Sodium rechargeable batteries can be excellent alternatives to replace lithium rechargeable ones because of the high abundance and low cost of sodium; however, there is a need to further improve the battery performance, cost-effectiveness, and safety for practical use. Here we demonstrate a new type of room-temperature and high-energy density sodium rechargeable battery using an SO2-based inorganic molten complex catholyte, which showed a discharge capacity of 153 mAh g>−1 based on the mass of catholyte and carbon electrode with an operating voltage of 3 V, good rate capability and excellent cycle performance over 300 cycles. In particular, non-flammability and intrinsic self-regeneration mechanism of the inorganic liquid electrolyte presented here can accelerate the realization of commercialized Na rechargeable battery system with outstanding reliability. Given that high performance and unique properties of Na–SO2 rechargeable battery, it can be another promising candidate for next generation energy storage system.
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机译：钠可充电电池可以替代锂可充电电池，因为钠含量高且价格低廉，因此可以替代锂可充电电池。然而，需要进一步提高电池性能，成本效益和实用性。在这里，我们演示了一种新型的室温高能量密度钠二次电池，该电池使用了基于SO2的无机熔融复合阴极电解液，其放电容量为153 mAh g >- 1 < / sup>基于阴极电解液和碳电极的质量，工作电压为3 V，良好的倍率能力和超过300次循环的出色循环性能。特别地，本文提出的无机液体电解质的不易燃性和固有的自我再生机理可以加速具有优异可靠性的商品化Na可再充电电池系统的实现。鉴于Na-SO2可充电电池的高性能和独特性能，它可以成为下一代储能系统的另一有希望的候选者。
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