ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yuenan Chen,Ziming Li,Nanjun Chen,Rui Li,Yajun Zhang,Ke Li,Fanghui Wang,Hong Zhu
In this paper, we prepared a series of ionic liquids including methyl ionic liquids, ethyl ionic liquids and hydroxyethyl ionic liquids. We used the common polymer backbone polyphenylene ether and the conventional conductive group triethylamine . We introduced three different ionic liquids to investigate different effects of the extent of ion conductivity improvement from its structure change. The introduction of ionic liquid significantly improved the ionic conductivity of the alkaline membrane. The highest conductivity of the composite membranes was 2.5 times higher than that of the pure membrane. A certain amount of nano-TiO 2 was added into the membranes through ultrasound dispersion to form a series of trimethylamine-nano-TiO 2 -ionic liquid composite membranes. We found that TiO 2 -ethyl ionic liquid composite membrane has optimal performance, whose ionic conductivity up to 59.27 mS/cm. and the degradation rate of ionic conductivity is 27.4% under strong alkali conditions. The water uptake and swelling ratio of the composite membrane are relatively low, and the thermal stability and mechanical properties also meet the requirements of the application.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Batteries & Supercaps
·
2022
·Vol. 5
·期 12
·e202200305
·
IF 6.043
Yan Zhang,Yafei Wang,Yangming Zhang,Jingxin Zhao,Yiyang Liu,Ying Guan,Yongjun Zhang
Graphical Better electrolyte : A facile “water-salt-in-deep eutectic solvent” strategy is reported here to increase the ionic conductivity, while reducing the viscosity and freezing temperature for eutectic electrolytes. Compared to the initial DES, supercapacitors using “water-salt-in-deep eutectic solvent” electrolyte have higher specific capacitance, better rate performance, lower IR voltage drop, and lower internal resistance. A novel and simple “water-salt-in-deep eutectic solvent” (WS-DES) strategy is reported here to increase the ionic conductivity, while reducing the viscosity and freezing temperature of deep eutectic solvent (DES). Upon the addition of water and strong electrolyte salt to the DES of [LiTFSI][EG], the conductivity was increased by 16 times, the viscosity was decreased by 36 %, and the freezing temperature was decreased by 30 °C. Additionally, WS-DES strategy can be well applied to electrolytes for supercapacitor devices. Compared to the initial DES, supercapacitors using WS-DES electrolyte have higher specific capacitance, better rate performance, lower IR voltage drop, and lower internal resistance. Moreover, the WS-DES electrolyte also exhibits excellent electrochemical stability under extreme condition even at −40 °C.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Li Ding,Yu Tan,Guiliang Li,Kaiqiang Zhang,Xu Wang
Solid polymer electrolytes (SPEs) have garnered extensive attention as potential alternatives to traditional liquid electrolytes, primarily due to their prowess in curbing lithium dendrite formation and preventing electrolyte leaks. The quest for SPEs that are both mechanically robust and exhibit superior ionic conductivity has been vigorous. However, achieving a harmonious balance between these two attributes remains a significant challenge. In this study, we introduce a novel quasi-solid electrolyte, ingeniously crafted from a poly(urethane-urea) network, enriched with lithium salts and plasticizers. This innovative composition not only boasts remarkable toughness but also ensures commendable ionic conductivity. Our post-gelation method yields gel polymer electrolytes that undergo rigorous evaluation, leading to an optimized version that stands out with its exceptional room-temperature ionic conductivity (2.94 × 10-4 S cm-1) and outstanding toughness (11.9 MJ m-3). Moreover, it demonstrates a broad electrochemical window (4.73 V), remarkable stability across a 600-hour cycle test, a high capacity retention exceeding 80% after 100 cycles at 0.2 C, and a noteworthy self-healing capability. This quasi-solid polymer electrolyte emerges as a promising contender to replace current liquid electrolyte solutions.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 13
·3094
·
IF 3.1
Chengjun Lin,Yaoyi Huang,Dingrong Deng,Haiji Xiong,Bin Lu,Jianchun Weng,Xiaohong Fan,Guifang Li,Ye Zeng,Yi Li,Qihui Wu
Replacing the flammable liquid electrolytes with solid ones has been considered to be the most effective way to improve the safety of the lithium batteries. However, the solid electrolytes often suffer from low ionic conductivity and poor rate capability due to their relatively stable molecular/atomic architectures. In this study, we report a composite solid electrolyte, in which polyethylene oxide (PEO) is the matrix and Li6.4La3Zr1.45Ta0.5Mo0.05O12(LLZTMO) and Li6.4La3Zr1.4Ta0.6O12(LLZTO) are the fillers. Ta/Mo co-doping can further promote the ion transport capacity in the electrolyte. The synthesized composite electrolytes exhibit high thermal stability (up to 413 °C) and good ionic conductivity (LLZTMO–PEO 2.00 × 10−4S·cm−1, LLZTO–PEO 1.53 × 10−4S·cm−1) at 35 °C. Compared with a pure PEO electrolyte, whose ionic conductivity is in the range of 10−7~10−6S·cm−1, the ionic conductivity of composite solid electrolytes is greatly improved. The full cell assembled with LiFePO4as the positive electrode exhibits excellent rate performance and good cycling stability, indicating that prepared solid electrolytes have great potential applications in lithium batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Zhaojie Yang,Minghua Zhang,Zhixin Zhao,Wenting Lan,Xi Zhang,Minmin Fan
Two types of new 2D MXenes (LiF–Ti 3 C 2 T x and NH 4 HF 2 –Ti 3 C 2 T x ) were prepared by selective etching of Ti 3 AlC 2 with LiF/HCl and NH 4 HF 2 aqueous solutions, respectively, and they were introduced as nanofillers into quaternized polysulfone/polyquaternium-10 (QPSU/PQ-10) anion exchange membranes (AEMs) with semi-interpenetrating polymer network, thereby preparing two types of MXene-doped QPSU/PQ-10 AEMs. The resulting MXene-doped QPSU/PQ-10 AEMs have obvious nanoscale microphase-separated morphologies, and their ionic conductivity and power density are significantly improved compared with the pristine QPSU/PQ-10 AEM. Among them, the ionic conductivity and power density of NH 4 HF 2 –Ti 3 C 2 T x MXene-doped AEM can reach 88.76 mS/cm at 80 °C and 106.28 mW/cm 2 at 60 °C, respectively, which are 26.3% and 37.5% higher than those of the pristine QPSU/PQ-10 AEM. Additionally, the MXene-doped QPSU/PQ-10 AEMs with semi-interpenetrating network have moderate water uptake and swelling ratio, excellent thermal and mechanical properties , as well as good oxidation resistance and alkaline stability, which can meet the application requirements of AEMs for fuel cells, exhibiting their bright application prospects in fuel cells.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 56
·35687-35694
·
IF 3.361
Fu Jie Yang,Qing Feng Liu,Xiao Bing Wu,Yu Yi He,Xu Gang Shu,Jin Huang
Polymer electrolytes offer great potential for emerging wearable electronics. However, the development of a polymer electrolyte that has high ionic conductivity, stretchability and security simultaneously is still a considerable challenge. Herein, we reported an effective approach for fabricating high-performance poly(ionic liquids) (PILs) copolymer (denoted as PIL-BA) electrolytes by the interaction between flexible units (butyl acrylate) and counteranions. The introduction of butyl acrylate units and bis(trifluoromethane-sulfonyl)imide (TFSI−) counteranions can significantly enhance the mobility of polymer chains, resulting in the effective improvement of ion transport, toughness and self-healability. As a result, the PIL-BA copolymer-based electrolytes containing TFSI− counterions achieved the highest ionic conductivity of 2.71 ± 0.17 mS cm−1, 1129% of that of a PIL homopolymer electrolyte containing Cl− counterions. Moreover, the PIL-BA copolymer-based electrolytes also exhibit ultrahigh tensile strain of 1762% and good self-healable capability. Such multifunctional polymer electrolytes can potentially be applied for safe and stable wearable electronics.
研究领域:
材料科学
·
聚合物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Shi Jia Li,Guang Tao Fei,Shao Hui Xu,Wen Chao Chen,Hai Yan Xu,Xiao Xuan Qu,Xin Feng Li,Hao Miao Ouyang
Poly (ethylene oxide) (PEO)-based solid-state electrolytes are the most researched and widely used polymer solid-state electrolytes, but their ionic conductivity, electrochemical stability window, and cycling stability all need further improvement. In this work, 15 Crown ether 5 and the high concentration of lithium salts are added into PEO solid-state electrolytes using a solution-casting approach. The resulting solid-state electrolyte exhibits an ionic conductivity of 3.14 × 10 −3 S cm −1 at 60 °C and an electrochemical stability window exceeding 5.2 V. The assembled Li//Li symmetric battery can be stably cycled for over 850 h at a current of 0.1 mA cm −2 , and the LiFePO 4 //Li battery has an initial discharge capacity of 144 mA h g −1 at 2C rate, retaining 85 % of its capacity after 800 cycles. By optimizing the solid-state electrolyte components, Li//Li symmetric batteries can achieve cycling stability for up to 2200 h, and LiFePO 4 //Li batteries can endure up to 2000 cycles at a 2C rate and 4800 cycles at a 5C rate. Moreover, the prepared solid-state electrolyte can be matched with a high-voltage cathode electrode, offering a wide range of potential applications and promising commercialization prospects.
研究领域:
材料科学
·
能源存储
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 47
·33257-33267
·
IF 10.7
Kaixiang Zou,Xiao Wang,Yuanfu Deng
Introduction of H2O provides an effective strategy to tailor conductivity and viscosity in an electrolyte based on a deep eutectic solvent (DES), as well as customizing the energy storage performance. Herein, a novel DES as a suitable electrolyte is prepared by means of choline chloride (ChCl) and with crystalline magnesium chloride (MgCl2·6H2O), with different amounts of H2O added as additives to investigate its effect on the electrolyte's electrochemical properties. These novel DESs are systematically studied both theoretically and experimentally, as well as being utilized as electrolytes in supercapacitors. The results show that the addition of H2O significantly optimized the ion conductivity and the viscosity of the prepared DES electrolyte. The proposed mechanism is that introduction of H2O ‘dilutes’ the interaction between ions and hydrogen bonds, and enhances the capacity of ion transport and diffusion in the electrolyte system. The supercapacitor assembled with the optimized DES electrolyte (DES-1-1.0) exhibits superior electrochemical properties within a voltage range of 0–2.6 V, delivering a remarkable energy density of 87.7 W h kg−1 at a high power density of 1.69 kW kg−1 and retains 90.25% of its initial capacitance after undergoing 30 000 cycles at 10 A g−1.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2025
·
IF 14.1
Zhen Chen,Yang Wang,Kepin Zhu,Ziqi Zhao,Xian-Ao Li,Yixin Wu,Xinwei Dou,Minghua Chen,Chuying Ouyang
Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) is a promising solid-state electrolyte for next-generation solid-state lithium metal batteries, offering high ionic conductivity, superior air stability, and low cost. However, its practical application is hindered by high interface impedance due to rigid solid–solid contact with electrodes and instability when in contact with lithium metal. Here, a hybrid solid–liquid electrolyte is designed, consisting of a porous 3D LATP skeleton infiltrated with carbonate-based organic electrolyte, to ensure sufficient electrolyte wettability. Further, the thermodynamic instability between LATP and Li is solved by magnetron sputtering a layer of ferroelectric Ba 0.5 Sr 0.5 TiO 3 (BST) onto the LATP surface. This BST interlayer prevents direct contact between LATP and Li metal, enhancing performance by dynamically regulating Li + deposition, inhibiting dendrite growth, reducing overpotential and interface resistance, and improving Li + transport. Compared to the LATP-based electrolyte (LATP-LE), the BST-modified hybrid electrolyte (B@LATP-LE) demonstrates largely improved ionic conductivity (0.42 to 1.38 mS cm −1 ) and outstanding electrochemical performance, achieving stable cycling for over 7000 h in Li||Li cells and superior stability in LiFePO 4 ||Li and LiNi 0.8 Co 0.1 Mn 0.1 O 2 ||Li full cells. This approach offers a cost-effective solution to the interface issues of LATP and provides insights for high-performance lithium metal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Saisai Zhang,Hailei Zhao,Jie Wang,Tao Xu,Kangkang Zhang,Zhihong Du
As promising next generation energy storage system, all solid state lithium batteries offer great potential for achieving high energy density and improved safety over lithium batteries with liquid counterpart. Dense microstructure with high ionic conductivity are prerequisites for solid electrolyte. The promising Li-garnet electrolyte suffers from poor sinterability, which results in porous structure and large grain boundary resistance. Herein, we report that the poor sinterability of garnet Li 7 La 3 Zr 2 O 12 is most likely related to the Li 2 CO 3 formed on particle surface, and SiO 2 is an efficient additive to scavenge the surface Li 2 CO 3 and so significantly improve the densification of electrolyte. The reaction product Li 4 SiO 4 of SiO 2 with Li 2 CO 3 is a Li-ion conductor, which exists at grain boundary and so can facilitate the grain boundary lithium ion diffusion. An addition of 1 mol.% SiO 2 , with respect to the total lithium content in Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO), significantly increases the relative density of LLZTO pellet by 28% and the conductivity by one order of magnitude, reaching 3.84 × 10 −4 S cm −1 at room temperature by a conventional solid state sintering. A symmetric lithium cell assembled with such dense LLZTO electrolyte can cycle well for 260 h compared with unmodified LLZTO running only for 72 h before short-circuit.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2025
·Vol. 19
·期 4
·1-9
·
IF 4.5
Wan He-Fei,Zhao Xin,Guo Qian,Gao Ce,Sun Run-Cang
Although lignin is the second most abundant forest biomass polymer, it has been largely neglected in hydrogel electrolytes due to its insolubility and inflexibility. In this study, a double-crosslinked hydrogel was prepared using aspartic acid-modified lignin and sodium alginate, significantly improving the mechanical properties. The hydrogel exhibited an exceptional strain of 3008% and a tensile strength of 0.03 MPa, demonstrating its remarkable mechanical properties. In addition, high ionic conductivity (11.7 mS·cm −1 ) was obtained due to the abundant presence of hydrophilic groups in the hydrogel. The hydrogel-assembled supercapacitor manifested an impressive specific capacitance of 39.46 F·g −1 . Notably, the supercapacitor showed a wide potential window of 0–1.5 V and achieved a maximum energy density of 5.48 Wh·kg −1 at the power density of 499.9 W·kg −1 . The capacitance retention remained at 115% after 10000 charge-discharge cycles. Finally, the coulombic efficiency was almost 100% during the cycles. Upon reaching a bending angle of 90°, the specific capacitance retention remained impressively high at 94%. These results suggest that the supercapacitor cans maintain normal electrochemical performance under extremely harsh conditions.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Jie Huan,Jing Li,Yinjia Lan,Sheng Wang,Xiaohong Li,Xiaoming Yang,Huanjun Lu,Yingfeng Tu
We present here the effect of oligo(ethylene glycol) (OEG) segmental length on properties of cyclic oligo(oligoethylene glycol terephthalate)s (COEGTs) and their corresponding polymer counterparts, poly(oligoethylene glycol terephthalate)s (POEGTs). COEGT monomers were synthesized from terephthaloyl chloride with corresponding diethylene glycol , triethylene glycol , and tetraethylene glycol under pseudo-high-dilution conditions. As those large ring cyclic monomers are hard to be polymerized via traditional ring-opening polymerization, a cascade polycondensation-coupling ring-opening polymerization method is utilized to obtain high molecular weight POEGTs. The cascade polymerization mechanism is confirmed by the kinetics study . The structures of COEGTs and POEGTs were well characterized and their properties were studied to reveal the structure-property relationship. With the increment of OEG length in repeating units, the chain flexibility of POEGT and COEGTs is enhanced. As a result, the melting temperatures of COEGTs and glass transition temperatures of POEGTs decrease. On the other hand, the thermal degradation temperature of POEGTs and COEGTs increases due to the enhanced ether fraction and reduced ring strain. Solid-state polymer electrolytes based on POEGTs was prepared by blending with lithium bis(trifluoromethanesulfonyl)imide. The measured ionic conductivity increased with the OEG length in POEGT repeating units. Our results revealed the effect of OEG length on the structure-property relationship in cyclic oligo(ether ester)s and copoly(ether ester)s, providing a facile way to tune their properties.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）