期刊
ELECTROCHIMICA ACTA
卷 45, 期 10, 页码 1655-1661出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0013-4686(99)00389-8
关键词
fluorine intercalation; graphite; C-F bond; primary lithium battery; electrochemical discharge
Highly fluorinated graphites have been synthesized by using elemental fluorine under pressure and high oxidation state complex fluoride, K2NiF6 or KAgF4 in anhydrous hydrogen fluoride. Their electrochemical discharge as a cathode of primary lithium battery has been investigated in organic electrolyte solution. Main products were stage 1 compounds or the stage 1 involving stage 2 and 3 phases as minor components with approximate compositions of C1.6F. X-ray photoelectron spectra indicated the existence of nearly semi-ionic C-F bonds. Electrochemical studies demonstrated that the CxF samples prepared using KAgF4 and elemental fluorine exhibited high and flat discharge potentials of 3.2 V versus Li/Li+ and discharge capacities of similar to 500 mA h g(-1) at cut-off potential 1.5 V. (C) 2000 Elsevier Science Ltd. All rights reserved.
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