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| Study on Heat Treatment Process of Preparation of Lithium Iron Phosphate by Coprecipitation Method |
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Received:June 17, 2019
Revised:June 20, 2019
Accepted:June 24, 2019
Published Online:October 23, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.11.016 |
| KeyWord:coprecipitation method; lithium iron phosphate; precursor; heat treatment |
| Author | Institution |
| WANG Hua-dan |
昆明理工大学化学工程学院 |
| CHEN Fu-jin |
昆明理工大学化学工程学院 |
| GONG Wei-hua |
昆明理工大学化学工程学院 |
| SU Yi |
昆明理工大学化学工程学院 |
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| Abstract: |
| Lithium iron phosphate precursor was synthesized by coprecipitation method applying ferrous sulfate, phosphoric acid and lithium hydroxide as raw materials. High-rate lithium iron phosphate composite material (LiFePO4/C) was obtained after calcination. Effects of temperature on morphology and electrochemical properties of precursor during calcination were studied. The results show that the output phase calcined at 750 ℃ is lithium iron phosphate with good spherical morphology and has the best electrochemical performance with conductivity of 5.10 S/m, tap density of 1.19 g/cm3, and the first discharge specific capacity of 145.8 mAh/g at 0.1C rate. Its internal resistance is 139.64 Ω, cyclic volt-ampere curve is up and down in symmetrical with good cycle reversibility. |
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