Journal of Energy Storage
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2023
·
IF 9.4
Fusheng Yin,Zhijun Zhang,Yuling Fang,Chunwen Sun
NASICON structured Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) has attracted widespread attention due to its simple preparation and excellent stability towards water and air. However, there are many problems such as high interfacial resistance between electrolyte and electrodes as well as low ionic conductivity of LATP. In this paper, the effect of F doping on Li ion diffusion channel in electrolyte was investigated in detail by density functional theory (DFT) calculation. The results show that F doping can effectively reduce the formation energy of Li vacancy. Meanwhile, it can also reduce the diffusion energy barrier and induce the high-energy Li ions at 36f site to carry out synergistic diffusion via various ways at the same time. Then, the F-doped LATP electrolyte was prepared successfully. Its ionic conductivity is as high as 0.358 mS cm −1 at room temperature . At the same time, the solid-state lithium metal batteries with F-doped LATP electrolyte shows a high capacity of 136.2 mA h g −1 at 0.5C and excellent cyclability for 200 cycles. These results demonstrate that F doping may be an effective way to improve the performance of LATP electrolyte.
研究领域:
材料科学
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电化学
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储能技术
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固态电池
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计算材料科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Xiaohong Zou,Qian Lu,Cuie Wang,Sixuan She,Kaiming Liao,Ran Ran,Wei Zhou,Liang An,Zongping Shao
Before the practical application of the Li–O 2 battery (LOB), a critical issue regarding large overpotential upon charging (which causes irreversible side reactions and low energy efficiency) should be resolved. The utilization of redox mediators (RMs) which oxidatively decompose insulating discharge product, Li 2 O 2 , is one promising solution to address this issue. However, the soluble RMs can easily diffuse to and react with the Li metal anode (encountering Li dendrites is even worse). Here, a chemical self-assembly strategy is introduced into the fabrication of the iodide-redox-phobic and Li-ion-philic membrane for LOBs, in which the electronegative δ-MnO 2 layer is in-situ grown on commercial polyethylene (PE) membrane (MnO 2 @PE). The electronegative MnO 2 layer can simultaneously repel the shuttle of iodide species and regulate the uniform Li + deposition. Controlling cut-off capacity of 1000 mAh g −1 , iodide-redox-based LOB with MnO 2 @PE demonstrates low overpotentials (∼0.7 V vs. Li + /Li), dendrite-suppressing capability, as well as impressive long-term reversibility over 500 cycles (2000 h), which urges the LOB technology competitive among the next-generation rechargeable power systems.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Mingxiu Hou,Jianshun Feng,Fanghui Wang,Weiyu Wang,Zhenjiang Li,Jie Liu,Fengli Yu,Lei Wang
Lithium–sulfur (Li–S) batteries have been limited by their poor electrochemical performance due to the large volume change and severe shuttle effect during cycling. Binders serve as an essential role in sulfur electrodes and can stabilize the mechanical integrity of the electrode. It also has been demonstrated that designing strong-affinity binders is a feasible and facile method to suppress the shuttle effect. Therefore, in this work a strong-affinity elastic network binder is designed for high-performance Li–S battery coupling with tannic acid (TA) and polyurethane (PU). Firstly, the rich hydrogen bonds between TA and PU result in a mechanically robust network to keep the sulfur electrode from cracking in the cycling process. Secondly, the selected TA with abundant phenolic hydroxyl groups possesses strong adsorption capability toward polysulfides, which can efficiently restrain the shuttle effect. Hence, the cycling stability of Li–S batteries using P1T1 binder is significantly improved, maintaining the capacity of 602.5 mAh g–1 after 500 cycles at the current density of 0.5 C.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yanghe Liu,Quan Li,Shenghuan Wang,Mengzhu Liang,Yanhong Ji,Zhenyu Cui,Mohammad Younas,Jianxin Li,Benqiao He
High-performance nanofiltration (NF) membrane plays a key role in Li + /Mg 2+ separation process. In this work, a new NF membrane with positively and negatively charged groups was prepared by grafting p-aminosalicylic acid (AS) onto the surface of polyamide (PA) membrane followed by chelation with Fe 3+ ions for Li + /Mg 2+ separation. The AS grafting (PA-g-AS) and Fe 3+ chelating (PA-g-AS-Fe) NF membranes had almost same surface and section structure and surface pore size as the PA membrane. But Zeta potential (about −8 mV at pH 7) of the obtained PA-g-AS-Fe membrane was improved in comparison with the PA and PA-g-AS NF (about −20 mV at pH 7) membranes due to Fe 3+ addition, suggesting that there were positively and negatively charged groups on the membrane surface. The PA-g-AS-Fe membrane showed a high Mg 2+ rejection of 97.7% and high Li + permeation (negative rejection of −87.6%); while a high Li + /Mg 2+ separation factor (S Li , Mg ) of about 81.5 was achieved, which is much higher than those for PA and PA-g-AS NF membranes and surpassed those of the results reported in literature. The fluxes of three membranes were about the same. The results demonstrated the NF membrane with positively and negatively charged groups was suitable for efficient separation of Li + /Mg 2+ and would have promising applications in recovery of lithium from brine.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Haoxiang Zhong,Lingzhi Zhang
The low sulfur utilization and the serious shuttle effect of polysulfides severely hamper practical application of Li-S batteries. Herein, sulfur cathodes with the multi-functional structures, featured with double-layered hollow carbon sphere with up to 50 nm interlayer space (DLHC-50) in situ grown Co-SnS catalytic layer is designed and synthesized for lithium sulfur batteries. Co-SnS/DLHC-50 can encapsulate 72% sulfur, higher than 63% for Co-SnS/DLHC-20 due to the large interlayer spaces of DLHC-50. Meanwhile, polysulfides are also effectively restricted via physical entrapment from DLHC-50 as well as chemical binding between Co-SnS and polysulfides. Benefiting from the well-constructed host framework, Co-SnS/DLHC-50 @S shows higher specific capacity/capacity retention of 760.4 mA h g −1 /72.9% after 500 cycles at 0.5 C, than that of 546.5 mA h g −1 /62.2% and 668.9 mA h g −1 /62.2%, for DLHC-50 @S, and Co-SnS/DLHC-20 @S, respectively. In addition, the strategy can be also extended to prepare other metal oxides (sulfides)/DLHC-50 for wide applications. Therefore, this work demonstrates a promising route to combat some bottlenecks such as low sulfur utilization, and the shuttle effect of polysulfides for Li-S batteries.
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高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
He Yang,Tingting Qin,Xinyan Zhou,Yu Feng,Zizhun Wang,Xin Ge,Nailin Yue,Dabing Li,Wei Zhang,Weitao Zheng
Large anions exhibit slow diffusion kinetics in graphite cathode of dual-ion batteries (DIBs); particularly at high current density, it suffers severely from the largely-reduced interlayer utilization of graphite cathode, which as a bottleneck limits the fast charge application of DIBs. To maximize interlayer utilization and achieve faster anion diffusion kinetics, a fast and uncrowded anion transport channel must be established. Herein, Li + was pre-intercalated into the graphite paper (GP) cathode to increase the interlayer spacing, and then hosted for the P F 6 - anion storage. Combined with theoretical calculation, it shows that the local interlayer spacing enlargement and the residual Li + reduce the anion intercalation energy and diffusion barrier, leading to better rate stability. The obtained GP with Li + pre-intercalation (GP-Li) electrode exhibits a discharge capacity of 23.1 mAh g −1 at a high current of 1300 mA g −1 . This work provides a facile method to efficiently improve the interlayer utilization of graphite cathode at large currents.
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高影响因子
ELECTROCHIMICA ACTA
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2022
·
IF 7.336
Jie Li,Youcai Lu,Shiyu Ma,Zhongjun Li,Qingchao Liu
Li–O 2 battery has attracted wide attention because it can satisfy the need for a new energy storage system with high energy density. However, poor oxygen reduction (ORR)/oxygen evolution (OER) kinetics involving Li 2 O 2 formation/decomposition is a major obstacle to its development. By designing suitable cathode with desired structure and surface electronic states, the formation/morphology of Li 2 O 2 and the reaction kinetics of charge process can be efficiently optimized simultaneously. In this work, a novel sulfur (S) and chlorine (Cl) co-doped porous carbon (CSC) were synthesized by one-step pyrolysis strategy, and the amount of heterogeneous atoms could be flexibly controlled by different calcination temperatures . Experimental combined with theoretical calculations show that the content of C Cl bond plays an important role in the adsorption of intermediate LiO 2 , thus regulating the morphology of Li 2 O 2 and ultimately affecting the release of battery energy. The C S bond mainly acts on the dynamics of the ORR and OER processes, which has an important influence on improving the round-trip efficiency of the battery. Benefiting from the synergistic effect of heteroatoms , the electrochemical performances of the Li–O 2 battery, including round-trip efficiency, discharge capacity and cycling stability are greatly improved.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 19
·4520-4527
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IF 6.813
Jian Hao,Jun Bai,Jing Wang,Lu Xu,Junli Guo,Caixia Chi,Haihong Li
The large volume changes of Ge-based electrode result in poor electrochemical cycling and rate performance and are the important factors hampering the practical implementation of Ge-based materials in Li-ion batteries (LIBs). Here we fabricated a fascicular structure Ge/Zn2GeO4 (Ge/Zn2GeO4NFs) by an in situ growth of flower-like Zn2GeO4 on micron-sized Ge. In an EDTA/water solvent system, Zn2GeO4 were generated on the Ge substrate, and self-assembled into a flower-like structure through coordination and H-bonding. Benefiting from the improved structural stability and abundant transmission channels of lithium ions and electrons, the as-fabricated Ge/Zn2GeO4NFs anodes exhibited excellent cyclability and rate performance. At a current density of 0.2 A g−1, Ge/Zn2GeO4NFs delivered a high capacity of 1621 mA h g−1 with an initial coulombic efficiency of 62%, and even after the 200th cycle a capacity of 816 mA h g−1 could be maintained. Further, the Ge/Zn2GeO4NFs anode delivered excellent rate capabilities of 567 and 388 mA h g−1 at high current densities of 2 and 5 A g−1, which were superior to the micron-sized Ge electrode (133 mA h g−1 at 5 A g−1). The results show that the Zn2GeO4 nanoflower, which adheres on the micron Ge substrate inseparably, could buffer the volume change of Ge, enlarge the electrolyte contact area, provide continuous lithium-ion and electron pathways, and thus improve the lithium-storage performance of the micron-sized Ge electrodes. This synthesis strategy provides new ideas for the development of micron-sized anode materials for LIBs.
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高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Maoshuai Sun,Ji Li,Haocheng Yuan,Xiaoyue Zeng,Jinle Lan,Yunhua Yu,Xiaoping Yang
Lithium metal batteries with quasi-solid-state electrolytes are promising in the advanced energy storage system due to the high theoretical capacity and safety. Herein, a unique quasi-solid-state electrolyte (PUIE) containing 3D ion transport pathways based on UIO-66 has been constructed by a flexible process: electrospinning combined electrostatic spraying, followed by impregnation and roll press. In particular, UIO-66 with abundant Lewis acidic sites and channels enhances the ion transport and the restriction to anion in the electrolyte. The rationally designed PUIE-3 exhibits a high ionic conductivity of 1.08 mS/cm at 25 °C, a wide electrochemical window of 5.5 V, and a high Li + transference number of 0.52. On the basis of the regulating effect of UIO-66, the growth of Li dendrites is significantly restrained and the electrolyte exhibits long-life electrochemical stability with Li anode during the Li plating/stripping. In consequence, lithium metal batteries loaded with PUIE-3 exhibit remarkable cycling and rate performance. Our results indicate that rational design polymer nanofiber/metal-organic framework membranes offer a new avenue for developing high performance quasi-solid-state electrolytes.
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DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 37
·6518-6525
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IF 3.545
Qi-Ming Qiu,Guo-Yu Yang
Three new mixed-alkaline-metal borates, namely KNa8[Li@B12O18(OH)6](CO3)2 (1), Cs10[Li@B12O20(OH)2]2·6H2O (2) and Cs5[Li@B12O20(OH)2]·3H2O (3), have been synthesized under hydro/solvothermal conditions. Compound 1 is a borate carbonate with the isolated [Li@B12O18(OH)6]5− clusters and interesting layers formed by Na+ and CO32− ions, forming a 2D supramolecular structure with a 3,6-connecting binodal system. After changing the synthetic conditions, the isolated [Li@B12O18(OH)6]5− clusters are successfully extended to the layers in 2 and 3 by condensation reactions with the elimination of water molecules between oxoboron clusters. Each new fundamental building block [Li@B12O22(OH)2]9− in 2 and 3 connects with four neighboring units to form a 2D layer via B–O–B bonds for the first time, and 14-membered rings are also observed. Such a layer structure is first observed in dodecaborates. Since compound 3 crystallizes in the non-centrosymmetric space group, the second harmonic generation measurement and the dipole moments calculation have been carried out.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 36
·19996-20007
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IF 4.22
Zhang Chao,Yan Jun,Song Rui,Chen Lei,Liu Yong
Porous carbon nanofibers (PCNFs), are widely used as free-standing anode materials for lithium-ion batteries (LIBs), due to their high specific surface area and excellent ion diffusion kinetics, but they also present problems of reduced rate performance and cycling performance, due to poor strength caused by porosity. Herein, a novel surface porous carbon nanofiber (SPCNFs) is prepared by coaxial electrospinning, followed by carbonization. All the pores are distributed in the shell of the fibers, with a dense amorphous carbon structure in the core, which would not only provide abundant lithium-ion embedding sites, and accelerate the penetration of electrolyte ions, but also alleviate the reduction of mechanical properties (with a ~ 30% improvement to PCNFs). Consequently, our LIBs assembled with this SPCNFs anode represent remarkable cycling stability (445.33 mAh g −1 at 100 mA g −1 after 100 cycles and 388.92 mAh g −1 at 1 A g −1 after 1000 cycles), and excellent rate capacity (317.55 mAh g −1 at 1 A g −1 ).
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高影响因子
Nanoscale
·
2021
·Vol. 13
·期 24
·10849-10861
·
IF 7.79
Shunyou Hu,Yuanyuan Hu,Xiangli Liu,Jiaheng Zhang
Lithium–sulfur (Li–S) batteries generally suffer from a serious “shuttle effect” during the charging/discharging process, resulting in the loss of active components and sluggish redox reaction kinetics that hinder the cycle life and rate performance of the battery. To address this, CoSe/C hollow structures (CoSe/C HSs) were prepared via a simple hydrothermal strategy and used as a sulfur host for Li–S batteries. The battery with CoSe/C HSs exhibited a high initial specific discharge capacity of 1405 mA h g−1 with a coulombic efficiency of 99.8% at 0.1C. Additionally, S@CoSe/C HS cathodes with a high sulfur loading of 5.1 mg cm−2 delivered a considerable specific discharge capacity of 1256.1 mA h g−1 and maintained a high capacity of 1120 mA h g−1 after 100 cycles with a capacity decay rate of 0.11% per cycle at 0.1C. The unique raspberry-like structure of CoSe/C HSs prevents polysulfides from escaping the cathode host via both physical containment and the formation of Co–S and Se–Li chemical bonds, and it also enhances the polysulfide redox kinetics. Furthermore, the peculiar raspberry-like structure can withstand volume changes during charging/discharging to better protect the cathode.
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PubMed
高影响因子
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