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High voltage lithium ion positive electrode material

Patent image
ARL

A positive electrode material having a nominal stoichiometry Li1+y/2Co1−x−y−z−dSizFexMyM′d(PO4)1+y/2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and/or Ga, M′ is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and/or Mg, y is within a range of 0<y≦0.10 and x is within a range of 0≦x≦0.2. The use of double compositional modification to LiCoPO4 increases the discharge capacity from ˜100 mAh/g to about 130 mAh/g while retaining the discharge capacity retention of the singly Fe-substituted LiCoPO4. Additional compositional modification to include Si increases the cycle life and greatly improved the coulombic efficiency to between 97-100% at a C/3 cycle rate.

Inventors: 
Allen, Jan L.; Allen, Joshua L.; Delp III, Samuel A.; Wolfenstine, Jeffrey B.; Jow, Richard T.
Patent Number: 
Technical domain: 
Electronics and Energy
FIle Date: 
2014-05-20
Grant Date: 
2016-05-31
Grant time: 
742 days
Grant time percentile rank: 
13
Claim count percentile rank: 
7
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US ARMY