Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 25
·7976-7981
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IF 7.393
Xiankai Fu,Wanqi Chen,Xiaowen Hao,Zhimin Zhang,Ruolan Tang,Bo Yang,Xiang Zhao,Liang Zuo
This paper reports a new candidate material λ-Ti3O5 for microwave absorption. λ-Ti3O5 has been proposed to be metastable and has emerged at room temperature only in the form of nanocrystals. To prepare high purity λ-Ti3O5, the formation energies of 27 different elements doped into λ-Ti3O5 were calculated by first-principles from the energy point of view. It was found that Li has the strongest stabilizing effect on λ-Ti3O5. The prepared λ-Ti3O5 and Li/λ-Ti3O5 show good microwave absorption properties: the efficient absorption bandwidth of λ-Ti3O5 can reach 7.9 GHz at 1.7 mm thickness, and the efficient absorption bandwidth of Li/λ-Ti3O5 can reach 7.4 GHz at 1.2 mm thickness. In addition, we propose a strategy of using the number of states of the micro-electric field to predict the microwave absorption properties of materials, which is helpful to the understanding of the origin and development of microwave absorption.
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CHINESE JOURNAL OF CHEMISTRY
·
2021
·Vol. 39
·期 10
·2801-2807
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IF 6
Mengdi Zhang,Xiaofeng Lei,Yang Lv,Xizheng Liu,Yi Ding
Main observation and conclusion The application of lithium-ion batteries in cold climates has been hindered due to the decline in performance at low temperatures. The increased de-solvation energy and formation of Li dendrites at the anode surface emerge as the major challenges, which rely on the development of stable anode and compatible electrolytes. Herein, a self-healing GaInSn liquid metal (LM) based electrode coupled with a multi-solvent electrolyte is proposed toward reversible Li-storage at low temperatures. By using methyl butyrate (MB) as a co-solvent in 1 mol·L –1 LiTFSI of ethylene carbonate and diethyl carbonate, the electrolyte viscosity decreases from 52.07 to 13.75 mPa·s, while the ionic conductivity increases from 1.38 to 3.44 mS·cm –1 at –20 °C. Moreover, the Li/MXene@LM cells can display a discharge capacity of 500 mAh·g –1 , with capacity retention of 78% at –20 °C after 120 cycles. It is disclosed that a uniform LiF-rich solid electrolyte interface (SEI) layer on the anode is formed upon the addition of MB, which promotes the desolvation of Li ions at the interface of electrode/electrolyte especially at low temperatures. These results prove that MB as the co-solvent is well compatible with LM based anodes and holds great potential for the exploration of low-temperature energy devices.
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Tungsten
·
2021
·Vol. 3
·期 3
·338-347
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IF 0
Wei Han,Yang Hao-Yu,Zhang Xiao-Qi,Zhu Jian-Feng,Qiu Peng-Peng,Luo Wei
Molybdenum trioxide (MoO 3 ) is regarded as a promising electrode material for lithium (Li)-ion batteries because of its unique layered structure with a high theoretical capacity (~ 1117 mAh·g −1 ). Till now, numerous researches have focused on tuning MoO 3 morphology to improve its electrochemical performance. However, the fabrication of MoO 3 with a two-dimensional (2D) nanosheet clusters structure has yet been achieved. Here, we report a facile one-step solvothermal method to prepare MoO 3 nanosheets, of which the morphology can be facilely tuned via the dose of hydrogen peroxide. Both the experimental results and theoretical calculation suggest that the resultant 2D nanosheets structure could reduce the diffusion paths, which is beneficial for the intercalation of Li-ion. As a result, the nanosheets assembled Li-ion battery has a reversible specific capacity of 756.1 mAh·g −1 at 0.5 A·g −1 , and maintained at 214.7 mAh·g −1 after 600 cycles at a current density of 1 A·g −1 with the Coulombic efficiency as high as 97.17%.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 42
·2103214
·
IF 18.808
Xianbo Yu,Guangyu Zhao,Chao Liu,Canlong Wu,Huihuang Huang,Junjie He,Naiqing Zhang
Owing to the low-cost, dendrite-free formation, and high volumetric capacity, rechargeable Li + /Mg 2+ hybrid-ion batteries (LMIBs) have attracted great attention and are regarded as promising energy storage devices. However, due to the strong Coulombic interaction of Mg 2+ with host materials, the traditional “Daniell Type” LMIBs with only Li + intercalation usually cannot ensure a satisfactory energy density. Herein, graphene monolayers are arranged intercalating into MoS 2 interlamination to construct van der Waals heterostructures (MoS 2 /G VH). This operation transforms the construction of ion channels from pristine interlamination of two MoS 2 monolayers to the interlamination of MoS 2 monolayer with graphene monolayer, thereby greatly reducing ion diffusion energy barriers. Compared with pristine MoS 2 , the MoS 2 /G VH can obviously reduce the migration energy barriers of Li + (from 0.67 to 0.09 eV) and Mg 2+ (from 1.01 to 0.21 eV). Moreover, it is also demonstrated that MoS 2 /G VHs realize Li + /Mg 2+ co-intercalation even at a rate current of 1000 mA g −1 . As expected, the MoS 2 /G VH exhibits superior electrochemical performance with a reversible capacity of 145.8 mAh g −1 at 1000 mA g −1 after 2200 cycles, suggesting the feasibility of potential applications for high-performance energy storage devices.
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CORROSION SCIENCE
·
2021
·
IF 7.205
Jian Zhang,Jin Huang,Ruxia Liu,Guoqiang Luo,Qiang Shen
Immersion tests of AlN in LiF-LiCl-LiBr-Li salt have been performed at 500 °C to study the corrosion behaviour of AlN. The results show that AlN initially corroded at a higher rate (2⋅10 −5 mg/(mm 2 ⋅h)) during 0−50 h than during 50−300 h (6⋅10 -6 mg/(mm 2 ⋅h)) because the formation of an alumina corrosion layer protected the AlN from further corrosion. The addition of metallic Li at low concentrations (<0.1 wt. %) to the molten salt inhibited the corrosion of AlN by preferentially depleting oxygen impurities, while Li at high concentrations (>0.1 wt. %) accelerated corrosion by reacting with YAG in AlN.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Ningning Feng,Bingliang Wang,Zhuo Yu,Yuming Gu,Lili Xu,Jing Ma,Yonggang Wang,Yongyao Xia
Li–CO2 batteries have attracted worldwide attention because of their dual characteristics of high energy density and effective CO2 capture. However, the basic electrochemistry mechanism involved has been unclear, which is mainly confused by the complicated decomposition of organic electrolytes. Herein, water-in-salt (WIS, LiTFSI/H2O 21.0 mol/1 kg) has been explored as a suitable electrolyte for the first time to investigate the reaction mechanism of Li–CO2 batteries with different cathodes (carbon nanotube (CNT) and Mo2C/CNT, respectively). An Mo2C-based Li–CO2 battery with WIS delivers a higher energy efficiency of 83% and a superior cyclability, compared to those of the CNT-based counterpart cell. Through various ex/in situ qualitative/quantitative characterizations, the Mo2C-based Li–CO2 battery with WIS can operate on the reversible conversion of CO2-to-Li2C2O4 ((e–/CO2)ideal = 1) at lower discharge/charge overpotentials, while the CNT-based counterpart cell is based on the formation/decomposition of Li2CO3 ((e–/CO2)ideal ≈ 1.33) at high overpotentials. Such a difference in CO2 reduction products stems from the stronger interaction between Mo2C(101) and Li2C2O4 than that of the CNT and Li2C2O4 based on the density functional theory calculations, resulting in the selective stabilization of the intermediate product Li2C2O4 on the Mo2C surface.
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PubMed
高影响因子
ADVANCED MATERIALS
·
2020
·Vol. 33
·期 3
·2006118
·
IF 27.398
Zhengping Ding,Chen Yang,Jian Zou,Shulin Chen,Ke Qu,Xiumei Ma,Jingmin Zhang,Jing Lu,Weifeng Wei,Peng Gao,Liping Wang
Fluorographites (CF x ) are ultrahigh-energy-density cathode materials for alkaline-metal primary batteries. However, they are generally not rechargeable. To elucidate the reaction mechanism of CF x cathodes, in situ transmission electron microscopy characterizations and ab initio calculations are employed. It is found that it is a two-phase mechanism upon K/Na/Li ion insertion; crystalline KF (crystalline NaF nanoparticles and amorphous LiF) is generated uniformly within the amorphous carbon matrix, retaining an unchanged volume during the discharge process. The diffusivity for K/Na/Li ion migration within the CF x is ≈2.2–2.5 × 10 –12 , 3.4–5.3 × 10 –12 , and 1.8–2.5 × 10 –11 cm 2 s –1 , respectively, which is comparable to the diffusivity of K/Na/Li ions in liquid-state cells. Encouraged by the in situ transmission electron microscopy (TEM) results, a new rechargeable all-solid-state Li/CF x battery is further designed that shows a part of the reversible specific discharge capacity at the 2nd cycle. These findings demonstrate that a solid-state electrolyte provides a different reaction process compared with a conventional liquid electrolyte, and enables CF x to be partly rechargeable in solid-state Li batteries.
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Functional Materials Letters
·
2020
·
IF 2
Kaicheng Yue,Zhaoqian Yan,Zhihao Sun,Anran Li,Lei Qian
In this work, graphitic carbon nitride (g-C 3 N 4 ) was modified by Pd nanoparticles (Pd-CN) to prepare an efficient cathode catalyst for Li-O 2 batteries. The specific surface area of g-C 3 N 4 was improved to 239.56 m 2 /g by two-steps thermal polymerization. Pd nanoparticles were loaded onto the g-C 3 N 4 by K 2 PdCl 4 reduction with NaBH 4 . The resulted Pd-CN composites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscope, and transmission electron microscope. The results proved that g-C 3 N 4 showed three-dimensional layered and porous structure, and Pd nanoparticles were successfully supported on it. The Li-O 2 batteries using Pd-CN composites as cathode catalysts were assembled and tested. The maximum initial discharge specific capacity reached 26,614 mAh g − 1 at current density of 100 mA g − 1 . The electrodes remained large capacity under high current density, meaning excellent rate capability. Li-O 2 batteries containing Pd-CN cathode were continuously cycled for 70 cycles with no loss of capacity and obvious change in the terminal voltage. These electrochemical results indicated that the loading Pd nanoparticles effectively increased specific capacity, reduced overpotential and improved the cyclic stability. The Pd-CN composites are proved to be the promising cathode catalysts for Li-O 2 batteries.
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Waste and Biomass Valorization
·
2020
·Vol. 11
·期 12
·6967-6979
·
IF 2.851
Yao Yuan,Hou Hongying,Liu Xianxi,Meng Kun,Qiu Jinxu,Wang Lei,Zhu Jing
Abstract Abstract In this work, copper l -phenylalanine (abbreviated as Cu(L-Phe) 2 ) complex was extracted from the waste acid Cu-printed-circuit-board (Cu-PCB) etchant via a one-step facile liquid phase precipitate reaction for the first time. The corresponding application feasibility in lithium-ion battery (LIB) and the electrochemical Li-storage mechanism were also explored. The resultant Cu(L-Phe) 2 complex displayed a nanosheet-like morphology with 200 nm in thickness. When it was used as the anode active material of LIB, the reversible discharge specific capacities were 231.1 mAh/g at 100 mA/g and 47.2 mAh/g at 5 A/g, respectively. Furthermore, with the help of surfactant sodium dodecyl sulfate (SDS), Cu(L-Phe) 2 complex nanosheets rearranged into the orderly flower-like cluster with a diameter of 13 μm; correspondingly, the reversible discharge specific capacities also increased to about 278.8 mAh/g and 108.8 mAh/g, respectively, implying higher reversibility and cycle performance. Seemingly, orderly flower-like nanosheets clusters with the hierarchical structure may facilitate to modify the electrochemical Li-storage capacity of Cu(L-Phe) 2 complex anode. Clearly, the satisfactory results may open a new path to develop the circular economy mode of acid waste Cu-PCB etchant, which is very important for environmental protection and sustainable development. Graphic Abstract
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 47
·49549
·
IF 2.52
Muhammad Awais Ashraf,Junfeng Wang,Baichun Wu,Penglei Cui,Baohua Xu,Xingchun Li
Extraction of lithium from high Mg 2+ /Li + ratio salt lake brine with the nanofiltration (NF) membrane is significantly challenging. Interfacial polymerization was utilized for the facile modification of NF membranes with polydopamine (PDA) and polyethylenimine (PEI) to enhance lithium separation efficiency. Comparing permeability and salts rejection (Li + and Mg 2+ ) of three NF membranes before and after PDA/PEI deposition, it was observed that separation efficiency was not only dependent on steric hindrance but also affected by Donnan exclusion mechanism. In the case of NF270 membrane after facile polymerization, due to small pore size distribution and low charge density confirmed by zeta potential measurements, Li + permeability was reached about 95% at a flux of 21.33 L·m −2 ·h −1 . Although with the DK membrane, separation factor SF Li/Mg was also increased up to 60 after modification, the pore narrowing effect significantly decreased lithium permeability and flux. Experimental results showed that facile modification not only enhanced stability and hydrophilicity but also reduced the high Mg 2+ /Li + ratio from 30 to 4.1 in single-stage separation.
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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Kaiyue Zhang,Wei Xiao,Xiangrong Li,Jianguo Liu,Chuanwei Yan
The separator as an important component in Li-ion batteries faces increasing challenges with the next-generation batteries towards higher energy density and longer life. An urgent task is to simultaneously achieve fire resistance, high thermal stability and electrolyte affinity for polymeric separators. Herein, to address all these needs, we report a mussel-inspired silica-coated expanded polytetrafluoroethylene separator fabricated by a multi-step synthesis process of dopamine self-polymerization and subsequent silica in-situ self-assembly. The separator inherits the advantages of expanded polytetrafluoroethylene matrix in terms of significant fire resistance and unique porous structure , especially exhibiting superior thermal dimensional stability up to 300 °C. Additionally, the polydopamine layer acts as a double-sided tape sticking expanded polytetrafluoroethylene matrix and silica layer without any polymeric binders avoiding excessive pore blocking . More significantly, the in-situ grown silica layer combined with the polydopamine layer completely solves the Achilles' heel of polytetrafluoroethylene material to endow the separators with excellent electrolyte affinity. Benefiting from such structural uniqueness, the LiFePO 4 half-cell assembled with the separator shows an enhanced discharge capacity of 157.1 mA h g −1 at 0.2C and C-rate capacity of 115.6 mA h g −1 at 5C. Therefore, this study provides inspiration for the expanded polytetrafluoroethylene-based separators facing the next-generation Li-ion batteries.
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Frontiers in Energy Research
·
2020
·
IF 2.746
Yang Qianwen,Chen Langlang,Feng Xiang,Li De,Chen Yong
Being a graphite-like material, LiBC can deliver a high capacity as an anode material in Li-ion batteries, which are strongly dependent on carbon precursors. Developing a method to improve the capacity would be significant to the study and utilization of LiBC anode material. Here we treated a pristine LiBC material with a high temperature to obtain four modified LiBC samples. A reversible capacity of 353 mAh/g was delivered by a modified LiBC sample treated at 600°C for 10 h in a powder form wrapped with an Al foil, which was only 218 mAh/g for the pristine LiBC in Li-ion batteries. According to the XRD result, the layer structure of LiBC was maintained after the high-temperature treatment, while the lattice parameters were changed slightly, especially for the interlayer distance. The modified LiBC samples showed a similar Raman spectra to the pristine LiBC except for the peak intensity, which indicates lithium evaporation during high-temperature treatment. Thereby, the high-temperature treatment can improve the capacity of LiBC through reducing the lithium content and modifying the crystal structure, and this method would make the LiBC material become a more promising anode material in Li-ion batteries.
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