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在LiFePO中加速离子扩散₄由Polyanion格子工程

Xinxin Wang¹, Anyang Yu², Tian Jiang³

¹School of Physics, Jiulonghu Campus, Southeast University, Nanjing, 211189, China.

Advanced materials (Deerfield Beach, Fla.)

|October 10, 2024

概括

研究人员通过修改铁酸盐 (LiFePO4) 阴极来提高离子电池的性能. 用酸盐离子取代酸盐,创造了更灵活的离子扩散通路,改善了充电和放电率.

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
固态化学固态化学

背景情况:

铁酸盐 (LiFePO4) 是用于离子电池的广泛商业化的正极材料.
其刚性的一维离子扩散通道限制了快速充电和放电的能力.
提高LiFePO4中的离子流动性对于高功率电池应用至关重要.

研究的目的:

为了提高 LiFePO4 阴极的速率性能和循环稳定性.
为了设计网格灵活性和扩大离子扩散通路.
为了研究酸盐替代对LiFePO4电化学性质的影响.

主要方法:

通过将四面体PO4(3-) 替换为平面三角形BO3(3-) 组来进行格子工程.
合成和表征LiFe的材料{}PO4{}{}0.98{}BO3{}0.02{}) 的材料.
电化学测试,包括高速容量测量和在各种温度下长期循环稳定性分析.

主要成果:

经过修改的LiFe ((PO4) ((0.98) ((BO3) ((0.02)) 显示出显著改善的离子扩散通道.
在50°C时达到66.8mAhg{-1}的高速率容量,在25°C时在10°C时实现超低容量损失 (每周期0.003%).
在-20°C下表现出极好的性能,在40°C下表现出34.0mAhg-1,在10°C下2500个循环后没有容量损失.

结论:

平面酸盐替代有效地提高 LiFePO4 阴极性能,通过增加通道灵活性和引入额外的扩散路径.
改性材料显示出优越的高速率能力和长期循环稳定性,即使在零度以下的温度下.
这种方法为开发具有更高功率密度和耐久性的先进离子电池提供了有前途的战略.

关键词:

LiFePO4 的使用情况.离子扩散是离子扩散的方法.格子工程格子工程聚离子替代的替代方法

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