The Journal of Physical Chemistry C 2022, 126 Understanding the Origin of the Nonpassivating Behavior of Si-Based Anodes during the Initial Cycles.
Veith, Rohit Satish, Terri Lin, Glenn Teeter, Robert Kostecki. This article is cited by 522 publications. The electrospun core–shell one-dimensional fibers suggest a new design principle for robust and scalable lithium battery electrodes suffering from volume expansion.
The unique core–shell structure resolves various issues of Si anode operations, such as pulverization, vulnerable contacts between Si and carbon conductors, and an unstable sold-electrolyte interphase, thereby exhibiting outstanding cell performance: a gravimetric capacity as high as 1384 mAh/g, a 5 min discharging rate capability while retaining 721 mAh/g, and cycle life of 300 cycles with almost no capacity loss. In the core–shell fibers, commercially available nanoparticles in the core are wrapped by the carbon shell. Herein, we develop an electrospinning process to produce core–shell fiber electrodes using a dual nozzle in a scalable manner. Nevertheless, Si suffers from its short cycle life as well as the limitation for scalable electrode fabrication. Because of its unprecedented theoretical capacity near 4000 mAh/g, which is approximately 10-fold larger compared to those of the current commercial graphite anodes, silicon has been the most promising anode for lithium ion batteries, particularly targeting large-scale energy storage applications including electrical vehicles and utility grids.