【摘要】 研究了添加不同比例的Na2WO4对镍正极高温性能的影响,结果表明,Na2WO4可提高镍氢电池的高温充电效率.70℃条件下,添加1.0%(w)的Na2WO4时镍正极的充电效率达到85%以上.此外,Na2WO4的加入也可提高镍氢电池的放电容量、循环寿命和荷电保持率.研究表明:Na2WO4可以促进镍正极高温下充电正反应的进行,提高析氧过电位.更多还原

【Abstract】 Different contents of Na2WO4 reagents were added to nickel positive electrode to enhance its high temperature performance. The results showed that, compared with blank electrode without Na2WO4, positive nickel electrode with Na2WO4 displayed an improved high temperature charging performance. Under the conditions of 70 ℃ and 1.0%(w) Na2WO4, high temperature charging efficiency over 85% was obtained for nickel positive electrode. Moreover, Na2WO4 was also favorable for the discharging capacity, cycle life, and charge retention. It was also found that, when Na2WO4 was added into nickel positive electrode, the main charging oxidation reaction of Ni(OH)2 was accelerated as well as oxygen extraction over-potential.更多还原