title: A highly resilient mesoporous SiOx lithium storage material engineered by oil-water templating.
abstract: Mesoporous silicon-based materials gained considerable attention as high-capacity lithium-storage materials. However, the practical use is still limited by the complexity and limited number of available synthetic routes. Here, we report carbon-coated porous SiOx as high capacity lithium storage material prepared by using a sol-gel reaction of hydrogen silsesquioxane and oil-water templating. A hydrophobic oil is employed as a pore former inside the SiOx matrix and a precursor for carbon coating on the SiOx . The anode exhibits a high capacity of 730 mAh g(-1) and outstanding cycling performance over 100 cycles without significant dimensional changes. Carbon-coated porous SiOx also showed highly stable thermal reliability comparable to that of graphite. These promising properties come from the mesopores in the SiOx matrix, which ensures reliable operation of lithium storage in SiOx . The scalable sol-gel process presented here can open up a new avenue for the versatile preparation of porous SiOx lithium storage materials.
authors.affiliation: Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 133-791 (Korea).
authors.forename: Eunjun
authors.initials: E
authors.lastname: Park
authors.forename: Min-Sik
authors.initials: MS
authors.lastname: Park
authors.forename: Jaewoo
authors.initials: J
authors.lastname: Lee
authors.forename: Ki Jae
authors.initials: KJ
authors.lastname: Kim
authors.forename: Goojin
authors.initials: G
authors.lastname: Jeong
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Kim
authors.forename: Young-Jun
authors.initials: YJ
authors.lastname: Kim
authors.forename: Hansu
authors.initials: H
authors.lastname: Kim
mesh_terms: D002152:Calorimetry, Differential Scanning; D011211:Electric Power Supplies; D004563:Electrochemistry; D008094:Lithium / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010087:Oxides / Q000737:chemistry*; D016062:Porosity; D033362:Powder Diffraction; D012825:Silicon / Q000737:chemistry*; D013024:Soybean Oil / Q000737:chemistry; D013057:Spectrum Analysis / Q000379:methods; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D010087:Oxides; D014867:Water; D013024:Soybean Oil; D008094:Lithium; D012825:Silicon
keywords: batteries; lithium; porous structure; silicon; silicon oxide