US 11,742,473 B2
Reduced graphene oxide-silicon metal particle complex, complex manufacturing method, and secondary battery electrode comprising complex
Seung Yol Jeong, Changwon-si (KR); Geon Woong Lee, Changwon-si (KR); Jong Hwan Park, Gimhae-si (KR); Sun Hye Yang, Changwon-si (KR); Soo Yeon Jeong, Busan (KR); Ick Jun Kim, Busan (KR); Seon Hee Seo, Changwon-si (KR); Hye Jung Lee, Changwon-si (KR); Hee Jin Jeong, Changwon-si (KR); and Joong Tark Han, Changwon-si (KR)
Assigned to Korea Electrotechnology Research Institute
Filed by KOREA ELECTROTECHNOLOGY RESEARCH INSTITUTE, Changwon-si (KR)
Filed on Jun. 3, 2020, as Appl. No. 16/891,179.
Application 16/891,179 is a continuation of application No. PCT/KR2018/013677, filed on Nov. 12, 2018.
Claims priority of application No. 10-2017-0165221 (KR), filed on Dec. 4, 2017.
Prior Publication US 2020/0295344 A1, Sep. 17, 2020
Int. Cl. H01M 4/04 (2006.01); C01B 32/198 (2017.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 4/583 (2010.01)
CPC H01M 4/04 (2013.01) [C01B 32/198 (2017.08); H01M 4/364 (2013.01); H01M 4/386 (2013.01); H01M 4/583 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of manufacturing a reduced-graphene-oxide/silicon-metal-particle composite, comprising:
preparing a reduced-graphene-oxide dispersion solution by reducing graphene oxide formed through cation-pi interaction and mixing the reduced-graphene-oxide dispersion solution with a water-soluble polymer and silicon metal particles to form a first reduced-graphene-oxide/silicon-metal-particle dispersion solution;
preparing a second reduced-graphene-oxide/silicon-metal-particle dispersion solution comprising reduced graphene oxide having sizes in a range that is different from a sizes range of the reduced graphene oxide in the first reduced-graphene-oxide/silicon-metal-particle dispersion solution; and
spray drying the first reduced-graphene-oxide/silicon-metal-particle dispersion solution followed by spray drying the second reduced-graphene-oxide/silicon-metal-particle dispersion solution so that the silicon metal particles are surrounded by the reduced graphene oxide to manufacture a composite powder having a core-shell structure in which a surface of the silicon metal particles is surrounded by reduced graphene oxide, such that the silicone metal particles are present inside as a core and the reduced graphene oxide is formed as an outer shell of the core-shell structure,
wherein the water-soluble polymer is selected from the group consisting of polyvinyl alcohol, polyethyleneimine, polyamideamine, polyvinyl formamide, polyvinyl acetate, polyacrylamide, polyvinylpyrrolidone, polydiallyldimethylammonium chloride, polyethylene oxide, polyacrylic acid, polystyrene sulfonic acid, polysilicic acid, polyphosphoric acid, polyethylene sulfonic acid, poly-3-vinyloxypropane-1-sulfonic acid, poly-4-vinylphenol, poly-4-vinylphenyl sulfonic acid, polyethylene phosphoric acid, polymaleic acid, poly-4-vinylbenzoic acid, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose, polysaccharide, starch and mixtures thereof.