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首页> 外文期刊>Advanced Functional Materials >Ion-Conductive, Viscosity-Tunable Hexagonal Boron Nitride Nanosheet Inks
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Ion-Conductive, Viscosity-Tunable Hexagonal Boron Nitride Nanosheet Inks

机译：离子导电，可调节粘度的六方氮化硼纳米片油墨

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Liquid-phase exfoliation of layered solids holds promise for the scalable production of 2D nanosheets. When combined with suitable solvents and stabilizing polymers, the rheology of the resulting nanosheet dispersions can be tuned for a variety of additive manufacturing methods. While significant progress is made in the development of electrically conductive nanosheet inks, minimal effort is applied to ion-conductive nanosheet inks despite their central role in energy storage applications. Here, the formulation of viscosity-tunable hexagonal boron nitride (hBN) inks compatible with a wide range of printing methods that span the spectrum from low-viscosity inkjet printing to high-viscosity blade coating is demonstrated. The inks are prepared by liquid-phase exfoliation with ethyl cellulose as the polymer dispersant and stabilizer. Thermal annealing of the printed structures volatilizes the polymer, resulting in a porous microstructure and the formation of a nanoscale carbonaceous coating on the hBN nanosheets, which promotes high wettability to battery electrolytes. The final result is a printed hBN nanosheet film that possesses high ionic conductivity, chemical and thermal stability, and electrically insulating character, which are ideal characteristics for printable battery components such as separators. Indeed, lithium-ion battery cells based on printed hBN separators reveal enhanced electrochemical performance that exceeds commercial polymer separators.
机译：分层固体的液相剥落为2D纳米片的可扩展生产提供了希望。当与合适的溶剂和稳定化的聚合物结合使用时，可以针对各种增材制造方法调整所得纳米片分散液的流变性。尽管在导电纳米片油墨的开发方面取得了重大进展，但尽管离子导电纳米片油墨在储能应用中发挥了重要作用，但仍将最小的努力应用于离子导电纳米片油墨。在此，说明了粘度可调六方氮化硼（hBN）油墨的配方，该油墨与从低粘度喷墨印刷到高粘度刮刀涂层的光谱范围广泛的各种印刷方法兼容。通过用乙基纤维素作为聚合物分散剂和稳定剂进行液相剥离来制备油墨。印刷结构的热退火会使聚合物挥发，从而导致多孔微结构，并在hBN纳米片上形成纳米级碳质涂层，从而促进了对电池电解质的高润湿性。最终结果是印刷的hBN纳米片薄膜，该薄膜具有高离子电导率，化学和热稳定性以及电绝缘特性，这是可印刷电池组件（例如隔板）的理想特性。确实，基于印刷hBN隔膜的锂离子电池具有比商用聚合物隔膜更高的电化学性能。

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