一种非缩的梯度溶解电解质使 447.6 Wh Kg-1 的高压金属电池成为可能
Hao Wang1,2, Dong Yan1, Hongyu Liu1
1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 610054, China.
Advanced materials (Deerfield Beach, Fla.)
|June 26, 2025
概括
研究人员开发了一种用于高压金属电池 (LMB) 的新型渐变溶解电解质. 这种新的电解质提高了稳定性和性能,使先进电池应用的寿命更长,能量密度更高.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高压金属电池 (LMB) 对于高能量密度应用至关重要.
- LMB中的电解质不稳定导致速度性能差和周期寿命短.
- 开发稳定的电解质是释放LMBs潜力的关键.
研究的目的:
- 设计和合成一种用于高压LMB的新型非缩梯度溶解电解质.
- 研究溶剂极性的对电解质结构和离子运输的影响.
- 为了评估NCM811手机电池中开发的电解质的电化学性能和稳定性.
主要方法:
- 使用溶剂极性差异 (以太核,碳酸) 制造渐变溶解电解质.
- 电化学表征包括高压稳定性测试 (4.6V与Li/Li+).
- 在各种条件下对LiNi0.8Co0.1Mn0.1O2 (NCM811) 电池的性能评价,包括瘦电解质.
主要成果:
- 梯度溶解电解质表现出高氧化电压和快速的+溶解动力学.
- 在5°C时,NCM811的RadikalysisLi电池表现出165.8mAhg-1的特异容量,在1°C/3°C时表现出1000个稳定周期 (66%的保留率).
- 在精益电解质条件下 (N/P=1.5),细胞在100个周期内保持97.5%的容量;3.2 Ah袋式电池达到447.6 Wh kg-1的能量密度.
结论:
- 开发的梯度溶解电解质有效地解决了高压LMB中的电解质不稳定性.
- 这种电解质设计促进了优越的速率能力,循环寿命和能量密度.
- 梯度溶解电解质对下一代高压储能系统显著有前途.
更多相关视频
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
13.1K
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.6K
相关概念视频
Batteries and Fuel Cells
28.0K
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...
28.0K
Electrolyte and Nonelectrolyte Solutions
64.1K
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.
64.1K
What is an Electrochemical Gradient?
114.7K
Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
114.7K
Concentration Cells
23.3K
A concentration cell is a type of a voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
Consider the following voltaic cell:
Consider the following voltaic cell:
23.3K
Electrolysis
27.3K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
27.3K
Electrolytes: van't Hoff Factor
34.0K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
34.0K
