LITHIUM SECONDARY BATTERY COMPRISING ISOCYANATE-BASED ADDITIVE

• Main Authors: PARK HUI JUNG, KIM TAE SIK, KIM SOO JIN, SHATUNOV PAVEL, LEE JUN YONG
• Format: Patent
• Language: English; Korean
• Published: 06.05.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

Disclosed is a lithium secondary battery including an isocyanate-based compound to decrease a resistance increase rate due to high temperature storage. According to the present invention, the lithium secondary battery comprises: a positive electrode; a negative electrode; and an electrolyte disposed between the positive electrode and the negative electrode. The positive electrode includes a positive electrode active material represented by Li_xNi_yM_1-yO_2-zA_z, wherein 0.9 <= x <= 1.2, 0.6 < y <= 0.98, 0 <= z < 0.2, M is one or more elements selected from a group consisting of Al, Mg, Mn, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, and Bi, and A is an element having an oxidation number of -1 or -2. The electrolyte comprises: a lithium salt; a nonaqueous solvent; and the isocyanate-based compound. 양극; 음극; 및 상기 양극과 음극 사이에 개재되는 전해질을 포함하고, 상기 양극은 하기 화학식 1로 표시되는 양극활물질을 포함하고, 상기 전해질은 리튬염; 비수계 용매; 및 이소시아네이트계 화합물을 포함하는, 리튬이차전지가 제시된다: <화학식 1> LiNiMOA상기 화학식 1에서, 0.9≤x≤1.2, 0.6<y≤0.98, 0≤z<0.2이고, M은 Al, Mg, Mn, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W 및 Bi로 이루어진 군에서 선택되는 하나 이상의 원소이고; A는 산화수 -1 또는 -2인 원소이다