High voltage insertion compounds for lithium batteries

Details High voltage insertion compounds for lithium batteries High voltage insertion compounds for lithium batteries

1996-01-11

1997-05-20

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429223, 429224, 423594, 423599, H01M 450, H01M 1040, C01G 4512

Patent

active

056311044

ABSTRACT:
Insertion compounds having the formula Li.sub.x+y M.sub.z Mn.sub.2-y-z O.sub.4 wherein the crystal structure is spinel-like, M is a transition metal, 0.ltoreq.x<1, 0.ltoreq.y<0.33, and 0<z< about 1, can reversibly insert significant amounts of lithium at potentials greater than about 4.5 volts versus Li/Li.sup.+. In particular, M can be Ni or Cr. The reversible amount of lithium at such voltages can be greater for greater values of z. Such insertion compounds are suitable cathode materials for high voltage lithium batteries.

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J.M. Tarascan, et al., The Spinel Phase of LiMn.sub.2 O.sub.4 as a Cathode in Secondary Lithium Cells, J. Electrochem. Soc., vol. 138, No. 10, Oct. 1991, p. 2859.
Wang Baochen, et al., Studies of spinel LiCr.sub.x Mn.sub.2-x O.sub.4 for secondary lithium battery, Journal of Power Sources, 43-44, (1993) 539-546. (No month).
J.M. Tarascon, Li.sub.1+x Mn.sub.2 O.sub.4 : Materials and Electrochemical Aspects, presented at 11th International Seminar on Primary and Secondary Battery Technology and Application, Feb. 28-Mar. 3, 1994, Deerfield Beach, Florida.
C. Sigala, et al., Positive electrode materials with high operating voltage for lithium batteries: LiCr.sub.y Mn.sub.2-y O.sub.4 (0.ltoreq.y.ltoreq.1), Solid State Ionics 81 (1995), 167-170. (No month).

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