Patent ID: 8129053
Filing Date: 2012-03-06
Classification: H01M,Y02E

Abstract:
1. A secondary battery comprising a cathode active material having low-electrolyte wettability as a main ingredient, wherein a perfluorinated sulfonamide substituent-containing polymer (“additive”) is added to (i) a cathode mix, or (ii) an electrolyte, or (iii) a cathode mix and an electrolyte to thereby improve high-rate discharge properties, and wherein the cathode active material having the low wettability on the electrolyte is a multi-component cathode active material containing at least two transition metal elements, and wherein the additive is a modified copolymer having perfluorinated sulfonamide substituent(s) bound to either or both ends of a block copolymerization structure of polyethylene oxide (PEO) and polypropylene oxide (PPO), and wherein the PEO-PPO block copolymer comprises a PEO block and PPO block, and upon construction of both ends of the block copolymer, a perfluorinated sulfonamide substituent is bound to the end of the PEO block.