Jang Wook Choi

TL;DR: A review of post-lithium-ion batteries is presented in this paper with a focus on their operating principles, advantages and the challenges that they face, and the volumetric energy density of each battery is examined using a commercial pouch-cell configuration.

TL;DR: It is shown that anodes consisting of an active silicon nanotube surrounded by an ion-permeable silicon oxide shell can cycle over 6,000 times in half cells while retaining more than 85% of their initial capacity.

TL;DR: Using nitrogen-doped graphene produced by a simple plasma process, ultracapacitors are developed whose capacitances are about 4 times larger than those of pristine graphene based counterparts without sacrificing other essential and useful properties for ultracAPacitor operations including excellent cycle life, high power capability, and compatibility with flexible substrates.

TL;DR: Wearable power devices using everyday textiles as the platform, with an extremely simple "dipping and drying" process using single-walled carbon nanotube (SWNT) ink, are described, which show outstanding flexibility and stretchability and demonstrate strong adhesion between the SWNTs and the textiles of interest.

TL;DR: High-performance supercapacitors are demonstrated by building a three-dimensional (3D) macroporous structure that consists of chemically modified graphene (CMG) that endows MnO(2)/e-CMG composite electrodes with excellent electrochemical properties.