General Method of Manipulating Formation, Composition, and Morphology of Solid-Electrolyte Interphases for Stable Li-Alloy Anodes,Journal of the American Chemical Society

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General Method of Manipulating Formation, Composition, and Morphology of Solid-Electrolyte Interphases for Stable Li-Alloy Anodes
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-11-17 00:00:00 , DOI: 10.1021/jacs.7b07584
Yue Gao ₁ , Ran Yi ₂ , Yuguang C. Li ₁ , Jiangxuan Song _{2,

3} , Shuru Chen ₂ , Qingquan Huang ₂ , Thomas E. Mallouk ₁ , Donghai Wang ₂

Affiliation

Li-alloy-based anode materials are very promising for breaking current energy limits of lithium-ion battery technologies. Unfortunately, these materials still suffer from poor solid-electrolyte interphase (SEI) stability, resulting in unsatisfied electrochemical performances. The typical SEI formation method, electrochemical decomposition of electrolytes onto the active material surface, lacks a deliberate control of the SEI functions and structures. Here we propose a general method of manipulating the formation process, chemical composition, and morphology of the SEI for Li-alloy anodes, using Si and Ge nanoparticle anodes as the platform. The SEI was fabricated through a covalent anchoring of multiple functional components onto the active material surface, followed by electrochemical decomposition of the functional components and conventional electrolyte. Click reaction, serving as the covalent anchoring approach, allows an accurate control of the SEI composition and structure at the molecular level through tuning the chemical structure and amount of variety of functional components and provides an intimate contact between the SEI and the Li-alloy material surface contributed by the covalent bonding. The optimized Si nanoparticle SEI, functionalized by a unique combination of diverse components and containing a high concentration of organic components attributed to the preanchored functional components, presented a stable composition and durable morphology during cycling and led to an improved first cycle efficiency of Si nanoparticle anodes and its long cycle life in a full cell. This general method displays potential benefits to construct stable SEIs for other Li-alloy anodes.

中文翻译：

稳定锂合金阳极的固体电解质中间相的形成，组成和形态的一般方法

基于锂合金的负极材料对于突破锂离子电池技术的当前能量极限非常有前途。不幸的是，这些材料仍然遭受不良的固体电解质间相（SEI）稳定性，导致电化学性能不令人满意。典型的SEI形成方法，即电解质在活性材料表面上的电化学分解，缺乏对SEI功能和结构的刻意控制。在这里，我们提出了一种以Si和Ge纳米粒子阳极为平台来操纵锂合金SEI的SEI形成过程，化学成分和形态的一般方法。SEI是通过将多种功能成分共价锚定到活性物质表面上而制成的，然后是功能成分和常规电解质的电化学分解。点击反应作为共价锚定方法，可通过调节化学结构和各种功能成分的数量在分子水平上精确控制SEI的组成和结构，并在SEI和锂合金材料之间提供紧密的接触共价键对表面的贡献。经过优化的Si纳米颗粒SEI，其通过多种组分的独特结合而功能化，并包含归因于预锚定功能组分的高浓度有机组分，在循环过程中呈现出稳定的组成和持久的形貌，并提高了Si纳米颗粒阳极的第一循环效率并在完整的电池中具有较长的循环寿命。

更新日期：2017-11-19

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