
Molecular anchoring of free solvents for high-voltage and high …
2024年3月6日 · Herein, we propose a molecular anchoring diluent electrolyte (MADE, down to 0.19 M) with a wide electrochemical stability window (>4.7 V on NMC811 cathode) and greatly increased thermal runaway...
能源学人:明军/李茜电解液低浓度篇:犹抱琵笆半遮面的离子插层 …
2024年12月11日 · 【研究介绍】 近日,中科院长春应化所明军研究员、马征特别研究助理通过引入氟醚(1,1,2,2-四氟乙基-2,2,3,3-四氟丙基醚,HFE)稀释剂设计了一种与石墨负极兼容的新型超低浓度(0.43 M,甚至0.27 M)阻燃电解液。 所设计的电解液避免了易燃有机溶剂的使用,能够有效提高钾离子电池的安全性。 研究表明,TMP和HFE之间通过电正性的H(𝛿+H)和电负性的F(𝛿-F)产生的偶极-偶极相互作用,能够削弱K+-溶剂相互作用,进而调节K+-溶剂-阴离子配合物 …
Probing the Functionality of LiFSI Structural ... - ACS Publications
2022年9月13日 · Motivated by high Li Coulombic efficiency (CE) achieved with electrolytes featuring the bis (fluorosulfonyl)imide (FSI –) anion, this work examined chemically related sulfonyl/sulfamoyl fluoride additives to correlate FSI – -relevant structural features with CE.
test data on electrochemical performance, we have derived a selection principle for HFE s based on the position of the electron -withdrawing fluoroalkyl group s. Scheme S1 displays the general structure of a hydrofluoroether, where the flu oroalkyl groups can be
Wide temperature cycling of Li-metal batteries with …
2022年1月1日 · PFG-NMR measurements were performed to determine the self-diffusion coefficients of the ionic species and the apparent Li-ion transference number (t + NMR) by evaluating η con. As η con is related to degree of the Li concentration gradient, the magnitude of η con is proportional to (1 − t +) according to eq (2) [49]. (2) η con ∝ 2 (1-t ...
Solid-state NMR and wide-angle X-ray diffraction study of
2012年6月20日 · In this study, we report the preparation of a β-CD IC, including a HFE molecule for the first time, and clarify the structural properties using the 19 F MAS and 1 H ( 19 F) → 13 C CP MAS NMR, and wide-angle X-ray diffraction (WAXD) techniques.
Anion-Diluent Synergistic Strategy for Improved Interfacial …
3 天之前 · There is a higher chemical shift of DME after introducing the HFE, demonstrating the decreased shielding effect of Li + for the DME solvent. In addition, the same downfield shift of 1 H NMR for the -CH 2 CH 3 in the DME and D'H’ pure solvents demonstrates the existence of an interaction between HFE and DME (Fig. S6b) [32, 33].
电化学能源:超低浓度不可燃电解质!中科院长春应化所明军团队A…
2024年11月4日 · 近日,中国科学院长春应用化学研究所明军、Ma Zheng 团队提出了一种新型的超低浓度不可燃电解质,通过引入氟醚(HFE)稀释剂与磷酸三甲酯(TMP)阻燃剂形成分子间相互作用,显著提高了钾离子电池(PIBs)中石墨阳极的兼容性和安全性。 该团队发现,通过调节HFE和TMP之间的比例,可以改变钾离子(K+)的溶剂化结构,减弱K+与TMP之间的相互作用,同时增强K+与FSI−之间的相互作用。 这种分子间相互作用不仅提高了电池的初始库仑效 …
崔屹、鲍哲南合作《JACS》:具有高电化学稳定性的新型离子导电 …
核磁共振(nmr)光谱和分子动力学(md)模拟显示,随着醚段的增加和氟段的缩短,氟化醚中的离子电导率会增加。 研究人员进一步将此类电解质应用于高电压Li-NMC 811电池,电池可以在高达C/5的倍率下稳定循环100次以上。
Structural isomers of HFE-7100 analysed by 19 F NMR
Download scientific diagram | Structural isomers of HFE-7100 analysed by 19 F NMR from publication: Influence of Isomeric Composition and Sample Handling on the Liquid Density of...