ELECTROANALYSIS
·
2022
·Vol. 35
·期 4
·e202200306
·
IF 3.077
Zheng Zhou,Xin Pei,Tao Zhang,Liting Wang,Jianhe Hong,Yu Lu,Gang He
Gel polymer electrolytes (GPEs) incorporate both the high ionic conductivity of organic liquid electrolyte and the high safety performance of all-solid-state electrolytes (ASSEs), greatly improving the electrochemical performance of solid polymer electrolytes (SPEs). However, the practical application of GPEs is still limited by inferior interface compatibility, lithium dendrites, etc. Herein, we prepared GPEs based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) further co-blended the two-dimensional sheet inorganic filler hectorite and poly(methyl methacrylate) (PMMA) to improve the mechanical and electrochemical properties of the GPEs. When the content of PMMA and hectorite is optimal, this GPEs have an ionic conductivity of 1.06×10 −3 S cm −1 and outstanding lithium symmetric cells cycle time of more than 3000 h, indicating that the introduction of filler effectively inhibits the growth of lithium dendrites at room temperature. Moreover, the GPEs adopt a relatively simple solution casting method to provide a fresh idea for the synthesis of high-performance GPEs.
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Nanomaterials
·
2022
·Vol. 12
·期 18
·3215
·
IF 5.719
Jianzhong Yu,Song Ye,Xinling Xv,Ling Pan,Peixuan Lin,Huazhen Liao,Deping Wang
In this research, the LiY zeolite was firstly synthesized by using NaY as the parent zeolite; thereafter, the LiYAg and NaYAg zeolites created for formaldehyde gas detection were prepared with further Ag+-Li+/Na+exchange and a mild thermal treatment at 300 °C to promote the formation of luminescent Ag CLs. The spectra experimental results indicated that Ag CLs showed stronger and blue-shifted emissions in LiYAg compared with in NaYAg, and the emission intensity of Ag CLs in both zeolites monotonously decreased when exposed to increasing formaldehyde gas content. Moreover, the linear dependence of the Ag CLs’ emission intensity variation on formaldehyde content indicated a reliable method for fast and sensitive formaldehyde detection. According to the XPS, UV–vis absorption, and N2adsorption–desorption isotherm studies, the formaldehyde-gas-induced luminescence quenching of Ag CLs is due to the formation of Ag2O and Ag NPs, in which the higher content of Ag+/Ag0redox couples in LiYAg and larger surface area of NaYAg benefit the precise detection of formaldehyde gas in low- and high-content ranges, respectively. Furthermore, the blue-shifted peak position and widened FWHM of Ag CLs can also be used for the indication of formaldehyde gas and the detection limit of NaYAg and LiYAg, which both meet with the standards of the WHO and OSHA.Keywords:FAUY zeolite;silver clusters;luminescence property;formaldehyde detection;auger parameter
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guanhua Zhang,Xiaojing Li,Donghai Wei,Huihuang Yu,Jinghua Ye,Song Chen,Wen Zhang,Jian Zhu,Xidong Duan
As a representative two-dimensional layered material, In 2 Se 3 attracts an increasing research interest because of the virtue of high theoretical lithium-ion storage capacity. However, the development of In 2 Se 3- based anode is primarily confined by the poor electronic conductivity and inevitable volume variations. Moreover, the lithium − ion storage mechanism of In 2 Se 3 - based electrode is still not clear. Here, we report a facile construction strategy for metal-organic frameworks (MOFs)-derived In 2 Se 3 nanocrystals encapsulated in porous nitrogen − doped carbon conductive matrix (In 2 Se 3 /PNC). The In 2 Se 3 /PNC with porous structure and rich N − doped carbon affords highly efficient channels for rapid transportation of ions and electrons. Meanwhile, as the heterogeneous structure provides sufficient void space to relieve the internal mechanical stress during the repeated charge–discharge processes. Thus, the optimized In 2 Se 3 /PNC − 800 (annealed at 800 °C) electrode exhibits a capacity as high as 1038 mAh/g at 200 mA g −1 , remarkable cycling stability over 2000 cycles and a comparable high-rate capability. Moreover, the reaction mechanism of the In 2 Se 3 with Li + is revealed through in-situ XRD and density functional theory (DFT) simulations. This study may present broad opportunities for reliable construction of high-capacity selenium-based composites for energy storage.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Bo Cao,Yiwei Li,Mingjian Zhang,Ningyan Cheng,Ming Shen,Bingwen Hu,Jianyuan Li,Zhibo Li,Shenyang Xu,Wenguang Zhao,Ni Yang,Junliang Sun,Shixue Dou,Yang Ren,Haibiao Chen,Liang Yin,Feng Pan
In the practical operations of Li-ion batteries , inevitable deep charge/discharge happens locally due to the intrinsic (de)lithiation inhomogeneity at the electrode and particle level, which would damage the health of batteries and even cause the safety concern. It is essential to develop the stable cathodes operating in a wide voltage window to ensure the health and safety of Li-ion batteries. Herein, we comprehensively investigate the charge/discharge behaviors of a representative Li-rich cathode Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 in a wide voltage window of 1.0–4.8 V, and reveal that, deep-lithiation would drive violent TM migration and severe Li/TM mixing, thereby leading to the irreversible structural transformation from layered to spinel then to rock salt, eventually causing the fast decay in electrochemical performance. Based on these understandings, a novel Li-rich cathode Li[Li 1/4 Mn 1/2 Ni 1/6 Sb 1/12 ]O 2 is successfully synthesized through introducing aromatic Sb@Ni 6 superstructure units in the TM layers. The introduced Sb@Ni 6 superstructure units can effectively tune the local oxygen environment, suppress TM migration, and stabilize the layered framework under deep lithiation . Finally, a stable charge/discharge is achieved in 1.0–4.8 V. This work deepens the understanding into the structural stability of Li-rich cathodes in a wide voltage window, and benefits the development of high-energy-density and safe cathodes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Kai Zhang,Caixia Li,Yu Zhang,Xiaoni Liu,Minghui Wang,Lei Wang
The fast development of lithium-sulfur (Li-S) batteries is catching more attention to improve cycling stability and kinetics. Herein, a hierarchical porous Ni/NiO/C microsphere (NIONC) with openings assembled by ultrathin nanosheets is introduced to solve the poor conductivity, shuttle effect, and slow electrochemical kinetics of Li-S batteries. The structure of NIONC open-hollow microcapsules combines several advantageous properties for the improvement of electrochemical performances. Primarily, a well-developed hollow structure and openings can perform as containers and doors for sulfur immobilization. Therefore, the confinement effect to sulfur species is obtained by this hollow sphere. Secondly, the nanosheets with oxygen vacancies and Ni active sites provide abundant active sites for the chemical absorption of polysulfides. Based on the open structure and oxygen vacancies of Ni/NiO, both the physical absorption and chemical immobilization of sulfur are realized, with high stability and fast kinetics. The S-injected NIONC (NIONC/S) cathode exhibits outstanding rate performance at 5 A g -1 with a high capability of 794 mAh g -1 and excellent long-cycle performance of 653 mAh g -1 after 300 cycles at 1 A g -1 . We proposed a simple and controllable route to fabricate sulfur hosts by structure and composition adjustment, which will inspire the commercial application of Li-S batteries.
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Applied Materials Today
·
2022
·
IF 8.663
Yun Zhao,Jianhua Yan,Jianyong Yu,Bin Ding
Li-metal batteries are promising candidates for next generation rechargeable batteries. However, the hazards caused by the growth of Li-dendrite and enormous volume fluctuations during cycling hinder its practical applications. Here, to solve these problems, a flexible mixed ion-electron conducting fabric scaffold is constructed by uniformly incorporating Li 0.33 La 0.56 TiO 3 nanoparticles into a 3D carbon nanofiber skeleton. The mixed conductor fabric cannot only homogenize the distribution of electric filed and alleviate volume changes, but also can accelerate the migration and distribution of Li + , thus achieving uniform Li plating/stripping behavior by balanced ion/electron transport. Consequently, the obtained stable and dendrite-free Li-metal anode has a notable cycling stability and rate performance. This work provides a promising direction for the design of practical composite Li-metal anodes.
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Materials Today Energy
·
2022
·
IF 9.257
Bofei Li,Zhao Li,Haoyuan Chen,Xu Zhang,Shuaijin Wu,Hao Xu,Yingying Yao,Yinghui Li,Xiaolong Li,Zhigang Hu,Richard M. Laine,Jianxin Zou,Kemin Zhang
Rechargeable magnesium ion batteries (MIBs) with intercalation materials as the cathode are found to offer better performance in Li + based electrolytes. Herein, we compare the electrochemical performance of MIBs using all-phenyl complex (APC) electrolytes before and after adding Li + additives with layered MoS 2 cathodes. We coincidentally describe the lithiation mechanism that leads to a phase transition whereby Li + additives accelerate a MoS 2 structural transformation from 2H to 1T which accounts for the superior battery performance (150 mAh/g, around two times the capacity of that without Li + additives). In this process, MoS 2 is partly exfoliated into single-layer nanosheets during cycle as evidenced by operando electrochemical synchrotron X-ray diffraction, ex situ X-ray photoelectron spectroscopy and scanning electron microscopy analyses. Accordingly, electrochemical cells with pre-exfoliated MoS 2 nanosheets (liquid phase exfoliation) require fewer activation cycles (50 cycles, a quart of the cycles that using pristine MoS 2 ) in APC electrolyte and better rate performance. Our work thus provides new insight in designing high-performance rechargeable MIBs by optimizing the intercalation cathodes using Li + additives.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jie Zhao,Yuyan Zhao,Wen-ce Yue,Xue Li,Ning Gao,Yu-jiao Zhang,Chao-quan Hu
The shuttle effect caused by soluble lithium polysulfides (LiPSs) hinders the practical application of lithium–sulfur batteries. The sluggish reaction kinetics of LiPSs results in rapid capacity decay. In this work, we constructed a free-standing multifunctional interlayer decorated with V 2 O 3 /VN catalysts to suppress the shuttle effect and boost the redox reaction kinetics. The introduction of VN with strong chemical adsorption improves the conductivity of V 2 O 3 , which is beneficial for the kinetics of conversion reaction. In addition, the micro/mesopores inside the structure not only facilitate ion diffusion but also buffer the volume change of the sulfur cathode during the cycling process. Benefiting from the synergistic effects, the fabricated cells exhibit a high specific capacity of 1419.5 mAh g −1 at 0.1C. The cell with V 2 O 3 /VN/C exhibits a promising cycling performance over 1000 cycles with a decay rate of 0.037% per cycle at 1C. The synergistic effects of electrocatalysts and conductive carbon material provide inspiration on the development of high-performance Li–S batteries.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Can Huang,Zhuojie Li,Shanshan Duan,Shuhong Xie,Shuoguo Yuan,Shuen Hou,Guozhong Cao,Hongyun Jin
Sodium super-ionic conductors (NASICON)-type electrolyte Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LATP), with high ionic conductivity and low cost, is considered as one of the most attractive alternatives to liquid electrolytes . However, the poor interfacial compatibilities of LATP electrolyte in lithium batteries lead to the failure, which hinders its further development. Herein, a MoS 2 coating layer as an artificial solid electrolyte interphase (ASEI) is used for modifying the surface of LATP (MCLATP) via an economical and uncomplicated spin coating method, which not only effectively inhibits the decomposition of LATP, but also in-situ forms a conversion layer consisting of Li 2 S and Mo metal during cycling. The conversion layer can improve the interfacial charge transfer kinetics and decrease the charge transfer resistance . According to interfacial modification of MoS 2 , the symmetric cells show slight polarization, and the Li/MCLATP/LFP cells demonstrate excellent cycling performance over 300 cycles at 1 C. The enhanced batteries performance is ascribed to interfacial modification of MoS 2 as an ASEI layer, which reduces interfacial concentration polarization caused by the formed microcracks around the surface during decomposition of LATP. This work provides a promising strategy to construct the interface between Li metal and solid-state electrolytes for other unstable electrolytes beyond NASICON .
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Xiang Li,Jianwei He,Yucong Liao,Shaoshan Zhu,Yayun Tang,Hanyang Li,Ning Lv,Yuexin Xu,Yadong Wang
Herein, a conjugate carbonyl polyimide (MF-PI) and nano-silicon composite (MF-PI/Si) is designed and synthesized through a simple one-pot method to confront rapid capacity fading and complicated electrode material preparation in silicon-based electrodes for lithium ion battery . This composite can be directly used to prepare electrode without the need of further adding of binding materials. In this composite, MF-PI acts as binder for powder electrode, active reversible lithiation material, buffering media to alleviate volume change of silicon particles, and coating shell to avoid the direct contact between silicon particles and electrolyte. These functions from MF-PI collectively assigned the MF-PI/Si composite anode material a relative high specific capacity and excellent cycling stability. The electrode prepared by this as-synthesized MF-PI/Si shows preferable electrochemical interface and surface area, further enhancing the electrode kinetics and then electrochemical performance. The improved ionic and electronic conductivity compared to other binder materials also contributes the excellent performance.
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Small
·
2023
·Vol. 19
·期 46
·2305326
·
IF 13.3
Shida Xue,Shiming Chen,Yanda Fu,Hengyao Zhu,Yuchen Ji,Yongli Song,Feng Pan,Luyi Yang
Composite solid electrolytes (CSEs) consisting of polyethylene oxide (PEO) matrix and active inorganic fillers have shown great potential for practical applications. However, mechanisms of how different active fillers enhance ion transport in CSEs still remain inconclusive. In this work, the component dependencies of ionic conductivity of PEO-based CSEs are investigated by comparing two widely investigated active fillers: NASICON-type (LATP) and garnet-type (LLZTO). In terms of ionic conductivity, the optimum ratios are strikingly different for LLZTO (10 wt%) and LATP (50 wt%). Through experimental and computational studies, it is demonstrated that the high affinity between LATP and PEO facilitates unhindered interfacial Li + transfer so that LATP functions as a bulk-active filler to provide additional inorganic ion pathways. By contrast, Li + transfer between LLZTO and PEO is found to be sluggish. Instead, LLZTO mainly improves ionic conductivity by dissociating lithium salt, making it a surface-active filler. Through categorizing active fillers based on their Li + conductive mechanisms, this work provides new understanding and guidelines for componential design and optimization of solid composite electrolytes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shan Yin,Xin He,Xiande Zhang,Yan Hao,Kaipeng Wu,Yun Zhang
Iron oxide/graphene hybrids are outstanding electrodes with high specific capacity for secondary batteries. However, in practice there still remains challenges in alleviating the poor electrical conductivity and significant volume changes of FeO x during the lithiation/delithiation process. Herein, we describe the discovery of fabricating graphene-wrapped Fe 3 O 4 (3D-rGO/Fe 3 O 4 ) via a solution-based self-assembly process. During which, GO/Fe 3 O 4 /Na 2 SO 4 precursor was first formed by the corrosion reaction of metallic Fe in GO aqueous solution and antisolvent self-assembly, which was then quenched into water to dissolve the Na 2 SO 4 template and meanwhile enable the GO to shrink and encapsulate the Fe 3 O 4 nanoparticles spontaneously, followed by a final thermal reduction. Fe 3 O 4 nanoparticles, with a diameter of tens of nanometers, are homogeneously enwrapped into rGO framework, guaranteeing the “plane-to-plane” interconnection. The obtained 3D-rGO/Fe 3 O 4 demonstrates unprecedented Li-storage behaviors when utilized as Li-ion battery anode. Furthermore, quantitative kinetic analysis revealed that both capacitance and diffusion mechanisms account for Li-storage behavior. This contribution not only presents a ultrahigh-performance Li-storage electrode but also shows a novel methodology to design and construct other graghene-based metallic compounds for various applications.
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