ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shilun Gao,Dandan Yang,Yiyang Pan,Liyuan Geng,Shaoqi Li,Xiaohua Li,Peng-Fei Cao,Huabin Yang
As one of the highest specific capacity anode materials in lithium-ion batteries, the main technical issue for silicon (Si) based electrodes is the rapid capacity fading caused by the huge volume changes. Porous Si materials are reported to efficiently alleviate the side effects of volume fluctuation. However, the expensive precursor and complicated production process in previous reports limited their practical applications. Herein, we report a cost-efficient approach on the fabrication of porous Si via the low temperature aluminothermic reduction of low cost natural raw materials, combining the advantages of low temperature and natural materials. The porous structure of attapulgite-derived Si (Si ATP ) is well retained during the compositing process. The obtained composite electrode Si ATP /graphite@carbon (Si ATP /G@C) exhibits excellent electrochemical performance, with a reversible discharge capacity of 799 mAh g −1 after 100 cycles. To demonstrate the versatility of the approach, another natural ore, mica (MIC), was also utilized to the fabrication of porous Si (Si MIC ). As expected, the Si MIC /graphite@carbon composite electrode also exhibits high specific capacity (697 mAh g −1 after 100 cycles), superior capacity retention (81% after 100 cycles based the 4th cycle), and outstanding rate capability.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xiaowei Yang,Yanfei Zou,Chen Hu,Shikun Su,Zhenghang Wang,Houhe Dong,Wenying Teng,Bing Teng,Bingtao Zhang,Degao Zhong
Cr4+-activated phosphors are important candidate materials for NIR-II light sources, but providing a suitable lattice coordination environment for Cr4+ and achieving long wavelength broadband emission remains a challenge. In this work, a series of Cr4+-activated ABO2 (A = Li, Na; B = Al, Ga) phosphors were successfully prepared. Due to the presence of only tetrahedral coordination structures available for Cr4+ to occupy in the matrix crystal ABO2, the valence state and luminescence stability of Cr4+ are effectively guaranteed. Through the cation substitution design of A-site (Na → Li) and B-site (Ga → Al), the [BO4] tetrahedron is distorted and expanded, which degrades the symmetry of the Cr4+ coordination crystal field. Consequently, the central wavelength of the Cr4+ emission peak is tuned from 1280 to 1430 nm, and the fwhm is significantly extended from 257 to 355 nm. Thebroadband NIR-II light sources constructed with LiAlO2: 0.03Cr4+ and NaGaO2: 0.03Cr4+ phosphors verify their important potential applications in nondestructive testing and biological imaging.
研究领域:
材料科学
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光学材料
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固态化学
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光子学
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近红外光源
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Journal of Materials Research and Technology-JMR&T
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2022
·
IF 6.267
Yuancai Xu,Guangyu Li,Wenming Jiang,Junmin Zhan,Yang Yu,Zitian Fan
Generally, sand casted Al–Li alloy castings have very serious problems in pore defect and interfacial reaction, remarkably weakening the Al–Li alloy castings quality. How to solve these problems is always a challenge. In this paper, a novel inorganic binder coating containing lithium silicate solution binder and silicon carbide powder on the surface of the sand mold was developed to eliminate pore defect and prevent interfacial reaction of the sand casted Al–Li alloy castings. The effective mechanism of the inorganic binder coating on the pore defect and interfacial reaction was discussed. The obtained results showed that the inorganic binder coating formed a thin shell on the surface of the sand mold after pouring, which can effectively prevent the metal-mold interface reaction of the sand casting Al–Li alloy and significantly reduce the porosity defects. Among them, the Al–Li alloy casting prepared using the inorganic binder coating consisting of the lithium silicate binder and silicon carbide powder basically had no pore defects, and the porosity was only 3.73%, which was 66.7% lower than that of the casting prepared by the sand mold without any treatment. Moreover, the interface reaction of the Al–Li alloy and sand mold was fully eliminated, which was attributed to the low overall atomic diffusion rate of the silicon carbide based on molecular dynamics simulation results.
研究领域:
材料科学
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金属铸造技术
·
表面工程
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Journal of Environmental Chemical Engineering
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2026
·
IF 7.2
Na Wang,Jieyu Zhao,Hankun Zhang,Tianlei Wang,Jixue Shen,Qian Kang,Longfeng Tao,Xi Yue,Chuncheng Yang,Hongchao Li,Changjiang Liu
The growing demand for lithium batteries promotes the generation of a large amount of spodumene leached residue (SLR) in the lithium extraction industry, which leads to potential environmental challenges. To seek a proper treatment strategy for SLR, its ion-exchange behaviors were investigated systematically in solutions containing Li + , Na + , K + , Ca 2+ , and Mg 2+ . The results indicated that the SLR exhibited a pronounced positive selective response toward Li + , resulting in a Li 2 O content of 0.74%-1.86% after ion-exchange in the mixed-cation system. Moreover, a proper adjustment of solution alkalinity can further enhance H + /Li + ion-exchange, significantly improving the exchange efficiency to a maximum Li 2 O content of 8.44%. Repeated experiments as well as industrial SLR indicated good re-utilization potential. The present work provides a novel pathway for the resource utilization of SLR and offers a feasible new approach for lithium recovery from complex ion systems.
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Science China-Chemistry
·
2026
·
IF 9.8
Wang Nan,An Tinghui,Li Jiaqi,Wang Yuhao,Xiang Dong,Cai Kedi
Cu-based electrocatalysts are promising for the electrocatalytic CO 2 reduction reaction (eCO 2 RR) to realize valuable chemicals production. Here, a Mg-doped Cu based electrocatalysts via transient CO 2 pulsed laser (L 4 -Mg/Cu x O) was synthesized for highly selective eCO 2 RR to ethanol (C 2 H 5 OH). The synergistic effect of Mg-doping and transient CO 2 pulsed laser irradiation enables excellent eCO 2 RR performance, realizing Faradaic efficiencies (FE) of 52.2% and 74.1% for C 2 H 5 OH and C 2 products under a high current density of 298.9 mA cm −2 , respectively. Operando Raman spectroscopy and DFT simulations results confirm that Mg-doping strategy suppresses the hydrogen evolution reaction (HER), enhances CO adsorption, elevates local pH and accelerates H 2 O dissociation, which could be beneficial for promoting OC–CO coupling and proton supply in eCO 2 RR. Furthermore, Mg incorporation induces electron delocalization in which electron accumulation on the C atom of *CHCOH intermediate and its enhanced p-d orbital coupling with Cu interface, which stabilizes the C–O bond from breakage and selectively favours the C 2 H 5 OH pathway, thus decoupling the selectivity between C 2 H 5 OH and ethylene. When employed in Li-CO 2 batteries, L 4 -Mg/Cu x O delivers 20480 mAh g −1 discharge capacity and cycling stability over 187 cycles. This work presents a universal strategy for regulating eCO 2 RR selectivity through precise laser energy delivery, demonstrating significant potential for renewable energy conversion and storage.
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Journal of Energy Storage
·
2026
·
IF 10.7
Ying Xu,Xiu Liu,Ling Chen,Guojing Zang,Jinhao Xie,Zhongxin Liang,Yuxin Luo,Xiangyu Sun,Zishou Zhang
Designing advanced polymer binders offers an effective route to mitigate the severe volume expansion of high-energy-density micron silicon (SiMP) anodes for practical applications. However, most existing binder studies prioritize mechanical robustness while overlooking ionic conductivity, which is equally critical for electrochemical performance. Here, we report a multifunctional polymer binder formed by a synthesized polyurethane-based polymer, polyphenol polyurethane (PUTA) and polyacrylic acid (PAA), aiming to achieve a synergistic balance between high ionic conductivity and mechanical integrity. PUTA integrates poly tetramethylene ether glycol (PTMEG) soft segments for simultaneous Li + transport facilitation and elastic stress relief, while tannic acid (TA) is introduced to serve as a branched, rigid anchoring center within the hard segment to provide abundant phenolic hydroxyl groups for forming a dynamically reversible, physically cross-linked hydrogen-bonded network upon blending with PAA, simultaneously ensuring structural robustness, uniform stress distribution, and self-healing of microcracks during cycling. As a result, the Si anodes enable over 90% capacity retention across a broad current density spectrum, from 0.5C to 4C. The augmented PTMEG segment, which leads to superior Li + diffusion in dynamics tests surging to 9.44 × 10 −10 cm 2 s −1 , has certified its ability of Li + transportation. Moreover, the full battery with LFP loading at 13.05 mg cm −2 as cathode and SiC1800 as anode also boasts impressive long-term cycling stability.
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ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 32
·43897-43906
·
IF 7.8
Li Ling-Yun,Zhu Zhi-Jie,Shen Ming-Yuan,Wu Tao,Li Wen-Cui
Mn-rich P2-type oxides offer high capacity via Mn redox, yet their commercial viability is stalled by Jahn−Teller distortions and structural instability. To overcome these hurdles, a pillaring strategy is employed to anchor the layered framework, effectively suppressing lattice strain and ensuring long-term cycling stability. Here, we regulate the coordination chemistry of a multielement co-doped P2 framework by coupling Ca/Mg/Ni/Ti substitution with controlled Li + occupation in the Na layer and systematically tune the composition as Na 0.8 Li 0.2 Ca 0.025 Mg 0.05 Ni 0.1 Mn 0.75 Ti 0.05 O 2 (NMNMT-20Li). The optimized NMNMT-20Li activates the reversible anionic redox above 4.0 V and delivers the highest reversible capacity of 120 mAh g −1 . In situ XRD evidences a solid-solution-like evolution without a phase transition and an ultra-low unit-cell volume change of ∼0.9% within 2.0−4.3 V. In situ distribution of relaxation times (DRT) reveals highly reversible charge-transfer and cathode−electrolyte interphase resistances. Density functional theory (DFT) calculation identifies interlayer Li as a “pillar” that smooths electrostatic potential between layers and lowers Na + migration barriers, while excessive Li induces transport blocking. Furthermore, the NMNMT-20Li || HC full cell exhibits a high initial energy density of 241.3 Wh kg −1 and retains 97.71% capacity after 200 cycles, demonstrating its strong practical promise.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Lu Yu,Xiaomeng Liu,Rongping Yun,Min Wang,Xu Xiang
Oilfield brine, a by-product of oil and gas extraction, contains valuable resources such as Li + , K + and Ca 2+ , offering potential utilisation benefits but also presenting separation challenges. We developed a reaction-coupled separation strategy to separate Ca 2+ and Li + while simultaneously synthesising a calcium-based layered double hydroxide (Ca-based LDH) from the brine. This technology enables the recovery of over 90 % of Ca 2+ into the solid product, with 98.5 % of Li + retained in the liquid phase, achieving highly efficient separation of Ca 2+ and Li + . The resulting Ca-based LDH demonstrated excellent capacity for removing heavy metals, such as Cu 2+ , Ni 2+ and Zn 2+ , from electroplating wastewater. The removal capacities reached up to 384.2 mg/g for Cu 2+ , 319.3 mg/g for Ni 2+ and 367.9 mg/g for Zn 2+ . In both single-cation and mixed-cation wastewaters, metal concentrations were dramatically reduced to parts-per-billion (ppb) levels. Kinetic studies indicated rapid adsorption behaviour of Cu 2+ , Ni 2+ and Zn 2+ by the Ca-based LDH. Mechanistic analysis revealed that Ca 2+ ions in the LDH layers are isomorphously substituted by Cu 2+ , Ni 2+ and Zn 2+ from the solution, forming Cu-, Ni- and Zn-containing LDHs with enhanced structural stability. Additionally, the released Ca 2+ ions precipitate with CO₃ 2− , derived either from intercalated anions or carbonate in the water. Such conditions promote further substitution of Ca 2+ in the LDH layers by Cu 2+ , Ni 2+ and Zn 2+ , resulting in robust metal removal and ultralow residue concentrations in the treated wastewater. This work presents an efficient, economical and sustainable approach for the simultaneous separation and utilisation of oilfield brine resources and treatment of electroplating wastewater.
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PHYSICAL REVIEW B
·
2019
·Vol. 100
·期 17
·174519
·
IF 3.736
B. Lei,L. K. Ma,N. Z. Wang,C. S. Zhu,J. H. Cui,Z. L. Sun,D. H. Ma,H. H. Wang,M. Z. Shi,J. J. Ying,X. H. Chen
Manipulating collectively ordered electronic and magnetic states in a correlated system is at the core of condensed matter physics. Besides tuning the carrier density of a crystal, the latest developed field-effect transistor (FET) with a solid ion conductor (SIC) can also drive ions into the crystal and lead to structural transformations that are difficult to access with conventional methods including conventional field-effect transistors. Here, we exploit the SIC-FET gating technique to realize a metastable phase in (Li,Fe)OHFeS thin flakes, and achieve a rich phase diagram involving superconductivity, soft ferromagnetism, and hard ferromagnetism. With the injection of Li ions into the thin flake, the superconductivity is gradually suppressed and a soft ferromagnetic phase with new crystal structure sets in, evidenced by the anomalous Hall effect and magnetoresistance measurements. Further injecting Li ion drives the soft ferromagnetic state into a hard ferromagnetic state, where different types of magnetic interactions dominate due to the simultaneous tuning of carrier density and magnetic Fe ion concentration in the Li ion injection process. Our paper paves a way to control structural phase transformations as well as physical properties by the electric field. These findings demonstrate the superior performance of the SIC-FET in regulating the physical properties of layered crystals and its potential applications for multifunctional devices.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 14
·e2213130120
·
IF 11.1
Honghuai Sun,Qingming Song,Zhenming Xu
The value of considerable residual energy in waste Li-ion batteries (WLIBs) is always neglected. At present, “this energy” is always wasted during the discharge process of WLIBs. However, if this energy could be reused, it would not only save a lot of energy but also avoid the discharge step of recycling of WLIBs. Unfortunately, the instability of WLIBs potential is a challenge to efficient utilization of this residual energy. Here, we propose a method that could regulate the cathode potential and current of the battery by simply adjusting the solution pH to utilize 35.08%, 88.4%, and 84.7% of the residual energy for removing heavy metal ions from wastewater, removing Cr (VI) from wastewater, and recovering copper from the solution, respectively. By taking advantage of the high internal resistance R of WLIBs and the sudden change of battery current I caused by iron passivation on the positive electrode of the battery, this method could induce the response of overvoltage η (η = IR) inside the battery at different pH levels to regulate the cathode potential µ of the battery to the three intervals. The potential ranges of the battery cathode corresponding to pH < 3.4, pH ≈ 3.4, and pH > 4 were µ > −0.47V, −0.47V < µ < −0.82V, and µ < −0.82V, respectively. This study provides a promising way and theoretical basis for the development of technologies for reusing residual energy in WLIBs.
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NANOTECHNOLOGY
·
2022
·Vol. 34
·期 8
·085401
·
IF 3.953
Hongna Jia,Yao Wang,Shuya Zhao,Haipeng Wang,Na Ju,Xinyue Zhang,Hong Li,Zejun Sun,Hong-bin Sun
Carbon materials derived from metal-organic frameworks have attracted increasing attention as anodes for energy storage. In this study, Fe, Ni-doped ZIF-8 is carbonized at high temperature to obtain bimetallic Fe and Ni modified tension -relaxed carbon (FeNi@trC). Fe and Ni have opposite structural modification effects when the metal ions are doped into the ZIF-8 dodecahedron. The obtained carbon material maintains the regular dodecahedron morphology, which means the relaxation of tension and strong thermal stability during annealing. Moreover, the presence of nickel enhances the carbonization degree and electrochemical stability of FeNi@trC, while the calcination of the tensive ZIF-8 precursor offers more defect sites. The discharge capacities of FeNi@trC materials are stable at 182.9 mAh·g−1 and 567.9 mAh·g−1 for sodium-ion batterie (SIB) and lithium-ion batterie (LIB) at 0.05 A·g−1. Compared with the current density of 0.05 A·g−1, the discharge capacity of SIB and LIB attenuates by 29.4% and 55.9% at 1 A·g−1, respectively, and the FeNi@trC shows good performance stability in the following cycles.
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Qihan Meng,Lei Wang,Fei Chen,Qingfei Hao,Xudong Sun
Ramsdellite-type Li 2 Ti 3 O 7 (R-Li 2 Ti 3 O 7 ) hollow microspheres were successfully prepared for the first time by the flame melting method. The hollow microspheres are 50-120 μm in diameter and about 10 μm in shell thickness. The spherical morphology allows for a high tapping density (1.25 g cm −3 ), and the hollow structure increases the specific surface area which is beneficial to the electrochemical properties. Thus, the prepared R-Li 2 Ti 3 O 7 shows excellent electrochemical properties even at high tapping densities. A specific capacity of 212.1 mAh g −1 can be obtained at a rate of 0.1 C, and the capacity retention after 500 cycles at 1 C is 94.6% with a specific capacity of 150.3 mAh g −1 . The flame melting method is effective for the preparation of Li 2 Ti 3 O 7 hollow spheres which showed good performance as the anode for lithium-ion batteries.
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