| 초록 |
More advanced lithium-ion batteries (LIBs) are critical to be developed for application in next-generation energy storage system (ESS). Tin (IV) oxide, SnO2, is one of highly promising anode candidates due to its higher theoretical capacity (782 mAh g-1) compared with graphite, abundance, environmental friendliness, and safety with organic electrolytes. However, a rapid capacity fading and poor rate capabilities arising from the large volume expansion and subsequent agglomeration of Sn nanoparticles have been major issues of SnO2. Here, we have synthesized one-dimensional (1D) SnO2-amorphous titanium (IV) oxide NTs (SnO2-a-TiO2 NTs), which allow both facile ionic and electron transport as well as easy penetration of electrolytes. Such electrode architecture was simply fabricated by electrospinning and subsequent calcination without further treatments. Introduction of a-TiO2 results in the higher Li diffusivity, which arises from the pseudocapacitive properties of a-TiO2. Furthermore, a-TiO2 also acts as a buffering agent to alleviate the large volume changes of SnO2. As a result, SnO2-a-TiO2 NTs exhibit both excellent cycle retention characteristics (1050.2 mAh g-1 after 250 cycles) and outstanding rate capability (522.3 mAh g-1 at a current density of 5000 mA g-1). |
