ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Shuojian Su,Yanna NuLi,Zhenguo Huang,Qi Miao,Jun Yang,Jiulin Wang
Mg2+/Li+ hybrid batteries have recently been constructed combining a Mg anode, a Li+-intercalation electrode, and an electrolyte containing both Mg2+ and Li+. These batteries have been reported to outperform all the previously reported magnesium batteries in terms of specific capacity, cycling stability, and rate capability. Herein, we report the outstanding electrochemical performance of Mg2+/Li+ hybrid batteries consisting of a one-dimensional mesoporous TiO2(B) cathode, a Mg anode, and an electrolyte consisting of 0.5 mol L–1 Mg(BH4)2 + 1.5 mol L–1 LiBH4 in tetraglyme. A highly synergetic interaction between Li+ and Mg2+ ions toward the pseudo-capacitive reaction is proposed. The hybrid batteries show superior rate performance with 130 mAh g–1 at 1 C and 115 mAh g–1 at 2 C, together with excellent cyclability up to 6000 cycles.
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DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 3
·1157-1166
·
IF 2.961
Jin Zhengfei,Ma Xiangyu,Qiu Linlin,Liu Yang,Yuan Yongfeng,Song Lixin,Du Pingfan,Xiong Jie
Compared to conventional lithium batteries, lithium-sulfur (Li–S) batteries are not only low-cost and environmentally friendly but also have a high theoretical energy density. However, the insulating nature of sulfur materials and the poor cycle stability of Li–S batteries inhibit their commercialization. Herein, porous carbon nanofibers (PCNFs) were fabricated by a facile electrospinning method and used as a cathode hosting sulfur for Li–S batteries. The porous structure effectively restrained soluble polysulfides from migrating due to shuttle effect of lithium-sulfur batteries. With the PCNFs as the sulfur host, the PCNFs/S cathode exhibited excellent cycling stability. An initial specific capacity of 835 mAh g −1 at 0.1C and a reversible capacity of 98.6% after 100 cycles were achieved. This outstanding performance can be ascribed to the rational design of the electrode structure, which can increase the interfacial contact and provide a large number of electrochemically active sites for polysulfide storage.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingshun Wang,Yongquan Zhang,Zengxu Chen,Shuo Fan,Qihui Zhang,Yue Zhang,Tiandong Zhang,Changhai Zhang,Qingguo Chi
Polymer electrolytes have become widely popular on account of their low expenses, reduced weight, simple processing, and excellent safety features. However, polymer electrolytes have yet to find use in commercial batteries because of their limited mechanical durability and poor ionic conductivity . In this paper, an ultra-stable cycles and interfaces blending polymer electrolyte (BPE) suitable for all solid-state Li metal batteries was prepared by blending three polymers: polymethyl methacrylate (PMMA), polyvinylidene fluoride hexafluoropropylene (PVDF-HFP), and polyethylene oxide (PEO). Microstructure characterization showed numerous amorphous areas with strong interfacial strength of the BPE. The BPE3 exhibited a maximum of 15.65 MPa in tensile strength. BPE2 have excellent electrochemical performance, such as wide electrochemical windows (up to 4.7 V vs Li/Li + ), high lithium ion transference numbers (up to 0.75), high ion conductivity (up to 1.87 × 10 -4 S cm −1 at 60 °C), and excellent interface stability. By assembling all state-solid LiFePO 4 /BPE2/Li batteries for electrochemical testing, BPE2 exhibit high electrochemical characteristics. BPE2 discharge specific capacity is as high as 154.7 mAh g −1 at 1C. The BPE2 underwent 200 cycles at 0.5C and 400 cycles at 1C, with capacity retention rates of 95.7 % and 96.6 %, respectively. BPE is a promising electrolyte candidate for flexible lithium metal batteries.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
FuYin Lan,HaiYan Zhang,Jinchen Fan,Qunjie Xu,Hexing Li,YuLin Min
Herein, we introduce polymer nanofibers of TiO2@NiCo-LDH as interlayers into Li–S batteries. From 0 to 60 °C, the interlayers can deliver high sulfur utilization, an outstanding rate capability, and excellent cycling life. High-temperature excitation makes it easier for the valence band electrons of TiO2 to transition to the conduction band. The electron–hole pairs formed on the surface combine with the ether group of 1,3-dioxolane in the electrolyte, which greatly reduces the decomposition and volatilization rates of the electrolyte, ensuring Li–S batteries with good cycle performance at high temperatures. The capacity can stabilize at 798.6 mAh g–1 after 100 cycles at 60 °C and 1C, and the battery can provide a capacity higher than 323.2 mAh g–1 at 0 °C. Simultaneously, the lithium metal symmetrical battery with a functional separator can be continuously cycled for 1800 and 750 h without a short circuit at the current densities of 0.65 and 1.63 mA cm–2, respectively.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Minjing Chen,Wenyang Wang,Zhepu Shi,Zhaoping Liu,Cai Shen
Solid electrolyte interphase (SEI) grown on electrode surfaces during charge-discharge processes plays a key role in the cycle performance of lithium-ion batteries. In-situ study of cathode electrolyte interphase (CEI) is challenging due to the complicated interfacial reactions on the cathode materials including gas formation and the formation of thin CEI film. Herein, we applied the electrochemical atomic force microscope (EC-AFM) to study the interfacial changes in high energy density Li- and Mn-rich (LMR) materials with an F-rich electrolyte (1 M LiPF 6 FEC/FEMC/HFE). The study indicated that the electrolyte formed a uniform and dense passivation CEI film on the LMR material surface at high voltage. The CEI is composed of inorganic LiF substrate as confirmed by X-ray photoelectron spectroscopy (XPS). The assembled battery (LMR||Li) shows an excellent cycle performance and maintains capacity at 85.5% after 100 cycles, compared to the 13.7% retention rate of commercial carbonate electrolyte (1 M LiPF 6 EC/EMC/DMC).
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高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Zhaoyi Wang,Xiaogang Li,Nanxi Dong,Bingxue Liu,Guofeng Tian,Shengli Qi,Dezhen Wu
Due to the low melting point and non-polarity of polyethylene (PE), the commercially available PE microporous separator intrinsically has poor thermostability above 100 °C and inferior wettability , limiting the development of lithium-ion batteries (LIBs). Herein, a novel PE composite separator coated by high-temperature zirconia@polyimide core–shell nano-microspheres (ZrO 2 @PI nano-microspheres) was designed, producing (ZrO 2 @PI)/PE separator with thermal stability, wettability, and flame retardancy. On account of the ZrO 2 shell nanoencapsulation, the hydrophilicity of PI nano-microspheres has been dramatically improved, which can enhance the electrolyte wettability of the composite separator, and the prepared (ZrO 2 @PI)/PE separator displays enhanced thermal dimensional stability, maintaining its original shape with negligible shrinkage at 150 °C. Furthermore, different from the commercial Al 2 O 3 ceramic-coated separators, the (ZrO 2 @PI)/PE separators possess lower areal density, which is only half as much as the Al 2 O 3 /PE separators. Besides, the half-cell assembled with this (ZrO 2 @PI)/PE separator shows a comparable capacity of 156.9 mAh·g −1 at 5 C to PE separator (118.4 mAh·g −1 ). Meanwhile, the cells assembled with (ZrO 2 @PI)/PE separator demonstrate enhanced cycle performance and thermal safety performance and can work continuously for 109 min at 140 °C, which has enormous improvement compared with the PE-separator-equipped cell (i.e., 21 min). The above results manifest that the (ZrO 2 @PI)/PE separator prepared in this work furnishes LIBs with high safety and electrochemical performance, promising new-generation high energy density and high security LIBs.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Qin Zhao,Yuhang Zhang,Guiru Sun,Lina Cong,Liqun Sun,Haiming Xie,Jia Liu
Developing a long-term stable electrolyte is one of the most enormous challenges for Li–O2 batteries. Equally, the high flammability of frequently used solvents seriously weakens the electrolyte safety in Li–O2 batteries, which inevitably restricts their commercial applications. Here, a binary mixture of highly concentrated tetraglyme electrolyte (HCG4) and 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE) was used for a novel electrolyte (HCG4/TTE) in Li–O2 batteries, which exhibit good wettability, enhanced ionic conductivity, considerable nonflammability, and high electrochemical stability. Being a co-solvent, TTE can contribute to increasing ionic conductivity and to improving flame retardance of the as-prepared electrolyte. The cell with this novel electrolyte displays an enhanced cycling stability, resulting from the high electrochemical stability during cycling and the formation of electrochemically stable interfaces prevents parasitic reactions occurring on the Li anode. These results presented here demonstrate a novel electrolyte with a high electrochemical stability and considerable safety for Li–O2 batteries.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 27
·期 1
·171-182
·
IF 2.747
He Jielong,Bai Zhe,Huang Xinping,Zhang Zhengyu,Lu Lu,Li Jun
In this work, Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 was prepared by the sol–gel method and coated with FePO 4 . The experimental results show that the material surface is uniformly coated with FePO 4 . A small amount of coating will not change the layered structure of the material. Among them, the material with 5% FePO 4 coating has the best performance. The first charge and discharge specific capacity at 0.1 C current density is 324.4 mAh g −1 and 280.4 mAh g −1 , respectively. And the first coulomb efficiency is 86.4%, which is significantly higher than 75.6% of the pristine material. The improvement of the first charge–discharge performance of the coating material is due to the decrease of discharge voltage plateau and the redox of FePO 4 with electrochemical activity. When the FePO 4 coating content is 5%, the cycling performance of the material at 0.2 C current density is the best. After 100 cycles, the capacity decays from 268.4 to 232.9 mAh g −1 , and the capacity retention rate is 86.78%, which is higher than 60.58% of the pristine sample. The discharge specific capacity of 5% coated material at 5 C rate is 134.8 mAh g −1 , which is higher than 95.3 mAh g −1 of the pristine material. Graphical
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Kui Liu,Liang Shi,Xueying Wang,Cheng Liu,Jie Li,Yulong Liao,Lichuan Jin,Dainan Zhang,Huaiwu Zhang
Herein, Li + -enriched Li (1+ x )2 ZnTi 3 O 8 ceramics are prepared via the solid-phase methods. As x increases, the unit cell volume gradually increases, while the grain size initially increases and then decreases gradually. The Li (1+0.06)2 ZnTi 3 O 8 ceramics exhibit the best dielectric properties : ε r = 25.92, Q × f = 109534 GHz (@7.37 GHz, which is a 48 % increase compared with the stoichiometric counterpart.), and τ f = −8.21 ppm/°C. The complex chemical bond theory and Raman spectroscopy reveal that Ti-O bonds have a significant effect on the dielectric properties . An optimal Li + enrichment leads to an overall reduction in the distortion of the Li/ZnO 4 tetrahedra, resulting in a reduction in τ f . First-principles calculations demonstrate that a suitable excess of Li + leads to an increase in the band-gap as well as an enhanced electron cloud density in the internal space of the Li1/ZnO 4 tetrahedra, thereby increasing the Q × f . In summary, Li + -enriched Li (1+0.06)2 ZnTi 3 O 8 ceramics are promising for a wide array of applications in microwave communications.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yijing Qiu,Dongsheng Lu,Yunyan Gai,Yuepeng Cai
Adiponitrile (ADN) is studied as an additive of commercial carbonate electrolyte for a graphite/NCM811 Li-ion cell in this work. Compared with the cell using a baseline electrolyte, the cycling stability of the cells using 0.2, 0.5, 1, and 2 wt % ADN-added electrolytes is significantly improved. Among them, the effect is most prominent when the ADN content is 0.5 wt %, and the capacity retention rate of the cell after 200 cycles at 0.3 C is increased by 17.6%. Scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy analyses confirm that ADN can make the coating layer formed on the cathode and anode surfaces of the cell denser and uniform. The formation of the cathodic coating layer does not obey the usual mechanism of adsorption between the nitrile group and metal ions, but it may be due to the polymerization of ADN initiated by carbocations from the oxidation of solvent molecules (ethylene carbonate/ethyl methyl carbonate) in the electrolyte. The cathodic coating layer greatly decreases the oxidation of the electrolyte so that a stable coating layer (also called solid electrolyte interface/SEI) can be formed on the anode, which is the reason for improvement of the cycling performance of the cell. However, the formation of the anode SEI layer is almost independent of ADN, and it still depends on the common reduction reaction of the electrolyte.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 19
·期 12
·3595-3604
·
IF 2.446
Hou Xianhua,Zhang Miao,Wang Jiyun,Hu Shejun,Liu Xiang
A silicon/silver/carbon (Si/Ag/C) composite with a core-core-shell structure has been synthesized via a simple method based on pyrolysis of an organic carbon source and silver mirror reaction. The Si and Ag nanoparticles are served as cores, while the porous amorphous carbon layer formed from pyrolysis of citric acid is served as shell. The porous amorphous carbon layer and highly conductive Ag nanoparticles can effectively alleviate the volume change of Si nanoparticles during lithiation/delithiation process and provide sufficient electrical conductivity for Si nanoparticles. As an anode material, the obtained Si/Ag/C composite exhibits excellent electrochemical performances, including high initial coulombic efficiency (85.6 % at 200 mA g −1 ), stable cycling performance (a discharge capacity of 2006.3 mA g −1 at 200 mA g −1 after 100 cycles), and excellent rate performance (a discharge capacity of 826.4 mA h g −1 at 3 A g −1 ). This simple method may open up an effective way to make other anode and cathode materials for commercial lithium-ion battery.
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高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Junyan Li,Wei Zhang,Xin Ge,Ming Lu,Xiangxin Xue,Zizhun Wang,Nailin Yue,Junkai Zhang,Xingyou Lang,Qing Jiang,Weitao Zheng
Inspired by a well-known architecture notion that load-bearing walls enable maintaining a highly-stable multiple-floored building, superior advantages are afforded via fabricating the NH 4 + ions pre-intercalated Mo 2 CT x MXene (Mo 2 CT x -N) in a mixed solution of NH 4 F and HCl via a simple one-step hydrothermal method. As a result of the synergistic effects of pillared structure, immobilizing -F groups and unlocking Mo-based redox, the Mo 2 CT x -N remarkably delivered a reversible capacity of 384.6 mAh g −1 at 200 mA g −1 after 100 cycles. Our work lays a foundation for fully packaging its optimal performance via carding and architecting the chemistry of the MXene layers and between them.
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高影响因子
危险品化学品经营许可证（带存储）