Triple-Function Electrolyte Regulation toward Advanced Aqueous Zn-Ion Batteries
Triple-Function Electrolyte Regulation toward Advanced Aqueous Zn-Ion Batteries
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DOI：
10.1002/adma.202206963
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发表时间：
2022-10-03
影响因子：
29.4
通讯作者：
Qiao, Shi-Zhang
中科院分区：
文献类型：
--
作者：
Hao, Junnan;Yuan, Libei;Qiao, Shi-Zhang
差的Zn可逆性已被批评为限制水性Zn离子电池（ZIB）的应用;然而，其在水性介质中的行为尚未完全揭示。在这里，这个知识的差距是解决，表明锌电极面临的O-2-涉及腐蚀，除了H-2的演变和枝晶生长。与水溶液Li/Na电池不同，去除O-2不能提高ZIB性能，因为加剧了竞争H-2的释放。为了解决锌的问题，报道了通过引入三功能C3 H7 Na 2 O 6P的一次性电解液策略，其可以在电池的货架期期间起作用。它调节H+浓度，降低自由水活性，抑制H-2释放。在电池运行前，可以触发自修复的固体/电解质界面（SEI），其抑制O-2吸附腐蚀和枝晶沉积。因此，在85%的高放电深度下实现了99.6%的高Zn可逆性。具有贫电解质的袋式全电池显示出创纪录的寿命，500次循环后容量保持率为95.5%。这项研究不仅深入研究了锌在水介质中的行为，而且还强调了设计活性金属阳极的规则，包括锌和锂金属，在货架期走向真实的应用。
The poor Zn reversibility has been criticized for limiting applications of aqueous Zn-ion batteries (ZIBs); however, its behavior in aqueous media is not fully uncovered yet. Here, this knowledge gap is addressed, indicating that Zn electrodes face a O-2-involving corrosion, besides H-2 evolution and dendrite growth. Differing from aqueous Li/Na batteries, removing O-2 cannot enhance ZIB performance because of the aggravated competing H-2 evolution. To address Zn issues, a one-off electrolyte strategy is reported by introducing the triple-function C3H7Na2O6P, which can take effects during the shelf time of battery. It regulates H+ concentration and reduces free-water activity, inhibiting H-2 evolution. A self-healing solid/electrolyte interphase (SEI) can be triggered before battery operation, which suppresses O-2 adsorption corrosion and dendritic deposition. Consequently, a high Zn reversibility of 99.6% is achieved under a high discharge depth of 85%. The pouch full-cell with a lean electrolyte displays a record lifespan with capacity retention of 95.5% after 500 cycles. This study not only looks deeply into Zn behavior in aqueous media but also underscores rules for the design of active metal anodes, including Zn and Li metals, during shelf time toward real applications.