使用氧化形成的双化层,用于提高电极的储存性能,循环稳定性和安全性
Rahmandhika Firdauzha Hary Hernandha1, Bharath Umesh1, Jagabandhu Patra1,2
1Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, 1001 University Road, Hsinchu, 30010, Taiwan.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|April 24, 2024
概括
氧化 (NO) 处理在阳极上产生化 (SiNx) ,大大提高了的储存能力和稳定性. 这种方法还通过抑制电池运行期间的外热反应来提高热安全性.
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:
- 阳极为离子电池提供了高的理论容量,但其循环稳定性和体积膨胀不佳.
- 兴奋剂是一种有前途的策略,通过提高导电性和结构完整性来提高阳极性能.
- 现有的化方法在实现均的兴奋剂和核心透方面面临挑战,特别是保护性涂层.
研究的目的:
- 开发一种高效且可扩展的化方法,用于使用氧化 (NO) 的阳极.
- 研究核心外Si@SiNx结构的形成及其对电化学性能的影响.
- 评估安全方面,特别是在热失控过程中抑制外热反应.
主要方法:
- 使用胺,尿素和氧化 (NO) 前体化的颗粒.
- 对化方法的比较分析,重点是对裸体Si颗粒的NO处理.
- 通过NO处理产生的核心外Si@amorphousSiNx颗粒的表征,检查反应时间的影响.
- 处理后涂层Si@SiNx颗粒与添加碳.
- 电化学测试 (电荷-放电循环) 和差分扫描热量计 (DSC) 用于热分析.
主要成果:
- NO处理有效化,最大限度地提高石墨含量和电子导电性.
- 核心外Si@形态SiNx结构的形成增强了电解质的湿透性和结构稳定性.
- 优化的Si@SiNx阳极表现出优越的存储容量 (2435 mAh g−1在0.2 A g−1,1280 mAh g−1在5 A g−1).
- 观察到高容量保留 (在300个循环后90%),并且在热失控期间显著抑制了外热反应.
结论:
- 简单可扩展的NO处理是一种高效的方法,用于制造先进的离子阳极的Si@SiNx核心外结构.
- 化过程提高了电化学性能,包括容量和循环稳定性.
- 开发的化策略提高了阳极的热安全性,这对于实际的电池应用至关重要.
相关概念视频
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
1.9K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
1.9K
2° Amines to N-Nitrosamines: Reaction with NaNO2
3.9K
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
3.9K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
3.3K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.3K
MOS Capacitor
1.8K
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...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
1.8K
The Electrical Double Layer
241
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
241


