相关实验视频

Updated: May 9, 2025

$In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries$

In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries

Published on: November 10, 2014

交叉连接的异质链聚合物介面使丰富的基金属电池能够稳定循环运行

Wen-Hui Hou¹, Qingqing Feng², Cheng Liu³

¹Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.

Advanced materials (Deerfield Beach, Fla.)

|May 6, 2025

概括

研究人员为丰富的基层氧化物 (LRMO) 阴极开发了一种新的保护层,显著提高了电池的寿命和稳定性,特别是在高能量密度应用中.

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
电池技术电池技术

背景情况:

富基层氧化物 (LRMO) 提供高能量密度,但受到电解质消耗和容量衰减的影响.
现有的正极电解质介相 (CEI) 策略不足以满足LRMO独特的结构需求.

研究的目的:

为了确定对LRMO阴极的具体CEI要求.
设计一种新的CEI战略,以提高LRMO电池的性能和稳定性.

主要方法:

开发一种非化添加剂,即2,4,6-三-2,4,6-三甲基环三素 (TVTMS).
通过环开聚合和乙烯交联,形成一个交联的异质链聚合物CEI (CHP-CEI).
使用单颗粒气溶质谱法 (SPAMS) 来分析CEI组件.

主要成果:

与传统添加剂相比,新型CHP-CEI表现出优越的稳定性,灵活性和能量消耗.
有效缓解LRMO阴极裂解,气体演变和过渡金属溶解.
在Li HDLRMO电池中实现了>825个循环,剩余容量为204mAhg-1.
高负荷阴极 (12 mg cm-2) 在 >145个循环中保持了80%的容量.

结论:

设计的CHP-CEI有效地解决了LRMO阴极的限制,提高了循环寿命和稳定性.
TVTMS为下一代高能量密度电池提供了一个有前途的解决方案.
该研究表明,SPAMS对于CEI组件分析的实用性.

关键词:

基于丰富的Mn阴极.超高电压的超高电压异质链聚合物相间相.非化电解质非化电解质

更多相关视频

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

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

相关概念视频

Anionic Chain-Growth Polymerization: Mechanism

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...

Anionic Chain-Growth Polymerization: Overview

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

Cationic Chain-Growth Polymerization: Mechanism

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...

Batteries and Fuel Cells

Batteries and Fuel Cells

A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...