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Thin polymer electrolyte with mxene functional layer for uniform Li^(+) deposition in all-solid-state lithium battery

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Green Energy & Environment 2024年第1期9卷 71-80页

作者： Weijie Kou Yafang Zhang Wenjia Wu Zibiao Guo Quanxian Hua Jingtao Wang School of Chemical Engineering Zhengzhou UniversityZhengzhou450001China

Solid polymer electrolyte(SPE) shows great potential for all-solid-state batteries because of the inherent safety and flexibility;however, the unfavourable Li+deposition and large thickness hamper its development and application. Herein, a laminar mxene functional layer-thin SPE layer-cathode integration(mxene-PEO-LFP) is designed and fabricated. The mxene functional layer formed by stacking rigid mxene nanosheets imparts higher compressive strength relative to PEO electrolyte layer. And the abundant negatively-charged groups on mxene functional layer effectively repel anions and attract cations to adjust the charge distribution behavior at electrolyte–anode interface. Furthermore,the functional layer with rich lithiophilic groups and outstanding electronic conductivity results in low Li nucleation overpotential and nucleation energy barrier. In consequence, the cell assembled with mxene-PEO-LFP, where the PEO electrolyte layer is only 12 μm, much thinner than most solid electrolytes, exhibits uniform, dendrite-free Li+deposition and excellent cycling stability. High capacity(142.8 mAh g-1), stable operation of 140 cycles(capacity decay per cycle, 0.065%), and low polarization potential(0.5 C) are obtained in this Li|mxene-PEO-LFP cell,which is superior to most PEO-based electrolytes under identical condition. This integrated design may provide a strategy for the large-scale application of thin polymer electrolytes in all-solid-state battery.

关键词： mxene nanosheet Laminar functional layer Thin polymer electrolyte Dendrite-free Liþdeposition All-solid-state lithium battery

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Comprehensive Design of the High-Sulfur-Loading Li–S Battery Based on mxene nanosheets

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Nano-Micro Letters 2020年第9期12卷 70-82页

作者： Shouzheng Zhang Ning Zhong Xing Zhou Mingjie Zhang Xiangping Huang Xuelin Yang Ruijin Meng Xiao Liang College of Materials and Chemical Engineering China Three Gorges University8 Daxue RoadYichang 443002HubeiPeople’s Republic of China State Key Laboratory of Chem/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082People’s Republic of China College of Science China Three Gorges University8 Daxue RoadYichang 443002HubeiPeople’s Republic of China

The lithium-sulfur battery is the subject of much recent attention due to the high theoretical energy density,but practical applications are challenged by fast decay owing to polysulfide shuttle and electrode architecture degradation.A comprehensive study of the sulfur host microstructure design and the cell architecture construction based on the mxene phase(Ti3C2Tx nanosheets) is performed,aiming at realize stable cycling performance of Li-S battery with high sulfur areal *** interwoven KB@Ti3C2Tx composite formed by self-assembly of mxene and Ktej en black,not only provides superior conductivity and maintains the electrode integrality bearing the volume expansion/shrinkage when used as the sulfur host,but also functions as an interlayer on separator to further retard the polysulfide cross-diffusion that possibly escaped from the *** KB@Ti3C2Tx interlayer is only 0.28 mg cm-2 in areal loading and 3 μm in thickness,which accounts a little contribution to the thick sulfur electrode;thus,the impacts on the energy density is *** coupling the robust KB@Ti3C2Tx cathode and the effective KB@Ti3C2Tx modified separator,a stable Li-S battery with high sulfur areal loading(5.6 mg cm-2) and high areal capacity(6.4 mAh cm-2) at relatively lean electrolyte is achieved.

关键词： mxene nanosheet High sulfur areal loading Interlayer Lithium–sulfur battery

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