IRREVERSIBLE ADDITIVE CONTAINED IN CATHODE MATERIAL FOR SECONDARY BATTERY, CATHODE MATERIAL COMPRISING SAME, AND SECONDARY BATTERY COMPRISING CATHODE MATERIAL

• Main Authors: LIM SUNGUL, JANG MINUL, KANG YONG-HEE, UHM INSUNG, CHOI JUNGHUN, YOUN HEEANG
• Format: Patent
• Language: Chinese; English
• Published: 14.01.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The present invention provides an irreversible additive contained in a cathode material for a secondary battery, a cathode material comprising the irreversible additive, and a secondary battery comprising the cathode material. The irreversible additive is an oxide represented by chemical formula 1, Li2+aCu1-bMbO2+c(1), and the oxide has a monoclinic crystal structure. In the formula (1), -0.2 <=a<=0.2, 0<=b<=0.5, and 0<=c<=0.2, and M is at least one element selected from the group consisting of Ni, Mg, Pt, Al, Co, P, and B. 本发明提供了一种包含在二次电池用正极材料中的不可逆添加剂、包含其的正极材料以及包含该正极材料的二次电池，其中所述不可逆添加剂是以下化学式1表示的氧化物，并且其中所述氧化物具有单斜晶系晶体结构，Li2+aCu1-bMbO2+c(1)，在该式中，-0.2≤a≤0.2，0≤b<0.5，0≤c≤0.2，并且M是选自由Ni、Mg、Pt、Al、Co、P和B组成的组中的至少一种元素。