Novel Synthesis of Anhydrous and Hydroxylated CuF<sub>2</sub>Nanoparticles and Their Potential for Lithium Ion Batteries
作者:Thoralf Krahl、Friederike Marroquin Winkelmann、Andréa Martin、Nicola Pinna、Erhard Kemnitz
DOI:10.1002/chem.201800207
日期:2018.5.17
Anhydrous nanoscopic CuF2 is synthesized from alkoxides Cu(OR)2 (R=Me, tBu) by their reaction either in pure liquid HF at −70 °C, or under solvothermal conditions at 150 °C using excess HF and THF as solvent. Depending on the synthesis method, nanoparticles of sizes between 10 and 100 nm are obtained. The compound is highly hygroscopic and forms different hydrolysis products under moist air, namely
无水纳米CuF 2是由醇盐Cu(OR)2(R = Me,t Bu)通过在纯液态HF中于-70°C或在溶剂热条件下于150°C使用过量的HF和THF作为溶剂的反应合成的。取决于合成方法,获得尺寸在10至100nm之间的纳米颗粒。所述化合物是高度吸湿的,并在潮湿的空气中形成不同的水解产物,即CUF 2 ⋅ 2小时2 O,的Cu 2(OH)的F 3和Cu(OH)F,其中只有后者在室温下是稳定的。铜2与半电池锂离子电池中的锂相比,当循环时,锂在〜2.7 V的电势下表现出电化学平稳期,这归因于不可逆转换机制。在第一个循环中,电池容量取决于颗粒大小,≈8nm的微晶直径为468 mAh g -1,≈12nm的微晶直径为353 mAh g -1,称为CuF 2。然而,如此高的容量不能维持几个周期,并且容量迅速消失。电池电压降低至≈2.0V代表CUF 2 ⋅ 2小时2 O,的Cu 2(OH)的F 3和Cu(