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Title: Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material

Patent ·
OSTI ID:870611
 [1];  [2];  [3];  [4];  [5]
  1. Hayward, CA
  2. Cupertino, CA
  3. Albany, CA
  4. Berkeley, CA
  5. Lafayette, CA
+ Show Author Affiliations

An alkali metal manganese oxide secondary cell is disclosed which can provide a high rate of discharge, good cycling capabilities, good stability of the cathode material, high specific energy (energy per unit of weight) and high energy density (energy per unit volume). The active material in the anode is an alkali metal and the active material in the cathode comprises an orthorhombic alkali metal manganese oxide which undergoes intercalation and deintercalation without a change in phase, resulting in a substantially linear change in voltage with change in the state of charge of the cell. The active material in the cathode is an orthorhombic structure having the formula M.sub.x Z.sub.y Mn.sub.(1-y) O.sub.2, where M is an alkali metal; Z is a metal capable of substituting for manganese in the orthorhombic structure such as iron, cobalt or titanium; x ranges from about 0.2 in the fully charged state to about 0.75 in the fully discharged state, and y ranges from 0 to 60 atomic %. Preferably, the cell is constructed with a solid electrolyte, but a liquid or gelatinous electrolyte may also be used in the cell.

Research Organization:
Univ. of California (United States)
DOE Contract Number:
AC03-76SF00098
Assignee:
Regents, University of California (Oakland, CA)
Patent Number(s):
US 5558961
OSTI ID:
870611
Country of Publication:
United States
Language:
English

References (9)

Lithium extraction from orthorhombic lithium manganese oxide and the phase transformation to spinel journal December 1993
Sur quelques nouvelles phases de formule NaxMnO2 (x ⩽ 1) journal February 1971
Lithium Insertion Processes of Orthorhombic Na[sub x]MnO[sub 2]-Based Electrode Materials journal January 1996
Ramsdellite-MnO2 for lithium batteries: the ramsdellite to spinel transformation journal June 1993
Performance of lithiummanganese oxide spinel electrodes in a lithium polymer electrolyte cell journal February 1991
Spinel Electrodes from the Li-Mn-O System for Rechargeable Lithium Battery Applications journal January 1992
Orthorhombic LiMnO[sub 2] as a High Capacity Cathode for Li-Ion Cells journal January 1995
Electrochemical intercalation and deintercalation of NaxMnO2 bronzes journal May 1985
Solid State Batteries: Materials Design and Optimization book January 1994

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Related Subjects

secondary
cell
orthorhombic
alkali
metal
manganese
oxide
phase
active
cathode
material
disclosed
provide
rate
discharge
cycling
capabilities
stability
specific
energy
unit
weight
density
volume
anode
comprises
undergoes
intercalation
deintercalation
change
resulting
substantially
linear
voltage
charge
structure
formula
z
mn
1-y
capable
substituting
iron
cobalt
titanium
ranges
charged
75
discharged
60
atomic
preferably
constructed
solid
electrolyte
liquid
gelatinous
substantially linear
energy density
active material
alkali metal
solid electrolyte
cathode material
manganese oxide
unit volume
secondary cell
metal capable
cathode comprises
active cathode
specific energy
oxide phase
metal cap
oxide secondary
cycling capabilities
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