Efficient honeycomb–shaped biochar anodes for lithium-ion batteries from Eichhornia crassipes biomass

摘要: Converting waste biomass into biochar is a means for solving both environmental pollution and energy shortage. Here we transformed Eichhornia crassipes, harmful floating plant, honeycomb-shaped heteroatoms-rich by KOH activation during carbonization, tested this as anode lithium-ion batteries. Results show that the has high surface area of 278.56 m2·g−1, honeycomb-like porous structure, rich in heteroatoms, e.g., 3.42% N, 20.82% O, 0.83% S. Biochar anodes displayed higher initial reversible specific capacity 697 mAh·g−1 at 50 mA·g−1, rate capability 229.7 mAh·g−1 3000 mA·g−1, better cyclic stability than commercial graphite. The enhanced electrochemical performance could be attributed to interconnected structure promotes Li+ transfer electrolyte infiltration, presence heteroatoms. This approach can easily industrialized substitute