Structural Investigation of NaCrO2 as a Positive Electrode for Rechargeable Sodium Battery Using Molten NaFSA-KFSA

Rechargeable sodium battery has emerged as a promising contender for future energy storage devices owing to the abundant nature and cost sensitivity of high-volume markets. Despite the resurgence in interest in Na-ion technology, several fundamental issues of increasing practical importance have not been adequately tackled. One such issue concerns the safety. Recently, we have reported that some alkali metal TFSA (TFSA=bis(trifluoromethylsulfonyl)amide) molten salts are promising electrolytes for lithium [1] and sodium [2] secondary batteries operating around 150 ºC, providing nonflammability and high thermal stability as great safety asset. More recently, we have demonstrated that an eutectic mixture of NaFSA-KFSA (FSA=bis(fluorosulfonyl)amide) is another promisin