A Facile Carbon Quantum Dot‐Modified Reduction Approach Towards Tunable Sb@CQDs Nanoparticles for High Performance Sodium Storage,Batteries & Supercaps

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A Facile Carbon Quantum Dot‐Modified Reduction Approach Towards Tunable Sb@CQDs Nanoparticles for High Performance Sodium Storage
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-02-04 , DOI: 10.1002/batt.201900167
Fei Liu ₁ , Yaping Wang ₁ , Yifang Zhang ₁ , Jiande Lin ₁ , Qiong Su ₁ , Junrong Shi ₁ , Xuefang Xie ₁ , Shuquan Liang ₁ , Anqiang Pan ₁

Affiliation

Antimony (Sb) has considerable specific capacity as an anode material for sodium‐ion batteries. However, the large volume expansion during alloying/dealloying with Na⁺ leads to poor cycling stability. Herein, we report the synthesis of Sb@carbon quantum dots (Sb@CQDs) composite via a facile one‐step reduction approach at room temperature. CQDs can modify the nucleation and growth of Sb particles during the reduction process and thus tune the size of Sb. Sb@CQDs particles with size of ∼7 nm can relieve the volume expansion and reduce the diffusion distance for sodium ions. Moreover, the residual CQDs in the obtained composite enhance the electronic conductivity. Benefited from the modification of CQDs, the Sb@CQDs composite delivers high specific capacity of 635 mA h g⁻¹ at 0.1 A g⁻¹ and 334 mA h g⁻¹ at 2 A g⁻¹.

中文翻译：

一种适用于可调谐Sb @ CQDs纳米粒子的碳量子点修饰还原方法，用于高性能钠存储

锑（Sb）作为钠离子电池的负极材料具有相当大的比容量。然而，在与Na ⁺合金化/脱合金期间的大体积膨胀导致较差的循环稳定性。在本文中，我们报告了一种在室温下通过简便的一步还原方法合成Sb @碳量子点（Sb @ CQDs）的方法。CQD可以在还原过程中修饰Sb颗粒的形核和生长，从而调节Sb的大小。大小约为7 nm的Sb @ CQDs颗粒可以缓解体积膨胀并减少钠离子的扩散距离。此外，所得复合物中的残留CQD提高了电子导电性。受益于CQD的改性，Sb @ CQDs复合材料在0.1 A g的条件下可提供635 mA h g ^-1的高比容量^-1和334 mA h g ^-1在2 A g ^-1。

更新日期：2020-02-04

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