JOURNAL OF MEMBRANE SCIENCE
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2022
·
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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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
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IF 2.88
Yichen Jin,Tao Pang
Upconversion luminescence and optical temperature sensing properties of Yb 3+ /Er 3+ /Li + tri-doped ZnMoO 4 phosphors were investigated. It has been demonstrated that Li + doping affected not only the local symmetry of Yb 3+ and Er 3+ but also the distribution of them in the host lattice. As a result, the significantly improved green upconversion luminescence was obtained when excited at 980 nm. The pumping power dependent photo-thermal behavior was used to evaluate the reliability of upconversion temperature sensing. An accurate temperature scale was established by eliminating the impact of thermal effect, and the sensing ability was evaluated via a comparison with the results reported in literatures.
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高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Wang Zhifeng,Zhang Xiaomin,Zhao Yan,Li Meixian,Tan Taizhe,Tan Minghui,Zhao Zeren,Ke Chengzhi,Qin Chunling,Chen Zhihong,Wang Yichao
Due to the severe volume expansion and poor cycle stability, transition metal oxide anode is still not meeting the commercial utilization. We herein demonstrate the synthetic method of core-shell pomegranate-shaped Fe 2 O 3 /C nano-composite via one-step hydrothermal process for the first time. The electrochemical performances were measured as anode material for Li-ion batteries. It exhibits excellent cycling performance, which sustains 705 mAh g −1 reversible capacities after 100 cycles at 100 mA g −1 . The anodes also showed good rate stability with discharge capacities of 480 mAh g −1 when cycling at a rate of 2000 mA g −1 . The excellent Li storage properties can be attributed to the unique core-shell pomegranate structure, which can not only ensure good electrical conductivity for active Fe 2 O 3 , but also accommodate huge volume change during cycles as well as facilitate the fast diffusion of Li ion.
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Energy Storage Materials
·
2019
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IF 0
Zhikang Liu,Jing Huang,Bin Liu,Dong Fang,Tao Wang,Quanling Yang,Lijie Dong,Guo-Hua Hu,Chuanxi Xiong
For lithium ion batteries , fast charging technology is one of the most important research topics in current society. Transition metal oxides show broad application prospects due to their obvious pseudocapacitive effect. We choose Fe 3 O 4 as the template to design the enhanced pseudocapacitance effect considering of its high theoretical specific capacity and superior structural adjustability . The nanohybrid materials with multiple ionically bonded interfaces accumulated the giant pseudocapacitive effect to obtain superior specific capacity. As a result, the nanohybrid shows a ranking specific capacity over 800 mAh g −1 at 1 A g −1 for 1000 cycles as well as excellent rate capabilities. The existence of interfacial pseudocapacitive effect was confirmed by the kinetic analysis calculating from CV curves. Furthermore, the computation simulation based on the density functional theory (DFT) highly corresponded with our viewpoint about interfacial lithium storage. Our findings pave a novel path for designing novel electrode materials and could further advance the development of lithium-ion batteries with long-term stability and superhigh capacity.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 5
·A757
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IF 3.662
Shijia Mu,Ding Zhu,Wei Liu,Shengrong Cai,Kaifang Zhang,Yungui Chen
Due to the sluggish oxygen reduction reaction (ORR) process of an O2 cathode, the power delivery of aprotic Li-O2 batteries (A-LOBs) is widely considered to be very poor. However, this work demonstrates the transient high-power output of A-LOBs based on the capacitive feature of the O2 cathode, including the intrinsic capacitance of cathode material and the ORR pseudocapacitance of the absorbed O2 on the cathode surface, by using graphene with high specific surface area. The O2 cathode delivers a high specific power of 12 026 W kggraphene−1 while also providing a large specific energy of 1216 Wh kggraphene−1. Pulse-discharge tests show that A-LOBs can achieve the transient high power output at high current via the "capacitor-type", while maintaining the high energy output at low current due to the "battery-type" (ORR). This work indicates that A-LOBs can deliver both high energy density and high transient power, which may be an appeal for the next-generation electric vehicles.
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Energy Storage Materials
·
2018
·
IF 0
Jun Li,Yifei Yuan,Huile Jin,Huihang Lu,Aili Liu,Dewu Yin,Jichang Wang,Jun Lu,Shun Wang
As a promising cathode material for rechargeable lithium ion batteries , tellurium has attracted a great deal of attention due to its high conductivity and high theoretical capacity. Yet, the large volume expansion (~104 vol%) during Li-Te alloying process prevents the application of Li-Te battery . Here, by using a novel one-step nonlinear electrochemical approach, we prepared a Te x S y @polyaniline nanorod composites, in which elemental sulfur is successfully embedded into tellurium matrix to effectively tackle the volumetric variation problem. In situ transmission electron microscopy (TEM) of the Li-Te (de)alloying process on single Te x S y @polyaniline particle demonstrated that the volumetric variation was efficiently suppressed in comparison to the situation of pristine Te particles. Moreover, polyaniline binder effectively trapped Te and sulfur species in its network and guaranteed stable electric contact and fast transport of Li ions , which resulted in significant improvement of the battery performance. Interestingly, the as-obtained composites display a high initial capacity of 1141 mA h g −1 with typical Li-S battery characteristics at a low current density of 0.1 A g −1 , while it shows a good cycling stability at high current density of 5 A g −1 with Li-Te battery features.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Dong Wang,Junshuang Zhou,Junkai Li,Yuanzhe Wang,Li Hou,Faming Gao
Because of its high density, a carbon microsphere is a good candidate for ultrahigh volumetric capacity electrode materials. We find that the synergistic effects of nitrogen and iodine element can tremendously improve the carbon electrode capacity. Here, we present a high volumetric capacity anode consisting of iodine and nitrogen codoping carbon microspheres synthesized by a low-temperature solvothermal route. A reversible capacity of 1418 mAh cm–3, which is much larger than that of commercial graphitic carbon anode, is achieved at a current density of 0.05 mA cm–2 by using these carbon microspheres as anode material. After 100 charge–discharge cycles at 0.1 mA cm–2 and 500 charge–discharge cycles at 1 mA cm–2, carbon microspheres retained volumetric capacities of 1335 and 1090 mAh cm–3, respectively
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MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Xing Liu,Yunhong Jiang,Kefeng Li,Fu Xu,Ping Zhang,Yanhuai Ding
Electrochemically active SnO 2 materials are prospective alternatives for graphite toward better flexible LIBs. However, significant volume changes and structural pulverization restrict the cycling stability and high capacity of SnO 2 . Here, we report a binder and conductive additive free core-shell N-doped carbon @SnO 2 hybrid paper by a subtle coaxial-electrospinning method. Core-shell N-doped C@SnO 2 fibers not only offer rapid ionic transport and sufficient buffer space for the volume expansion during the Li insertion and extraction reactions, but also enable high flexibility against both compression and bending deformation. As an anode for LIBs, the hybrid materials delivered a large initial capacity of 1799 mAhg −1 with capacity retention of 729 mAhg −1 after 100 cycles at a current rate of 390.5 mAg −1 . More importantly, flexible N-doped C@SnO 2 fabrics exhibit excellent electrochemical performance even after a rough treatment, suggesting a facile strategy for the fabrication of electrochemically stable electrodes for flexible LIBs.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2017
·Vol. 164
·期 14
·E580
·
IF 3.259
Shu Huang,Min Zhou,Kangli Wang,Shijie Cheng,Guoping Yan,Kai Jiang
The novel material K1.35Ti8O16@C was successfully fabricated via an effective, controllable, and cost-effective electrochemical synthetic method and further evaluated as an anode material for lithium-ion batteries (LIBs). This material delivered high reversible capacities of ∼320 mAh g−1 at 50 mA g−1 and excellent long-term cycle stability (135 mAh g−1 after 2000 cycles at 1 A g−1) owing to the high electronic conductivity and fast reversible electrochemical Li-intercalation/extraction behavior of the nanowire structure of K1.35Ti8O16.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bohua Li,Jingning Lai,Fengling Zhang,Wen Sun,Zhengqiang Hu,Boshun Gui,Nan Chen,Li Li,Feng Wu,Renjie Chen
LiI in Li-O 2 batteries has shown promise in reducing charge overpotential. However, the shuttle effect of oxidated iodine species (OISs) can lead to lithium metal corrosion and loss of OISs. During the discharging process, these iodine species can undergo side reactions, resulting in the accumulation of LiOH and other parasitic products, which in turn accelerates battery failure. In this work, we have drawn inspiration from mussel protein and utilized a simple co-deposition method to form a robust biomimetic functionalized coating on the surface of the glass fiber separator. This was achieved by grafting catechol/polyamine (CA/PA) with 11-mercaptoundecanoic acid (MUA). This separator exhibits strong electrostatic repulsion towards negatively charged OISs and, conversely, electrostatic attraction towards Li + , this dual action effectively suppresses the shuttle effect and facilitates Li + transport. When equipped with this modified separator, the Li-O 2 battery effectively reduces the accumulation of LiOH and demonstrates significantly enhanced rate performance and cycle stability. Our findings provide a versatile approach for the design of modified separators for Li-O 2 batteries with redox mediators (RMs).
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Li Wei,Zhang Menghang,Sun Xinyi,Sheng Chuanchao,Mu Xiaowei,Wang Lei,He Ping,Zhou Haoshen
Li-CO 2 batteries offer a promising avenue for converting greenhouse gases into electricity. However, the inherent challenge of direct electrocatalytic reduction of inert CO 2 often results in the formation of Li 2 CO 3 , causing a dip in output voltage and energy efficiency. Our innovative approach involves solid redox mediators, affixed to the cathode via a Cu(II) coordination compound of benzene-1,3,5-tricarboxylic acid. This technique effectively circumvents the shuttle effect and sluggish kinetics associated with soluble redox mediators. Results show that the electrochemically reduced Cu(I) solid redox mediator efficiently captures CO 2 , facilitating Li 2 C 2 O 4 formation through a dimerization reaction involving a dimeric oxalate intermediate. The Li-CO 2 battery employing the Cu(II) solid redox mediator boasts a higher discharge voltage of 2.8 V, a lower charge potential of 3.7 V, and superior cycling performance over 400 cycles. Simultaneously, the successful development of a Li-CO 2 pouch battery propels metal-CO 2 batteries closer to practical application.
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RSC Advances
·
2017
·Vol. 7
·期 53
·33544-33551
·
IF 3.108
Ying Feng,Junjie Gu,Feng Yu,Chunfu Lin,Jinli Zhang,Ning Nie,Wei Li
A series of non-stoichiometric carbon-coated lithium iron phosphate (LiFexPO4/C) have been prepared by a solid-state reaction to study the variation of electrochemical performance at different x values. Characterized by XRD in conjunction with Rietveld refinement, Mössbauer, TEM, Raman, etc., it is indicated that the Li–O bond is elongated in the Fe-poor non-stoichiometric lithium iron phosphate with decreasing x value, while the content of Fe2P and graphitization degree of carbon layer in LiFexPO4/C samples is associated with the ratio of x. The powder electronic conductivity increases from 8.33 × 10−2 S cm−1 to 16.67 × 10−2 S cm−1 as the x value decreases from 1.04 to 0.98, which is due to a suitable amount of Fe2P and a superior graphitized carbon layer. Among different Fe/Li ratios, LiFe0.98PO4/C exhibits the highest rate capability of 163.5 mA h g−1 at 0.1C and 93.5 mA h g−1 at 20C, as well as the largest diffusion coefficient of 12.6 × 10−14 cm2 s−1. It is illustrated that the synergy effect of elongated Li–O bonds, moderate Fe2P and graphitized carbon layer results in the high performance of non-stoichiometric LiFexPO4/C.
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