【作者】 李克非；

【导师】 单忠强；

【作者基本信息】 天津大学 ， 应用化学， 2007， 硕士

【摘要】 电池作为一种方便的电能来源,被广泛地应用在各种各样的电子设备中。随着便携式电子设备的迅速发展,及其日益小型化、微型化,人们对化学电源的容量提出了越来越高的要求。人们通过研究发现,金属硼化物中的硼元素处于活化状态,在一定的条件下可以发生电化学氧化反应,给出很高的电化学容量。本文进一步研究了二硼化钛、Fe-B UFAAP和Co-B UFAAP的电化学行为,同时用XRD、XPS和ICP等分析方法研究了发生放电反应后,在电极表面和电解液中生成的产物,并对电极反应的机理进行了探讨。当放电速率为100mA/g时,二硼化钛电极在30%KOH溶液中的放电容量可达800mAh/g;二硼化钛电极在20%KF溶液中的第二个放电平台的放电量可达1400mAh/g。Fe-B UFAAP和Co-B UFAAP在KOH溶液中也表现出了一定的电化学活性,当放电速率为100mA/g时,Fe-B UFAAP电极在30%KOH溶液中的放电量为1200 mAh/g;Co-B UFAAP在30%KOH溶液中的放电量为900 mAh/g。Fe-B UFAAP和Co-B UFAAP电极在30%KOH溶液中均具有一定的循环充放电能力,但是放电容量随循环次数的增加迅速降低。二硼化钛、Fe-B UFAAP和Co-B UFAAP作为非水锂离子电池的负极也表现出了一定的循环性能。我们通过研究发现,金属硼化物在水溶液中具有很高的电化学容量,在非水溶液中也具有一定的循环能力,是一种很有潜力的电极材料。更多还原

【Abstract】 Electrochemical batteries have been serving as convenient power sources for various portable electronic devices.The developing of portable electronic devices demands searching for new batery systems with higher energy density.It has been found that the boron element in metal borides is activated,and can be electrochemically oxidized with very high discharge capacity.We further studied the electrochemical behaviors of TiB2,Co-B UFAAP and Fe-B UFAAP,and the discharge products by XRD,XPS and ICP.We also discussed the possible mechanism of discharge reaction.Discharged at a constant rate of 100mA/g, TiB2 electrode gives out a discharge capacity of 800mAh/g in 30%KOH solution.In 20%KF solution,the discharge capacity of the second discharge stage can reach as high as 1400mAh/g.Co-B UFAAP and Fe-B UFAAP also exhibit electrochemical activities.When discharged at 100mA/g in 30%KOH solution, the discharge capacity of Fe-B UFAAP is 1200mAh/g,and Co-B UFAAP, 900mAh/g.Both Fe-B UFAAP and Co-B UFAAP anode show certain capability of recycling performance,but the discharge capacity decreased sharply with the increasing of cycling number.TiB2,Co-B UFAAP and Fe-B UFAAP also exhibit certain recyling performance as the anodes of Li-ion batteries in organic electrolyte.Our studies showed that metal borides have very high discharge capacity in water solutions and exhibit certain recycling capability in organic electrolyte.They may become very attractive anode materials.更多还原