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Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

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通过稳定的高压离子电池的Mn Slab定位控制Jahn-Teller扭曲.

Yameng Fan^1,2, Haobo Li³, Xiaobo Zheng⁴

¹Centre for Atomaterials and Nanomanufacturing (CAN), School of Science, RMIT University, Melbourne, VIC 3000, Australia.

|December 31, 2025

概括

富含Mn的层状氧化物中局部化的Jahn-Teller活性Mn3+离子稳定了离子电池阴极. 这种工程材料NCM316显示了增强的循环稳定性和高能量密度,克服了结构退化问题.

关键词:

雅恩 - 泰勒扭曲的扭曲阴极材料的材料是正极材料.有层层的氧化物.离子电池是一种离子电池.结构演化的结构演化.

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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:

富含的分层氧化物对离子电池具有前景,因为其容量,丰富性和成本.
来自Mn3+的Jahn-Teller效应导致晶格扭曲,降低结构和稳定性.
稳定这些材料对于实际的离子电池应用至关重要.

研究的目的:

为了抑制Jahn-Teller诱导的扭曲,富含Mn的层状氧化物.
为了提高这些正极材料的结构完整性和电化学性能.
提出一个用于稳定Jahn-Teller活性材料的设计原则.

主要方法:

在密闭的富含Mn的板块内空间定位Jahn-Teller活性Mn3+离子.
合成和鉴定工程氧化物NaNi_0.3Cu_0.1Mn_0.6O₂ (NCM316) 的特性.
使用同步射线X射线和中子散射,得到理论模拟的支持.

主要成果:

NCM316证明了长距离扭曲的抑制和稳定层次框架.
在200个循环后实现了89.5%的电压保持,在500个循环后实现了84%的容量保持.
在4.4V的切断时,提供了3.36V的高放电电压和337Wh kg-1的能量密度.

结论:

局部Mn3+有效地减轻了Jahn-Teller扭曲,并保持了结构完整性.
与其他基于Mn的分层阴极相比,NCM316具有优越的电化学性能.
拟议的设计原则适用于各种用于储能的Jahn-Teller活性材料.