A seawater battery with desalination capabilities enabling a dual-purpose aqueous energy storage system
A seawater battery with desalination capabilities enabling a dual-purpose aqueous energy storage system
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DOI：
10.1016/j.ensm.2021.02.037
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发表时间：
2021-03-03
影响因子：
20.4
通讯作者：
Choi, Kyoung-Shin
中科院分区：
文献类型：
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作者：
Nam, Do-Hwan;Lumley, Margaret A.;Choi, Kyoung-Shin
有效储存可再生能源产生的电力以及增加淡水供应并减少碳足迹是可持续、可靠地提供电力和清洁水的两个紧迫问题。在这项研究中，开发了一种新型水性可充电钠离子电池系统，该系统可以在海水中运行时存储/释放能量，还可以进行无膜海水淡化，从而实现双用途储能系统（ESS）。该系统的放电电池由0.6 M NaCl中的钠化NaTi2(PO4)(3)电极和脱钠六氰基铁酸镍(NiHCF)电极组成，产生1.19 V的平均输出电压。充电过程是在两个需要低输入电压的独立电池中实现的。首先，脱钠的NaTi2(PO4)(3)电极与Bi配对作为Cl存储电极，该电池在充电过程中进行脱盐。在第二种情况下，钠化 NiHCF 电极与氯化 Bi 电极配对，该电池在充电过程中进行盐化。放电电池产生的能量输出相当于两个充电电池所需的组合能量输入的 94%。由于海水淡化和盐化过程消耗的能量并不是真正消耗掉，而是通过充电过程存储在系统中，并且充电过程中存储的大部分能量在放电过程中被回收，因此海水淡化消耗的额外能量被最小化。据报道，概念验证的两用 ESS 具有高能效和海水淡化性能，所有组件电极均具有出色的循环能力（> 1000 次循环）。
Effectively storing electricity produced from renewable sources and increasing the supply of fresh water with a reduced carbon footprint are two pressing issues to sustainably and reliably provide electricity and clean water. In this study, a new aqueous rechargeable Na-ion battery system, which can store/release energy while operating in seawater and can also perform membrane-free seawater desalination, is developed enabling a dual-purpose energy storage system (ESS). The discharging cell of this system is composed of a sodiated NaTi2(PO4)(3) electrode and a desodiated nickel hexacyanoferrate (NiHCF) electrode in 0.6 M NaCl, and generates an average output voltage of 1.19 V. The charging process is achieved in two separate cells that require low input voltages. In the first, a desodiated NaTi2(PO4)(3) electrode is paired with Bi as a Cl-storage electrode, and this cell performs desalination during charging. In the second, a sodiated NiHCF electrode is paired with a chlorinated Bi electrode, and this cell performs salination during charging. The energy output generated by the discharging cell is similar to 94% of the combined energy inputs required by the two charging cells. As the energy consumed for the desalination and salination processes is not truly consumed but rather stored in the system through the charging process, and the majority of the energy stored during charging is recovered during discharging, the extra energy consumed for desalination is minimized. The high energy efficiency and desalination performance of the proof-of-concept dual-purpose ESS are reported with excellent cyclabilities of all component electrodes (> 1000 cycles).