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在分层过渡金属氧化物阴极的烧结过程中的相位过渡

Fangbo Ma¹, Hao Chen¹, Hu Wu¹

¹State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

|May 27, 2025

概括

前体形态极大地影响离子电池的阴极性能. 正规的前体产生均的扩散和优越的电化学特性,与不规则的不同.

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:

层状阴极是离子电池 (SIB) 的关键.
了解烧结过程中的结构演变对于SIB阴极开发至关重要.
前体材料形态在SIB阴极合成中的作用尚未完全理解.

研究的目的:

研究前体形态对O3-NaNi0.4Fe0.2Mn0.4O2阴极的结构演变和电化学性能的影响.
阐明SIB阴极合成过程中前体结构和相变动态之间的关系.

主要方法:

在相同的化条件下,从不规则和规则的前体合成O3-NaNi0.4Fe0.2Mn0.4O2阴极.
综合结构和电化学分析.

主要成果:

不规则的前体导致异质Na+扩散,形成岩盐相核心和R3̅m外,导致相变和孔隙.
常规的准球形前体使Na+扩散均,促进了最佳的相位演变.
来自常规前体的阴极表现出优越的电化学性能.

结论:

前体形态显著决定了固态化过程和分层SIB阴极的相位演变.
对前体形态的合理设计对于开发高性能SIB阴极至关重要.
这项研究为优化离子电池的分层阴极合成提供了见解.

关键词:

O3类型的分层氧化物.阶段过渡阶段过渡阶段过渡先行者形态学的前身离子电池是一种离子电池.

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相关概念视频

Properties of Transition Metals

Properties of Transition Metals

Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

Bonding in Metals

Bonding in Metals

Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.