Ecopro Bm Co., Ltd.

Ji Hyun Nam

Moon Ho Choi

Jun Won Suh

Jung Han Lee

Seung Woo Choi

Sung Jin Jang

The present invention relates to a cathode active material for a lithium secondary battery, and more particularly, to a cathode active material for a lithium secondary battery, which includes a core portion and a shell portion surrounding the core portion, in which a total content of cobalt in the core portion and the shell portion is 5 to 12 mol %, and the content of cobalt in the core portion and the shell portion is adjusted to be within a predetermined range. In the cathode active material precursor and the cathode active material for a secondary battery prepared using the same according to the present invention, optimal capacity of a lithium secondary battery may be increased by adjusting the cobalt content in the particles of the cathode active material, and life characteristics may be enhanced by improving stability.

Cathode active material of lithium secondary battery

The present invention relates to a cathode active material composition for a lithium secondary battery and a lithium secondary battery including the same, and more particularly, to a cathode active material composition for a lithium secondary battery, including a mixture of particles which are different in Ni composition and size and prepared at the same heat treatment temperature, and a lithium secondary battery including the same. According to the present invention, optimal capacity manifestation temperatures of a coarse particle and a fine particle may be adjusted to be similar by adjusting an Ni content of the coarse particle and the fine particle, and thus, a lithium secondary battery having enhanced output and lifetime may be manufactured.

Cathode active material for lithium secondary battery and lithium secondary battery comprising the same

The present invention relates to a lithium complex oxide, and more specifically, to a lithium complex oxide of which a range of FWHMvalues maintains a constant relationship with a molar fraction of nickel when measuring XRD defined by a hexagonal lattice having a R-3m space group. The lithium complex oxide according to the present invention exhibits an effect of improving lifetime properties of the cells including high Ni-based cathode active materials accordingly by enabling a range of the FWHMvalues at (104) peaks defined b the hexagonal lattice having the R-3m space group to maintain a constant relationship with the molar fraction of nickel, thereby maintaining the primary particles in a predetermined size range.

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Cheongju-si, South Korea

Ji Hyun Nam