Heterojunction-structured MnCO3@NiO composites and their enhanced electrochemical performance,Dalton Transactions

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Heterojunction-structured MnCO3@NiO composites and their enhanced electrochemical performance
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-09-24 , DOI: 10.1039/d0dt02780d
Zexian Zhang _{1,

2,

3,

4,

5} , Tao Mei _{1,

2,

3,

4,

5} , Kai Yang _{1,

2,

3,

4,

5} , Jing Li _{1,

2,

3,

4,

5} , Zhi Tao _{1,

2,

3,

4,

5} , Yuting Xiong _{6,

7,

8,

9} , Liangbiao Wang _{6,

7,

8,

9}

Affiliation

The conductivity and stability of materials have always been the main problems hindering the development of lithium-ion battery applications. Here, we successfully construct MnCO₃@NiO composites with unique heterogeneous structure via the epitaxial growth of porous NiO nanosheets (thickness: ∼125 nm) on MnCO₃ microspheres (diameter: ∼3 μm) to be the anode of lithium-ion batteries. The synergistic effect provided by this special heterogeneous structure effectively improves the electrochemical kinetics, specific surface area as well as structural stability of the composites, finally resulting in predictable enhanced comprehensive electrochemical performance. The electrochemical results show that the MnCO₃@NiO composites exhibit a reversible discharge capacity of 624 mA h g⁻¹ at a current density of 1.0 A g⁻¹ up to 300 cycles.

中文翻译：

异质结结构的MnCO3 @ NiO复合材料及其增强的电化学性能

材料的导电性和稳定性一直是阻碍锂离子电池应用发展的主要问题。在这里，我们通过在MnCO ₃微球（直径：〜3μm ）上外延生长多孔NiO纳米片（厚度：〜125 nm）作为锂离子电池的阳极，成功构建了具有独特异质结构的MnCO ₃ @NiO复合材料。这种特殊的异质结构提供的协同效应有效地改善了复合材料的电化学动力学，比表面积以及结构稳定性，最终导致可预测的综合电化学性能增强。电化学结果表明，MnCO ₃NiO复合材料在300 A循环下在1.0 A g ^-1的电流密度下表现出624 mA hg ^-1的可逆放电容量。

更新日期：2020-10-12

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