苏州大学张伟团队报道了基于多用途过氧化氢路线的动力学控制涂层方法，构建均匀碱金属快速离子导体纳米壳。相关研究成果于2024年10月9日发表在知名学术期刊《美国化学会杂志》。

构建均匀的含碱金属快离子导体涂层对于实现多功能响应和功能至关重要。然而，由于碱金属和过渡金属离子反应性的显著差异，它们不受控制的共沉淀，对追求用于快速离子导体的均匀和连续的纳米壳构成了重大挑战。

该文中，研究人员报告了一种基于过氧化物的多功能动力学控制涂层方法，用于使用LiNbO₃作为概念验证来构建含碱金属的快离子导体。过氧化氢（H₂O₂）被用作一种创新的沉淀剂，通过调节溶液的pH值精确地调节沉积动力学，以促进过渡金属和铵/氢离子的共沉淀。

后者随后可以与锂离子交换，并在低温退火（280°C）后转化为均匀的LiNbO₃纳米壳。所获得的LiNbO₃涂层是连续的、厚度可调的，并且表现出明显更高的离子电导率，比传统涂层高2个数量级。这种增强使固态电池具有优异的循环和倍率性能。

此外，该方法可扩展到各种碱金属基（Li、Na和K）快离子导体纳米壳，为快离子导体在各种电池系统中的先进应用注入了新的活力。

附：英文原文

Title: Versatile Peroxide Route-Based Kinetics-Controlled Coating Method to Construct Uniform Alkali Metal-Containing Fast Ionic Conductor Nanoshells

Author: Pan Mei, Yuan Zhang, Bing Ai, Luxi Hong, Chenhuan Zhou, Wei Zhang

Issue&Volume: October 9, 2024

Abstract: Constructing a uniform coating of alkali metal-containing fast ionic conductors is crucial for realizing multifunctional responses and functionalities. However, the uncontrolled coprecipitation of alkali and transition metal ions, stemming from their significant difference in reactivity, poses a significant challenge in pursuing homogeneous and continuous nanoshells for fast ionic conductors. Here, we report a versatile peroxide-based kinetics-controlled coating approach for constructing alkali metal-containing fast ionic conductors using LiNbO3 as a proof-of-concept. Hydrogen peroxide (H2O2) was employed as an innovative precipitant, and the deposition kinetics could be precisely tuned by adjusting the pH value of the solution to facilitate the coprecipitation of the transition metal and ammonium/hydrogen ions. The latter could subsequently be exchanged with lithium ions and transformed into uniform LiNbO3 nanoshells after low-temperature annealing (280 °C). The obtained LiNbO3 coating layers are continuous, thickness-tunable, and exhibit significantly higher ionic conductivity, 2 orders of magnitude greater than conventional counterparts. This enhancement enables solid-state batteries with excellent cycling and rate performance. Furthermore, this method is extendable to various alkali metal-based (Li, Na, and K) fast ionic conductor nanoshells, injecting new vitality into the advanced applications of fast ionic conductors in various battery systems.

DOI: 10.1021/jacs.4c04519

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c04519