Effects of doping on the electrical conductivity and particle size in olivine type LiFePO₄powders
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To get a fine LiFePO₄ powder with high electrical conductivity, the influences of doping of aliovalent elements (Cr + B and Cr + Al) on electrical conductivity and of heat treatment conditions on particle size of the doped powders were studied. Two kinds of the doped powders LiFe0.965Cr0.03B0.005PO4 and LiFe0.965Cr0.03Al0.005PO₄were synthesized using mechanochemical milling and subsequent heat treatment at 675~750oC for 5~10 h. The doping enhanced grain growth and electrical conductivity. The electrical conductivity at 30oC was 1 × 10−8S/cm in the doped with Cr and Al, and 5 × 10−10 S/cm in the undoped one.
Abstract
To get a fine LiFePO₄ powder with high electrical conductivity, the influences of doping of aliovalent elements (Cr + B and Cr + Al) on electrical conductivity and of heat treatment conditions on particle size of the doped powders were studied. Two kinds of the doped powders LiFe0.965Cr0.03B0.005PO4 and LiFe0.965Cr0.03Al0.005PO₄were synthesized using mechanochemical milling and subsequent heat treatment at 675~750oC for 5~10 h. The doping enhanced grain growth and electrical conductivity. The electrical conductivity at 30oC was 1 × 10−8S/cm in the doped with Cr and Al, and 5 × 10−10 S/cm in the undoped one.
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