Si/C composite, anode active materials, and lithium battery including the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01M-004/80
H01M-004/13
H01M-004/60
H01M-004/58
B32B-009/04
B32B-013/04
B32B-009/00
B32B-019/00
B05D-007/00
출원번호
US-0118972
(2008-05-12)
등록번호
US-8263265
(2012-09-11)
우선권정보
KR-10-2007-75911 (2007-07-27)
발명자
/ 주소
Mah, Sang-kook
Kim, Han-su
출원인 / 주소
Samsung SDI Co., Ltd.
대리인 / 주소
Lee & Morse, P.C.
인용정보
피인용 횟수 :
4인용 특허 :
2
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▼
1. An Si/C composite comprising: porous silicon (Si) particles, the porous silicon particles having pores, andcarbon embedded within the porous silicon particles, the carbon being crystalline or amorphous carbon. 2. The Si/C composite of claim 1, wherein the amount of carbon in the Si/C composite ra
1. An Si/C composite comprising: porous silicon (Si) particles, the porous silicon particles having pores, andcarbon embedded within the porous silicon particles, the carbon being crystalline or amorphous carbon. 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 porous silicon particles have a diameter in a range from about 0.01 to about 100 μm. 4. The Si/C composite of claim 1, further comprising carbon on an outer shell of the porous silicon particles. 5. The Si/C composite of claim 1, wherein the carbon embedded within the porous silicon particles includes silicon carbide (SiC) at an outer surface of the carbon. 6. An anode active material comprising the Si/C composite of claim 1. 7. The anode active material of claim 6, further comprising carbon on the outer shell of the porous silicon particles. 8. The anode active material of claim 6, further comprising a material that can be alloyed with lithium. 9. The anode active material of claim 8, 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. 10. An anode of a lithium battery comprising a metal current collector and the anode active material of claim 6 coated on the current collector. 11. 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 6 coated on the metal current collector. 12. A method for preparing an Si/C composite, comprising: mixing an alkali metal or an alkali earth metal with a silica/C composite, the silica/C composite including crystalline carbon or amorphous carbon, 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 form an oxide of the alkali metal or alkali earth metal; andtreating the resultant product of the heat treatment with acid to remove the oxide of the alkali metal or alkali earth metal to provide an Si/C composite including porous silicon (Si) particles, the porous silicon particles having pores, and the crystalline or amorphous carbon embedded within the porous silicon particles. 13. The method of claim 12, wherein the silica/C composite is obtained by mixing silicon oxide and carbon. 14. The method of claim 13, wherein the silicon oxide is at least one selected from the group consisting of SiO, SiO2, silica gel, glass, quartz, and zeolite. 15. The method of claim 13, wherein the carbon is at least one selected from the group consisting of natural graphite, artificial graphite, carbon particles, and carbon nanotubes. 16. The method of claim 12, 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. 17. The method of claim 16, wherein the silicon oxide precursor is a silicon alkoxide or silicon halide. 18. The method of claim 16, wherein the carbon precursor is pitch or a hydrocarbon-based material. 19. The method of claim 16, 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. 20. The method of claim 12, further comprising coating the product of the heat treatment with carbon. 21. The method of claim 12, wherein the alkali metal is lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), or francium (Fr). 22. The method of claim 12, wherein the alkaline earth metal is beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), or radium (Ra). 23. The method of claim 12, 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. 24. An Si/C composite formed by a process comprising: mixing an alkali metal or an alkali earth metal with a silica/C composite, the silica/C composite including crystalline carbon or amorphous carbon, 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 form an oxide of the alkali metal or alkali earth metal; andtreating the resultant product of the heat treatment with acid to remove the oxide of the alkali metal or alkali earth metal, thereby forming the Si/C composite, the Si/C composite including porous silicon (Si) particles, the porous silicon particles having pores, and the crystalline or amorphous carbon embedded within the porous silicon particles.
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이 특허에 인용된 특허 (2)
Umeno, Tatsuo; Fukuda, Kenji; Tsunawaki, Tadanori; Hara, Youichiro, Composite material for anode of lithium secondary battery, and lithium secondary battery.
Bellman, Robert A.; Borrelli, Nicholas F.; Deneka, David A.; O'Malley, Shawn M.; Schneider, Vitor M., Dimensional silica-based porous silicon structures and methods of fabrication.
Laicer, Castro; Rasimick, Brian; Harrison, Kate; McDonald, Robert, Three-dimensional, porous anode for use in lithium-ion batteries and method of fabrication thereof.
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