LANGMUIR
·
2019
·
IF 3.683
Yunju Wang,Jiayu Li,Yuhao Huang,Hongyu Wang
The electrolyte solutions of 1 M LiBF4 dissolved in ethyl methyl carbonate (EMC)/sulfone mixtures are applied for dual-ion batteries using graphite positive electrodes. The representative sulfone solvents include sulfolane (SL) and 3-methylsulfolane. Graphite electrodes can deliver higher capacity of anion storage in the solutions of the mixed solvents than those of pure solvents. Traditional electrochemical and in situ X-ray diffraction measurements are performed on Li/graphite cells to probe the anion intercalation process at the interface between graphite electrode and electrolyte solutions. Ionic conductivity, viscosity, and NMR tests are carried out to characterize electrolyte solutions. The effects of ion-pairing between Li+ and BF4– and the anion solvations by EMC or sulfones on the anion storage in graphite have been addressed.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2019
·Vol. 11
·期 8
·1296
·
IF 3.164
Wenwen Ding,Chun Wei,Shiqi Wang,Linmin Zou,Yongyang Gong,Yuanli Liu,Limin Zang
Gel polymer electrolyte (GPE) is a promising candidate for lithium-ion batteries due to its adhesion property (like a solid), diffusion property (like a liquid), and inhibition of the growth of lithium dendrite. In this paper, 2-(2-ethoxyethoxy)ethyl acrylate (EOEOEA) and LiBF4electrolyte were mixed as precursors of gel polymer electrolytes. Through thermal curing, a thermally stable GPE with high ionic conductivity (5.60 × 10−4s/cm at 30 °C) and wide room temperature electrochemical window (4.65 V) was prepared, and the properties of the GPE were measured by linear sweep voltammetry (LSV), AC impedance spectroscopy, Thermogravimetric analysis (TG), and X-ray diffraction (XRD) techniques. On the basis of the in-situ deep polymerization on a LiFePO4electrode and cellulose membrane in a battery case, EOEOEA-based GPE could be derived on both LiFePO4electrode and cellulose membrane. Meanwhile, the contact between GPE, LiFePO4electrode, and lithium electrode was promoted. The capacity retention rate of the as-prepared LiBF4-EOEOEA 30% gel lithium battery reached 100% under the condition of 0.1 °C after 50 cycles, and the Coulombic efficiency was over 99%. Meanwhile, the growth of lithium dendrite could be effectively inhibited. GPE can be applied in high-performance lithium batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Functional Materials Letters
·
2023
·
IF 1.3
Congqiang Gao,Junjie Zhou,Qi Zhang,Peng Cui,Qing Zhang,Wei Wei
NASICON-type Li 1 . 5 Al 0 . 5 Ge 0 . 5 P 3 O 1 2 (LAGP) is one of the most promising inorganic solid-state electrolytes (SSEs). However, its practical applications have been hindered due to the high grain boundary resistance and poor sintering performance. In this work, we introduce a novel LiBF 4 sintering aid into LAGP to promote the growth of grains, decrease grain boundary resistance, and supplement the loss of lithium. The experimental results show that the ionic conductivity of LAGP-0.5 wt% LiBF 4 has the highest ionic conductivity (3.21 × 10 − 4 S/cm), grain boundary impedance decreases from 162.2 Ω to 35.2 Ω , the relative density increases from 93.6% to 96.5%, and no impurity phase is observed in LAGP–0.5 wt% LiBF 4 . At the same ionic conductivity, the sintering temperature of LAGP without LiBF 4 and with a small amount of LiBF 4 decreases from 800 ∘ C to 700 ∘ C. The Li/LAGP-LiBF 4 /LiFePO 4 cell presents excellent cyclic stability (capacity retention of the discharge capacity is still 117.5 mAhg − 1 after 100 cycles) and a high initial discharge capacity of 164.2 mAhg − 1 at 0.2 C.
研究领域:
材料科学
·
电化学
·
储能技术
·
陶瓷
✓ 已验证
DOI
高影响因子
Batteries-Basel
·
2025
·Vol. 11
·期 4
·156
·
IF 4.8
Ying Hu,Dandan Wang,Qijie Yu,Ziyi He,Fengrui Deng,Hao Yan,Tinglu Song,Jin-Cheng Zheng,Yang Dai
Localized high-concentration electrolytes (LHCEs) are promising systems for improving the high-voltage performance and interfacial stability of lithium-metal batteries (LMBs). Unfortunately, they are always challenged by liquid–liquid phase separation during solution preparation. Further investigation is always required when the prepared electrolyte has encountered liquid–liquid phase separation previously. Here, we propose a “cognate cosolvent” strategy to mediate phase-separated LiBF4/fluoroethylene carbonate (FEC)|ethyl trifluoroacetate (TFAE) mixtures with ethyl acetate (EA), forming effective LiBF4/FEC/EA/TFAE-based LHCEs (B-LHCEs). Because of their unique solvation structure, the B-LHCEs exhibit high oxidative stability, facilitating Li+transport. The optimized B-LHCEs help single-crystal LiMn0.8Mn0.1Co0.1O2/Li batteries form robust interphases, improving interfacial stability. As a result, distinct performance can be obtained (4.5 V, 500 cycles, ~90%, 1400, ~70%; 25 C, 128 mAh g−1, 4.7 V, 500, 82.5%). This work turns the “impossible” into an “effective” high-voltage electrolyte design, transcending the previous paradigms of electrolyte investigation and enriching LHCE preparation research.
研究领域:
电化学
·
材料科学
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储能技术
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2017
·Vol. 91
·期 7
·1292-1300
·
IF 0.581
Zhang Binbin,Li Yantao,Hou Baorong
Ionic solvation in solutions of lithium tetrafluoroborate (LiBF 4 ) in propylene carbonate (PC) + dimethyl sulfoxide (DMSO) mixtures has been studied using Fourier transformed infrared (FTIR) spectroscopy. Dimerization of DMSO molecules in the solutions was taken into account. The obtained results are discussed with respect to the electrolyte concentration and properties of the cations of the electrolyte. Band changes due to solvation interaction were detected in the region of the C=O stretching vibrations and ring deformation for PC, and the S=O stretching vibrations and C–S–C skeleton stretching modes for DMSO, indicating that there is a strong interaction between lithium cations and solvent molecules. In addition, Li + was preferentially solvated by DMSO in these binary solvents as a result of the large difference in their donor number (DN) values. The structures of PC, DMSO, Li + -PC, Li + -DMSO, and Li + -PC+DMSO were given.
研究领域:
物理化学
·
电化学
·
光谱学
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电池材料
·
溶液化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）