作为离子电池阳极的多层酸/减少氧化石墨烯纳米复合材料
Charlie A F Nason1, Ajay Piriya Vijaya Kumar Saroja1, Yi Lu1
1Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
Nano-micro letters
|November 6, 2023
概括
这项研究引入酸 (KTNO) 和其减少的氧化石墨烯 (rGO) 复合物作为离子电池 (KIB) 的高性能阳极. KTNO/rGO材料表现出极好的循环稳定性和速度性能,使其成为KIB的有希望的替代阳极.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 石墨占据了离子电池 (KIB) 阳极的主导地位,使其他材料未得到充分探索.
- 过渡金属氧化物提供了诸如合成成熟度和稳定性等优势,但需要对KIB应用进行进一步的研究.
研究的目的:
- 为了解决KIB阳极材料的研究缺口.
- 合成和评估一个分层酸 (KTiNbO5,KTNO) 和其减少的氧化石墨烯 (rGO) 纳米复合物 (KTNO/rGO) 作为KIBs的高性能阳极.
主要方法:
- KTNO/rGO纳米复合材料的溶热合成.
- 电化学性能测试,包括循环稳定性和速率能力.
- 现场X射线衍射 (XRD) 和现场X射线光电子光谱 (XPS) 用于材料表征和机制研究.
主要成果:
- 由于在导电性rGO上有效分布,KTNO/rGO纳米复合材料表现出增强的电化学性能.
- 在20 mA g-1 (容量保留76.1%) 的500个循环后,实现了128.1 mAh g-1的首次充电容量和97.5 mAh g-1的可逆容量.
- 证明了54.2mAhg-1在1Ag-1的异常速率性能,并确定了比更大的氧化还原可逆性.
结论:
- KTNO/rGO是高性能KIB的有前途的阳极材料.
- 据现场XRD证明,KTNO的低应变性质是其关键优势属性.
- 为了推进KIB技术,对基于KTNO的材料进行进一步的研究是有必要的.
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