Enhanced High-Temperature Performances of LiFePO4 Cathode with Polyacrylic Acid as Binder

ABSTRACTNanocrystalline copper ferrite (Cu0.5Fe2.5O4) was synthesized using a forward strike gelation method with polyacrylic acid (PAA) as a gelating agent. The dried gel was calcined at a low temperature of 400 °C to get the final powder. The effect of pH and the ratio of the cation to the carboxylic group in the initial gel were studied with respect to both the phases and the crystallite size of the final powders synthesized. Phase and crystallite size analysis were done using x-ray diffraction and TEM. Saturation magnetization results were obtained using a SQUID magnetometer. The reactions occurring in the nano-size copper ferrite, in air as a function of temperature, were tracked using adynamic high temperature x-ray diffraction (HTXRD) system.

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Enhancing High-Temperature Cycle Performance of LiFePO4 Cathode

ECS Meeting Abstracts ◽

10.1149/ma2009-01/3/220 ◽

2009 ◽

Keyword(s):

High Temperature ◽

Cycle Performance ◽

Temperature Cycle ◽

Lifepo4 Cathode

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Cycle performance improvement of LiFePO4 cathode with polyacrylic acid as binder

Electrochimica Acta ◽

10.1016/j.electacta.2012.07.054 ◽

2012 ◽

Vol 80 ◽

pp. 440-444 ◽

Cited By ~ 49

Author(s):

Zhian Zhang ◽

Tao Zeng ◽

Changming Qu ◽

Hai Lu ◽

Ming Jia ◽

...

Keyword(s):

Performance Improvement ◽

Polyacrylic Acid ◽

Cycle Performance ◽

Lifepo4 Cathode

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Nanocomposite Electrodes for Advanced Lithium Batteries: The LiFePO4 Cathode

MRS Proceedings ◽

10.1557/proc-703-v7.9 ◽

2001 ◽

Vol 703 ◽

Author(s):

Shoufeng Yang ◽

Yanning Song ◽

Peter Y. Zavalij ◽

M. Stanley Whittingham

Keyword(s):

High Temperature ◽

Current Density ◽

High Current Density ◽

High Capacity ◽

Discharge Rates ◽

High Temperature Synthesis ◽

Lifepo4 Cathode ◽

Lower Capacity ◽

Lower Discharge ◽

Nanocomposite Electrodes

ABSTRACTLiFePO4 was successfully synthesized by high temperature and hydrothermal synthesis. A nanocomposite was formed by carbon coating this material; initial electrochemical results showed that up to 70% capacity could be obtained at 1.0 mA/cm2 current density. In contrast, the hydrothermally prepared LiFePO4 showed a lower capacity even at lower discharge rates due to a partial occupation of lithium sites by iron. This occupation, identified by Rietveld X-ray refinement, decreased both the rate and degree of intercalation and de-intercalation of lithium; chemical reaction with butyl lithium and bromine confirmed the electrochemical behavior. This investigation showed that the cathode could be prepared by high temperature synthesis, followed by a carbon black coating to achieve high capacity at high current density.

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