High Rate Capability Lithium Iron Phosphate Wired by Carbon Nanotubes and Galvanostatic Transformed to Graphitic Carbon

2012 ◽  
Vol 159 (4) ◽  
pp. A336-A341 ◽  
Author(s):  
M. Gnanavel ◽  
Manu U. M. Patel ◽  
A. K. Sood ◽  
Aninda J. Bhattacharyya
Keyword(s):  
Carbon Nanotubes ◽  
Lithium Iron Phosphate ◽  
Rate Capability ◽  
Iron Phosphate ◽  
Graphitic Carbon ◽  
High Rate ◽  
High Rate Capability

Carbon-Coated, Bismuth-Substituted, Lithium Iron Phosphate as Cathode Material for Lithium Secondary Batteries

2013 ◽  
Vol 739 ◽  
pp. 21-25 ◽  
Author(s):  
Xiang Yin Mo ◽  
Xiao San Feng ◽  
Yi Ding ◽  
Cai Rong Kang
Keyword(s):  
Discharge Capacity ◽  
Carbon Coating ◽  
Lithium Iron Phosphate ◽  
Rate Capability ◽  
Iron Phosphate ◽  
Solid State Reaction Method ◽  
High Rate ◽  
High Discharge Capacity ◽  
Lithium Secondary Batteries ◽  
Carbon Coated

Carbon-coated, bismuth-doped, lithium iron phosphates, LiFe1xBixPO4(0x0.05), have been synthesized by a solid-state reaction method. From the optimization, the carbon-coated LiFe0.95Bi0.05PO4phase showed superior performances in terms of phase purity and high discharge capacity. The structural, morphological, and electrochemical properties were studied and compared to carbon-coated, LiFePO4. The Li/LiFe0.95Bi0.05PO4with carbon coating cell delivered an initial discharge capacity of 145 mAh/g and was 30 mAh/g higher than the Li/LiFePO4with carbon coating cell. Cyclic voltammetry revealed excellent reversibility of the LiFe0.95Bi0.05PO4with carbon coating material. High rate capability studies were also performed and showed a capacity retention over 93% during the cycling. It was concluded that substituted Bi ion play an important role in enhancing battery performance of the LiFePO4material through improving the kinetics of the lithium insertion/extraction reaction on the electrode.

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