CARBON
·
2015
·
IF 6.196
Feng Wu,Lili Shi,Daobin Mu,Hongliang Xu,Borong Wu
A novel hierarchical structure carbon/sulfur composite is presented based on carbon fiber matrices, which are synthesized by electrospinning. The fibers are constituted with hollow graphitized carbon spheres formed using catalytic Ni nano-particles as hard templates. Sulfur is loaded to the carbon substrates via thermal vaporization. The structure and composition of the hierarchical carbon fiber/S composite are characterized with X-ray diffraction, scanning electron microscopy, transmission electron microscopy , Raman spectroscopy , and nitrogen adsorption isotherms . The electrochemical performance is evaluated by cyclic voltammetry and galvanostatic charge–discharge. The results exhibit an initial discharge capacity of 845 mA h g −1 at 0.25 C (420 mA g −1 ), with a retention of 77% after 100 cycles. A discharge capacity of 533 mA h g −1 is still attainable when the rate is up to 1.0 C. The good cycling performance and rate capability are contributed to the uniform dispersion of sulfur, the conductive network of carbon fibers and hollow graphitized carbon spheres.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Changlong Lei,Jingyi Li,Zhouliang Tan,Yue Li,PeiPei He,Yuming Liu,Yunjiao Li,Feixiang Wu,Yi Cheng,Zhenjiang He
All-solid-state lithium metal batteries (ASSLMBs), as a candidate for advanced energy storage devices, invite an abundance of interest due to the merits of high specific energy density and eminent safety. Nevertheless, issues of overwhelming lithium dendrite growth and poor interfacial contact still limit the practical application of ASSLMBs. Herein, we designed and fabricated a double-layer composite solid electrolyte (CSE), namely, PVDF-LiTFSI-Li1.3Al0.3Ti1.7(PO4)3/PVDF-LiTFSI-h-BN (denoted as PLLB), for ASSLMBs. The reduction-tolerant PVDF-LiTFSI-h-BN (denoted as PLB) layer of the CSE tightly contacts with the Li metal anode to avoid the reduction of LATP by the electrode and participates in the formation of a stable SEI film using Li3N. Meanwhile, the oxidation-resistance and ion-conductive PVDF-LiTFSI- LATP (denoted as PLA) layer facing the cathode can reduce the interfacial impedance by facilitating ionic migration. With the synergistic effect of PLA and PLB, the Li/Li symmetric cells with sandwich-type electrolytes (PLB/PLA/PLB) can operate for 1500 h with ultralong cycling stability at 0.1 mA cm–2. Additionally, the LiFePO4/Li cell with PLLB maintains satisfactory capacity retention of 88.2% after 250 cycles. This novel double-layer electrolyte offers an effective approach to achieving fully commercialized ASSLMBs.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yuepeng Pang,Jing Wang,Zhiguo Zhou,Tao Yuan,Junhe Yang,Dalin Sun,Shiyou Zheng
Core-shell Fe 3 O 4 @Fe ultrafine nanoparticles (nano-Fe 3 O 4 @Fe, Fe 3 O 4 content 84 wt%) with a core (Fe) diameter of 5.1 ± 1.4 nm and a shell (Fe 3 O 4 ) diameter of 10.9 ± 1.6 nm is prepared by a liquid-phase pyrolysis and partial oxidation method. It is found that the core-shell Fe 3 O 4 @Fe ultrafine nanostructure can efficiently improve the electrochemical performance of Fe 3 O 4 as anode material for Li-ion batteries in terms of rate capability and cycle life. For instance, specific capacities of 884 and 705 mAh/g can be obtained for the nano-Fe 3 O 4 @Fe electrode after 100 cycles at 200 mA/g and 500 cycles at 1000 mA/g, respectively. It is believed that these improvements can be attributed to the significant shortened transfer distance of electrons and Li-ions with relatively low specific surface area, ultrahigh electronic conductivity inside the nanoparticles and good ductility to accommodate the asymmetric volume change.
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高影响因子
Functional Materials Letters
·
2021
·
IF 2.17
Weiren Hu,Sen Wang,Long Peng,Xianluo Hu
Energy density, rate capability, and safety are often compromised in lithium-ion batteries (LIBs). To overcome this dilemma, novel electrode structure design is considered as one of the most promising routes. However, simple and scalable fabrication methods are currently very limited. Here, an electrostatic self-assembled three-dimensional Li 4 Ti 5 O 1 2 (3D-LTO) electrode with high-energy density as a whole and excellent thermal stability was fabricated by regulating the zeta potential of electrode components. Such a 3D electrode features an intergraded current collector layer of SiO 2 /ketjen black (KB) and active material layer of SiO 2 /KB/LTO/carbon fiber (CF). Benefiting from its well-designed electronic conductive 3D skeleton and desirable chemical affinity with the liquid electrolyte, outstanding cyclability (capacity retention of 85% over 80 cycles) and rate capability (125 mAh g − 1 at 5 C) could be achieved for Li/3D-LTO cells with a high LTO mass loading of 10 mg cm − 2 . Excellent thermal-tolerance of the 3D electrode enables the cell with good operability and safety at an elevated temperature of 80 ∘ C. The discharge capacity of the Li/3D-LTO half-cell remains 160 mAh g − 1 at 1 C after 100 cycles. This simple and scalable method for the fabrication of the 3D electrodes boosts the energy density, rate capability, and high-temperature operability, which is promising for next-generation LIBs.
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高影响因子
Materials
·
2017
·Vol. 10
·期 5
·535
·
IF 2.654
Min Yin,Fang Yang,Zhaojie Wang,Miao Zhu,Ming Liu,Xiuru Xu,Zhenyu Li
One-dimensional SnO2- and Li+-doped SnO2porous nanofibers were easily fabricated via electrospinning and a subsequent calcination procedure for ultrafast humidity sensing. Different Li dopant concentrations were introduced to investigate the dopant’s role in sensing performance. The response properties were studied under different relative humidity levels by both statistic and dynamic tests. The best response was obtained with respect to the optimal doping of Li+into SnO2porous nanofibers with a maximum 15 times higher response than that of pristine SnO2porous nanofibers, at a relative humidity level of 85%. Most importantly, the ultrafast response and recovery time within 1 s was also obtained with the 1.0 wt % doping of Li+into SnO2porous nanofibers at 5 V and at room temperature, benefiting from the co-contributions of Li-doping and the one-dimensional porous structure. This work provides an effective method of developing ultrafast sensors for practical applications—especially fast breathing sensors.Keywords:humidity sensor;electrospun porous nanofibers;lithium doping;response-recovery behavior
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高影响因子
Materials Research Express
·
2016
·Vol. 3
·期 4
·045010
·
IF 0.968
Ting Fan,Jiantao Lü,Futian Lin,Zifan Zhou
Improved red emission in polyvinylpyrrolidone (PVP)-coated hollow LaF3:Eu3+ nanoparticles by introducing Li+ ions was found for the first time via a one-step template-free hydrothermal method. The hollow formation can be attributed to self-recrystallization and a local Ostwald ripening thermodynamic process. Pores were clearly seen and widely distributed in all LaF3 nanoparticles. The introduction of Li+ ions did not introduce new crystalline phases and resulted in little change in size and morphology of the LaF3 nanoparticles. The main diffraction peaks were found to shift slightly with the Li+ doping concentrations, which indicates that Li+ changes the crystal field environment of Eu3+. The excitation and red emission intensity both doubled when codoped with 7 mol% Li+ ions. The widely distributed pores and improved luminescence properties of our nanoparticles facilitated the construction of new nanocomposites for novel biological applications.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 14
·19480-19492
·
IF 4.672
Jiuqing Liu,Fanli Zeng,Meng Liu,Junying He,Qihou Li,Feifei Song,Zikun Hong,Ya Chen,Lishun Bai,Chen Cheng,Zehao Chen
Summary As one of the most promising energy storage systems, the application of lithium sulfur battery is hindered by low ionic conductivity, poor thermal stability, and a serious shuttle effect of polysulfide species of commercial polyolefin separators. Herein, a kind of novel porous polyetherimide (PEI) based separator (IAPEI-4) with excellent heat resistance and electrochemical properties was prepared. Briefly, by grafting amino group (–NH 2 ) onto the surface of SiO 2 , highly dispersed amino-functionalized SiO 2 (A-SiO 2 ) were synthesized as fillers to blend PEI matrix. Based on physical characterizations of the representative IAPEI-4 separator, abundant micropores and mesopores exist in the separator, and A-SiO 2 nanoparticles are uniformly distributed in the PEI matrix. The ameliorated Li + transport channels and the uniform distribution of A-SiO 2 nanoparticles endow IAPEI-4 separator with higher ionic conductivity (1.60 mS cm −1 ) and Li + transfer number (0.63). Besides, the IAPEI-4 separator exhibits good electrochemical stability and excellent thermal stability (no shrinkage at 200°C). The Li-S cells with the IAPEI separator also show greatly enhanced electrochemical performances. After 100 cycles, its specific discharge capacity can reach 695.4 mAh g −1 at 0.2 C and its capacity retention rate is 84.8%. This simple and effective separator modification method can provide a general strategy to achieve high-performance Li-S batteries.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Bo Wang,Wei Guo,Yongzhu Fu
Lithium–sulfur (Li–S) batteries are promising to enable high-energy-density storage systems; however, their commercialization is hampered by several technical challenges such as polysulfide shuttle and safety issues related to the lithium metal anode. Herein, we use anodized aluminum oxide (AAO) membranes as separators in Li–S batteries for the first time. AAO membranes are rigid and nonflammable, which is helpful for improving battery safety. The aligned and uniform channels within AAO membranes provide fast pathways for lithium ion transport, leading to low areal specific resistance due to the electroosmotic flow of lithium ions in nanoscaled channels. In addition, the AAO separator leads to low overpotential during lithium deposition/stripping in lithium symmetric cells. The Li–S cells with AAO separators show better cycling performance than those with Celgard ones, in particular, at high C rates. At the 2 C rate, the cell shows a battery performance of 480 cycles with a capacity degradation rate of 0.105%, which is much better than that when the Celgard separator is used. This work demonstrates that AAO membranes are promising separators with unique properties for improving the performance of Li–S batteries.
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高影响因子
IONICS
·
2021
·Vol. 27
·期 10
·4127-4134
·
IF 2.817
Guan Dichang,Huang Yong,He Meimei,Hu Guorong,Peng Zhongdong,Cao Yanbing,Du Ke
All-solid-state Li-ion batteries (ASSLBs) are promising systems to power electronic devices and electric vehicles for their high-energy density and safety. PEO-based composite electrolytes containing lithium salts and various fillers have been regarded as the most attractive solid electrolytes for ASSLBs due to their high interfacial compatibility with electrodes, high mechanical flexibility, and easy fabrication. For PEO/lithium salt/ceramic composite electrolytes, both “ceramic-in-polymer” and “polymer in ceramic” can be applied to solid-state batteries. “Ceramic-in-polymer” can provide high ionic conductivity but narrow electrochemical window; “polymer in ceramic” can provide wide electrochemical window but low ionic conductivity. In order to combine the high conductivity of “ceramic in polymer” with the wide electrochemical window of “polymer in ceramic,” we designed multilayer PEO/ Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) composite electrolytes with low content of LLZTO (10wt %) in the inside layer and high content of LLZTO (40wt %) in the surface layer (PCEs-40–10-40) by a simple solution casting method. The PCEs-40–10-40 showed high ionic conductivity(4.61 × 10 –4 \({\mathrm{S}\cdot \mathrm{cm}}^{-1}\) ) and a wide electrochemical window(> 5.1 V) at 60 ℃. Compared with monolayer composite electrolytes, solid-state LiFePO 4 |Li batteries with multilayer composite electrolytes showed much better cycling stability (capacity retention of 98.8% after 200 cycles) at 0.5C and 60 ℃. This work shall give practical insights for the applications of PEO-based composite electrolytes.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Qiuyan Bi,Shiai Xu
A positively charged PI/PDA/PEI nanofiltration membrane was prepared in this study by crosslinking between polyethyleneimine (PEI) and poly(dopamine) (PDA) on the polyimide (PI) support membrane for separating Mg 2+ and Li + from MgCl 2 /LiCl mixed solution, and its chemical structure, surface properties, and separation performance were investigated. The results indicate that the PI/PDA/PEI membrane has a thin positively charged layer and shows excellent rejections against many inorganic salts [MgCl 2 (93.1%) > MgSO 4 (86.5%) > Na 2 SO 4 (74.7%) > LiCl (37.6%)]. More importantly, the membrane exhibits long-term stability and good separation of Mg 2+ and Li + , and the Mg/Li ratio of the permeate of brine obtained from West Taijnar salt lake can be reduced from 65.3 to 5.0 at pH 6.5 by filtration.
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DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Qian Wu,Yun Yang,Zheng Chen,Qinting Su,Songde Huang,Dakun Song,Caizhen Zhu,Rui Ma,Cuihua Li
Gel electrolytes have attracted great attention due to the high ionic conductivity and superior mechanical strength. However, poor interfacial stability between Li metal and gel electrolytes hinders their practical application. Here, a double polymer network gel electrolyte (DPNGE) is prepared via photopolymerizing branched acrylate on the poly(vinylidene fluoride-co-hexafluoropropylene) matrix to solve this issue. This DPNGE possesses an enhanced ionic conductivity of 9.5 × 10–4 S cm–1 at room temperature and a wide electrochemical stability window up to 5.0 V. The assembled Li/DPNGE/LiFePO4 batteries demonstrated a 153.7 mA h g–1 initial discharge capacity at 0.5 C and keep 92.7% capacity retention after more than 500 cycles. Moreover, a systematic analysis confirms that we construct a stable solid electrolyte interphase layer for homogeneous deposition and a stable cycle. These advantages enable the prepared DPNGE to show great application potential in high-performance lithium metal batteries.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2025
·Vol. 19
·期 5
·1-11
·
IF 4.5
Li Guojie,Liang Xuan,Zhang Junlong,Guo Bin,Mao Baoguang,Sun Hongming,Wang Aoxuan,Deng Qibo,Liu Chuntai
Lithium metal anode represents the ultimate solution for next-generation high-energy-density batteries but is plagued from commercialization by side reactions, substantial volume fluctuation, and the notorious growth of lithium dendrites. These hazardous issues are further aggravated under real-world conditions. In this study, a stable Al-Li/LiF artificial interphase with rapid ion transport pathways is created through a one-step chemical pretreatment process, effectively addressing these challenges simultaneously. As a consequence, the composite interfacial layer exhibits exceptional ionic conductivity, mechanical strength, and electrolyte wettability, ensuring swift Li + transfer diffusion while suppressing lithium dendrite growth. Remarkably, the Al-Li/LiF symmetric cell provides a cycle life exceeding 2300 h with a low polarization at 0.5 mA·cm −2 . Furthermore, its enhanced cycling stability and capacity retention as well as capacity utilization stability pairing with LiFePO 4 and LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathodes, highlighting the proposed approach as a promising solution for practical Li metal batteries.
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高影响因子
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