pH-Responsive Polymer as a New Stable Solid Electrolyte Interphase for Water-in-Salt Battery

IF 9.6 1区 化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Rossukon Jommongkol, Nantawat Kaekratoke, Yachao Zhu, Tobias Burton, Daniel Crespy* and Olivier Fontaine*, 
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Abstract

Overcoming the cathodic limits of water-in-salt electrolyte (WiSE) and developing new active materials are crucial to producing aqueous Li-ion batteries (ALIBs) with higher voltage and energy. Stabilizing the solid-electrolyte interphase (SEI) in a WiSE is expected to improve battery performance. Here, a polymer is designed with pH-responsive properties under alkaline conditions and remains soluble in WiSE, which expands the electrochemical stability window of ALIBs. The polymer prevents water reduction and coprecipitates with the LiTFSI salt in alkaline conditions, resulting in the formation of a stable SEI layer. Moreover, this polymer promotes the crystallization of LiTFSI, leading to a change in the morphology of the SEI as observed by X-ray photoelectron spectroscopy and transmission electron microscopy. Finally, the addition of the polymer in Mo6S8//LiFePO4 full cells during charge/discharge cycling tests significantly improves cycling stability, achieving 87% discharge capacity after 100 cycles at 0.5 C.

Abstract Image

ph响应聚合物作为一种新型稳定的盐包水电池固体电解质界面
克服盐中水电解质(WiSE)的阴极限制和开发新的活性材料是生产具有更高电压和能量的含水锂离子电池(ALIBs)的关键。在WiSE中稳定固体电解质间相(SEI)有望提高电池性能。在这里,设计了一种聚合物,在碱性条件下具有ph响应特性,并且在WiSE中保持可溶性,这扩大了alib的电化学稳定性窗口。聚合物可以防止水还原,并在碱性条件下与LiTFSI盐共沉淀,从而形成稳定的SEI层。此外,这种聚合物促进了LiTFSI的结晶,导致SEI的形态发生了变化,这是通过x射线光电子能谱和透射电子显微镜观察到的。最后,在充放电循环测试中,Mo6S8//LiFePO4充满电池中添加聚合物显著提高了循环稳定性,在0.5 C下循环100次后放电容量达到87%。
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来源期刊
ACS Materials Letters
ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
14.60
自引率
3.50%
发文量
261
期刊介绍: ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.
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