| 초록 |
With emerging safety issue of conventional lithium-ion battery, the demands for safe and stable battery systems are increasing consequently. On this account, various aqueous battery systems have been devised including zinc-ion battery, sodium-ion battery and so on. Among them, seawater battery is considered as promising next-generation battery owing to its innocuousness and inexhaustible resource. Herein, we investigated the intercalation-based cathode material for seawater battery. Thanks to its large interstitial site and structural stability in seawater, nickel hexacyanoferrate (NiHCF) is suitable material for (de)intercalation of sodium-ion. However, the structural defects of NiHCF can be formed during rapid synthetic process, which are considered as the major degradation factors for electrochemical operation. Thus, we introduced chelating agent to slow down the reaction kinetics so the structure of NiHCF can be assembled well. With various analysis method, the morphological and electrochemical properties of NiHCF are analyzed. In addition, through full-cell test, we verified the applicability and superiority of structure-controlled NiHCF in seawater battery system. |
