ACTIVE CATHODE MATERIAL FOR RECHARGEABLE LITHIUM CELLS Russian patent published in 2011 - IPC H01M4/525 H01M10/52 

FIELD: electrical engineering.

SUBSTANCE: proposed material comprises mixed lithium and transition metal oxide represented by the following formula containing surplus lithium and nickel with mean oxidation degree exceeding 2+ to display improved rate characteristics at high charge/discharge rates: Li_1+aNi'_bNi"_cMn_dCo_eO₂ (I), where a, b, c, d and e are determined by equation 1.1 ≤(1+a)/(b+c+d+e)<1.3; mean oxidation degree of each said transition metal element id represented as follows: Ni'>2+, Ni"=3+, Mn=4+ and Co=3+; 0≤e≤0,1; 0.2<b+c≤0.55, 0.2<d≤0.55 and l(b+c)-d|≤0.1.

EFFECT: stable crystalline structure and perfect dynamic characteristics of rate at high charge/discharge rates.

5 cl, 10 dwg, 25 ex