Umicore

Umicore Korea, Ltd.

WooRam Cho

Maxime Blangero

JiHye Kim

Da-In Choi

Jihye Kim

A powderous positive electrode material for a lithium secondary battery has the general formula Li[NiMM'M&#x2033;]O. M is one or more elements of the group Mn, Zr and Ti. M&#x2032; is one or more elements of the group Al, B and Co. M&#x2033; is a dopant different from M and M&#x2032;, and x, a, b and c are expressed in mol with &#x2212;0.02&#x2264;x&#x2264;0.02, 0&#x2264;c&#x2264;0.05, 0.10&#x2264;(a+b)&#x2264;0.65 and 0&#x2264;z&#x2264;0.05. The material has an unconstrained cumulative volume particle size distribution value (&#x393;(D10)), a cumulative volume particle size distribution value after having been pressed at a pressure of 200 MPa (&#x393;(D10)) and a cumulative volume particle size distribution value after having been pressed at a pressure of 300 MPa (&#x393;(D10)). When &#x393;(D10) is compared to &#x393;(D10), the relative increase in value is less than 100%. When &#x393;(D10) is compared to &#x393;(D10), the relative increase in value is less than 120%.

Positive electrode materials having a superior hardness strength

A powderous positive electrode material for a lithium secondary battery, the material having the general formula Li+x[Ni1&#x2212;a&#x2212;b&#x2212;cMaM'bM&#x2033;c]1&#x2212;xO2&#x2212;z; M being either one or more elements of the group Mn, Zr and Ti, M&#x2032; being either one or more elements of the group Al, B and Co, M&#x2033; being a dopant different from M and M&#x2032;, x, a, b and c being expressed in mol with &#x2212;0.02&#x2264;x&#x2264;0.02, 0&#x2264;c&#x2264;0.05, 0.10&#x2264;(a+b)&#x2264;0.65 and 0&#x2264;z&#x2264;0.05; and wherein the powderous material is characterized by having a BET value &#x2264;0.37 m/g, a Dmax&#x3c;50 &#x3bc;m, and a hardness strength index &#x394;&#x393;(P) of no more than 100%+(1&#x2212;2a&#x2212;b)&#xd7;160% for P=200 MPa, wherein (Formula I) (I) with D 10p=0 being the D10 value of the unconstrained powder (P=0 M Pa), r&#xb0;(D 10p=0) being the cumulative volume particle size distribution of the unconstrained powder at D 10p=0, and &#x393;(D 10p=0) being the cumulative volume particle size distribution at D10p=0 of the pressed samples with P being expressed in M Pa.

Growing community of inventors

Gyeonggi-do, South Korea

WooRam Cho