US 12,148,923 B2
Method for preparing silicon by using gas-phase electroreduction
Jihyun Seo, Suwon-si (KR)
Assigned to BEILab corp., Ansan-si (KR)
Appl. No. 18/558,536
Filed by BEILab corp., Ansan-si (KR)
PCT Filed May 30, 2022, PCT No. PCT/KR2022/007666
§ 371(c)(1), (2) Date Nov. 2, 2023,
PCT Pub. No. WO2022/255753, PCT Pub. Date Dec. 8, 2022.
Claims priority of application No. 10-2021-0070006 (KR), filed on May 31, 2021.
Prior Publication US 2024/0243270 A1, Jul. 18, 2024
Int. Cl. H01M 4/38 (2006.01); C01B 33/03 (2006.01); C23C 16/24 (2006.01); C23C 16/44 (2006.01); H01M 4/04 (2006.01); H01M 4/134 (2010.01); H01M 4/1395 (2010.01); H01M 4/36 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01); H01M 4/86 (2006.01)
CPC H01M 4/386 (2013.01) [C01B 33/03 (2013.01); C23C 16/24 (2013.01); C23C 16/4414 (2013.01); H01M 4/0428 (2013.01); H01M 4/134 (2013.01); H01M 4/1395 (2013.01); H01M 4/362 (2013.01); H01M 4/364 (2013.01); H01M 10/0525 (2013.01); C01P 2006/40 (2013.01); H01M 2004/027 (2013.01); H01M 2004/8684 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A silicon preparation method using gas-phase electroreduction, the silicon preparation method comprising:
inserting a base material including a carbon-based negative electrode active material comprising voids into a reactor;
applying an electrical potential to a surface of the base material located in the reactor;
gas-phase supplying a silicon-based compound to the base material having the electric potential applied thereto so that electrons are supplied to the silicon-based compound on the surface of the base material in the reactor; and
forming a silicon coating layer having a thickness in a range of 5 to 100 μm and comprising a plurality of spherical nanoparticles having a diameter in a range of 5 to 100 μm in the form of films or one or more islands on the surface of the base material by using the electrons to reduce the gas-phase silicon-based compound on the surface of the base material and to electrically bond the spherical nanoparticles with the carbon-based material at an interface therebetween to prevent irreversible capacity loss;
wherein the silicon coating layer is formed in a state in which the films and the islands filling the voids are mixed with each other to control distribution of the plurality of nanoparticles so as to be uniform and to achieve attachment to the base material without electrical resistance.
 
4. A lithium-ion/metal battery comprising:
a positive electrode; a negative electrode; and an electrolyte,
wherein the negative electrode comprises the silicon coating layer prepared by the method according to claim 1.