实现基于石墨的低温可充电离子全电池的实现
Liwei Cheng1, Hao Lan1, Yong Gao2
1School of Chemistry, Beihang University, Beijing, 100191, China.
Angewandte Chemie (International ed. in English)
|December 27, 2023
概括
这项研究为石墨基离子电池引入了一种新型电解质,使其能够在低温下稳定运行. 这一突破解决了关键的挑战,为实际的低温离子电池开发铺平了道路.
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:
- 由于其容量和成本,石墨是离子电池 (PIB) 的有希望的阳极.
- 目前基于石墨的PIB在低温下扎,受到电解质动力学或离子溶剂协同干扰的限制.
- 开发低温兼容的PIB对于更广泛的应用至关重要.
研究的目的:
- 使用石墨阳极开发一种高性能,低温可充电的离子电池.
- 在零度以下的温度下克服传统电解质在石墨基PIB中的局限性.
- 通过电解质工程提高离子电池的工作电压和循环能力.
主要方法:
- 在离子电池中使用基于未识别的溶剂研究了新型电解质化学.
- 在电解质中引入了固体阻碍物,以抑制离子溶剂对石墨的协同插曲.
- 在广泛的温度范围内制造并测试了一种全离子电池电池 (GridiyegadgadKPTCDA).
主要成果:
- 新的电解质显著削弱了K + - 溶剂相互作用,降低了脱溶障碍.
- 立体障碍有效地抑制了协同插曲,改善了工作电压和电池循环能力.
- 基于石墨的离子电池证明了从-30°C到45°C的可逆循环.
- 在-20°C下达到能量密度为197 Wh kg阴极-1.
结论:
- 首次成功实现了一种基于低温石墨的高性能离子电池.
- 电解质设计,特别是使用不相同的溶剂和固态阻碍,是克服低温性能限制的关键.
- 这项工作为低温离子电池的商业化提供了可行的途径.
相关概念视频
03:12Batteries and Fuel Cells
27.4K
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...
27.4K
03:00Electrolysis
26.4K
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...
26.4K
03:06Alkali Metals
19.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
19.3K
03:02Standard Electrode Potentials
43.9K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
43.9K