报告时间：2018年11月12日上午10:30
报告地点：联合楼a座二楼会议室
making better batteries for sustainable future: principles for rechargeable manganese dioxide/zinc batteries
boeun lee, and, si hyoung oh
centre for energy storage research, korea institute of science and technology
5, hwarangro 14-gil, seoungbuk-gu, seoul, 02792 republic of korea
tel: 82-2-958-5226, fax: 82-2-958-5229
abstract
the accumulation of greenhouse gases in the earth's atmosphere from the burning of fossil fuels for the last several centuries and the depletion of worldwide natural resources has sparkled an ever-increasing need for the development of green energy sources and ways to efficiently consume existent resources. this trend is expected to continue throughout this century, creating huge emerging markets for products such as electric vehicles (evs) and ess to make efficient use of electrical energy. in this point of view, the development of large-scale energy storage systems with a higher energy density and safety at much lower cost than the conventional li-ion batteries will be one of the top priorities in the scientific community to pursue. rechargeable batteries based on inexpensive metal oxide cathode such as mno2, zinc metal anode, and mildly-acidic electrolyte have emerged as one of the most viable options to meet these needs owing to their inexpensive material cost, relatively high volumetric capacity, and intrinsic safety features. extensive research has been carried out recently, e.g., searching for new electrode materials, identifying the reaction mechanisms, and improving the battery performance. we will go over these recent advances, and report our findings on the distinct reaction mechanisms in the aqueous electrolyte containing zinc sulfate salt and make an attempt to identify principal factors to affect the reaction mechanism of the this battery system.
dr. si hyoung oh is currently a principal investigator at the centre for energy storage research in korea institute of science and technology, kist (since 2016) and holds additional post of associate professor at the department of energy and environmental engineering, korea university of science and technology (since 2014). he received his phd in inorganic chemistry at the university of waterloo, canada in 2011 (supervisor: l. f. nazar). since 2003, he has been working in kist. he primarily works on the development of new electrode materials for high-energy, low-cost, environmentally-benign energy storage systems, e.g., meal-air battery, li-sulfur battery, and rechargeable batteries using multivalent metal electrode.
selected publications (*: corresponding author)
1. s. h. oh* et al, strategic combination of grignard reagents and allyl-functionalized ionic liquids as an advanced electrolyte for rechargeable magnesium batteries, j. mater. chem. a, 6 (2018) 3126-3133.
2. s. h. oh* et al., tungsten carbide as a highly efficient catalyst for polysulfide fragmentations in li-s batteries, j. phys. chem. c, 122 (2018) 7664-76669.
3. s. h. oh* et al, nanoscale zirconium-abundant surface layers on lithium-and manganese-rich layered oxides for high-rate lithium-ion batteries, nano lett., 17 (2017) 7869-7877.
4. s. h. oh* et al, a conditioning-free magnesium chloride complex electrolyte for rechargeable magnesium batteries. j. mater. chem. a, (2016).
5. s. h. oh et al, synthesis of a metallic mesoporous pyrochlore as a catalyst for lithium-o2 batteries, nature chemistry 4 (2012) 1004-1010.