Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, Xiangtan University, Hunan 411105, PR China.
Nanoscale. 2013 Sep 21;5(18):8586-92. doi: 10.1039/c3nr02435k.
We have successfully fabricated a free-standing Si-re-G (reduced graphene) alternating stratum structure composite through a repeated process of filtering liquid exfoliated graphene oxide and uniformly dispersed Si solution, followed by the reduction of graphene oxide. The as-prepared free-standing flexible alternating stratum structure composite was directly evaluated as the anode for rechargeable lithium half-cells without adding any polymer binder, conductive additives or using current collectors. The half cells based on this new alternating structure composite exhibit an unexpected capacity of 1500 mA h g(-1) after 100 cycles at 1.35 A g(-1). Our rationally proposed strategy has incorporated the long cycle life of carbon and the high lithium-storage capacity of Si into one entity using the feasible and scalable vacuum filtration technique, rendering this new protocol as a readily applicable means of addressing the practical application challenges associated with the next generation of rechargeable lithium-ion batteries.
我们通过反复过滤液态剥离氧化石墨烯和均匀分散的硅溶液，然后还原氧化石墨烯的方法，成功制备了一种独立的 Si-re-G（还原氧化石墨烯）交替层结构复合材料。所制备的独立柔性交替层结构复合材料无需添加任何聚合物粘结剂、导电添加剂或使用集流器，即可直接用作可再充电锂半电池的阳极。基于这种新的交替结构复合材料的半电池在 1.35 A g(-1) 下经过 100 次循环后，表现出了出乎意料的 1500 mA h g(-1) 的容量。我们合理地提出的策略将碳的长循环寿命和硅的高储锂能力纳入到一个实体中，使用可行且可扩展的真空过滤技术，使得这种新的方案成为一种易于应用的方法，可以解决与下一代可再充电锂离子电池相关的实际应用挑战。
