Lithium ion battery with improved safety

Details Lithium ion battery with improved safety Lithium ion battery with improved safety

2006-04-11

2006-04-11

Barr, Michael (Department: 1746)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

C429S328000, C429S329000

Reexamination Certificate

active

07026074

ABSTRACT:
A lithium battery with improved safety that utilizes one or more additives in the battery electrolyte solution wherein a lithium salt is dissolved in an organic solvent, which may contain propylene, carbonate. For example, a blend of 2 wt % triphenyl phosphate (TPP), 1 wt % diphenyl monobutyl phosphate (DMP) and 2 wt % vinyl ethylene carbonate additives has been found to significantly enhance the safety and performance of Li-ion batteries using a LiPF6salt in EC/DEC electrolyte solvent. The invention relates to both the use of individual additives and to blends of additives such as that shown in the above example at concentrations of 1 to 4-wt % in the lithium battery electrolyte. This invention relates to additives that suppress gas evolution in the cell, passivate graphite electrode and protect it from exfoliating in the presence of propylene carbonate solvents in the electrolyte, and retard flames in the lithium batteries.

REFERENCES:
patent: 5455127 (1995-10-01), Olsen et al.
patent: 6068950 (2000-05-01), Gan et al.
patent: 6506524 (2003-01-01), McMillan et al.
patent: 2002/0164531 (2002-11-01), Sekino et al.
patent: 358214281 (1983-12-01), None
patent: 2001006729 (2001-01-01), None

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