通过在氧化中触发阳离子氧化活动来实现高容量的阴极前剂
Yilong Chen1,2, Yuanlong Zhu1, Zhefei Sun3
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Advanced materials (Deerfield Beach, Fla.)
|July 20, 2024
概括
像Ni-Na2O这样的牺牲性阴极预剂,可以弥补离子电池中的损失. 这种Ni-Na2O剂在完整的细胞中增加了23%以上的能量密度.
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:
- 离子电池 (SIB) 由于不可逆转的损失,特别是硬碳阳极,在能量密度方面面临挑战.
- 牺牲性阴极预剂通过提供额外的源提供解决方案.
- 在预化剂中的阳离子氧化活性是高容量和高效的补偿的关键.
研究的目的:
- 为SIBs开发一种新的牺牲性阴极预剂.
- 通过补偿损失,提高SIB全细胞的能量密度.
- 阐明氧化在预化剂中的氧化机制.
主要方法:
- 一种改性氧化 (Ni-Na2O) 前化剂的合成.
- 对Ni-Na2O的电化学表征,以其预化能力和分解潜力.
- 使用Ni-Na2O与Na3V2(PO4)3和Na2/3Ni2/3Mn1/3O2阴极制造和测试SIB全电池.
主要成果:
- Ni-Na2O中的Ni原子激活氧离子氧化,使其具有710 mAh/g的高预化能力.
- Ni-Na2O的过分解电位降低到了2.8V (vs Na/Na+).
- 结合Ni-Na2O的SIB全电池显示了23.9%和19.3%的显著能量密度改善.
结论:
- 开发的Ni-Na2O作为SIBs的有效牺牲前剂.
- 这项研究揭示了结构-功能关系,控制了氧化机制在预化剂.
- 这项工作为设计先进的预化剂以提高SIB性能提供了一个范例.
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