高電圧リチウム金属電池のための半溶解塩基溶解体

Zhihong Piao¹, Xinru Wu¹, Hong-Rui Ren¹

¹Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.

Journal of the American Chemical Society

|October 27, 2023

まとめ

高圧リチウム金属電池 (LMB) の安定性を高める新しい半溶解単体電解質. この画期的な技術により温度とサイクルを問わず性能が向上しより安全で高エネルギー密度の貯蔵が可能になります

科学分野:

材料科学
電気化学
エネルギー貯蔵

背景:

高電圧のリチウム金属電池 (LMB) は,Ni豊富なカソッドで,エネルギー密度が高いことが不可欠です.
現在の局所化された高濃度電解質 (LHCE) は,良い陽極逆転性を示しているが,熱的および電気化学的な安定性が悪い.

研究の目的:

ローカライズされた高濃度電解質 (LHCE) の溶解構造を設計することによって,高電圧 LMB のための安定した電解質を開発する.
単一の二機能溶媒を用いた従来のLHCEの限界を克服する.

主な方法:

新しい半溶解塩基溶解剤の設計と合成
Li金属アノドとNi豊富なカトドに対する電解質の安定性の電気化学的評価.
異なる温度および電圧条件下でのLiのRadiusNi_0.8Co_0.1Mn_0.1O₂の性能テスト

主要な成果:

設計された電解質は,LHCEの溶解構造を成功裏に模倣し,安定性を高めています.
リチウムデンドライトの増殖抑制,電極の分解 (相変化,マイクロクラッキング),移行金属の溶解.
-20 °Cから60 °Cまでの安定した電池動作で,100サイクル後に95.6%の容量保持,180サイクル後に~80%の容量保持.

結論:

半溶解したソール溶媒の電解質は,高度な電解質工学の新しい戦略を提供します.
このアプローチは,高圧リチウム金属電池の安定性と安全性を大幅に改善します.
次世代の高エネルギー密度エネルギー貯蔵システムの開発を可能にします.

さらに関連する動画

11:04

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

Published on: December 20, 2016

13.0K

10:03

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

Published on: November 11, 2013

25.5K

関連する概念動画

02:21

Electrolyte and Nonelectrolyte Solutions

63.2K

Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.

63.2K

01:12

Solvents

64.7K

A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...

64.7K

02:12

Solvating Effects

7.5K

An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...

7.5K

03:12

Batteries and Fuel Cells

27.6K

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...

27.6K

03:45

Formation of Complex Ions

23.7K

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

23.7K

02:48

Ionic Bonding and Electron Transfer

41.6K

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.