Patent ID: 6689513
Filing Date: 2004-02-10
Classification: H01M,Y02E

Abstract:
A lithium secondary battery comprising:a positive electrode comprising a lithium containing oxide as a positive electrode active material, a negative electrode comprising graphite capable of reacting to insert and extract lithium ions as a negative electrode active material, an electrolyte solution, a separator, and a ligand selected from the group consisting of coronands, podanocoronands, cryptands, spherands, and mixtures thereof, wherein: said electrolyte solution comprises a solvent and an electrolyte dissolved in said solvent, said solvent has about a donor number of 20 or less, said ligand is oriented at an interface of said electrolyte solution and a surface of the positive electrode and at an interface of said electrolyte solution and a surface of the negative electrode, said ligand has a stronger coordination selecting capacity than said solvent or said electrolyte for lithium ions, said ligand has a cyclic structure having a pore, said pore has a diameter of about 1.7 angstroms or more, and the concentration of said ligand in said battery is either (i) in a range of 1.67Ã—10âˆ’2 to 10âˆ’4 by molar ratio to said electrolyte, or (ii) in a range of 110 micromole to 1 millimole per 1 Ah of the capacity of said battery.