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Improving electrochemical properties of lithium iron.pdf

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Improving electrochemical properties of lithium iron

Aa m n p o 8 ? K 1 c p a e c r t f h a t s r t e d t 0 dJournal of Power Sources 165 (2007) 646–650 Short communication Improving electrochemical properties of lithium iron phosphate by addition of vanadium Mu-Rong Yang ?, Wei-hsin Ke, She-huang Wu Department of Materials Engineering, Tatung University, 40 Chungshan N. Rd, Sec.3, Taipei 104, Taiwan Available online 28 November 2006 bstract The poor conductivity, resulting from the low lithium-ion diffusion rate and low electronic conductivity in the LiFePO4 phase, has posed bottleneck for commercial applications. Well-crystallized LiFePO4-based powders with vanadium addition were synthesized with solution ethod. The synthesized powders are coated with carbon. The powder containing the well-mixed LiFePO4 and Li3V2(PO4)3 phases (LFVP) with arrow distributed particle size ranging between 0.5 and 2.5 m exhibits improved electrochemical performance. The small particle size and the resence of the electronically conductive mixed phases can be the reasons why the cells containing LFVP exhibit the high discharge capacity f about 100 mAh g?1 at 10 C, whereas the samples with single phase, such as LiFePO4 and Li3V2(PO4)3, have the discharge capacity less than 0 Ah g?1 at the same rate. 2006 Elsevier B.V. All rights reserved. eywords: Lithium iron phosphate; Cathode material; Vanadium ( t h e [ L e s r r h 2 2. Introduction Among the several materials under development for use as athodes in lithium ion secondary batteries, lithium iron phos- hate LiFePO4 has been recognized as a promising candidate s material for cathode of Li-batteries due to the low cost, nvironmental benignity, cycling stability, and high theoretical apacity of 170 Ah g?1 [1,2]. However, the poor conductivity, esulting from the low lithium-ion diffusion rate and low elec- ronic conductivity in the LiFePO4 phase, has posed a bottleneck or commercial applications. Improvements in the conductivity ave been achieved by two ways. One is to synthesize small nd mo