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AssigneeSamsung SDI Co., Ltd.
InventorsBeom-Kwon Kim, Jae-Myung Kim, So-Ra Lee, Ui-Song Do, Chang-Su Shin
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In an aspect, a negative active material, a method of preparing the negative active material, and a lithium battery including the negative active material are provided. The method of preparing the negative active material may increase pulverizing efficiency in pulverizing a silicon-based bulky particle into a nano-size silicon-based primary particle and decrease a capacity loss of the obtained negative active material. The nano-size negative active material has excellent crystalline characteristics, high capacity, and high initial efficiency, due to a decrease in surface oxidation and surface damage.
A negative active material comprising silicon-based primary particles that are composed of crystalline silicon having a Raman shift in a range of 500 to 510 cm−1 measured by Raman spectroscopy and that has an average particle size of about 100 to about 500 nm, wherein the silicon-based primary particles are Si, Si—Z alloy (where Z is at least one selected from the group consisting of Mg, Ca, Sr, Ba, Ra, Sc, Y, La, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Tc, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, B (boron), Ge, P (phosphorus), As, Sb, Bi, S, Se, Te, and Po), or a combination thereof.
Dependencies are inferred from the claim text.