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Novel synthesis of LiFePO4–Li3V2(PO4)3 composite cathode material by aqueous precipitation and lithiation

✍ Scribed by Jun-chao Zheng; Xin-hai Li; Zhi-xing Wang; Sha-sha Niu; De-rong Liu; Ling Wu; Ling-jun Li; Jin-hui Li; Hua-jun Guo

Book ID
104025888
Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
749 KB
Volume
195
Category
Article
ISSN
0378-7753

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✦ Synopsis

LiFePO 4 -Li 3 V 2 (PO 4 ) 3 composite cathode material is synthesized by aqueous precipitation of FeVO 4 •xH 2 O from Fe(NO 3 ) 3 and NH 4 VO 3 , following chemical reduction and lithiation with oxalic acid as the reducer and carbon source. Samples are characterized by XRD, SEM and TEM. XRD pattern of the compound synthesized at 700 • C indicates olivine-type LiFePO 4 and monoclinic Li 3 V 2 (PO 4 ) 3 are co-existed. TEM image exhibits that LiFePO 4 -Li 3 V 2 (PO 4 ) 3 particles are encapsulated with a carbon shell 5-10 nm in thickness. The LiFePO 4 -Li 3 V 2 (PO 4 ) 3 compound cathode shows good electrochemical performance, and its discharge capacity is about 139.1 at 0.1 C, 135.5 at 1 C and 116 mA h g -1 at 3 C after 30 cycles.

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