对先进的纳西康-Na4Fe3(PO4) 2P2O7阴极的阳离子替代策略用于离子电池
Xiaochen Ge1, Liang He1, Chaohong Guan2
1School of Metallurgy and Environment, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha 410083, PR China.
ACS nano
|December 29, 2023
概括
研究人员开发了一种新的正极材料,NASICON-Na4Fe3(PO4)1.9(SiO4) 0.1P2O7 (NFPP-Si0.1),用于高级离子电池 (SIB). 这种材料提供了增强的容量,耐用性和在低温下出色的性能.
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:
- 优质的离子电池 (SIB) 需要先进的阴极材料,具有更好的容量和耐用性.
- 当前的阴极材料在充电/放电率和长期稳定性方面经常面临限制.
研究的目的:
- 设计和合成一种新型的阴极材料用于SIB,使用阴离子组替代策略.
- 研究SiO4(4-) 替代对NASICON类型材料结构和电化学性能的影响.
主要方法:
- 使用阳离子组替代策略来合成纳西康-Na4Fe3(PO4)1.9(SiO4) 0.1P2O7 (NFPP-Si0.1).
- 进行了实验和理论研究,包括电化学性能测试 (速率能力,循环稳定性,低温性能).
主要成果:
- 由于优化电子导电性和减少Na+扩散能量障碍,NFPP-Si0.1表现出显著提升的离子/电子转移动力学.
- 该材料表现出高速率 (77.6 mAh g-1在50°C),优异的可回收性 (79.4%在10°C的7000个循环后保留),以及出色的低温性能 (95.5 mAh g-1在0.1°C,-10°C).
- SiO4(4-) 替代导致晶格扩张,扩大Na+扩散通道.
结论:
- 离子组替代策略在开发SIBs的高性能阴极材料方面是有效的.
- 作为高速率,长寿命和低温SIB应用的阴极材料,NFPP-Si0.1显示出巨大的潜力.
- 这种方法为设计先进的混合聚离子阴极提供了一条途径.
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