IONICS
·
2018
·Vol. 25
·期 4
·1607-1615
·
IF 2.347
Lu Yang,He Ke-Wu,Zhang Shu-Jian,Zhou Yu-Xiang,Wang Zhen-Bo
An all-solid-state polymer electrolyte has been prepared by polymerizing a monomer ethoxylated trimethylolpropane triacrylate (ETPTA) using ultraviolet irradiation (UV-curing) into crystal electrolyte (referred to as UV-PCCE) in this paper, which has the merit of outstanding interfacial compatibility with electrode materials. Otherwise, on account of the appearance of a unique plastic-crystalline phase, this polymer electrolyte presents a great electrochemical window (4.78 V vs Li/Li + ) and a high ionic conductivity at ambient temperature. The cell of LiFePO 4 /UV-PCCE/Li displays a high initial discharge capacity of 147.1 mAh g −1 at 0.5 C and 118.0 mAh g −1 at a rate of 8.0 C at room temperature. At the same time, it may deliver a high initial discharge capacity of 150.0 mAh g −1 and the coulombic efficiency approximate 100% over 120 cycles at 2.0 C at 55 °C. Its superior performances demonstrate that the UV-PCCE-based electrolyte via an ultraviolet irradiation is applied to the actual, which can be used for high-performance lithium-ion batteries. This technology can also be compatible with existing lithium-ion battery equipment.
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APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Yajin Li,Jiaxiong Liu,Dehua He
The trans-esterification of glycerol and dimethyl carbonate (DMC) for the synthesis of glycerol carbonate was investigated over a series of Li-La 2 O 3 catalysts with different Li contents under mild reaction conditions. Li-La 2 O 3 catalysts were prepared by simple precipitation and impregnation methods, and characterized using ICP, XRD, BET, XPS, CO 2 -TPD and TEM techniques. It was found that the basicity of La 2 O 3 was obviously changed and the interaction between Li and La 2 O 3 occurred after doping Li component, and the catalytic activity of Li-La 2 O 3 was highly relevant to the strength and content of basic sites on the catalysts. Li doping influenced the crystal phase growth of La 2 O 3 , and also changed the exposed crystal planes of the Li-La 2 O 3 catalysts. The highest catalytic performance was obtained over 3.50Li-La 2 O 3 catalyst calcined at 600 °C for 5 h. The glycerol conversion of 94.4% and glycerol carbonate selectivity of 92.1% were obtained over this catalyst under the proper reaction conditions of 85 °C, 3 h, and the molar ratio of glycerol and DMC being 1/3 with using 0.1 g 3.50Li-La 2 O 3 catalyst.
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JOURNAL OF MATERIALS RESEARCH
·
2018
·Vol. 33
·期 16
·2376-2384
·
IF 1.495
Yuanyuan Su,Ying Zhang,Ronglan Zhang,Fei Yang,Jianshe Zhao
Two series of binuclear metal phthalocyanine complexes M2(PcTN)2Nap and M2(PcTA)2Nap (M = Mn2+, Fe2+, Co2+, Cu2+) were designed and synthesized through the liquid solvent method and amination reaction. Elemental analysis, IR, and UV-vis spectroscopy were applied to characterize the compounds. To evaluate their catalytic performance, all the compounds were respectively added into the electrolyte of Li/SOCl2 battery systems as well as three-electrode systems for cyclic voltammetry (CV) measurements. The research studies indicate that the average discharge voltage and discharge time of the battery could be effectively enhanced by 0.2440 V and 810.7 s when compared with the battery in the absence of the compounds. As for capacities of the batteries containing catalysts, they were also found to have an improvement of 51.78–91.62%. Among the effects of diverse metal ions on the catalytic performance of phthalocyanines, the complexes whose center metal ions were Mn2+ or Co2+ exhibited relatively high catalytic performance. Meanwhile, combined with experimental results of CV analyses, the suggested catalytic mechanism of binuclear phthalocyanines for catalyzing Li/SOCl2 batteries had been proposed.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Qing Xuan Shi,Hui Jie Pei,Na You,Jingyi Wu,Xiao Xiang,Qing Xia,Xiao Lin Xie,Shang Bin Jin,Yun Sheng Ye
The shuttling of polysulfides during discharging/charging processes is a major challenge that severely hinders the widespread use of lithium-sulfur batteries (LiSBs). Here, a group of scaled-up covalent triazine frameworks (CTFs) were explored under relatively mild reaction conditions to reduce reaction related interactions. Triazine shows good chemical compatibility with lithium polysulfide though its pyridinic and pyrrolic nitrogen groups, while hierarchical microporous structures interact physically as a blocking layer. Moreover, the dual chemical/physical functional CTFs act as an ionic sieves owing to their two-dimensional microporous structures that selectively sieve desired lithium ions, while effectively inhibiting soluble polysulfides reaching the lithium anode. As a result, the CTFs coated on commercial separator enhance battery performance, through improved active material utilization, high reversible specific capacity (1249 mA h g −1 at 0.5 C), an ideal rate performance of 802 mA h g −1 at 2 C, good cycling stability with a low capacity fade-rate of 0.052% per cycle over 800 cycles at 1 C, good anti-self-discharge behaviour and enhanced protection of the lithium anode.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Tiantian Gu,Min Zhou,Bing Huang,Shengling Cao,Juan Wang,Yun Tang,Kangli Wang,Shijie Cheng,Kai Jiang
Conjugated multi-ring polymers with heteroatoms (N, S or O etc.) are promising anode materials for lithium ion batteries (LIBs) owning to resource sustainability, molecular diversity and high electronic conductivity. Among these, cyclized polyacrylonitrile (cPAN) is investigated as a novel lithium storage anode in this work. Theoretical calculations and electrochemical characterizations demonstrate that the conjugated N and C atoms in the heterocyclic polymers can both act as the redox sites for Li + uptake/release, thus giving an ultra-high theoretical capacity. Benefiting from the multiple redox centers and highly conjugated structure, cPAN nanofibers demonstrate super-high reversible capacity (1375 mA h g −1 at 0.05 A g −1 ), excellent rate capability (383 mA h g −1 at 10 A g −1 ) and remarkable long cycling life over 10,000 cycles. This work may shed light on the development of sustainable and versatile organics as lithium-storage electrodes.
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IONICS
·
2019
·Vol. 25
·期 10
·4751-4760
·
IF 2.289
Li Ruopeng,Wang Bo,Gao Tiantian,Bao Changyuan,Song Rensheng,Wang Dianlong
A LiAlCl 4 ·3SO 2 -NaAlCl 4 ·2SO 2 binary inorganic electrolyte was prepared by using NaAlCl 4 ·2SO 2 as the functional additive and mixing with LiAlCl 4 ·3SO 2 . The obtained LiAlCl 4 ·3SO 2 -NaAlCl 4 ·2SO 2 not only has good non-flammability but also exhibits improved electrochemical performance for Li-metal batteries. With the addition of NaAlCl 4 ·2SO 2 , the fabricated Li/Cu cells using mixed inorganic electrolyte display higher average coulombic efficiency and more excellent cycling stability. Through scanning electron microscopy (SEM) characterization, it is demonstrated that the surficial morphology of Li-deposited layer is smoother in LiAlCl 4 ·3SO 2 -NaAlCl 4 ·2SO 2 binary electrolyte system than pure LiAlCl 4 ·3SO 2 . Furthermore, the fabricated Li/graphite cells using LiAlCl 4 ·3SO 2 -NaAlCl 4 ·2SO 2 binary electrolyte also show higher specific capacity and better cycling stability than using pure LiAlCl 4 ·3SO 2 electrolyte as well as the conventional organic electrolyte (1 M LiPF 6 in ethylene carbonate/dimethyl carbonate mixed solvent with 1:1 in volume). Consequently, LiAlCl 4 ·3SO 2 -NaAlCl 4 ·2SO 2 is proposed to have great potential for the safe and high-performance Li-metal batteries.
A LiAlCl 4 ·3SO 2 -NaAlCl 4 ·2SO 2 binary inorganic electrolyte is prepared by using NaAlCl 4 ·2SO 2 as the functional additive and mixing with LiAlCl 4 ·3SO 2 , which exhibits improved electrochemical performance for Li-metal batteries
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 19
·期 8
·2421-2429
·
IF 2.446
Wang Xiaofei,Cai Shengrong,Zhu Ding,Mu Shijia,Chen Yungui
A lithium (Li)–oxygen (O 2 ) battery based on an inorganic solid-state air cathode was fabricated, and the influence of water vapor (key component in the air) on the electrochemical behavior of the proposed Li–O 2 battery was deeply investigated. Excluding the negative influence of the corrosion of Li anode that existed in organic-based electrolyte Li–O 2 battery when operated in wet environment, our results showed that water vapor has a positive effect on the discharge and cycling performances of the Li–O 2 battery using a solid-state air cathode. The discharge capacity reached 11734 mA h g −1 (7.8 mA h cm −2 ) in wet O 2 , which was not markedly different with that in dry O 2 (11956 mA h g −1 (8.0 mA h cm −2 )). However, the discharge voltage in wet O 2 was about 110 mV higher than that in dry O 2 . Although the formation of LiOH increased the charge overpotential, the formed LiOH in turn minimized the decomposition of carbon to form Li 2 CO 3 , and enhanced the cycling performance to a certain extent. In addition, we showed that the polarization involved by water vapor could also be largely decreased by slightly increasing the operating temperature; the charge voltage plateau decreased from 4.04 to 3.3 V when the temperature increased from 25 to 50 °C. These results suggest that the Li–O 2 battery using a solid-state air cathode is promising for practical application, especially in wet environment.
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MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Ming Song,Xihua Du,Yan Chen,Lei Zhang,Ding Zhu,Yungui Chen
Among all the factors that restrict the application of Li–air battery, large charging polarization, due to the poor bulk charge transport ability of discharge product Li 2 O 2 , comes first. In this paper, we adopt the method of controlling discharging temperature to reduce the charging polarization during the first cycle of Li 2 O 2 based on the fact that controlling discharging temperature can reduce Li 2 O 2 bulk charge transport path since finer Li 2 O 2 particles can be observed at higher temperature. The mechanism of reducing charging polarization simply through increasing the discharging test temperature has also been researched in this paper.
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SOLID STATE IONICS
·
2015
·
IF 2.561
Yaohui Qu,Zhian Zhang,Yanqing Lai,Yexiang Liu,Jie Li
A novel bimodal porous carbon (BPC) with high surface area was prepared by a simple hydrothermal route and KOH activation process , and the Se–BPC composite was synthesized for lithium–selenium batteries by the melt-diffusion method. It is found that the elemental selenium was dispersed inside the pores of BPC based on the analyses. Electrochemical tests reveal that the Se–BPC composite has a large reversible capacity and high rate performance as cathode materials . The Se–BPC (45.1 wt.% Se) composite displays an initial discharge capacity of 552 mAh g − 1 and a reversible discharge capacity of 264 mAh g − 1 after 80 cycles at 1 C charge/discharge rate. In particular, the Se–BPC composite presents a durable cycling performance at high rate of 2 C. These outstanding electrochemical features of Se–BPC composite cathode should be attributed to the uniform BPC with high surface area and bimodal porous structure . The bimodal porous carbon would be a promising carbon matrix to develop high performance lithium–selenium batteries.
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CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Shengli Pang,Yonggang Wang,Tao Chen,Xiangqian Shen,Xiaoming Xi,Daqian Liao
Lithium (Li)-rich layered oxides are considered promising cathode materials for Li-ion batteries because of their favorable properties. Here, we report our recent finding in the novel oxide, aluminum fluoride (AlF 3 )-modified Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMNCAF), which was synthesized via a facile, cost-effective and readily scalable solid-state reaction. LMNCAF possess an F and Al co-doped core structure with a LiF nano-coating on its surface which leads to considerably enhancement in the electrochemical performance of the oxide. The initial discharge capacity (at 0.05 C) increased from 212 mA h g −1 for Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 to 291 mA h g −1 for LMNCAF. A much higher discharge capacity of 211 mA h g −1 was obtained for LMNCAF after 99 charge/discharge cycles at 0.2 C compared with that of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (160 mA h g −1 ). Our preliminary results suggest that AlF 3 modification is an effective strategy to tailor the physicochemical and electrochemical properties of Li-rich layered oxides.
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Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 33
·13277-13282
·
IF 0
Ru-Jun Chen,Mian Huang,Wen-Ze Huang,Yang Shen,Yuan-Hua Lin,Ce-Wen Nan
Li–La–Zr–O thin films were successfully fabricated using a sol–gel spin coating method, and the effects of altering the annealing temperature and the number of layers of the films on electrolyte conductivity were studied. Using X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy, the characteristics of these films were investigated as a function of annealing temperature and the numbers of layers of the film. With these methods, an amorphous structure and a smooth surface on the films were revealed. The thin film's ionic conductivity was investigated by impedance analysis. The results show that the ionic conductivity of the films decreases with an increase of the annealing temperature, from 1.67 × 10−6 S cm−1 for 600 °C annealing to 8.53 × 10−7 S cm−1 for 800 °C annealing. The influence of film thickness on conductivity was investigated and the conductivity followed an inverse u-shaped curve with increasing film thickness. We propose that Li–La–Zr–O thin films may be promising solid electrolytes for solid-state lithium-ion batteries.
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RSC Advances
·
2016
·Vol. 6
·期 42
·36118-36124
·
IF 3.289
Y. Feng,W. L. Li,D. Xu,W. P. Cao,Y. Yu,W. D. Fei
Recently, we proposed a new approach (Li+–Al3+ ionic pairs doping) to enhance the piezoelectric properties of BaTiO3 ceramic. Here we sequentially prove that Li+ and Al3+ can also enhance the piezoelectric properties of PbZr0.52Ti0.48O3 (PZT) ceramic. The X-ray diffraction results demonstrate the optimized distribution of Li+–Al3+ ionic pairs parallel to the [001] direction in the doped ceramics, as same as the results in BaTiO3-based ceramic. The doped ceramics exhibit constricted hysteresis loops, which is associated with the restoring force of Li+–Al3+ ionic pairs as a result of the Coulomb force between Li+ and Al3+ ions. The results show that the piezoelectric properties and corresponding temperature stability of the doped ceramics were enhanced significantly. The analysis and conclusion indicate that the piezoelectric mechanism coming from ionic pairs applies equally well to the PZT ceramic. Co-doping Li+ and Al3+ into the A-site is a preferable approach for the piezoelectric property enhancement of ABO3 ferroelectric ceramics.
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