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Issue 13, 2015
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LiFePO4 nanoparticles growth with preferential (010) face modulated by Tween-80

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Abstract

Small grain size combined with large I(020)/I(111) ratio have been proven to be an effective strategy to improve the electrochemical properties of LiFePO4 material due to increased Li-ion diffusion. In view of this, we use Tween-80 as the surfactant in hydrothermal synthesis to modulate both crystal size and orientation of LiFePO4. It is indicated that the LiFePO4 particles synthesized via the Tween-80 modified hydrothermal method exhibited a small mean diameter of 100 nm and a large I(020)/I(111) ratio of 1.19. Whereas in the surfactant-free hydrothermal system, the obtained LiFePO4 particles exhibit a relatively large mean diameter of 200 nm and a low I(020)/I(111) ratio of 0.84. LiFePO4 particles with small grain size and a large I(020)/I(111) ratio can be easily brought into contact with electrolyte, facilitating electric and Li-ion diffusion. After being coated with conductive carbon, the synthesized LiFePO4/C nanoparticles perform a high Li-ion diffusion coefficient of 1.79 × 10−13 cm2 s−1. It presents a large reversible capacity of 166.5 mA h g−1 at 0.1 C and even a high rate capacity of 119.6 mA h g−1 at 20 C.

Graphical abstract: LiFePO4 nanoparticles growth with preferential (010) face modulated by Tween-80

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Publication details

The article was received on 18 Nov 2014, accepted on 23 Dec 2014 and first published on 05 Jan 2015


Article type: Paper
DOI: 10.1039/C4RA14791J
RSC Adv., 2015,5, 9745-9751

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    LiFePO4 nanoparticles growth with preferential (010) face modulated by Tween-80

    Y. Liu, J. Gu, J. Zhang, F. Yu, J. Wang, N. Nie and W. Li, RSC Adv., 2015, 5, 9745
    DOI: 10.1039/C4RA14791J

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