PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2023
·Vol. 25
·期 46
·31754-31769
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IF 3.3
Wenhao Pan,Changjiang Yang,Lei Zhou,Xiaolan Cai,Yankun Wang,Junhao Tan,Jun Chang
This study aimed to address the challenges associated with silicon (Si) anode materials in Li-ion batteries, such as their large volume effect and poor electrical conductivity. To overcome these limitations, a novel composite microsphere called pSi/Ag was developed using quartz waste through a combination of high-energy ball-milling, spray drying, and magnesiothermic reduction techniques. The morphology and structure of the pSi/Ag composite were thoroughly characterized using various methods, including X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. The results revealed that the Ag nanoparticles were uniformly dispersed within the porous micron-sized Si sphere particles, leading to enhanced electrochemical performance compared to pure porous silicon that did not undergo the spray drying process. The use of micron-sized Si prevented the excessive formation of the solid electrolyte interphase film, and the pSi/Ag-5 anode, prepared with 5 wt% AgNO3 as a precursor, demonstrated an impressive initial Coulombic efficiency of 92.8%. Moreover, a high specific capacity of 1251.4 mA h g−1 over 300 cycles at a current density of 4000 mA g−1 was attributed to the improved conductivity provided by the Ag nanoparticles in the Si matrix. The straightforward synthesis method employed in this study to produce pSi/Ag presents a promising approach for the future development of high-performance silicon anodes in Li-ion batteries.
研究领域:
材料科学
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储能
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纳米技术
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电化学
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电池技术
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高影响因子
DESALINATION
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2026
·
IF 9.9
Yi Yuan,Tong Wu,Lijuan Hu,Yajie Ding,Jianqiang Wang,Fu Liu
Nanofiltration membranes were prepared by regulating monomer diffusion. • Nanofiltration membranes with tailored pore distribution and thinner structure achieved • Nanofiltration membranes exhibit an exceptional Li + /Mg 2+ selectivity of 173. • Nanofiltration membranes exhibit a high water permeance of 15.4 L·m −2 ·h −1 ·bar −1 . Amid the urgent demand for lithium resources driven by the global carbon neutrality goals and the rapid development of the new energy industry, efficiently separating and extracting lithium from salt lakes has emerged as a challenge. Current nanofiltration membranes exhibit issues such as low selectivity, limited permeance, and broad pore size distribution in Li + /Mg 2+ separation. This study proposes a novel strategy for the synergistic control of interfacial polymerization by combining electrically generated in-situ bubbles with surfactants. Electrolysis of water generates negatively charged hydrogen bubbles that attract positively charged amine monomers via electrostatic interaction. Synergized by electric field forces and the buoyancy of the bubbles, the amines are transported to the water/hexane interface for enrichment. Meanwhile, a surfactant added to the oil phase forms a monolayer at the oil-water interface, reducing surface tension and promoting the diffusion of the amine monomers. These mechanisms synergistically modulate interfacial polymerization kinetics, optimizing polyamide density and pore size distribution. The resulting membrane demonstrates an excellent Li + /Mg 2+ selectivity of 173 and high water permeance of 15.4 L·m −2 ·h −1 ·bar −1 . This work presents a novel and feasible strategy that holds promise for achieving large-scale production and advancing the development of efficient lithium extraction technologies from salt lake brine.
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ACS Applied Energy Materials
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2023
·
IF 6.4
Junqin Xie,Kangning Liu,Sha Fu,Xian-Xiang Zeng,Congshan Zhou,Tong-Tong Zuo,Xiongwei Wu
Among all energy storage systems, lithium metal batteries (LMBs) show great advantages in terms of energy density. Nevertheless, the challenges of lithium metal anodes, namely, dendrite formation and low Coulombic efficiency, hinder the practical application of LMBs. In this work, we used the ZnO/carbon shell/carbon cloth as a host for the lithium metal anode. The introduction of ZnO sites reduces the nucleation barrier of lithium deposition, and the existence of a 3D current collector alleviates the volume change during lithium plating/stripping. In addition, the combination of ZnO/C and 3D carbon cloth decreases the local current density and contributes to uniform lithium plating/stripping. The half cells assembled with modified carbon cloth electrodes cycle for more than 125 cycles with a high Coulombic efficiency of 99.34%, even under a high areal capacity of 6 mA h cm–2. By and large, our work provides a simple and effective strategy to modify the current collector for high Li-content anodes.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Xinjian Li,Yanhui Su,Yong Ma,Le Wei,Ying He,Yuting Gu,Shiwei Mei,Qiaoqiao Mu,ChengYuan Peng,Yang Peng,Zhao Deng
Photo-assisted charge/discharge has witnessed marked success in Li-O 2 batteries (LOBs) to overcome the sluggish kinetics of triphasic reactions at the cathode, but challenges remain to develop high-efficiency but low-cost photocathode catalysts. Herein, a photoactive electron mediator is applied, for the first time, as bifunctional photocathode catalyst in solar-assisted LOBs. The facilely synthesized tris(2,2-bipyridine) cobalt(II) complex (Co-bpy) manifests good electrocatalytic activity in dark and high photoactivity under illumination, concertedly affording an superior charge/discharge voltage gap of 0.12 V and round-trip efficiency of 97%. Moreover, a significantly enhanced charge/discharge reversibility was attained under illumination and attributed to the light-induced amorphization of Li 2 O 2 that further extends the cycle life. A two-circuit model is proposed to rationalize the better reduction of charge/discharge polarization at lower operating current density. This work not only extends the family of photocathode catalysts to small-molecule complexes, but also offers new insights into the mechanism of photoenergy storage in LOBs.
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Journal of Physical Chemistry C
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2023
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IF 3.7
Shuai Wang,Liuyuan Zhu,Rujie Yang,Minliang Li,Fangfang Dai,Shiqi Sheng,Liang Chen,Shanshan Liang
Lithium extraction from brine or seawater using membrane technology has attracted extensive attention in recent years. Graphene oxide (GO), as one of the two-dimensional materials, has been proven as a competitive candidate for membranes. However, the GO membranes still suffer challenges for ion sieving due to the swelling in the aqueous solution. In this work, a GO–PEI membrane with positively charged channels was constructed by polyelectrolyte polyethyleneimine (PEI) molecular chain-grafted GO nanosheets. The GO–PEI membrane showed a high selectivity of 22.2 for Li+/Mg2+, together with a competitive Li+ permeation rate of 0.09 mol m–2 h–1 in a binary permeation test. In addition, the membrane showed excellent stability during the separation process. The enhanced Li+/Mg2+ separation performance of the GO–PEI membrane could be mainly attributed to the synergistic effect of size sieving and electrostatic repulsion. We further systematically studied the influence of various variables, such as PEI molecular weight, PEI content, membrane thickness, and ion concentration, on separation performance. This work deepens the understanding of membrane ion selectivity from multiple perspectives and puts forward a strategy to design a two-dimensional membrane structure from microscopic materials.
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Hengyu Li,Yunhao Li,Meng Li,Yan Jin,Guodong Kang,Yiming Cao
Extraction of lithium from salt lakes is an important route for lithium sources. Due to the unique structure and separation mechanism, i.e., size exclusion and Donnan effect, nanofiltration (NF) is considered as a promising way to separate magnesium (Mg 2+ ) and lithium (Li + ) ions. However, the Mg 2+ /Li + separation factor of NF membrane fabricated by traditional interfacial polymerization (IP) is usually dissatisfactory. Here, a swelling-embedding-shrinking strategy was proposed to modify polyethyleneimine (PEI)/trimesoyl chloride (TMC) NF membranes using diethylenetriamine (DETA) to improve the performance in Mg 2+ /Li + separation. The pristine PEI/TMC NF membrane was swollen with methanol to increase the polyamide chain spacing followed by embedding electropositive DETA as a modifier. The charge properties and pore structure of the active layer could be regulated by optimizing the modification conditions. Within comparison to the pristine membrane (TFC-0), the pure water flux of modified NF membrane (TFC-3) increased by 63.6% because of the rougher surface and the larger pore size. Meanwhile, the embedding of electropositive DETA reduced the electronegative property of membrane surface. In consequence, TFC-3 membrane exhibited higher rejection of MgCl 2 (93.9% against 88.4%) and lower rejection of LiCl (31.0% against 32.1%), thus showing a twofold improvement in Mg 2+ /Li + separation factor ( S Li, Mg = 11.38 against 5.87). The swelling-embedding-shrinking strategy in this article provided a good reference for the modification of NF membranes in the separation of multivalent and monovalent ions.
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OPTICAL MATERIALS
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2023
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IF 3.9
Lixin Zhang,Junfeng Zhang,Yasong Cui,Yankun Lan,Jing Yu
Alkali metal doping is considered as an effective strategy in the pathway of improving the efficiency of Cu 2 ZnSn(S,Se) 4 (CZTSSe) photovoltaic materials. In this paper, Li is successfully doped into CZTSSe films in air and high efficiency devices are obtained. By X-ray diffraction and scanning electron microscopy, it can be found that the crystalline quality of CZTSSe films after Li doping is effectively improved and full and dense absorber layer crystals are obtained. In addition, TRPL also shows that the carrier lifetime of CZTSSe by doping with Li is significantly enhanced. Lithium-doped CZTSSe thin-film solar cells finally achieve a high efficiency of 9.84%. This Li doping route with simple process and superior device performance obtained provides a new idea for further development of element-rich and non-toxic CZTSSe thin film materials.
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ADVANCED FUNCTIONAL MATERIALS
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2023
·Vol. 33
·期 19
·2212150
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IF 19
Zhongsheng Wang,Chunlei Zhu,Jiandong Liu,Xinhong Hu,Yulu Yang,Shihan Qi,Huaping Wang,Daxiong Wu,Junda Huang,Pengbin He,Jianmin Ma
Tailoring inorganic components of cathode electrolyte interphase (CEI) and solid electrolyte interphase (SEI) is critical to improving the cycling performance of lithium metal batteries. However, it is challenging due to complicated electrolyte reactions on cathode/anode surfaces. Herein, the species and inorganic component content of the CEI/SEI is enriched with an objectively gradient distribution through employing pentafluorophenyl 4-nitrobenzenesulfonate (PFBNBS) as electrolyte additive guided by engineering bond order with functional groups. In addition, a catalytic effect of LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NCM622) cathode is proposed on the decomposition of PFBNBS. PFBNBS with lower highest occupied molecular orbital can be preferentially oxidized on the NCM622 surface with the help of the catalytic effect to induce an inorganic-rich CEI for superior electrochemical performance at high voltage. Moreover, PFBNBS can be reduced on the Li surface due to its lower lowest unoccupied molecular orbital , increasing inorganic moieties in SEI for inhibiting Li dendrite generation. Thus, 4.5 V Li||NCM622 batteries with such electrolyte can retain 70.4% of initial capacity after 500 cycles at 0.2 C, which is attributed to the protective effect of the excellent CEI on NCM622 and the inhibitory effect of its derived CEI/SEI on continuous electrolyte decomposition.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Wenhui Zhu,Ali Reza Kamali
Thermal oxidation in air of molybdenum disulfide (MoS 2 ) into layer structured molybdenum trioxide (α-MoO 3 ) is investigated using a combination of thermal analysis, electron microscopy , Raman, X-ray diffraction and photoelectron spectroscopy . The phase evolutions occurred during the thermal process is characterized by the surface oxidation of MoS 2 , followed by the bulk oxidation to form α-MoO 3 and the formation of Mo 17 O 47 at higher temperatures. The single-phase MoO 3 formed at optimum temperature condition is found to possess crystalline defects and considerably greater values of Li-ion storage cycling and rate performances in comparison with samples prepared at alternative temperatures and also the initial MoS 2 . This sample (P-MoO 3 -820) exhibits a charge capacity of 628 mA h g −1 after 250 cycles (100 mA g −1 ) with a Li + diffusion coefficient of 2.3 × 10 -13 cm 2 s −1 , substantially greater than that of initial MoS 2 (8.1 × 10 −16 cm 2 s −1 ). The electrochemical performance of P-MoO 3 -820 in full-cell configuration against a commercial LiFePO 4 cathode is evaluated and a specific capacity of 100 mAh g −1 after 500 cycles is recorded. This article, for the first time, discusses the thermal oxidation in air of MoS 2 as a simple and relatively clean approach to fabricate defective crystalline MoO 3 with enhanced Li-ion storage kinetics.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Bing Xue,Xiangkun Wu
The high energy density cathode material , nickel-rich layered oxide LiNi 0.8 Co 0.1 Mn 0.1 O 2 (LNCM), has been extensively researched for its potential applications. Nevertheless, its structural instability, weak conductivity and unsafe properties greatly impede its further development. To address these issues, the method of surface coating by graphene and element doping by Mg atom for LNCM is proposed, and its structural and electrochemical properties , as well as the promoting mechanism are comprehensively studied. Such as, the structural and morphological features are investigated by X– ray diffraction (XRD), Raman spectroscopy , thermogravimetric analysis (TGA), scanning electron microscopy (SEM) coupled with energy dispersive X – ray spectroscopy (EDX) and transmission electron microscopy (TEM). Characterization techniques depict the composites’ dimension, modified construction and components. Electrochemical performances are studied using cyclic voltammetry , electrochemical impedance spectroscopy , and galvanostatic charge – discharge test. The typical redox peaks of Ni 2+ /Ni 4+ and Co 3+ /Co 4+ are well-defined for LNCM@rGM, and its improved electrochemical performance compared to LNCM are demonstrated. Specifically, LNCM@rGM exhibits a higher capacity retention of 58%, maintaining a capacity of 123.3 mAh g −1 after the 200th cycle, from an initial value of 211.0 mAh g −1 . Additionally, LNCM@rGM shows a higher rate capability of 80.2 mAh g −1 at 5 C, as well as improved Li + diffusion and higher exchange current density. The findings indicate that the composite structure consisting of graphene coating and element doping shows improved electrochemical performance when exposed to an optimal heating temperature, resulting in enhanced structural stability, elevated ionic/electronic conductivity, and synergistic effects on the materials.
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Inorganics
·
2023
·Vol. 11
·期 6
·257
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IF 2.9
Rui Yan,Fangchao Liu,Zhengwen Fu
Li-SeS2batteries balance the opposing and complimentary qualities of Li-S and Li-Se batteries by having a high specific capacity and high electrical conductivity. However, there is still a lack of knowledge regarding the electrochemical characteristics of Li-SeS2all-solid-state batteries (ASSB). Herein, transmission electron microscopy (TEM) is used to reveal the electrochemistry of a Li-SeS2battery. It is discovered that, without the Polyethylene glycol (PEG), amorphous SeS2in Li-SeS2ASSB change into crystalline selenium and a small amount of sulfur. The continuous loss of sulfur from the active material may be related to the failure of the cell at 15 cycles and the severe instability of the Coulombic efficiency. It was found that the PEG coating selenium disulfide graphene composite (PEG@rGO-SeS2) cathode maintained a specific capacity of 258 mAh g−1and a stable Coulombic efficiency of about 97% after 50 cycles. TEM analysis shows that the charging product remains as a granular amorphous selenium disulfide with a constant Se/S ratio during cycling. The PEG-protected selenium disulfide can effectively limit the loss of elemental sulfur and regulate the reaction mechanism of the Li-SeS2batteries.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Ruiping Li,Ali Reza Kamali
Ferric oxide (Fe 2 O 3 ) is an attractive candidate for energy storage applications, including anode of Li-ion batteries due to its low-cost, high availability and large theoretical capacity. However, the mineral suffers from poor cyclability and rate performance due to the combination of rapid disintegration of the compound upon Li-ion insertion and extraction cycles, and poor conductivity of the electrode. Here, for the first time, we report on the clean modification of ferric oxide using corn-derived silica and graphite-derived graphene nanosheets , using a facile calcination-mechanical integration approach, without the involvement of environmentally-problematic raw materials. The product (Fe 2 O 3 @Fe 2 SiO 4 @G) consists of ferric oxide particles coated with iron silicate; and these hybrid particles are integrated with graphene nanosheets. The presence of Fe 2 SiO 4 layers could relieve the volume changes of Fe 2 O 3 involved in the cycling, and also improves the ionic conductivity reducing the interfacial resistance between the electrode and the electrolyte, while graphene nanosheets improves the electrical conductivity of the electrode. Thus Fe 2 O 3 @Fe 2 SiO 4 @G electrode considerably outperforms the initial Fe 2 O 3 with outstanding Li-ion storage capacities of 823 and 422 mA h g −1 recorded at the current densities of 100 and 1000 mA g −1 , respectively, after 300 cycles. Pseudocapacitive behavior of the electrode is found to be 76.6% at 1 mV s −1 , confirming the promotion of surface interactions in the nanostructured hybrid material . This article suggests a clean way of modifying naturally occurring Fe 2 O 3 to be used as the anode of lithium ion batteries.
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