ACTIVATED BIOCARBON FROM PEANUT SHELL AS CATHODE FOR LITHIUM SULFUR BATTERIES

MARÍA LUZ NIEVA; MARÍA DEL CARMEN ROJAS; MARIA LAURA PARA; OSVALDO CÁMARA; GUILLERMINA LUQUE; E. LAURA, MOYANO

Puerto Vallarta

Congreso; XXVII Congreso Iberoamericano de Catálisis; 2020

The utilization of low-value, abundant and sustainable biomass materials for high-value energy storage application is remarkable important nowadays for energy storage in vehicle electrification and for intermittent renewable energy sources such as solar and wind energy. Among the most promising next generation energy storage batteries, we can find lithium sulfur batteries that have a high theoretical specific capacity and high energy density. In the present article we propose the use of peanut shell as a source of carbonaceous material for lithium-sulfur cathodes. Different biocarbons were obtained at low temperature pyrolysis by changing the conditions of the synthesis by acid or basic pre-treatment and the effect of these treatments in the physical characteristic, and in their performance as cathodes in lithium-sulfur batteries were studied. We found that the treatment changes the type of porous generated and therefore their electrochemical performance showing that the best response is obtained whit the basic treatment. The best electrode material was peanut shell treated and washed obtaining an initial capacity around 700 mAh/g with high cycling stability and a coulombic efficiency higher than 95 %. We also compare this biocarbon with one commercial carbon (Super P). This works allows obtaining an efficient electrode giving great added values to bio-waste materials.