相关实验视频

Updated: May 15, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Published on: November 11, 2013

关于LiCoO₂的大大改善的高压循环性能,通过从O₃到O₂的相位改变结构

Mingwei Zan^1,2, Hongsheng Xie^1,2, Sichen Jiao^1,2

¹Beijing Frontier Research Center on Clean Energy Institute of Physics Chinese Academy of Sciences Beijing 100190 China.

|April 11, 2025

概括

与O3相相比,氧化 (LiCoO) 的O2相表现出优越的高压稳定性,为先进的离子电池提供了有前途的途径. 这种增强的性能与改进的离子扩散和机械完整性有关.

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:

氧化 (LiCoO) 是离子电池的关键阴极材料,因其高体积能量密度而受到重视.
在LiCoO_{2_{中普遍存在的O_{3阶段,由于相变和电解质反应,在高电压 (>4.55V) 上运行时表现出不良的稳定性和快速容量衰减.}}}
具有不同的原子堆叠的LiCoO₂的O_{2相较少被探索,特别是关于其高压性能.}

研究的目的:

系统地比较O₂-LiCoO₂与传统O₃-LiCoO₂相的高压电化学性能.
阐明在高工作电压下造成稳定性差异的潜在机制.

主要方法:

在高电压 (>4.5V) 下对O₃和O₂ LiCoO₂相进行电化学性能测试.
使用各种表征技术来分析材料特性.
采用多尺度模拟来理解结构和离子运输行为.

主要成果:

与O₂-LiCoO₂相比,O₃-LiCoO₂在高电压 (>4.5V) 循环时表现出显著增强的稳定性和容量保留,即使具有类似的微型粒子形态.
O₂-LiCoO₂的优越性能归因于其更高的离子 (Li⁺) 扩散性和更有利的机械性能.
特性和模拟数据表明,均的Li+分布和平衡的内部应力是高压稳定性的关键因素.

结论:

在高压离子电池应用中,LiCoO₂的O_{2阶段为O_{3阶段提供了更强大的替代方案.}}
优化Li+分布和管理内部压力是改善LiCoO2基阴极高压性能的关键策略.
这项研究为设计下一代高能量密度离子电池开辟了新的途径.

关键词:

O2 阶段 O2 阶段化学机械学化学机械学的高压性能.氧化和的氧化物.离子电池的离子电池

更多相关视频

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation

The Effect of Charging and Discharging Lithium Iron Phosphate-graphite Cells at Different Temperatures on Degradation

Published on: July 18, 2018

相关概念视频

LC Circuits

LC Circuits

An LC circuit consists of an inductor and a capacitor, either in series or parallel. Consider a charged capacitor connected with an inductor in series. Before the switch is closed, all the energy of the circuit is stored in the electric field of the capacitor. When the switch is closed, the capacitor begins to discharge, producing a current in the circuit. The current, in turn, creates a magnetic field in the inductor. Because of the induced emf in the inductor, the current cannot change...

Voltage Doubler Circuit

Voltage Doubler Circuit

A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.

MOS Capacitor

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

MOSFET

MOSFET

The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...

MOSFET: Enhancement Mode

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...

Characteristics of MOSFET

Characteristics of MOSFET

Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...