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Supercapacitor characteristics of pressurized RuO2/carbon powder as binder-free electrodes

机译:加压RuO2 /碳粉作为无粘结剂电极的超级电容器特性

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RuO2/carbon powder electrodes have been designed to be enclosed in a supercapacitor cell and compressed under a constant pressure (4.84 kgf cm(-2)), which could overcome binder failure under repeated volumetric changes. In this binder-free powder electrode system, the resistance and ESR are substantially decreased (0.39 U at 1 kHz) and the capacitive retention is also greatly improved (7% decrement after 4000 cycles) with a maximum specific capacitance of 835 F (g of total electrode weight)(-1), corresponding to 1391.7 F (g of RuO2 weight)(-1), which is likely close to the intrinsic energystorage capability of RuO2 materials. Comparing the specific capacitances at different discharge rates of 5 mV s(-1) and 100 mV s(-1), a decrement of only 24% occurs in specific capacitance, which is considered to be excellent in RuO2 systems. Furthermore, in the Ragone plot analysis, the developed binder-free system shows an excellent energy and power density of 24.9 W h kg(-1) and 16.1 kW kg(-1), respectively, at 50 mV s(-1), which are ca. 63.2% and 44.7% higher, respectively, than those of a typical binder-containing system (11.1 W h kg(-1) and 7.2 kW kg(-1)).
机译:RuO2 /碳粉电极已设计为封闭在超级电容器电池中,并在恒定压力(4.84 kgf cm(-2))下压缩,这可以克服在重复的体积变化下粘合剂失效的问题。在这种无粘合剂的粉末电极系统中,电阻和ESR大大降低(在1 kHz时为0.39 U),并且电容保持率也得到了极大的改善(4000次循环后降低了7%),最大比电容为835 F(g总电极重量)(-1),对应于1391.7 F(RuO2重量g)(-1),这很可能接近RuO2材料的固有储能能力。比较在5 mV s(-1)和100 mV s(-1)的不同放电速率下的比电容,比电容仅减少24%,这在RuO2系统中被认为是极好的。此外,在Ragone图分析中,开发的无粘结剂系统在50 mV s(-1)时分别具有24.9 W h kg(-1)和16.1 kW kg(-1)的出色能量和功率密度,大约是与典型的含粘合剂系统(分别为11.1 W h kg(-1)和7.2 kW kg(-1))相比,分别提高了63.2%和44.7%。

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