123rd General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Exhibition Hall 2
Time 4월 18일 (목요일) 11:00~12:30
Code ELEC.P-454
Subject Incorporating excess lithium into LiMn2O4 via thermally induced grain fining: Promoted lithium-ion diffusion in Li-excess LiMn2O4
Authors Geun Jun Lee, Jin Ho Bang1,*
Bionano Technology, Hanyang University, Korea
1Department of Bionano Technology, Hanyang University, Korea
Abstract LiMn2O4 (LMO) is one of the famous cathode materials for a Lithium-Ion Batteries (LIBs) for its high power, low toxicity and cost. However, because oxidation number of Mn is easily changed, LMO shows a lower capacity and poor stability. Therefore, it is important to solve this problem by controlling the oxidation number of Mn. We suggests a facile method through annealing process in a reducing atmosphere for a high stable LMO. When Mn2O3 is reduced by NH3, it becomes porous Mn3O4 with smaller grain size compared to conventional LMO (C-LMO). These pores contain more lithium inside, which results in Lithium-rich LMO (L-LMO). This L-LMO is highly stable attributed to its excess lithium source. The L-LMO also shows enhanced Li-ion diffuisivity from additional fast dual Li-ion migration channels.
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