具有可控多晶型物和形态的 MnO2 的高效可扩展水热合成用于增强型电池阴极,ACS Energy Letters

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具有可控多晶型物和形态的 MnO2 的高效可扩展水热合成用于增强型电池阴极
ACS Energy Letters ( IF 19.3 ) Pub Date : 2023-03-13 , DOI: 10.1021/acsenergylett.3c00018
Shifeng Hong ₁ , Shuo Jin ₂ , Yue Deng ₁ , Regina Garcia-Mendez ₂ , Keun-il Kim ₂ , Nyalaliska Utomo ₂ , Lynden A. Archer _{1,

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Affiliation

MnO ₂是一种多功能、经济高效的过渡金属氧化物，引起了多个领域的兴趣，包括作为活性阴极材料或用于电池电化学储能的催化剂。水热法是最有效的 MnO ₂合成方法之一。这些方法能够轻松、灵活地生产任何晶相（α、β、δ 等）的MnO _{2 ，主要产物由前体浓度和温度等反应条件决定。}不幸的是，这些好处伴随着不切实际的低产率 (~9%) 和长反应时间。在这里，我们报告低分子量水溶性聚合物可作为水热合成 MnO 的有效成核剂₂ . 出于根本原因，据报道这些聚合物还可以促进反应速率和产率的大幅提高（10 到 40 倍）。我们评估了合成的 MnO ₂的物理和晶体学特征，发现根据反应条件，聚合物辅助合成主要产生 δ-MnO ₂或 β-MnO ₂。所制备的具有额外层间水的 δ-MnO ₂材料作为水性锌离子电池应用的电极进行了研究，并显示其支持中等和高倍率下的长期储存。

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Efficient Scalable Hydrothermal Synthesis of MnO2 with Controlled Polymorphs and Morphologies for Enhanced Battery Cathodes

MnO₂ is a versatile, cost-effective transition metal oxide that has attracted interest in multiple domains, including as an active cathode material or catalyst for electrochemical energy storage in batteries. Hydrothermal methods are among the most efficient approaches for MnO₂ synthesis. These approaches enable facile, versatile production of MnO₂ in any of its crystalline phases (α, β, δ, etc.), with the dominant product being determined by reaction conditions such as precursor concentration and temperature. These benefits unfortunately come with impractically low product yields (∼9%) and long reaction times. Here, we report that low-molecular weight, water-soluble polymers function as effective nucleating agents for the hydrothermal synthesis of MnO₂. For fundamental reasons, these polymers are also reported to promote large (10- to 40-fold) increases in reaction rate and yield. We evaluate the physical and crystallographic features of the synthesized MnO₂ and find that depending upon the reaction conditions, the polymer-assisted synthesis yields dominantly δ-MnO₂ or β-MnO₂. The as-prepared δ-MnO₂ materials with extra interlayer water are studied as electrodes for aqueous Zn-ion battery applications and are shown to support long-duration storage at both moderate and high rates.

更新日期：2023-03-13

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