posted on 2024-01-29, 15:03authored byJiale Wan, Sicheng Fan, Jiakang Qu, Pin Du, Jinxia Wang, Qiushi Song, Zhiqiang Ning, Kai Yu, Huayi Yin, Hongwei Xie
Achieving
fast energy storage at high power levels from sodium-ion
batteries (SIBs) is essential for terawatt-hour (TWh) supply/storage.
Designing and preparing electrode materials to meet ultrafast rates
is a necessity. Herein, we design and synthesize a graphitic sheet
(GS) anode material with abundant structural defects and mesopores
by a low-temperature, simple, and short-flow method using calcium
carbide (CaC2) and CCl4 feedstocks. The GSs
are of 20–130 nm in thickness and several micrometers in width,
which support a fast charge transfer rate for [Na-diglyme]+ and a high storage capacity. After annealing, the treated GSsH500
exhibits a fast rate performance (23 s), a long cycle stability (40 000
cycles), and a high Coulomb efficiency (99.95%) by pseudocapacitive
process. These findings provide new highlights for designing high-capacity,
long-life graphite anode materials of SIBs for grid-scale energy storage.