Pore Structure Manipulation Enhanced Sodium Storage of
Calcium-lignosulfonate-based Hard Carbon
Abstract
Sodium-ion batteries (SIBs) have attracted a lot of attention owing to
the low cost, as well as similar working mechanism and manufacturing
technique with Lithium-ion batteries (LIBs). However, the practical
application of SIBs is severely hindered by limited electrode materials.
Disordered carbons are reported to be promising as anode materials for
SIBs. Here, for the first time, calcium lignosulfonate (LSCa), one
papermaking waste, is explored as a novel low-cost precursor for carbon
materials of SIBs. The optimized LSCa-derived carbon delivers a high
reversible capacity of 317 mA h g -1 at 30 mA g
-1 with ~ 60% plateau capacity and it
retains a capacity of 170 mA h g -1 even at 3000 mA g
-1. These achievements are ascribed to the larger d
002 value, smaller defects and more closed pores,
compared to the original sample from the direct carbonization of LSCa.