Tungsten
·
2021
·Vol. 3
·期 3
·338-347
·
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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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 41
·14757-14765
·
IF 7.393
Hanyang Li,Feng Wei,Yanzeng Li,Miao Yu,Yu Zhang,Lu Liu,Zhihai Liu
Temperature is a critical parameter for evaluating battery safety during the process of charging and discharging. However, it is a challenge to monitor it accurately because batteries are used in various compact environments such as energy stations. In this study, β-NaYF4:Er3+/Yb3+@NaYF4 nanoparticles were used to fabricate an optical fiber temperature sensor for battery temperature monitoring. The temperature sensing characteristics of the optical fiber sensor were explored in the range of 293–373 K using fluorescence intensity ratio (FIR) technology which can improve the temperature monitoring accuracy. The maximum relative sensitivity of the optical fiber sensor was 1.62% K−1 at 293 K and the temperature detection limit was within ±0.5 °C. By embedding the prepared sensor in a Li-ion battery, the proof of concept was obtained for monitoring the internal temperature of a battery with upconversion nanoparticles (UCNPs). A larger temperature variation was observed under a higher discharge rate. These results indicate that the prepared optical fiber sensor is an active tool for monitoring the thermal behavior and improving the safety of the battery.
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高影响因子
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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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
X.C. Li,D. Li,M. Meng,R. Wei,L. He,S.F. Zhang
A lithium disilicate (LD) glass with stoichiometric composition and glass transition temperature ( T g ) ∼ 470 °C was ion-exchanged over a wide temperature range below the T g . The ion-exchange temperatures used were 380 °C or 315 °C in a pure molten NaNO 3 bath, and 235 °C in a molten mixed salt bath of 50 mol% NaNO 3 ＋50 mol% KNO 3 . Temperature-dependences of surface layer morphology and mechanical behavior of the ion-exchanged glass were investigated. It was found that similar surface Na + concentrations were presented on the glass after the ion-exchange at all the three temperatures for different times. Surface failure occurred on the glass after the treatments at the two higher temperatures for longer time to increase the ion-exchanged depth. The surface failure could be completely avoid by substantially lowering the temperature to 235 °C in the mixed salt bath for much longer time to obtain a similar level of case depth. Similar strengthening effects were exhibited at the three temperatures as the ion-exchanged depth was shallower. With further increasing the depth, however, much more significantly strengthening effect could be achieved at the substantially lowered temperature. Flexural strength of the glass could be enhanced from ∼ 97 MPa to ∼ 520 MPa after the treatment at 235 °C for 128 h. The temperature-dependent effect to strengthen the LD glass by Li + /Na + exchange was attributed to the combined effect of stress relaxation during ion-exchange and thermal contraction coefficient mismatch between the ion-exchanged surface layer and the internal bulk glass.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Chengyi Zhu,Jianxiong Liu,Xiaohua Yu,Yingjie Zhang,Peng Dong,Xiao Wang,Yannan Zhang
Spinel LiMn 2 O 4 is regarded as a promising positive material candidate for contemporary lithium-ion batteries (LIBs). However, its development is hindered by the poor Li + diffusion during high charge/discharge rates and unstable cyclic performance associated with Mn dissolution under elevated temperature. Herein, a facile hydrothermal method with solid-state calcination is introduced to design one-dimensional (1D) La-doped LiMn 2 O 4 nanorods and ultimately enhance their cathode utilization in high-temperature and long-cycling conditions. Surprisingly, LiLa 0.03 Mn 1.97 O 4 nanorods exhibit excellent high-temperature cyclic performance for over 1000 cycles, and deliver a promising discharge capacity of 87.2 mAh g −1 at 20C rate. Furthermore, theoretical calculations confirm that compared with the pristine sample, a lower bandgap and dispersed distribution of electrons are also strong evidence of the improved electrochemical performance of LiMn 2 O 4 after La doping. This research offers a new strategy to achieve high-performance LiMn 2 O 4 -based positive materials for the development of advanced LIBs.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 36
·20614-20623
·
IF 10.733
Wei Kou,Guohui Chen,Yang Liu,Weixin Guan,Xiangcun Li,Ning Zhang,Gaohong He
To realize an Al-free cathode and to push forward the Li–S battery technology for practical applications, a multifunctional three-layer-structured Fe3C/C membrane was prepared at a large-scale via a facile phase-inversion method. The scalable yet flexible self-supporting Fe3C/C membrane is an ideal Al foil-free cathode material for high-energy and long cycling Li–S batteries. The conductive dense layer of the Fe3C/C membrane can replace the Al foil as a current collector and the finger-like macropores can host most of the sulfur active material (1.5–3.0 mg cm−2), thus buffering the volume expansion of the sulfur species and facilitating the ion/electrolyte transport for fast reaction kinetics; meanwhile, the sponge-like pores in the top layer of the composite membrane enable further S slurry loading. Density functional theory simulation (DFT) and Li2S6 adsorption measurements reveal that the doped Fe3C species in the composite membrane could effectively immobilize the S species and suppress the shuttle effect of the soluble polysulfides (LiPSs). The rationally designed Fe3C/C membrane cathodes could deliver a capacity of ∼601 mA h g−1 at 1C after 200 cycles even at a high sulfur loading of 3.4 mg cm−2, with a high areal capacity of 2.1 mA h cm−2. The cell with the sulfur loading of 3.4 mg cm−2 delivered a gravimetric energy density and volumetric energy density of 850 W h kg−1 and 1223 W h L−1, respectively. The self-supporting membrane cathode with simultaneous commercial S filling and S/C slurry coating provides an alternative sulfur loading approach for battery assembly, thus presenting a useful strategy for practical applications in high energy-density and long cycling Li–S batteries.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Chun-xian Zhou,Peng-bo Wang,Bao Zhang,Lin-bo Tang,Hui Tong,Zhen-jiang He,Jun-chao Zheng
Li-rich cathode materials are regarded as ideal cathode materials, owing to their excellent electrochemical capacity. However, residual lithium compounds, which are formed on the surface of the materials by reacting with moisture and carbon dioxide in ambient atmosphere, can impair the surface structure, injure the capacity, and impede the electrode fabrication using Li-rich materials. Exposure to air atmosphere causes the formation of residual lithium compounds; the formation of such compounds is believed to be related to humidity, temperature, and time during handling and storage. In this study, we demonstrated for the first time an artificial strategy for controlling time, temperature, and humidity to accelerate exposure. The formation and effect of residual lithium compounds on Li-rich cathode material Li1.35[Ni0.35Mn0.65]O2 were systematically investigated. The residual lithium compounds formed possessed primarily an amorphous structure and were partially coated on the surface. These compounds include LiOH, Li2O, and Li2CO3. Li2CO3 is the major component in residual lithium compounds. The presence of residual lithium compounds on the material surface led to a high discharge capacity loss and large discharge voltage fading. Understanding the formation and suppressing the effect of residual lithium compounds will help prevent their unfavorable effects and improve the electrochemical performance.
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PubMed
高影响因子
Advanced Energy Materials
·
2019
·Vol. 9
·期 31
·1900909
·
IF 24.884
Chengrui Wang,Lei Zhang,Mohammad Al-Mamun,Yuhai Dou,Porun Liu,Dawei Su,Guoxiu Wang,Shanqing Zhang,Dan Wang,Huijun Zhao
The symmetric batteries with an electrode material possessing dual cathodic and anodic properties are regarded as an ideal battery configuration because of their distinctive advantages over the asymmetric batteries in terms of fabrication process, cost, and safety concerns. However, the development of high-performance symmetric batteries is highly challenging due to the limited availability of suitable symmetric electrode materials with such properties of highly reversible capacity. Herein, a triple-hollow-shell structured V 2 O 5 (THS-V 2 O 5 ) symmetric electrode material with a reversible capacity of >400 mAh g −1 between 1.5 and 4.0 V and >600 mAh g −1 between 0.1 and 3.0 V, respectively, when used as the cathode and anode, is reported. The THS-V 2 O 5 electrodes assembled symmetric full lithium-ion battery (LIB) exhibits a reversible capacity of ≈290 mAh g −1 between 2 and 4.0 V, the best performed symmetric energy storage systems reported to date. The unique triple-shell structured electrode makes the symmetric LIB possessing very high initial coulombic efficiency (94.2%), outstanding cycling stability (with 94% capacity retained after 1000 cycles), and excellent rate performance (over 140 mAh g −1 at 1000 mA g −1 ). The demonstrated approach in this work leaps forward the symmetric LIB performance and paves a way to develop high-performance symmetric battery electrode materials.
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高影响因子
SOLID STATE SCIENCES
·
2018
·
IF 1.861
Shaocun Liu,Qingping Lu,Chenhao Zhao
Paper cup composed of crude cellulose is a common waste in daily life. In this paper, hierarchical porous carbons have been successfully prepared by an initial hydrothermal treatment and subsequent activation route from abandoned paper cup, and then paper cup derived carbons are used as scaffolds to fabricate serial carbon/Se composites. The optimal composite presents unique 3D porous structure, with amorphous selenium uniformly confined into the micropores of carbon. As the cathode materials of Li-Se battery, this composite reveals an initial reversible discharge capacity of 517.2 mAh g −1 at 0.2C, and a capacity value of 431.9 mAh g −1 can be retained after 60 cycles. Even at a high rate of 4C, a capacity value of 295.8 mAh g −1 can be obtained. By comparison, the improved electrochemical performance of the optimal composite should be attributed to reasonable porous structure and effective encapsulation of amorphous selenium.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 35
·17075-17085
·
IF 9.931
Hancheng Yuan,Yuanying Yang,Yanna NuLi,Jun Yang,Jiulin Wang
Rechargeable magnesium–selenium (Mg–Se) batteries are promising electrochemical systems with higher energy density than traditional magnesium batteries. It has been widely accepted that electrophilic selenium cathodes can only be chemically compatible with non-nucleophilic electrolytes. Herein, we report for the first time on Mg–Se batteries containing a selenized polyacrylonitrile (Se/PAN) cathode, Mg anode and nucleophilic electrolyte. The Se/PAN composite with a moderate Se content (45.37 wt%) exhibits high rate capacity and cycling stability in an easily prepared (PhMgCl)2–AlCl3 based electrolyte. It delivers an initial discharge capacity of 338.2 mA h g−1 based on the mass of the whole composite at a rate of 100 mA g−1, and the capacity can be maintained at around 188.4 mA h g−1 after 100 cycles. Even at a high rate of 400 mA g−1, a capacity of 118.3 mA h g−1 can be obtained after 800 cycles with an inappreciable capacity decay of 0.021% per cycle, which is comparable to that of previously reported Mg–Se batteries using non-nucleophilic electrolytes. The excellent performance is attributed not only to the structural advantage of the material, but to the compatible electrolyte. Well trapped Sen chains in the polymer backbone facilitate electron/ion transport and improve reaction kinetics, leading to high reactivity and utilization of Se with suppressed shuttle effect. In addition, the polymer backbone could buffer the volume changes during the electrochemical process and mitigate the structural degradation. Furthermore, the effective SEI film preserves the cathode and prevents it from irreversible reaction with the electrolyte. This work proposes combining a conductive Se/PAN cathode and a compatible electrolyte to promote the performance of Mg–Se batteries, with a view to sparking intense research interest in Mg–Se batteries with easily prepared nucleophilic electrolytes.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2018
·
IF 3.609
Zhimin Zou,Chunhai Jiang
A composite anode material consisting of a stable inner core of mesocarbon microbeads and a porous nitrogen-doped amorphous carbon shell active for lithium storage is prepared. The thin birnessite MnO 2 nanosheets hydrothermally deposited on mesocarbon microbeads are in situ replaced by polypyrrole , which is then transformed to nitrogen-doped amorphous carbon layer by calcination in nitrogen atmosphere. The surface modified mesocarbon microbeads exhibit average discharge capacities of 444 and 103 mA h g −1 at the current densities of 0.1 and 3 A g −1 , respectively, obvious higher than the corresponding values of the bare sample, 371 and 60 mA h g −1 . Moreover, the composite anode maintains a discharge capacity of 306 mA h g −1 after 500 cycles at 1 A g −1 , suggesting an excellent cycle stability. It is believed that the nitrogen-doped amorphous carbon layer has provided additional lithium storage capacity and stabilized the structure integrity of mesocarbon microbeads. This work demonstrates that the capacity and rate performance of commercial graphitic carbons can be much improved by simply introducing a nitrogen-doped carbon coating layer active for Li storage, making them attractive for high power Li-ion batteries.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Xinlu Li,Yin Liu,Xinlin Zhang,Cong Yao,Ronghua Wang,Chaohe Xu,Juan Lei
A porous spherical hybrid of TiO 2 (B)/anatase entwined by graphene nanoribbons (GNRs) was synthesized by a facile and scalable method. The entwining of GNRs can adhere on the surface of TiO 2 by electrostatic interactions and prevent TiO 2 nanoribbons from self-scrolling to nanotubes , facilitating large lithium storage and high rate capability. The TiO 2 /GNRs nanocomposite exhibited high rate capability in galvanostatic charge-discharge experiments, providing a capacity of 131 mAh g −1 with a coulombic efficiency of 99.2% at a charge rate of 10C (1 C = 335 mA g −1 ) over 1400 cycles. The appealing electrochemical performance can be attributed to the synergistic effect of TiO 2 nanoribbons entwined by GNRs.
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高影响因子
危险品化学品经营许可证（带存储）