Synthesis, Characterization, and Electrochemical Investigation of Li[O2P(OCH2CF3)(2)] and Li[O2P{OC(H)(CF3)(2)}(2)] and Use of the Former for Coordination-Polymer-Based Gel Electrolytes

The synthesis and characterization of Li[O2P{OCH(CF3)(2)}(2)] (1) was investigated together with a new synthesis for Li[O2P(OCH2CF3)(2)] (2). The electrochemical properties of both lithium bis(fluoroalkyl) phosphates were investigated. Compound 2 was prepared by deprotonation of the conjugate acid HO(O)P(OCH2CF3)(2) (3), of which the crystal structure was solved. Lithium bis(fluoroalkyl) phosphates 1 and 2 were used to prepare gel electrolytes on the basis of a coordination network held together solely by ionic interactions between the lithium ions and the anions. The preparation of the gel electrolytes produced with 2 and their properties were explored.