Determination of the relationship between particle size and electrochemical performance of uncoated LiFePO4 materials

Research Paper
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Abstract

The current literature generally reports the relationship between particle size and electrochemical performance of carbon-coated LiFePO4 (LFP). However, besides the factor of particle size, the quality of carbon coating will affect the electrochemical performance of LiFePO4 simultaneously. Logistically, each independent equation is solvable when it contains just one variable and is not solvable when it contains two or more variables. Therefore, we decide to study the relationship between particle size and electrochemical performance of uncoated LiFePO4, of which the relevant literature is sparse. To prepare samples within a wide range for average particle sizes, a traditional precipitation approach was employed to prepare the LFP materials with different average particle sizes of 30–500 nm. Carbon-coated LiFePO4 materials were prepared for the purpose of comparison studies. Both pristine LiFePO4 and carbon-coated LiFePO4 were investigated by XRD, FESEM, as well as charge/discharge testing (in the form of coin cells). The details of materials syntheses were discussed. Without the influence of carbon coating, the discharge capacity of pristine LiFePO4 exhibited a “volcano”-type relationship versus the average primary particle size in the size range of 50–500 nm and reaches a maximum value at the optimum size of about 200 nm. This finding may drive the development of power grade LFP cathode nanomaterials toward more precise particle size optimization.

Keywords

Li-ion batteries Cathodes Charging/discharging Materials preparations Energy storage 
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Notes

Acknowledgments

We thank the projects sponsored by Henan Provincial Foundation for University Youth Key Faculty (2013GGJS-112), Henan Provincial Scientific Research Foundation for the Returned Overseas Scholars, Zhengzhou Science & Technology Project (10PTGG381-2), and Research Funding for Ph.D. Faculty of Zhengzhou University of Light Industry.

Supplementary material

11051_2015_2969_MOESM1_ESM.doc (368 kb)
Supplementary material 1 (DOC 367 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.Henan Provincial Key Laboratory of Surface and Interface Science, School of Materials and Chemical EngineeringZhengzhou University of Light IndustryZhengzhouChina

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