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The Electrical Double Layer

The Electrical Double Layer

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...

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Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing

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机械上坚固的双层固体电解质间相,由高性能微型SiO_x阳极的顺序分解机制启用.

Yiming Zhou¹, Xiande Fang¹, Baiheng Li²

¹College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, China.

Angewandte Chemie (International ed. in English)

|October 17, 2025

概括

这项研究引入了用于阳极的新型电解质添加剂,创建了强大的双层固体电解质介相 (SEI),以防止容量衰减. 这种具有成本效益的解决方案提高了基于的阳极的电池寿命和性能.

关键词:

比莱尔固体电解质相间阶段电解质添加剂是一种电解质添加剂.富含3PO4的3PO4是一种富含3PO4的化合物.微米大小的SiOx阳极是微米大小的.三甲基酸盐的三甲基酸盐是什么

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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:

微米大小的 (Si) 基材料为电池阳极提供高容量和低成本.
在化过程中严重的体积膨胀会对固体电解质介相 (SEI) 造成机械应力,导致容量过早衰减.
现有的SEI监管策略往往会损害可制造性和成本.

研究的目的:

为基于Si的阳极开发一种新的,低成本的电解质添加剂.
设计一个强大的双层SEI,具有高Li+导电性,以减轻体积膨胀和提高循环寿命.
为了提高基于Si的阳极在储能应用中的稳定性和性能.

主要方法:

使用了一种新型的电解质添加剂BE-TF,该添加剂由3重%的三甲基酸盐 (TMP) 和5重%的乙烯碳酸盐 (FEC) 在碳酸盐电解质中组成.
使用顺序分解机制生成了双层SEI架构.
使用微米大小的SiOx阳极和工业级袋式电池评估了电化学性能.

主要成果:

BE-TF电解质成功生成了双层SEI,其中内层富含LiF,外层富含Li3PO4.
设计的SEI有效地抑制了体积膨胀,并保护颗粒免受有害的副作用反应.
使用BE-TF电解质的微米大小的SiOx阳极在1 A g-1.1的200个循环后显示出88%的容量保留.
一个3.5阿赫的NCM存储器Gr-微米大小的SiOx袋式电池在3C充电速率下1000个循环后保持了超过81%的容量保留.

结论:

新的BE-TF电解质添加剂提供了一种成本效益高的策略,用于构建基于Si的阳极的强大的双层SEI.
这种方法显著提高了基于Si的阳极的循环寿命和容量保留,解决了它们应用中的关键挑战.
开发的电解质显示了工业级电池电池的长期稳定性的承诺,为先进的能源存储解决方案铺平了道路.