TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Properties: The spherically-shaped natural graphite particle has average particle diameter of 5-40 mu m. Preferred Composition: The content of amorphous or semi-crystalline carbon is 1-20 pts. wt. with respect to 100 pts. wt. spherically-shaped natural graphite particles. The spherically-shaped natural graphite-modified composite particle further comprises lithium compound comprising lithium oxide and/or lithium carbonate, and the lithium compound is coated on the surface of the spherically-shaped natural graphite particle, and the lithium compound is present the open gap positioned on the surface part and inside the spherically-shaped natural graphite particle. The content of lithium compound is 0.01-10 pts. wt. with respect to 100 pts. wt. spherically-shaped natural graphite particles. Preferred Process: Preparation of negative active material involves coating the surface of the spherically-shaped natural graphite particles with the amorphous or semi-crystalline carbon precursor and the lithium acetate and impregnating the amorphous or semi-crystalline carbon precursor and the lithium acetate in the open gap present on the surface portion and inside the spherically-shaped natural graphite particles, drying the solution subjected to the ultrasonication to obtain a spherically-shaped natural graphite-modified particle and heat-treating the spherically-shaped natural graphite-modified particles to prepare spherically-shaped natural graphite-modified composite particle including amorphous or semi-crystalline carbon and a lithium compound that are coated on the surface of the spherically-shaped natural graphite particles. The ultrasonication is performed by radiating ultrasonic waves at oscillating frequency of 10-35 kHz with power of 10-100 W for 1 minute to 24 hours. The drying process is performed using spray dry method chosen from rotary spray, nozzle spray, and ultrasonic wave spray methods, using rotary evaporator, vacuum-dry method and/or natural drying method. The heat treating is performed at 500-2500 degrees C.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The amorphous or semi-crystalline carbon precursor comprises citric acid, stearic acid, sucrose, polyvinylidene fluoride, carboxymethyl cellulose, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene monomer, sulfonated ethylene-propylene-diene monomer, starch, phenolic resin, furan resin, furfuryl alcohol, polyacrylic acid, sodium polyacrylate, polyacrylonitrile, polyimide, epoxy resin, cellulose, styrene, polyvinyl alcohol, polyvinylchloride, coal-based pitch, petroleum-based pitch, mesophase pitch, low molecular weight heavy oil, glucose, gelatin, and/or saccharides. The content of amorphous or semi-crystalline carbon precursor is 2-80 pts. wt. with respect to 100 pts. wt. spherically-shaped natural graphite particles. The content of lithium acetate is 0.1-20 pts. wt. with respect to 100 pts. wt. spherically-shaped natural graphite particles.