当前位置: X-MOL 学术Energy Storage Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Modulating the defects of graphene blocks by ball-milling for ultrahigh gravimetric and volumetric performance and fast sodium storage
Energy Storage Materials ( IF 20.4 ) Pub Date : 2020-05-30 , DOI: 10.1016/j.ensm.2020.05.016
Yue Dong , Xieji Lin , Dengke Wang , Renlu Yuan , Su Zhang , Xiaohong Chen , Lyubov G. Bulusheva , Alexander V. Okotrub , Huaihe Song

Dense carbon materials with fast sodium storage performance are strongly desired for developing high-energy and high-power devices, but remain challenging because of the sluggish Na+ transport kinetics. Herein, we report that the defect density and sp2 cluster size of dense graphene blocks (DGB) can be elaborately modulated by ball-milling to achieve both high gravimetric and volumetric capacities and outstanding rate performance for Na+ storage. The loose graphene flakes are cut into small platelets with enriched defects and simultaneously densified by mechanical forces, leading to abundant active sites for Na+ storage, controlled sp2 size as conductive networks, and large interlayer spacing for fast Na+ transport. The DGB performs a novel capacitive Na+ storage with high capacities of 507 mAh g−1 and 397 mAh cm−3 at 50 ​mA ​g−1, and an ultrahigh rate of 181 mAh g−1 at 10 ​A ​g−1. It also shows a remarkable cycle stability due to the strongly-coupled layer structure. The comprehensive performance is superior to most of the reported carbons. The Na-ion capacitor delivers an ultrahigh energy density of 45 ​Wh kg−1 even at 14,205 ​W ​kg−1. Our work broadens the avenue for preparing advanced carbon materials for compact Na+ storage.



中文翻译:

通过球磨调节石墨烯嵌段的缺陷,以实现超高的重量和体积性能以及快速的钠存储

钠盐具有快速的钠存储性能的致密碳材料是开发高能量和高功率设备的强烈要求,但由于Na +传输动力学缓慢而仍然具有挑战性。在这里,我们报告可以通过球磨机精细地调制致密石墨烯嵌段(DGB)的缺陷密度和sp 2簇大小,以实现高重量和体积容量以及出色的Na +存储速率性能。将松散的石墨烯薄片切成具有丰富缺陷的小薄片,并同时通过机械力进行致密化,从而导致大量的Na +储存活性位点,受控的sp 2大小作为导电网络,以及较大的中间层间距以实现快速Na+运输。的DGB执行新颖电容的Na +把存储与507毫安克高容量-1和397毫安厘米-3在50mA克-1,和181毫安g的超高速度-1以10 A G - 1。由于强耦合层结构,它还显示了出色的循环稳定性。综合性能优于大多数报道的碳。即使在14,205 W kg -1的条件下,Na离子电容器也能提供45 Wh kg -1的超高能量密度。我们的工作拓宽了制备用于紧凑型Na +储存的高级碳材料的途径。

更新日期:2020-05-30
down
wechat
bug