Copper vanadate as promising high voltage cathodes for Li thermal batteries

摘要

In this original work, series of the CuO-V_2O_5 oxides, such as CuV_2O_6, Cu_2V_2O_7 and Cu_5V_2O_(10) have been synthesized and evaluated as possible candidate cathode materials in high voltage Li thermal batteries. The structure and morphology have been determined and the electrochemical properties at room temperature and elevated temperatures (525 ℃) against Li metal alloy have been investigated. At room temperature, an increase in copper content in the vanadate has been found to provoke a gradual negative shift of the operating voltage plateau vs. Li metal. Room temperature discharge capacity in a Li cell is relatively high and can exceed 350 mAhgr~(-1). In a thermal Li cell configuration and at an elevated temperature a voltage plateau of 3.4 V at a current load of 100 mA g~(-1) was achieved and a voltage plateau of 2.5 V was recorded with a current load of as high as 310 mA g~(-1). Thus, copper-vanadate materials may be regarded as promising short time - high voltage cathodes for thermal Li batteries.