Department of Materials Science and Nano Engineering, Rice University , Houston, Texas 77005, United States.
Department of Mechanical Engineering, Wayne State University , Detroit, Michigan 48202, United States.
ACS Appl Mater Interfaces. 2015 Nov 25;7(46):25777-83. doi: 10.1021/acsami.5b07636. Epub 2015 Nov 11.
Rechargeable batteries capable of operating at high temperatures have significant use in various targeted applications. Expanding the thermal stability of current lithium ion batteries requires replacing the electrolyte and separators with stable alternatives. Since solid-state electrolytes do not have a good electrode interface, we report here the development of a new class of quasi-solid-state electrolytes, which have the structural stability of a solid and the wettability of a liquid. Microflakes of clay particles drenched in a solution of lithiated room temperature ionic liquid forming a quasi-solid system has been demonstrated to have structural stability until 355 °C. With an ionic conductivity of ∼3.35 mS cm(-1), the composite electrolyte has been shown to deliver stable electrochemical performance at 120 °C, and a rechargeable lithium battery with Li4Ti5O12 electrode has been tested to deliver reliable capacity for over several cycles of charge-discharge.
可在高温下工作的充电电池在各种有针对性的应用中有重要用途。要扩大现有锂离子电池的热稳定性，需要用稳定的替代品替代电解质和隔膜。由于固态电解质没有良好的电极界面，我们在这里报告了一类新型准固态电解质的开发，这种电解质具有固体的结构稳定性和液体的润湿性。浸润在溶有锂离子的室温离子液体中的粘土颗粒薄片形成准固态体系，其结构稳定性一直保持到 355°C。这种复合电解质的离子电导率约为 3.35 mS cm(-1)，在 120°C 下表现出稳定的电化学性能，用 Li4Ti5O12 电极的可充电锂电池进行了测试，其充放电循环的可靠容量超过几个周期。
