LiF对非晶纳米/微Ce2Mg17/Ni复合电极合成及电化学稳定性的双重影响

IF 3.2 3区 化学 Q2 CHEMISTRY, PHYSICAL
Zhuocheng Liu, Qilong Fan, Yiming Li*, Boshuo Wang, Fei Ruan, Ming Zhao and Fei Yang*, 
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引用次数: 0

摘要

非晶纳米/微结构稀土(RE)- mg基合金具有优异的储氢能力和充放电动力学。然而,精确控制成分以确保形成具有精细分散的非晶或纳米/微相的均匀微观结构仍然具有挑战性。同时,纳米和微型Mg颗粒在碱溶液中的快速腐蚀降低了电池的寿命。因此,采用LiF催化剂来提高电极合金的耐腐蚀性。随后,基于扩展的Miedema热力学理论进行了模拟计算。计算结果表明,为了保证非晶态焓ΔHamor≤0,非晶态与固态之间的焓差|ΔHsolm - ΔHamor|≤5是成功形成非晶态相的必要条件。此外,Li浓度和相应的焓差的最佳范围分别为3-5 wt %和- 4.55和- 4.41 kJ/mol。在此基础上,通过机械球磨法制备了Ce2Mg17/Ni (1:1) + x wt % LiF (x = 0,1,3,5和10)复合电极材料,结果表明,3 wt % LiF的Ce2Mg17/Ni(1:1)复合材料具有最佳的放电容量(526.22 mAh·g-1)。显微组织观察结果表明,LiF有效地抑制了裂纹沿晶界的扩展。这些实验结果与我们的理论预测一致。因此,本研究结果可为今后开发新型ce - mg基电极合金提供参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dual Effects of LiF on Enhancing the Synthesis and Electrochemical Stability of Amorphous Nano/Micro Ce2Mg17/Ni Composite Electrodes

Dual Effects of LiF on Enhancing the Synthesis and Electrochemical Stability of Amorphous Nano/Micro Ce2Mg17/Ni Composite Electrodes

Amorphous nano/microstructured rare earth (RE)-Mg-based alloys exhibit outstanding hydrogen storage capacity and charge–discharge kinetics. However, precisely controlling the composition to ensure the formation of a uniform microstructure with finely dispersed amorphous or nano/micro phases remains challenging. Simultaneously, the rapid corrosion of nano- and microsized Mg particles in an alkali solution reduces the battery lifespan. Therefore, a LiF catalyst was used to enhance the corrosion resistance of the electrode alloy. Subsequently, a simulation calculation was performed based on the extended Miedema thermodynamic theory. The calculation results show that to ensure ΔHamor ≤ 0 for amorphous enthalpy, the enthalpy difference between the amorphous and solid states |ΔHsolm – ΔHamor| ≤ 5 is essential for the successful formation of amorphous phases. Moreover, the optimal ranges for Li concentration and corresponding enthalpy differences were determined as 3–5 wt % and −4.55 and −4.41 kJ/mol, respectively. Based on the simulation results, Ce2Mg17/Ni (1:1) + x wt % LiF (x = 0, 1, 3, 5, and 10) composite electrode materials were prepared through mechanical ball-milling, with the results revealing that the Ce2Mg17/Ni (1:1) composite material with 3 wt % LiF exhibits the best discharge capacity (526.22 mAh·g–1). The microstructural observation results indicated that LiF effectively inhibited the propagation of cracks along the grain boundaries. These experimental findings were consistent with our theoretical predictions. Hence, the findings of this study may serve as a reference for future development of novel Ce–Mg-based electrode alloys.

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来源期刊
The Journal of Physical Chemistry C
The Journal of Physical Chemistry C 化学-材料科学:综合
CiteScore
6.50
自引率
8.10%
发文量
2047
审稿时长
1.8 months
期刊介绍: The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.
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