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  • 09월 05일 23시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제128회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Exploration of cathode materials for emerging calcium-ion batteries

2021년 9월 4일 22시 33분 34초
MAT2-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 10시 : 10분
Material Chemistry - Advanced Electrode Materials for Next-generation Batteries
저자 및
Seung-Tae Hong
Energy Science and Engineering, DGIST (Daegu Gyeongbuk Institute of Science and Technology), Korea
Calcium-ion batteries (CIBs) represent a promising alternative to the current lithium-ion batteries. Environmental friendliness, reliability, safety, and plentiful sources could be typical advantages of calcium over lithium. Calcium ions can transfer two electrons per ion. Thus, in principle, the capacity of a host material can double due to the divalency of calcium, provided the host material can release and accept the transferred electrons. The redox potential of calcium is close to that of lithium, enabling a high cell voltage. The larger ionic radius of calcium (1.0 Å) compared to those of other divalent ions (0.60–0.74 Å) could be advantageous for the diffusion in the host materials and the electrolytes due to the lower effective intercalant-ion charge density. Recent discoveries of reversible plating or alloying of calcium provoked considerable interest in calcium-based rechargeable batteries. Theoretical calculations also anticipate the development of positive materials. Nonetheless, only a few cathode materials have been reported so far, only to exhibit low energy-storage capability and poor cyclability. In this talk, the synthesis, structural and electrochemical properties of new cathode materials for nonaqueous CIBs will be presented, which were recently developed in our group. Some examples include NASICON-type NaV2(PO4)3, FeV3O9∙1.2H2O, Ca0.13MoO3·(H2O)0.41, K0.5V2O5, and Ag0.33V2O5. These stimulating discoveries will lead to the development of new strategies for obtaining high energy density CIBs beyond LIBs.