Frontiers in Chemistry
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2023
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IF 5.5
Gao Bingliang,Liu Zhiwei,Deng Yifan
Al-Li alloy was prepared by electrodeposition on solid aluminum electrode in a urea-LiCl (77.5:22.5, mol%) molten salt system at 353–393 K. The results of cyclic voltammetry and chronopotentiometry show that underpotential deposition of Li occurs on the Al electrode and forms phases of Al(α) and AlLi(δ) which are confirmed by XRD measurements. Scanning electron microscopy observation of deposits indicates that Al-Li alloy with the thickness of 143 µm was obtained by potentiostatic electrolysis at −0.5 V vs. Li+/Li. The Li content in the alloy obtained at 373 K can reach 6.9 wt%. Galvanostatic electrolysis at 20 A demonstrated that Al-Li alloy coating on aluminum plate can be obtained from urea-LiCl electrolyte at 373 K in the atmosphere.
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高影响因子
JOURNAL OF POWER SOURCES
·
2023
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IF 9.2
Hongjiao Wang,Wenzhi Li,Lilin Wu,Bai Xue,Fang Wang,Zhongkuan Luo,Xianghua Zhang,Ping Fan,Laurent Calvez,Bo Fan
The solid/liquid Li-S battery shows promise in solving both the polysulfide “shuttle effect” in liquid batteries and the interfacial contact in all-solid-state batteries. However, increasing the interfacial stability of the electrolyte and the solid electrolyte remains a challenge in the solid/liquid batteries. In this work, a high ionic conductivity Li 3 PS 4 solution is synthesized using a nano-Li 2 S precursor, which is then utilized to form a solid electrolyte Li 3 PS 4 @Li 7 P 3 S 11 via dip-coating. The Li 3 PS 4 @Li 7 P 3 S 11 can form a dense protective interface Li 3 PS 4 -DME with the DOL/DME and DME electrolyte. This interface can prevent direct contact between the solid electrolyte and the electrolytes, efficiently inhibiting further solid electrolyte decomposition. The lithium symmetric battery with the solid electrolyte Li 3 PS 4 @Li 7 P 3 S 11 is cycled stably for 1000 h, at a current density of 0.38 mA cm −2 and a capacity of 1.51 mA h cm −2 . The Li-S battery with the solid electrolyte Li 3 PS 4 @Li 7 P 3 S 11 can cycle stably for 300 cycles at 0.2C with a capacity of 600 mA h g −1 remaining.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Haoyu Zhang,Baoguo Zhang,Bing Ai,Kefeng Pan,Weimin Zhang,Lipeng Zhang,Zhongning Shi
The high chemical activity of metallic Li hinders its efficient electrochemical extraction at low temperatures, necessitating the use of energy- and cost-intensive methods such as vacuum thermal reduction or electrodeposition from ionic-liquid and molten-salt electrolytes. Herein, we report the direct room-temperature electrowinning of metallic Li from a simple low-cost electrolyte, namely a solution of LiCl in dimethylacetamide (DMAc), determine the optimal concentration of LiCl, and examine the redox processes in the optimized system. Potentiostatic deposition on high-purity Al is shown to induce solid-state cathode alloying and thus produce a uniform, flat, and dense coating of a LiAl master alloy comprising spherical clusters formed by LiAl alloy nanosheets. Finally, the direct smelting of electrodeposited films is proposed as a method of rapidly realizing the “thin film” to “bulk” transformation of electrodeposited materials to stabilize metallic Li and form bulk Li-based alloys. Thus, this study provides a basis for the continuous, low-cost, sustainable, and fast electrochemical production of bulk active metals or their alloys.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Kaixin Zhao,Lirong Zhang,Qi Jin,Junpeng Xiao,Lili Wu,Xitian Zhang
Lithium (Li) metal has been recognized as the most promising anode material for next-generation rechargeable batteries. However, the practical application of Li anodes is hampered by the growth of Li dendrites. To address this issue, a robust and uniform Sb-based hybrid lithiophilic protective layer is designed and built by a facile in situ surface reaction approach. As evidenced theoretically and experimentally, the as-prepared hybrid protective layer provides outstanding wettability and fast charge-transfer kinetics. Moreover, the lithiophilic Sb embedded in the protective layer provides a rich site for Li nucleation, which effectively reduces the overpotential and induces uniform Li deposition. Consequently, the symmetric cell exhibits a long lifespan of over 1600 h at 1 mA cm–2 and 1 mAh cm–2 with a low voltage polarization. Furthermore, excellent cycling stability is also obtained in Li–S full cells (60% capacity retention in 800 cycles at 1 C) and Li||LFP full cells (74% capacity retention in 500 cycles at 5 C). This work proposed a facile but efficient strategy to stabilize the Li metal anode.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 4
·2444-2455
·
IF 11.9
Zi-Fang Chen,Xingguang Chen,Chengwei Chen,Xiaoxu Lai,Jian Qin,Chi Chen,Dan Sun
Stretchable current collectors are essential components of deformable energy-storage devices. Deposition of a conductive layer on an elastomer surface is a common fabrication strategy for stretchable current collectors, however, facing the challenges of reducing the tensile resistance and film thickness. In this study, by integrating Ti3C2Tx nanosheets with MWCNTs, the authors deposited a staggered conductive network on the surface of an elastic styrene–ethylene–butylene–styrene (SEBS) film and thus created a stretchable hybrid conductor (TMS). The TMS current collector exhibits a low sheet resistance of about 31.3 Ω □−1 and shows relatively minor changes under stretching states. The current collector with a thickness of 144 μm possesses a strain ability of 100% and can recover to the original state when the stress is withdrawn. Besides, the TMS-based coin cell using V2O5 and LiMn2O4 as active materials achieves a reversible capacity of 85.5 mA h g−1 and delivers a high capacity retention of 95.4% (5C, 900 cycles), comparable to performance with the traditional rigid Ti current collectors (97.1%). Furthermore, the assembled coplanar batteries with a thickness of 366 μm can work under bending and stretching states with stable electrochemical performance. Moreover, the power supply tests under various working states demonstrated the ability of the stretchable LIBs to deliver stable power to a red LED, which shows a promising approach for developing thin and deformable energy-storage systems.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xiaohan Li,Ke Xu,Yingjie Yu,Chi Chen,Haijun Zhang,Wen Lei
Silicon (Si) is a highly promising anode candidate for lithium-ion batteries. However, the huge volume change of Si during the lithiation/delithiation process might cause serious structural damage, thereby restricting its potential application. Herein, a novel self-standing electrode consisting of porous carbon coated Si (Si@p-C) nanoparticles and carbon fibers (Si@p-C/p-CF) is prepared by a facile electrospinning technique. The three-dimensional carbon fiber framework derived from polyacrylonitrile serves as the support for self-standing electrode, which exhibits superior flexibility and satisfactory electrolyte penetration ability. The porous carbon matrix on the surface of Si nanoparticles can effectively buffer the volume expansion of Si during cycling and prevent direct contact between Si and the electrolyte. Attributed to these merits, the obtained (Si@p-C) 0.5 /p-CF electrode exhibits outstanding cycling stability with a specific capacity of 940 mAh g −1 at 0.2 A g −1 after 400 cycles, delivering great application potential.
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Small
·
2023
·
IF 13.3
Ling Lv,Haikuo Zhang,Jinze Wang,Di Lu,Shuoqing Zhang,Ruhong Li,Tao Deng,Lixin Chen,Xiulin Fan
The utilization of layered oxides as cathode materials has significantly contributed to the advancement of the lithium-ion batteries (LIBs) with high energy density and reliability. However, the structural and interfacial instability triggered by side reactions when charged to high voltage has plagued their practical applications. Here, this work reports a novel multifunctional additive, id est , 7-Anilino-3-diethylamino-6-methyl fluoran (ADMF), which exhibits unique characteristics such as preferential adsorption, oxygen scavenging, and electropolymerization protection for high-voltage cathodes. The ADMF demonstrates the capability to ameliorate the growth of cathode-electrolyte interphase (CEI), effectively diminishing the dissolution of transition metal (TM) ions, reducing the interface impedance, and facilitating the Li + transport. As a result, ADMF additive with side reaction-blocking ability significantly enhances the cycling stability of MCMB||NCM811 full-cells at 4.4 V and MCMB||LCO full-cells at 4.55 V, as evidenced by the 80% retention over 600 cycles and 87% retention after 750 cycles, respectively. These findings highlight the potential of the additive design strategy to modulate the CEI chemistry, representing a new paradigm with profound implications for the development of next-generation high-voltage LIBs.
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Journal of Materiomics
·
2023
·
IF 9.4
Jian Guo,Xinrui Yang,Yulong Yang,Shuting Pang,Shan-Tao Zhang,Bin Yang
Ferroelectric Sr 0.6 Ba 0.4 Nb 2 O 6 (SBN) shows typical unfilled tetragonal tungsten bronze structure where 1/6 A sites and all C sites are unoccupied. The presence of such structural vacancy provides the possibility to further modulate the crystal structure and electrical properties. In this work, alkali ions (Li + , Na + , K + ) doped SBN ceramics have been fabricated via solid-solution reaction method. In general, each doping promotes the crystal structure evolves from unfilled toward filled tungsten bronze. However, the different doping ion radius causes the differences in occupying initial structural vacancies, resulting in significantly different electrical properties, Li + doping enhances relaxor characteristic whereas Na + and K + doping lead to normal ferroelectric behavior, accompanying an increase in Curie temperature ( T c ) from 36 °C of SBN to 40, 212, 148 °C of Li + , Na + and K + doping, respectively. Benefiting from improved relaxor degree and high density, the Li + doped SBN displays a good energy storage performance. Since the ratio of Sr/Ba and (Sr + Ba)/Nb has not been changed, this work presents direct evidence for the effect of structural vacancy on crystal structure and properties, as well as inspiration for further work on unfilled tungsten bronze.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Fangfang Zou,Xue Xia,Xiaojia Zheng,Xu Su,Wei Guan,Xueqiang Qi,Meng Wang,Lian Wang,Xuebu Hu
The application of Li metal anode in high energy density batteries is hindered by uncontrolled dendrites growth and rapid capacity decline. In this study, 4-aminobenzoic acid (4-ABA) is used as a multifunctional electrolyte additive to effectively stabilise Li anode and extend the cycling life of LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) cathode in carbonate electrolyte. It is found that 4-ABA facilitates the desolvation of Li + and increases the Li + transference number, leading to an increase in Li + flux on the surface of the Li anode, and finally the growth of Li dendrites is inhibited. The cycling performance of Li||Li symmetric cell is extended from < 400 h to more than 600 h at 1 mA cm −2 with a capacity of 1 mAh cm −2 . For the NCA cathode, 4-ABA is involved in the formation of a thin and uniform cathode electrolyte interphase (CEI) layer, which is conducive to inhibiting the corrosion of electrolyte on NCA cathode and reducing the dissolution of the transition metals Ni and Co. Thus, the electrochemical performances of the Li||NCA cell with the electrolyte containing 0.5% 4-ABA are significantly improved. In particular, the discharge capacity of the cells with the electrolyte containing 0.5% 4-ABA are still 164.9 and 150.7 mAh g −1 compared to only 126.3 and 116.0 mAh/g for the cells with the baseline electrolyte after 200 cycles at 1C and 5C. This study provides a simple and effective strategy for improving the electrochemical performances of Li anodes and NCA cathodes by optimising the electrolyte.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Hui Yang,Shuang Shao,Baozhong Ma,Yingwei Lv,Yongqiang Chen,Chengyan Wang
With the increasingly essential role of Li in new energy industry, Li extraction from ore has attracted active attention. In the prior study, a process combined thermal activation and alkali leaching was proposed to extract Li from Li concentrate. Previous research found that Li was precipitated as Li 2 SiO 3 and entered into the leach residue at the leaching temperature exceeded 100 °C. Drawing inspiration from this phenomenon, hydrothermal precipitation of Li as intermediate product Li 2 SiO 3 from the alkali leach liquor of Li concentrate was proposed. Firstly, the E–pH diagrams of Li–Si–H 2 O system were plotted to analyze the feasibility of hydrothermal precipitation Li. And the corresponding operation window was established. Subsequently, the effect of factors including Li/Si ratio, hydrothermal temperature and time, Li and NaOH concentrations on the migration behaviors of Li and Si were explored using the simulated leach liquor. The experimental results were in good consistence with the thermodynamic analysis. Ultimately, the leach liquor was used to precipitate Li at the determined optimal conditions, and the Li precipitation efficiency reached 91.0%. This study provided an innovative strategy for separating Li from the alkali leach liquor of Li concentrate without adding any reagents. An economical and sustainable route for synergistic extraction of Li, Rb, and Cs from Li concentrate was also proposed.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Donghong Duan,Kaixin Chen,Chongzhi Xing,Xiaoqiang Wang,Xianxian Zhou,Shibin Liu
The development of lithium-sulfur (Li-S) batteries necessitates the creation of efficient cathode materials . By simultaneous phosphating and sulfurating, a spindle-shaped CoP-Co 3 S 4 heterostructure sulfur cathode substrate made up of numerous tiny needle-like structures is created. The benefits of CoP with outstanding conductivity and Co 3 S 4 with great adsorption capacity are combined in the as-prepared CoP-Co 3 S 4 heterostructures, which achieve efficient capture-diffusion-transformation of polysulfides at the interface. The CoP accelerates the redox kinetics toward polysulfide conversion, and the Co 3 S 4 has a considerable adsorption power toward polysulfides. The quick nucleation of polysulfide and increased capture effectiveness are aided by the quick transfer of polysulfide from the Co 3 S 4 surface to the CoP surface. As a result, the CoP-Co 3 S 4 @S cathode battery with a 1.1 mg cm −2 sulfur load achieves a high initial capacity of 1516.9 mAh g −1 at 0.2 C and maintains that capacity after 100 cycles at 750.1 mAh g −1 . After 300 cycles, even the 565.1 mAh g −1 specific capacity can be attained at 1 C.
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Energy Storage Materials
·
2022
·
IF 20.831
Yan Liu,Yuan Li,Long Chen,Fang Yan,Zhihong Lin,Junmou Wang,Jingyi Qiu,Gaoping Cao,Biyan Wang,Hao Zhang
For high-specific energy Li batteries, hybrid anodes with graphite and Li metal are promising. However, the degradation of graphite-Li metal hybrid anodes during long cycles has been significantly fastened by dendritic Li growth and dead Li accumulation ascribed to the inferior solid electrolyte interphase (SEI). Efficient material construction strategies are highly demanded to inhibit the deactivation of graphite intercalation compounds (GICs: LiC 12 , LiC 6 , etc.) in graphite-Li metal hybrid anodes. Here, we introduced a physical-chemical modification strategy. Which is acted by a combination of a LiF-rich and elastic SEI and preset void in the composite electrodes, which was realized by Cu mesh current collectors, resulting in the retardant of the accumulation of dead Li and side reaction sediments on graphite surface and the retaining of the Li + insertion channels. The strategy ensured the long-term activity of both GICs and Li metal in graphite-Li metal hybrid anodes. Thus, the hybrid anodes obtain higher reversibility of both the lithium-ion insertion/deintercalation and Li metal deposition/dissolution processes. The batteries can maintain a specific capacity of up to 500 mAh/g, with an average CE of 98.5% for 85 cycles. This work presents a novel and effective methodology to realize the high reversibility of the high-capacity graphite-Li metal hybrid anodes.
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