JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Chunhai Jiang,Jing Zhao,Huiqing Wu,Zhimin Zou,Renzhong Huang
Hybrid anodes with Li 4 Ti 5 O 12 nanoparticles uniformly embedding in a mesoporous activated carbon matrix are prepared by CO 2 activation of copolymerized resorcinol and hexamethylenetetramine loaded by lithium acetate and tetrabutyl titanate . The Li 4 Ti 5 O 12 /activated-carbon hybrid anodes show increased capacity retention as the activated carbon content in the composite increases, although their overall specific capacity decreases gradually. The hybrid anode with an activated-carbon content of 54 wt% exhibits the highest capacity retention of 67% at 4 A g −1 referencing to that at 0.1 A g −1 . When coupling it with commercial AC cathode, the Li-ion capacitor displays an outstanding high energy density of 38 Wh kg −1 even at a high power density of 7964 W kg −1 . Moreover, an energy density retention of 90.8% after 2000 cycles at 1 A g −1 is preserved, demonstrating its very stable cycle performance. The results reported in this work indicate that the Li 4 Ti 5 O 12 /activated-carbon hybrids prepared by the proposed copolymerization and post-activation process may be very promising anode materials of Li-ion capacitors designed for high power applications.
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高影响因子
ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Yin Zhang,Jia-Jia Yuan,You-Zhi Song,Xue Yin,Chuang-Chao Sun,Li-Ping Zhu,Bao-Ku Zhu
Surface chemistry of the separator plays an important role in the performance of the lithium ion battery separator, which not only influence the wettability with the electrolyte, but also the lithium ion migration through the separator. Here we developed a simple method to modify the polypropylene separator with tannic acid (TA) and polyethyleneimine (PEI). A thin and uniform TA/PEI layer was formed onto the surfaces of the separator through a simple assembly process without destroyed the microstructure. The modified PP separator showed excellent wettability, high ambient ionic conductivity (0.95 mS cm −1 ) and lithium-ion transference number (0.44), indicating that the TA/PEI layer played a role in the lithium ions migration. The possible mechanism of the surface promoting lithium ion migration was discussed in this paper. The battery performances of the modified separator were also conducted. As a result, cells with the TA/PEI-coated PP separator displayed superior cycle stability and rate capability.
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高影响因子
ADVANCED POWDER TECHNOLOGY
·
2014
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IF 1.642
Renping Cao,Kangbin Chen,Qianglin Hu,Wensheng Li,Hui Ao,Chunyan Cao,Tao Liang
A series of Sr (1 − x − y − z ) MoO 4 : x Eu 3+ , y Bi 3+ , z R + (R + = Li + , Na + , and K + ) phosphors are prepared through solid-state reaction method in air. Eu 3+ doped SrMoO 4 phosphor can show red emission at ∼616 nm under excitation 275 nm and 397 nm light due to the 5 D 0 → 7 F 2 transition of Eu 3+ ion, and its emission intensity can be enhanced after co-doping Bi 3+ owing to energy transfer between Bi 3+ and Eu 3+ ions. The mechanism of energy transfer is discussed by the schematic energy level diagrams of Bi 3+ and Eu 3+ ions. The optimal composition in Eu 3+ and Bi 3+ co-doped SrMoO 4 phosphors is determined to be (Sr 0.92 Eu 0.05 Bi 0.03 )MoO 4 . The emission intensity of SrMoO 4 :Eu 3+ , Bi 3+ phosphor is found to be further improved by using Li + , Na + , and K + ions as charge compensators. These experiment results in the paper are helpful to develop novel and high-efficiency phosphors for white light-emitting diodes.
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高影响因子
Energies
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2013
·Vol. 6
·期 7
·3466-3480
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IF 1.844
Haibo Tan,Shengping Wang,Du Tao,Zhigao Yang
A novel technique to prepare carbon/sulfur composites as cathode materials for Li/S batteries is proposed, which we call the ‘solution evaporation concentration crystallization’ method. Three composites with different S loadings were prepared, subject to two different solvent evaporation rates from acetylene black (AB)/sulfur in carbon disulfide solutions. X-ray diffraction, environmental scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller measurements all show that the porous AB structure is well-filled with S. Composites prepared at a lower solvent evaporation rate with 50 wt % S content, had good electrochemical properties, with 1609.67 mAh g−1in the initial cycle and 1115.69 mAh g−1after 100 cycles. Composites with better dispersibility at a low solvent evaporation rate can effectively prevent polysulfide from dissolving in the electrolyte, and serve to stabilize the structure of the S cathode during the charge-discharge process.Keywords:sulfur/carbon composites;solution evaporation concentration crystallization method;lithium sulfur batteries
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高影响因子
Journal of Physical Chemistry C
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2016
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IF 4.509
Zheng-Yao Li,Jicheng Zhang,Rui Gao,Heng Zhang,Lirong Zheng,Zhongbo Hu,Xiangfeng Liu
The effects of Li substitution for Ti on the structure and electrochemical performances of Co-free Na0.67Mn0.55Ni0.25Ti0.2–xLixO2 (x = 0, 0.1, 0.2) layered cathode materials for sodium ion batteries have been comprehensively investigated. X-ray diffraction and Rietveld refinement results demonstrate that Li mainly occupies TM (TM = transition metal) sites in the crystal structure to maintain the P2 structure majority and a small amount of Li atoms enter Na sites to generate some O3 phase. The discharge voltage, reversible capacity, rate capability, cycling performance, and Coulombic efficiency all have been improved by Li substitution, which can be largely attributed to the integration of P2 and O3. Li substitution also raises the average discharge voltage from 2.6 to 3.1 V. Na0.67Mn0.55Ni0.25Li0.2O2 (L02) can deliver an initial capacity of about 158 mA h g–1 at 0.05C (12 mA g–1) in comparison with the Li-free sample (147 mA h g–1). Even at the high rates of 480 (2C), 1200 (5C), and 1920 (8C) mA g–1, L02 can also display ca. 93, 65, and 38 mA h g–1 discharge capacities, respectively. The rate capability is higher than what is reported in the previous Li-substituted cathode materials. In addition, Li substitution in transition-metal sites generates more defects to maintain the charge neutrality, which enhances the electronic conductivity and also has a positive effect on the Na ion diffusion coefficient. The electronic conductivity and Na ion diffusion coefficient have been enhanced by 122% and 29%, respectively, with the substitution of Li for Ti. Our results also show that the oxidation peaks become sharper with increasing Li content, which indicates the feasibility of Na ion intercalation/deintercalation in the integrated P2/O3 phase. This study also offers some new insights into designing high-performance cathode materials for sodium ion batteries.
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Chemistry-An Asian Journal
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2016
·Vol. 11
·期 8
·1273-1280
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IF 4.592
Chenguang Dai,Jing Ye,Shiyong Zhao,Ping He,Haoshen Zhou
Graphical What′s on tap today ? Li 4 Ti 5 O 12 (LTO) and 0.5 Li 2 MnO 3 ⋅0.5 LiNi 0.4 Co 0.2 Mn 0.4 O 2 (NCM) microspheres show a good electrochemical performance and high tap density. The Li 4 Ti 5 O 12 / x Li 2 MnO 3 ⋅(1- x ) LiMO 2 lithium-ion battery system can offer a higher energy density than Li 4 Ti 5 O 12 /LiCoO 2 cells. In this work, we propose an effective way to prepare nanosized Li 4 Ti 5 O 12 (LTO) microspheres and 0.5 Li 2 MnO 3 ⋅0.5 LiNi 0.4 Co 0.2 Mn 0.4 O 2 (NCM) microspheres by similar spray-drying methods. Both obtained materials are accumulated by primary nanoparticles and show a spherical morphology with particle distribution of 10–20 μm. The LTO microspheres deliver a tap density of 1.04 g cm −3 , while the tap density of NCM microspheres is 2.07 g cm −3 , which means an enhanced volumetric energy density. The as-prepared LTO microspheres have a reversible capacity of 170 mA h g −1 at 0.1 C and a capacity retention of 97 % after 250 cycles at 1 C. The NCM microspheres have an initial discharge capacity of 270 mA h g −1 with a corresponding Coulombic efficiency of 88 % at 0.03 C. Both materials show a relatively good rate capability. The Li 4 Ti 5 O 12 /0.5 Li 2 MnO 3 ⋅0.5 LiNi 0.4 Co 0.2 Mn 0.4 O 2 cells deliver a high cathode specific capacity of 273 mA h g −1 and good initial Coulombic efficiency of 88 % at 0.03 C, and can be developed for powering hybrid and plug-in hybrid vehicles.
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PubMed
高影响因子
ChemElectroChem
·
2017
·Vol. 4
·期 10
·2500-2506
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IF 4.136
Yao Du,Chun Liu,Shuijing Sun,Songping Wu
Graphical Harsh reality : A facile solution route to monodisperse MnO@3MnFe 2 O 4 @rGO is established. As anode materials of Li-ion batteries, MnO@3MnFe 2 O 4 @rGO delivers remarkable cycling performances. Therefore, MnO@3MnFe 2 O 4 @rGO nanocomposites can be considered promising battery materials that can be operated in harsh environments. A facile high-temperature solution route to a monodisperse core-shell structure of MnO (core) and MnFe 2 O 4 (shell) (abbreviated as MFO) nanoparticles anchored on reduced graphene oxide (rGO) has been established. Subsequently, MnO@MnFe 2 O 4 @rGO nanocomposites are utilized as advanced anode materials for high-performance Li-ion batteries. MnO@3MFO@rGO containing 22.5 wt% of the rGO composite (with a 1 : 3 molar ratio of MnO/MFO) as the electrodes delivered a remarkable cycling performance, that is, 587.8 mAh g −1 at a current density of 200 mA g −1 after 200 cycles at ambient temperature with an ultralow capacity fading (0.10 % per cycle). More importantly, the electrodes afforded excellent capacity stability under various operation temperatures (ca. −20 to 70 °C), such as an excellent reversible capacity of 1067 mA h g −1 at a current density of 500 mA g −1 after 300 cycles at 60 °C, and remarkable low-temperature performance of a reversible capacity of 208.7 mA h g −1 at a current density of 200 mA g −1 at −20 °C. Therefore, MnO@3MFO@rGO nanocomposites are considered as promising battery materials that can be operated in harsh environments.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yujiao Guo,Yue Yu,Ping Ning,Jiangzhao Chen
Spinel LiMn 2 O 4 has the potential to be used as a cathode material in lithium-ion batteries because of its affordability, low toxicity, and excellent charge/discharge capability. However, severe capacity attenuation results from the degradation of its long-cycle and high-rate performance caused by the Jahn-Teller distortion and Mn dissolution. Herein, a simple solid-state combustion process is used to successfully prepare the Mg 2+ -Al 3+ co-doped LiMn 2 O 4 with truncated octahedral morphology. The Jahn-Teller distortion is inhibited by the stable Mn-O framework and the decreased lattice constant, which in turn lowers the dissolution of Mn. Moreover, Mg 2+ -Al 3+ co-doped LiMn 2 O 4 have lower activation energy and greater Li + diffusion coefficient. As a result, the optimized LiMg 0.03 Al 0.10 Mn 1.87 O 4 delivers satisfied initial capacity of 102.1 mAh‧g −1 with a capacity retention of 76.2 % after 1000 cycles at 10 C. Even at the ultra-high rate of 15 C and 20 C, Mg 2+ -Al 3+ co-doped sample also remain desired structure stability and cycling performance, which remains 73.8 % of its original capacity after 1000 cycles at 20 C. This work provides a reference for developing high-performance and stability cathode materials for lithium-ion battery.
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高影响因子
GREEN CHEMISTRY
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2024
·
IF 9.3
Yuan Qiao,Ali Reza Kamali
Porous structures, such as prous Si electrodes required for high-performance Li-ion batteries, are often produced through envirionmentally problematic processes. In this study, an innovative approach is employed for the green preparation of high-performance porous Si electrodes via thermal treatment of an electrode composed of Si nanoparticles, polyimide (PI), and nanostructured terephthalic acid (TPA). During the process, TPA sublimes at around 318 °C, resulting in a compact yet porous electrode, enhanced by cross-linked PI binder. Moreover, TPA can be regenerated through the condensation of vaporised monomers, supporting a circular economy for the clean preparation of the advanced electrode. Despite the simplicity of this method, the resulting electrode (Si@PI@nano-TPA@E-350) exhibits a remarkable Li-ion storage performance, demonstrating a reversible capacity of 2355 mAh g⁻¹ at 0.2 A g⁻¹ after 120 cycles, along with a reduced charge transfer resistance (Rct) of 99 Ω. This is in contrast to the electrode prepared without TPA (Si@PI@E-350), which only achieves a capacity of 1268 mAh g⁻¹. The morphological features of the TPA used significantly impact the electrode's performance. A full cell composed of Si@PI@nano-TPA@E-350 as the anode and LiFePO₄ as the cathode exhibits a reversible capacity of 151 mAh g⁻¹ relative to the total mass of the anode and cathode at 0.2 A g⁻¹ after 50 cycles, with a capacity retention of 97.8%, demonstrating an enhanced energy density of 455 Wh kg⁻¹. The article presents a green method for sustainably fabricating porous structures for efficient energy storage and a wide range of other applications.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
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IF 6.2
Juan Cai,Boyan Zhang,Jiatao Dang,Yunpeng Zhao,Dingcheng Liang,Qiang Xie,Jinchang Liu
The migration, transformation, and enrichment of strategic metal elements in coal in the process of coal processing and utilization are significant for their effective extraction and application. In this work, the migration, transformation, and enrichment of Li, Ga, Ge, In, and Re during coal pyrolysis were investigated by six-step sequential chemical extraction. The results showed that Li mainly exists in a residual state in raw coal and pyrolytic products under 500 ℃; however, the content of sulfide state Li increases largely when the pyrolysis temperature exceeds 500 ℃. Ga mainly enriches in residual form, and the content of Ga in the residual state rises with the pyrolysis temperature increasing. Ge mainly presents in the form of carbonate-binding state, sulfide state, and residual state. As the temperature rises to higher than 500 ℃, Ge combines with the carbon and oxygen compounds produced by pyrolysis to form a carbonate-binding state, resulting in a significant increase in its content. The content of Ge in the residual state also increases significantly. The ratio of carbonate-binding state and organic state In gradually decreases with the increase of pyrolysis temperature, while that of residual state In gradually increases. Due to the low content of Re, the reliability of the test results is poor. However, Re may exist in sulfide, organic, and residual states. With the pyrolysis temperature increasing, Li, Ga, Ge, In, and Re in pyrolysis products are more likely to combine with aluminosilicate than those in raw coal.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 24
·12144-12148
·
IF 8.867
Qianqian Yang,Jie Zhou,Genqiang Zhang,Cong Guo,Meng Li,Yongchun Zhu,Yitai Qian
Sb nanoparticles encapsulated in 1-D N-doped porous carbon (denoted as Sb/NPC) have been fabricated by an in situ nanoconfined replacement reaction between SbCl3 and the intermediate Ni/NPC, in which Ni/NPC was obtained by annealing the hydrothermally synthesized nickel–nitrilotriacetic acid (Ni–NTA) precursor in an argon atmosphere. The Sb nanoparticles with a size of 10–20 nm were uniformly encapsulated in the 1-D N-doped porous carbon scaffolds. When the Sb/NPC composite was applied as an anode material in the batteries, it exhibited a high reversible capacity of 556 mA h g−1 at 200 mA g−1 after 100 cycles for Li-ion batteries (LIBs) and a reversible capacity of 400.9 mA h g−1 at 100 mA g−1 after 100 cycles for Na-ion batteries (NIBs). Such enhanced electrochemical performance of the designed Sb/NPC can be attributed to the synergistic effect between uniformly dispersed Sb nanoparticles and the 1-D N-doped porous carbon matrices.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yongbin Xu,Yu Tian,Shan Guo,Binchao Xu,Yan He,Zhijun Zhao,Xinyi Yuan,Yuxiao Wang,Jianwei Li,Xiaojun Wang,Peng Wang,Zhiming Liu
Recycling and utilization of valuable metals from spent ternary lithium-ion batteries possess significant economic and environmental benefits. Recycling of valuable metals effectively compensates for the high costs, poor selectivity, and low utilization rates of active sites present in single Pt-catalyzed hydrogen evolution reaction (HER). Hence, developing high-efficiency catalysts with multi-metal active centers to synergistically promote H 2 O dissociation and H 2 evolution is critical for accelerating alkaline HER. In response, we first report an ultra-small high-entropy alloys (HEAs) nanoparticle catalyst by mixing valuable metals (Ni, Co, Mn) recycled from spent ternary Li-ion batteries with Pt driven by non-equilibrium high-temperature-shockwave. As expected, due to high-entropy coordination environment, well-designed NiCoMnPt HEAs catalyst possesses multiple activated metal centers, thus achieving much-improved HER performance (ultra-low overpotential of 16.6 mV@10 mA cm −2 ). Experimental and theoretical studies indicate the mutual substitutions among NiCoMnPt atoms cause lattice distortion and induce electronic coupling effect, which optimizes the electronic structure of Pt and makes the deeply activated Pt as fundamental active center for H 2 O dissociation. Accompanied by electrons redistribution, NiCoMn as electron-rich centers further contribute to reducing the H 2 desorption energy barrier and greatly accelerating the hydrogen evolution efficiency. Impressively, this work provides fresh ideas for constructing high-efficiency electrocatalysts beyond HER.
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危险品化学品经营许可证（带存储）