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负度兴奋剂稳定了高性能离子电池的P2型氧化物阴极

Yongcong Huang¹, Shuai Gu², Xin Xu¹

¹Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|March 12, 2025

概括

负度兴奋剂增强了离子电池的阴极稳定性. 这一策略改善了P2型Na0.67Ni0.33Mn0.67O2 (NNMO) 材料的循环寿命和容量保留,使高性能离子电池成为可能.

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:

离子电池 (SIB) 的P2型Na0.67Ni0.33Mn0.67O2 (NNMO) 阴极材料由于循环过程中的结构不稳定性和氧气损失而遭受容量退化.
破坏性的结构演变和不可逆转的氧气损失导致SIBs的容量迅速减少.

研究的目的:

为了提高SIBs的P2型NNMO阴极材料的结构稳定性和电化学性能.
为了研究负力兴奋剂 (NED) 策略改善SIB阴极耐用性的有效性.

主要方法:

通过用Sn,Sb,Cu,Ti,Mg和Zn替换NNMO中的过渡金属位点来开发负度兴奋剂 (NED) 策略.
通过循环测试和电化学性能分析,研究了NED-NNMO的结构和电化学特性.
制造了一种安培时尺度袋式电池,以评估实际性能.

主要成果:

NED-NNMO证明了抑制P2到O2相位过渡和改善Na+动力学,从而提高了循环稳定性.
与原始NNMO相比,合材料表现出更光滑的电压平台和更好的氧氧氧还原可逆性.
在0.1°C时,NED-NNMO提供了138.9mAhg-1的高容量,在1°C时100个循环后保持94.6%,在30°C时3000个循环后保持90.0%.
一个安培时尺度袋式电池实现了139 Wh kg-1的能量密度.

结论:

负度兴奋剂是一种有效的策略,用于设计离子电池的强大和高性能阴极材料.
在SIB中,NED-NNMO阴极为长期循环稳定性和高速率能力提供了一个有前途的解决方案.

关键词:

P2类型的分层氧化物.用于离子电池的阴极.负热兴奋剂是负热兴奋剂.氧气氧化氧化还原反应减少了网格扭曲的发生.

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