Zhou Weishan, Zheng Yiran, Zartashia Mahrab, Shan Yan, Noor Hadia, Lou Hongtao, Hou Xianhua
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Guangdong Engineering Technology Research Center of Efficient Green Energy and Environment Protection Materials, School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China.
School of Foreign Languages, Guangdong Pharmaceutical University, Guangzhou 510006, China.
ACS Appl Mater Interfaces. 2022 Aug 3;14(30):34835-34843. doi: 10.1021/acsami.2c06304. Epub 2022 Jul 23.
Sodium-ion batteries (SIBs) are regarded as one of the most promising candidates for next-generation energy storage devices and have been gradually grasping market share for their low cost and similar reaction mechanism and production process as compared to lithium-ion batteries. However, the low energy density of SIBs restricts their practical applications. For example, regular full cells of a Prussian blue cathode and NASICON anode have only a low discharge capacity (about 77 mA h/g at 1 C). Taking into account the compatibility of the electrolyte and electrode materials, a novel strategy for a viable aqueous dual-electrolyte sodium-ion battery (ADESIB) has been proposed using NaSO solution as the anolyte and redox-active sodium hexacyanoferrate NaFe(CN) solution as the catholyte to accommodate a NASICON NaTi(PO) anode and Prussian blue NaNiFe(CN) cathode. The capacity of Na ion deinsertion/insertion electrodes combined with the redox chemistry of the NaFe(CN) catholyte thus enhances overall charge storage and energy density. The ADESIB delivers a capacity of about 113 mA h/g at 1 C, showing a 43% improvement over batteries with a regular single NaSO electrolyte. Additionally, the dual-electrolyte full-cell system is proved to reach a 84.7% capacity retention after 1000 cycles, mainly due to the synergy of the electrolytes in both sides. This pioneering research proposes an aqueous dual-electrolyte sodium-ion full cell, showing potential applications in a new sodium-ion full battery system.
钠离子电池（SIBs）被视为下一代储能设备最有前景的候选者之一，并且由于其低成本以及与锂离子电池相似的反应机理和生产工艺，正逐渐占据市场份额。然而，钠离子电池的低能量密度限制了它们的实际应用。例如，普鲁士蓝阴极和NASICON阳极的常规全电池仅具有较低的放电容量（在1 C时约为77 mA h/g）。考虑到电解质与电极材料的兼容性，已提出一种用于可行的水性双电解质钠离子电池（ADESIB）的新策略，使用NaSO溶液作为阳极电解液，氧化还原活性的六氰合铁酸钠NaFe(CN)溶液作为阴极电解液，以适配NASICON NaTi(PO)阳极和普鲁士蓝NaNiFe(CN)阴极。与NaFe(CN)阴极电解液的氧化还原化学相结合的Na离子脱嵌/嵌入电极的容量，从而提高了整体电荷存储和能量密度。ADESIB在1 C时的容量约为113 mA h/g，比使用常规单一NaSO电解质的电池提高了43%。此外，双电解质全电池系统被证明在1000次循环后容量保持率达到84.7%，这主要归因于两侧电解质的协同作用。这项开创性的研究提出了一种水性双电解质钠离子全电池，在新型钠离子全电池系统中显示出潜在的应用前景。
