Liu Zhaomeng, Wang Jue, Ding Hongbo, Chen Suhua, Yu Xinzhi, Lu Bingan
School of Physics and Electronics , Hunan University , Changsha 410082 , China.
Fujian Strait Research Institute of Industrial Graphene Technologies , Jinjang 362200 , China.
ACS Nano. 2018 Aug 28;12(8):8456-8466. doi: 10.1021/acsnano.8b03961. Epub 2018 Jul 30.
This design provides a scalable route for in situ synthesizing of special carbon nanoscrolls as the cathode for an aluminum battery. The frizzy architectures are generated by a few graphene layers convoluting into the hollow carbon scroll, possessing rapid electronic transportation channels, superior anion storage capability, and outstanding ability of accommodating a large volume expansion during the cycling process. The electrochemical performance of the carbon nanoscroll cathode is fully tapped, displaying an excellent reversible discharge capacity of 104 mAh g at 1000 mA g. After 55 000 cycles, this cathode retains a superior reversible specific capacity of 101.24 mAh g at an ultrafast rate of 50 000 mA g, around 100% of the initial capacity, which demonstrates a superior electrochemical performance. In addition, anionic storage capability and structural stability are discussed in detail. The battery capacity under a wide temperature range from -80 to 120 °C is examined. At a low temperature of -25 °C, the battery delivers a discharge capacity of 62.83 mAh g after 10 000 cycles, obtaining a capacity retention near 100%. In addition, it achieves a capacity of 99.5 mAh g after 4000 cycles at a high temperature of 80 °C, with a capacity retention close to 100%. The carbon nanoscrolls possess an outstanding ultrafast charging/variable discharging rate performance surpassing all the batteries previously reported, which are highly promising for being applied in energy storage fields.
这种设计为原位合成特殊碳纳米卷提供了一种可扩展的途径，该碳纳米卷可作为铝电池的阴极。卷曲状结构由几层石墨烯卷曲成中空碳卷而形成，具有快速的电子传输通道、优异的阴离子存储能力以及在循环过程中适应大体积膨胀的出色能力。碳纳米卷阴极的电化学性能得到了充分挖掘，在1000 mA g的电流密度下显示出104 mAh g的优异可逆放电容量。经过55000次循环后，该阴极在50000 mA g的超快电流密度下仍保持101.24 mAh g的优异可逆比容量，约为初始容量的100%，这表明其具有卓越的电化学性能。此外，还详细讨论了阴离子存储能力和结构稳定性。研究了在-80至120°C的宽温度范围内电池的容量。在-25°C的低温下，电池经过10000次循环后放电容量为62.83 mAh g，容量保持率接近100%。此外，在80°C的高温下经过4000次循环后，其容量达到99.5 mAh g，容量保持率接近100%。碳纳米卷具有出色的超快充电/可变放电速率性能，超过了此前报道的所有电池，在储能领域具有很高的应用前景。
