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>Dual intercalation of inorganics–organics for synergistically tuning the layer spacing of V2O5·nH2O to boost Zn2+ storage for aqueous zinc-ion batteries
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Dual intercalation of inorganics–organics for synergistically tuning the layer spacing of V2O5·nH2O to boost Zn2+ storage for aqueous zinc-ion batteries
Possessing a 2D zinc-ion transport channel, layered vanadium oxides have become good candidates as cathode materials for aqueous rechargeable zinc-ion batteries (ARZIBs). Tuning the lamellar structure of vanadium oxides to enhance their zinc-ion storage is a great challenge. In the present study, we proposed and investigated a “co-intercalation mechanism” in which Mg2+ and polyaniline (PANI) were simultaneously intercalated into the layers of hydrated V2O5 (MgVOH/PANI) by a one-step hydrothermal method. Inorganic–organic co-intercalation could tune the layer spacing of VOH, and this combination played a synergistic role in enhancing the zinc-ion storage in MgVOH/PANI. It showed an extremely large layer spacing of 14.2 Å, specific capacity of up to 412 mA h g−1 at 0.1 A g−1, and the capacity retention rate could reach 98% after 1000 cycles. PANI itself has a zinc-storage capacity, and Mg2+ intercalated with PANI can improve the conductivity of the material and enhance its stability. Further first-principles calculations clearly revealed the structural changes and improved electrochemical performance of vanadium oxides. This method of inorganic and organic co-regulation of the VOH structure opens a new strategy for tuning the lamellar structure of layered materials to boost their electrochemical performances.
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机译：拥有一个2 d zinc-ion传输通道,分层的钒氧化物成为好候选人作为水的阴极材料可充电电池zinc-ion (ARZIBs)。钒氧化物的层状结构加强zinc-ion存储是一个伟大的挑战。调查“co-intercalation机制”Mg2 +和聚苯胺(PANI)吗同时插入到层水化V2O5一步(MgVOH / PANI)热液的方法。co-intercalation间距可以调整层VOH,这种组合发挥了协同作用在增强zinc-ion存储MgVOH /聚苯胺。间距14.2,具体容量高达412马在0.1 g h g−1−1,和保留的能力1000个周期后率可能达到98%。本身有一个zinc-storage容量和Mg2 +与聚苯胺可以提高插入并提高其导电性的材料稳定。清楚地揭示了结构性变化提高了钒的电化学性能氧化物。打开一个新的co-regulation VOH的结构策略优化的层状结构层状材料来提高其电化学表演。
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