reduce the silica; and treating the resultant product of the heat treatment with acid to remove impurities. 8. The method of claim 7, wherein the silica/C composite is obtained by mixing silicon oxide and carbon. 9. The method of claim 7, wherein the silica/C composite is obtained by mixing silicon oxide and a carbon precursor, a silicon oxide precursor and carbon, or a silicon oxide precursor and a carbon precursor, and performing a pre-heat treatment on the resultant mixture under inert atmosphere. 10. The method of claim 8, wherein the silicon oxide is at least one selected from the group consisting of SiO, SiO2, silica gel, glass, quartz and zeolite. 11. The method of claim 8, wherein the carbon is at least one selected from the group consisting of natural graphite, artificial graphite, carbon particles, and carbon nanotubes. 12. The method of claim 9, wherein the silicon oxide precursor is a silicon alkoxide or silicon halide. 13. The method of claim 9, wherein the carbon precursor is pitch or a hydrocarbon-based material. 14. The method of claim 7, further comprising coating the product of the heat treatment with carbon. 15. The method of claim 7, wherein the alkali metal is lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), or francium (Fr). 16. The method of claim 7, wherein the alkaline earth metal is beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), or radium (Ra). 17. The method of claim 7, wherein the heat treatment is performed at a temperature in a range of between about 350 and 1400�� C. for 1 minute to 100 hours. 18. The method of claim 9, wherein the pre-heat treatment is performed at a temperature in a range of between about 350 and 1400�� C. for 1 minute to 100 hours. 19. An Si/C composite formed by a process comprising: mixing an alkali metal or an alkali earth metal with a silica/C composite and subjecting the mixture of the alkali metal or alkali earth metal and the silica/C composite to heat treatment under an inert atmosphere to reduce the silica; and treating the resultant product of the heat treatment with acid to remove impurities, thereby forming the Si/C composite. 20. An anode active material comprising the Si/C composite of claim 1. 21. The anode active material of claim 20, further comprising carbon on the outer shell of the porous silicon particles. 22. The anode active material of claim 20, further comprising a material that can be alloyed with lithium. 23. The anode active material of claim 22, wherein the material that can be alloyed with lithium is at least one selected from the group consisting of Si, SiOx, Sn, SnOx, Ge, GeOx, Pb, PbOx, Ag, Mg, Zn, ZnOx, Ga, In, Sb and Bi. 24. An anode of a lithium battery comprising a metal current collector and the anode active material of claim 20 coated on the current collector. 25. A lithium battery including a cathode, an anode and an electrolyte solution, the anode comprising a metal current collector and the anode active material of claim 20 coated on the metal current collector.
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