Login / Signup

Ultrathin positively charged electrode skin for durable anion-intercalation battery chemistries.

Davood SabaghiZhiyong WangPreeti BhauriyalQiongqiong LuAhiud MoragDaria MikhailoviaPayam HashemiDongqi LiChristof NeumannZhongquan LiaoAnna Maria DominicAli Shaygan NiaRenhao DongEhrenfried ZschechAndrey TurchaninThomas HeineMinghao YuXinliang Feng
Published in: Nature communications (2023)
The anion-intercalation chemistries of graphite have the potential to construct batteries with promising energy and power breakthroughs. Here, we report the use of an ultrathin, positively charged two-dimensional poly(pyridinium salt) membrane (C2DP) as the graphite electrode skin to overcome the critical durability problem. Large-area C2DP enables the conformal coating on the graphite electrode, remarkably alleviating the electrolyte. Meanwhile, the dense face-on oriented single crystals with ultrathin thickness and cationic backbones allow C2DP with high anion-transport capability and selectivity. Such desirable anion-transport properties of C2DP prevent the cation/solvent co-intercalation into the graphite electrode and suppress the consequent structure collapse. An impressive PF 6 - -intercalation durability is demonstrated for the C2DP-covered graphite electrode, with capacity retention of 92.8% after 1000 cycles at 1 C and Coulombic efficiencies of > 99%. The feasibility of constructing artificial ion-regulating electrode skins with precisely customized two-dimensional polymers offers viable means to promote problematic battery chemistries.
Keyphrases
  • ionic liquid
  • solid state
  • carbon nanotubes
  • room temperature
  • high efficiency
  • metal organic framework
  • structural basis