Carbon quantum dot modified Na3V2(PO4)2F3 as a high-performance cathode material for sodium-ion batteries,Journal of Materials Chemistry A

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Carbon quantum dot modified Na3V2(PO4)2F3 as a high-performance cathode material for sodium-ion batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-05 , DOI: 10.1039/d0ta04307a
Shengyuan Liu _{1,

2,

3,

4,

5} , Xinxin Cao _{1,

2,

3,

4,

5} , Yangpu Zhang _{1,

2,

3,

4,

5} , Ke Wang _{1,

2,

3,

4,

5} , Qiong Su _{1,

2,

3,

4,

5} , Jing Chen _{1,

2,

3,

4,

5} , Qiong He _{1,

2,

3,

4,

5} , Shuquan Liang _{1,

2,

3,

4,

5} , Guozhong Cao _{6,

7,

8,

9} , Anqiang Pan _{1,

2,

3,

4,

5}

Affiliation

Sodium-ion batteries (SIBs) are broadly regarded as a promising alternative to lithium-ion batteries (LIBs) for application in grid-scale energy storage because of abundant resources and the low cost of sodium. Nevertheless, there still exist some challenges, including low energy density, unsatisfactory cycling stability, and sluggish ion transfer. Herein, carbon quantum dot modified Na₃V₂(PO₄)₂F₃ (NVPF@CQD) hierarchical microspheres were fabricated via a one-step solvothermal strategy followed by heat treatment. Furthermore, we systematically investigated how the solvothermal reaction time and content of carbon quantum dots influence the crystal structure, morphology and electrochemical performance, thereby obtaining the optimized final product. Impressively, the NVPF@CQD electrode presents awesome rate capability with a discharge capacity of 105.1 mA h g⁻¹ at 20C, i.e., 83% retention of its capacity at 0.2C. When cycled at a rate of 30C, the capacity retention is 90.2% after 6000 cycles, corresponding to a capacity fading of 0.0017% per cycle. Moreover, for practical applications, a sodium-ion full-cell configuration is constructed using the NVPF@CQD cathode and a commercial hard carbon anode exhibiting a high operating voltage and impressive cycling stability at 500 mA g⁻¹.

中文翻译：

碳量子点修饰的Na3V2（PO4）2F3作为钠离子电池的高性能阴极材料

钠离子电池（SIB）被广泛认为是锂离子电池（LIB）的有前途的替代品，因为它具有丰富的资源和钠的低成本，因此可用于电网规模的储能。然而，仍然存在一些挑战，包括低能量密度，不令人满意的循环稳定性和缓慢的离子转移。本文中，通过以下步骤制备了碳量子点修饰的Na ₃ V ₂（PO ₄）₂ F ₃（NVPF @ CQD）分级微球。一步溶剂热策略，然后进行热处理。此外，我们系统地研究了溶剂热反应时间和碳量子点的含量如何影响晶体结构，形态和电化学性能，从而获得优化的最终产物。令人印象深刻的NVPF @ CQD电极礼物真棒速率能力与105.1毫安汞柱的放电容量^-1在20℃，即，其在0.2C时的容量保留率达83％。当以30℃的速率循环时，在6000次循环后容量保持率为90.2％，对应于每循环0.0017％的容量衰减。此外，对于实际应用，使用NVPF @ CQD阴极和商用硬碳阳极构造钠离子全电池配置，该阳极在500 mA g ^-1时表现出高工作电压和令人印象深刻的循环稳定性。

更新日期：2020-09-22

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