Phase engineering in lead–bismuth system for advanced magnesium ion batteries,Journal of Materials Chemistry A

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Phase engineering in lead–bismuth system for advanced magnesium ion batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-24 , DOI: 10.1039/d0ta03433a
Meijia Song _{1,

2,

3,

4,

5} , Jiazheng Niu _{1,

2,

3,

4,

5} , Hui Gao _{1,

2,

3,

4,

5} , Tianyi Kou _{6,

7,

8,

9} , Zekun Wang _{10,

11,

12,

13,

14} , Zhonghua Zhang _{1,

2,

3,

4,

5}

Affiliation

Rechargeable magnesium ion batteries (MIBs) have aroused great interests, but their development is restrained by the incompatibility of Mg metal anodes with conventional electrolytes. Replacing Mg metal with alloy anodes is a promising strategy to address this incompatibility issue. Based on phase engineering, we designed and fabricated a biphase Pb_0.7Bi_0.3/Bi film by a facile magnetron co-sputtering route. Compared with single-phase Pb, Bi and Pb_0.7Bi_0.3 films, the biphase Pb_0.7Bi_0.3/Bi electrode delivers significantly enhanced cycling stability and rate performance, which could be attributed to the biphase buffer matrix mitigating large volume variations and favorable phase boundaries accelerating Mg²⁺ ion transport. Furthermore, the Mg storage mechanism of Pb_0.7Bi_0.3 and Pb_0.7Bi_0.3/Bi films was investigated using operando X-ray diffraction experiments and density functional theory calculations. More importantly, the biphase Pb_0.7Bi_0.3/Bi electrode exhibits good compatibility with conventional electrolytes like Mg(TFSI)₂.

中文翻译：

先进镁离子电池铅铋系统的相工程

可充电镁离子电池（MIB）引起了人们的极大兴趣，但其发展受到Mg金属阳极与常规电解质不兼容的限制。用合金阳极代替镁金属是解决该不相容性问题的有前途的策略。基于相工程，我们设计了一种方便的磁控共溅射工艺制备了双相Pb _0.7 Bi _0.3 / Bi薄膜。与单相Pb，Bi和Pb _0.7 Bi _0.3薄膜相比，双相Pb _0.7 Bi _0.3薄膜/ Bi电极可显着提高循环稳定性和倍率性能，这可能归因于双相缓冲液基质减轻了大的体积变化和有利的相界，加速了Mg ²⁺离子的迁移。此外，使用操作X射线衍射实验和密度泛函理论计算研究了Pb _0.7 Bi _0.3和Pb _0.7 Bi _0.3 / Bi膜的Mg储存机理。更重要的是，双相Pb _0.7 Bi _0.3 / Bi电极表现出与常规电解质（如Mg（TFSI）₂）的良好相容性。

更新日期：2020-07-14

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