NOVELTY - An energy storage device is obtained by coating a positive electrode active material, a conductive agent and a bonding agent in mass ratio of 80:15:5 on aluminum foil, cutting, drying, coating other surface of positive plate, coating negative electrode active material, conductive agent and bonding agent in mass ratio of 80-85:10-15:5 on aluminum foil, cutting, drying, coating other surface of negative plate, separating positive electrode and negative electrode separated by a membrane, injecting electrolyte, and packaging shell.    USE - Energy storage device e.g. lithium ion battery and super capacitor.    ADVANTAGE - The energy storage device is economical and environmentally-friendly.    DETAILED DESCRIPTION - An energy storage device is obtained by coating a positive electrode active material, a conductive agent and a bonding agent in mass ratio of 80:15:5 on aluminum foil, cutting, drying, coating other surface of positive plate, coating negative electrode active material, conductive agent and bonding agent in mass ratio of 80-85:10-15:5 on aluminum foil, cutting, drying, coating other surface of negative plate, separating positive electrode and negative electrode separated by a membrane, injecting electrolyte, and packaging shell. The positive electrode active material is made of biomass active carbon formed using rice husk, apricot shell and straw, and has specific surface area of more than 1200 m2/g. The rice husk based activated carbon is obtained by cleaning, removing impurity of rice husk at 380 degrees C, carbonizing in nitrogen atmosphere for 2 hours, dipping in 2M potassium hydroxide solution for 6 hours, washing using deionized water, drying, and standing for 12 hours at 700 degrees C. The carbon ratio of potassium hydroxide and carbonized rice husk is 3:1. The apricot shell-based activated carbon is obtained by cleaning, crushing shell at 400 degrees C, carbonizing in nitrogen atmosphere, standing for 12 hours, washing with deionized water, and drying. The straw-based active carbon is obtained by cleaning, crushing straw, carbonizing at 300 degrees C in nitrogen atmosphere, standing for 12 hours, washing with deionized water, and drying. The negative electrode active material is obtained by mixing lithium titanium oxide, graphene and an expanded graphite composite in weight ratio of 90-99:0.5-5:0.5-9.5, and embedding lithium ion. The membrane is polypropylene membrane, polyethylene membrane, polypropylene-polyoxide composite film, or cellulose membrane.