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

机译：通过Tween-80调节优先（010）面的LiFePO4纳米颗粒生长

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摘要

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 x 10(-13) cm(2) 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.
机译：事实证明，小晶粒尺寸与大I-（020）/ I-（111）比率相结合是提高LiFePO4材料电化学性能的有效策略，原因是Li离子扩散增加。有鉴于此，我们在水热合成中使用Tween-80作为表面活性剂来调节LiFePO4的晶体尺寸和取向。结果表明，通过吐温80改进的水热法合成的LiFePO4颗粒的平均直径小，为100 nm，I-（020）/ I-（111）之比为1.19。而在无表面活性剂的水热体系中，所获得的LiFePO 4颗粒具有相对较大的200nm平均直径和低的I-（020）/ I-（111）比，为0.84。具有小的晶粒尺寸和大的I-（020）/ I-（111）比的LiFePO4颗粒可以很容易地与电解质接触，从而促进电和锂离子的扩散。涂覆导电碳后，合成的LiFePO4 / C纳米颗粒具有1.79 x 10（-13）cm（2）s（-1）的高Li离子扩散系数。它在0.1 C时具有166.5 mA h g（-1）的大可逆容量，在20 C时甚至具有119.6 mA h g（-1）的高倍率容量。

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