posted on 2024-01-03, 13:35authored byYaru Li, Youdi Hu, Shuaiqi Wang, Xiaoze Zhou, Yi Yang, Xiao Xiao, Gang Chen
Dendritic Li deposition, an unstable
solid–electrolyte
interphase
(SEI), and a nearly infinite relative volume change during cycling
are three major obstacles to the practical application of Li metal
batteries. Herein, we introduce a compressible and elastic reduced
graphene oxide sponge (rGO-S) to simultaneously eliminate Li dendrite
growth, stabilize the SEI, and accommodate the volume change. The
volume change is contained by compressing and expanding the rGO-S
anode, which effectively releases the Li plating-induced stress during
cycling. The smooth and dense Li metal is deposited on rGO-S without
dendrites, which preserves the SEI, reduces consumption of the electrolyte,
and prevents the formation of Li debris. The half-cells employing
rGO-S show a steady and high Coulombic efficiency. The Li@rGO-S symmetric
cells demonstrate excellent cycling stability over 1200 cycles with
a low overpotential. When paired with LiFePO4 (LFP), the
Li@rGO-S||LFP full cells exhibit a high specific capacity (150.3 mAh
g–1 at 1C), superior rate performance, and good
capacity retention.