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Thermodynamically and Physically Stable Dendrite-Free Li Interface with Layered Boron Nitride Separators
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-03-02 , DOI: 10.1021/acssuschemeng.1c00040 John Hong 1, 2 , A-Rang Jang 3 , Woon Bae Park 4 , Bo Hou 5 , Jeong-O Lee 6 , Kee-Sun Sohn 7 , SeungNam Cha 8 , Young-Woo Lee 9 , Jung Inn Sohn 10
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-03-02 , DOI: 10.1021/acssuschemeng.1c00040 John Hong 1, 2 , A-Rang Jang 3 , Woon Bae Park 4 , Bo Hou 5 , Jeong-O Lee 6 , Kee-Sun Sohn 7 , SeungNam Cha 8 , Young-Woo Lee 9 , Jung Inn Sohn 10
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The development of promising separator candidates, offering both great physical rigidity and high thermal resistance, is still a global challenge to guarantee high-performance electrochemical cells. Freestanding hexagonal boron nitride (h-BN) separators are developed using strategically combined synthetic steps with liquid and thermal expansion exfoliation methods, which can simply fabricate the largely yielded h-BN nanosheets. The as-prepared freestanding h-BN nanosheet separator presents better ionic conductivity than commercial polymer separators and further provides excellent stability of Li ion cells by suppressing the protruding dendritic Li growth during cycles on the electrodes, as well as the high thermal and electrochemical stabilities of h-BN nanosheet separators even after the aging process at high temperatures of 80–120 °C. Furthermore, lithium titanate (LTO) batteries with the freestanding h-BN separators maintain an outstanding reversible Coulombic efficiency of ∼99% after 600 cycles, as well as high cycling retention, indicating the significant improvement in battery performance compared to the LTO batteries with commercial polymer separators. Thus, the freestanding h-BN separators may provide a new strategic way for the efficient storage of charge in next-generation rechargeable batteries and high-safety energy storage applications.
中文翻译：
具有层状氮化硼分离器的热力学和物理稳定的无枝晶锂界面
具有良好的物理刚性和高耐热性的有前途的隔板候选物的开发仍然是保证高性能电化学电池的全球性挑战。独立式六方氮化硼（h-BN）分离器是通过战略性地将合成步骤与液体和热膨胀剥落方法相结合而开发的，可以简单地制造出大量生产的h-BN纳米片。所制备的独立式h-BN纳米片状隔膜具有比市售聚合物隔膜更好的离子电导率，并且通过抑制电极循环过程中突出的树枝状Li的生长以及锂的高热稳定性和电化学稳定性，进一步提供了Li离子电池的出色稳定性。即使在80–120°C的高温下老化后，h-BN纳米片隔膜也是如此。此外，具有独立式h-BN隔膜的钛酸锂（LTO）电池在600次循环后仍具有出色的可逆库仑效率，约为99％，并且循环保持率高，这表明与商用LTO电池相比，电池性能有了显着改善。聚合物隔板。因此，独立的h-BN隔板可为下一代可充电电池和高安全性储能应用中的电荷有效存储提供新的战略途径。
更新日期：2021-03-22
中文翻译：
具有层状氮化硼分离器的热力学和物理稳定的无枝晶锂界面
具有良好的物理刚性和高耐热性的有前途的隔板候选物的开发仍然是保证高性能电化学电池的全球性挑战。独立式六方氮化硼（h-BN）分离器是通过战略性地将合成步骤与液体和热膨胀剥落方法相结合而开发的，可以简单地制造出大量生产的h-BN纳米片。所制备的独立式h-BN纳米片状隔膜具有比市售聚合物隔膜更好的离子电导率，并且通过抑制电极循环过程中突出的树枝状Li的生长以及锂的高热稳定性和电化学稳定性，进一步提供了Li离子电池的出色稳定性。即使在80–120°C的高温下老化后，h-BN纳米片隔膜也是如此。此外，具有独立式h-BN隔膜的钛酸锂（LTO）电池在600次循环后仍具有出色的可逆库仑效率，约为99％，并且循环保持率高，这表明与商用LTO电池相比，电池性能有了显着改善。聚合物隔板。因此，独立的h-BN隔板可为下一代可充电电池和高安全性储能应用中的电荷有效存储提供新的战略途径。
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