A flexible hard carbon microsphere/MXene film as a high-performance anode for sodium-ion storage
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摘要: 硬炭被认为是钠离子电池最有前景的负极材料,但在嵌钠/脱钠过程中的体积变化限制了硬炭的循环寿命。本文构建了一种无黏结剂、集流体的硬炭微球/MXene薄膜电极,并对其钠离子的存储性能进行了研究。以山西老陈醋为液相碳源,制备了单分散的硬炭微球(HCS)。利用二维Ti3C2Tx MXene纳米片作为多功能导电黏结剂制备了柔性薄膜电极。值得注意的是,受益于三维导电网络,Ti3C2Tx构建的薄膜电极具有346 mAhg−1的高比容量,优异的倍率性能和超过1000次的优异循环稳定性。如此优异的电化学性能表明该薄膜有望成为一种非常有前景的下一代柔性钠离子电池的负极。Abstract: Hard carbon is considered the most promising anode material for sodium-ion batteries, but its volume change during sodiation/desodiation limits its cycle life. Hard carbon microspheres (HCSs) with no binder were composited with a MXene film to form an electrode and its sodium storage properties were studied. The microspheres were prepared using Shanxi aged vinegar as a liquid carbon source. Two-dimensional Ti3C2Tx MXene (T is a functional group) was used as a multifunctional conductive binder to fabricate the flexible electrodes. Remarkably, because of the three-dimensional conductive network, the HCS/Ti3C2Tx film electrode has a high capacity of 346 mAh g−1, excellent rate performance and outstanding cycling stability over 1 000 cycles. This remarkable electrochemical performance indicates that the flexible film is a very promising anode for next-generation sodium-ion batteries.
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Key words:
- Sodium-ion batteries /
- Hard carbon microspheres /
- MXene /
- Anode /
- Flexibility
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Figure 4. Na-storage behavior of HCS/MX film electrodes. (a) CV curves for initial three cycles of HCS-1400 and (b) HCS/MX-2 film. (c) Charge/discharge performance at 30 mA g−1. (d) Rate capability and (e) cycle performance at 200 mA g−1 for all the film electrodes. (f) Cycling stability of HCS/MX-2 film at 500 mA g−1
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