JOURNAL OF RARE EARTHS
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2022
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IF 4.632
Yangyang Sheng,Liyan Ming,Lin Liu,Peng Lin,Junpeng Shi,Liang Song,Yun Zhang
In recent years, white persistent luminescence materials have received extensive attention due to the potential application of white light in the field of plant growth lighting. The white persistent luminescence materials synthesized by traditional methods either have strict requirements on the concentration of doped ions or cannot produce white light continuously and stably due to different decay rates of various emission centers, which limits their further application. In our work, we successfully synthesized a novel Li + -doped MgLuGaO 4 phosphor with stable white-light emission and long persistent luminescence. The broadband emission of MgLuGaO 4 :Li + is mainly located at 350 – 650 nm, which has no change at different decay time, showing stable white-light emission. The persistent luminescence intensity is increased by 3.8 times and the persistent luminescence time is extended from 24 h to more than 36 h by doping Li + ions. Stable white-light and long persistent luminescence emission make it promising to be used in plant growth lighting.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2022
·
IF 0.847
Zuhao Zhang,Xiaoyan Xie,Huixian Xie,Xiaokai Ding,Jiaxiang Cui,Chenyu Liu,Dong Luo,Zhan Lin
Cobalt-free Li-rich layered oxides (LLOs) such as Li 1.2 Mn 0.6 Ni 0.2 O 2 have attracted extensive attention owing to their high specific capacity and low cost. Nonetheless, numerous problems such as continuous voltage fading and capacity decay have become stumbling blocks in its commercial application. In this study, we propose an effective dual-site doping strategy by choosing Mo as the cation and F as the anion to enhance the capacity and cycling performance. The research demonstrates that the cycling stability of LLOs enhances with the doping ratio of Mo, and their capacity increases with the doping ratio of F. It is because Mo as a pillar enhances the structural stability and F doping is conducive to the activation of Li 2 MnO 3 . What's more, dual-site doping also promotes the diffusion of Li + and reduces the internal resistance of the electrode. Due to these improvements, the 5F3M sample still maintains a discharge capacity of 190.98 mAh g -1 after 100 cycles at 200 mA g -1 , which is much higher than 165.29 mAh g -1 of the Pristine sample. This discovery provides a new way to develop advanced layered oxide cathodes for both Na- and Li-ion batteries.
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Energy Storage Materials
·
2022
·
IF 20.831
Yan Liu,Yuan Li,Long Chen,Fang Yan,Zhihong Lin,Junmou Wang,Jingyi Qiu,Gaoping Cao,Biyan Wang,Hao Zhang
For high-specific energy Li batteries, hybrid anodes with graphite and Li metal are promising. However, the degradation of graphite-Li metal hybrid anodes during long cycles has been significantly fastened by dendritic Li growth and dead Li accumulation ascribed to the inferior solid electrolyte interphase (SEI). Efficient material construction strategies are highly demanded to inhibit the deactivation of graphite intercalation compounds (GICs: LiC 12 , LiC 6 , etc.) in graphite-Li metal hybrid anodes. Here, we introduced a physical-chemical modification strategy. Which is acted by a combination of a LiF-rich and elastic SEI and preset void in the composite electrodes, which was realized by Cu mesh current collectors, resulting in the retardant of the accumulation of dead Li and side reaction sediments on graphite surface and the retaining of the Li + insertion channels. The strategy ensured the long-term activity of both GICs and Li metal in graphite-Li metal hybrid anodes. Thus, the hybrid anodes obtain higher reversibility of both the lithium-ion insertion/deintercalation and Li metal deposition/dissolution processes. The batteries can maintain a specific capacity of up to 500 mAh/g, with an average CE of 98.5% for 85 cycles. This work presents a novel and effective methodology to realize the high reversibility of the high-capacity graphite-Li metal hybrid anodes.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Caohua He,Jianqi Sun,Chengyi Hou,Qinghong Zhang,Yaogang Li,Kerui Li,Hongzhi Wang
Ionogel electrolytes (IGEs) containing ionic liquids as the unique liquid component can guarantee high ionic conductivity, wide electrochemical window, and high thermal stability simultaneously for developing stable and safe Li metal batteries, yet suffer from relatively low Li + transference. In this work, ceramic ionic conductor-metal organic framework (MOF) core–shell nanocomposites are introduced as active matrix to fabricate a reinforcement layer with a high mechanical modulus. The ceramic core provides Li + conduction pathway and the MOF shell possesses open pores and metal sites for ionic selectivity. Beyond this, the reinforcement layer is sandwiched by two buffer layers with a flexible polymer matrix to improve the interface compatibility and wettability with electrodes. Here, the nanocomposites powder can be synthesized through solid sintering followed by facile in-situ solution growth, promising the scalable production and practical application of the IGEs. As a result, the sandwich-structural IGE shows a high ionic conductivity of 3.87 × 10 −4 S cm −1 at 25 ℃, wide electrochemical window (up to 5.2 V vs Li/Li + ), and high thermal stability. The full cell (LiCoO 2 cathode) maintains 97.9 % capacity after 500 cycles at 0.2 C.
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JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Tianrun Gu,Runnan Zhang,Shiyu Zhang,Benbing Shi,Junhui Zhao,Zhen Wang,Mengying Long,Guangzhe Wang,Ting Qiu,Zhongyi Jiang
The efficient separation of Li + /Mg 2+ is the key to lithium extraction from salt lake brine. Herein, a multi-amino quaternary ammonium salt (3,5-dimethylhydrazide-benzyl trimethyl ammonium bromide, DHTAB) was designed and synthesized to modify pristine polyamide (PA) nanofiltration membranes. DHTAB was grafted on the surface of the PA nanofiltration membrane to construct a positively selective layer for Li + /Mg 2+ separation. The introduction of DHTAB increased the membrane surface charge density to +5.16 mC m −2 , which was nearly three times that of the pristine PA membrane. The increased charge density of the modified membrane led to a stronger Donnan exclusion for Mg 2+ , and accordingly a high MgCl 2 rejection of 99.2%. The modified membranes exhibited a high Li + /Mg 2+ separation factor of up to 60.1, when applied for MgCl 2 and LiCl binary solution, which exceeded all known PA-based nanofiltration membranes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Qi Xia,Jinlong Hu,Qingqing Chen,Lingzhi Zhang
Se as an active material attracts tremendous attention because of its high volumetric capacity and better conductivity than S for rechargeable batteries. Herein, a carbon nanofiber membrane (PM-CNF) is designed and prepared as free-standing Se host by electrospinning the solution of polyacrylonitrile (PAN) and poly(styrenesulfonic acid)-melamine salt, followed by carbonization and activation process. PM-CNF shows super flexibility and high N-doping level of 8.92 % (pyrrolic-N: 2.15 % and pyridinic-N: 3.07 %), which is beneficial for ions diffusion and electrons transformation. The free-standing PM-CNF/Se cathode delivers a high reversible capacity of 570 mAh g −1 at 0.5 C, superior rate capacity of 375 mAh g −1 at 8 C, and stabile cycling over 1800 cycles. The excellent electrochemical performance can be ascribed to high Li-ion diffusion coefficient (2.99 × 10 −9 cm 2 s −1 ) and capacitance-contributed ratio (77.1 % at 0.1 mV s −1 ). The analysis of the charge/discharge process reveals that no polyselenide intermediates are observed during the first cycling process and thus the inhibited shuttle effect of polyselenides over cycling, which primarily contributes to the long cycling stability.
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Journal of Materials Chemistry C
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2021
·Vol. 9
·期 41
·14757-14765
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IF 7.393
Hanyang Li,Feng Wei,Yanzeng Li,Miao Yu,Yu Zhang,Lu Liu,Zhihai Liu
Temperature is a critical parameter for evaluating battery safety during the process of charging and discharging. However, it is a challenge to monitor it accurately because batteries are used in various compact environments such as energy stations. In this study, β-NaYF4:Er3+/Yb3+@NaYF4 nanoparticles were used to fabricate an optical fiber temperature sensor for battery temperature monitoring. The temperature sensing characteristics of the optical fiber sensor were explored in the range of 293–373 K using fluorescence intensity ratio (FIR) technology which can improve the temperature monitoring accuracy. The maximum relative sensitivity of the optical fiber sensor was 1.62% K−1 at 293 K and the temperature detection limit was within ±0.5 °C. By embedding the prepared sensor in a Li-ion battery, the proof of concept was obtained for monitoring the internal temperature of a battery with upconversion nanoparticles (UCNPs). A larger temperature variation was observed under a higher discharge rate. These results indicate that the prepared optical fiber sensor is an active tool for monitoring the thermal behavior and improving the safety of the battery.
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ACS Applied Energy Materials
·
2021
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IF 6.024
Tao Long,Bin Xu,Yixin Zhao,Hu Liu,Sheng Cheng,Yongyi Zhang,Jiehua Liu,Fancheng Meng
The shuttling effect and sluggish redox kinetics of polysulfides are the main obstacles that restrict the practical application of lithium–sulfur (Li–S) batteries. Herein, in this work, cathode material embedded with bipolar metals Ti and Co prepared by a facile self-assembly process using hollow carbon nanospheres (HCSs), MXene nanosheets, and CoO(OH) has been reported. Due to the strong chemical adsorption and high catalytic activity introduced by the bipolar metal related active sites, the Li–S battery with the HCS@Co–MXene/S cathode shows the lowest charge transfer resistance and the best rate capability compared with HCS/S and HCS@MXene/S cathodes. Moreover, the battery delivers a high initial discharge capacity of 1309 mA h g–1, which maintains at 570 mA h g–1 after 300 cycles at 0.5 C. Even at an elevated discharge current of 1 C, the battery retains a reversible capacity of 728 mA h g–1 over 120 cycles. Therefore, with the embedding of bipolar metals, the current Li–S battery cathode demonstrates superior cycling stability than the reference cathodes. The findings in this work exhibit a promising prospect for facile assembling of the high-performance Li–S battery cathode and the resultant device.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Xiao-Xue Wang,Gui-Juan Ji,Ping She,Fei Li,Qing-Chao Liu,Huan-Feng Wang,Ji-Jing Xu
The hysteresis kinetics of carbon dioxide reduction reaction (CDRR) and evolution reaction (CDER) reaction are major barriers toward the practical implementation of lithium-carbon dioxide (Li-CO 2 ) batteries. Herein, a free-standing and binder-free cathode composed of rutile TiO 2 nanorod arrays (TiO 2 NAs) and carbonized natural sponge was designed and realized by a simple seeds-assisted construction. The novel air cathode was found to exhibits a high specific capacity of 4.38 mAh cm −2 and long cycle life of more than 1600 h, as well as the discharge products, which would deposit at the surface of the TiO 2 NAs rather than carbon substrate during the discharge process. The improved performance can be ascribed to the interconnected conductive sponge framework with macropore and mesoporous channels that can house more discharge products, and the reactant molecules can unrestricted contact with the active sites. Furthermore, the good adhesion to the carbon substrate and the numerous available catalytic sites of the TiO 2 NAs contribute intimate contact of the discharge products with the TiO 2 NAs, improving CDRR and CDER kinetics effectively and boosting the electrochemical reactions. This TiO 2 /Sponge represents a promising design in the development of a nature-inspired, self-standing, and binder-free electrode for high-performance Li-CO 2 batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Xin Wu,Jie Zhong,Houji Liu,Yuxi Ren,Haiquan Zhang,Zijing Liu,Ning Wang
Based on the large extraction efficiency of 10–200 μg cm −2 h −1 , the electrolysis-based technology is one of the most promising methods for large-scale extraction of lithium resources from natural seawater. The high potential safety hazard is the inherent defect of the conventional two-electrode electrolytic cell because of the threshold voltage of 3.9 V, which is very close to the decomposition voltage of carbonate electrolytes (4.5–5.0 V). Herein, we designed a novel triple-electrode device, using spinel Li 4 Ti 5 O 12 and 1 M LiPF 6 /FEC + FEMC + HFE respectively as a temporary carrier for storing Li-ions and perfluorinated electrolyte. The threshold voltage of the multi-electrode device is lowered to 2.3 V, which expands the electrochemical window for lithium resource extraction from 1.1 V to 2.7 V. LTO electrode carrier is impossible to electrocatalyze the as-prepared fluoride electrolyte; the compound electrolyte is chemically stable to Li metal as well, avoiding the formation of lithium dendrites . Therefore, the Li 4 Ti 5 O 12 /Li battery exhibits outstanding cycle performances of 99.3% Coulombic efficiency and 95% capacity retention during 250 cycles. Multi-electrode electrochemical devices have shown high safety, stability and extraction efficiency in the practice of extracting Li metal from natural seawater, which is very beneficial to the development of marine mineral resources.
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Journal of Energy Chemistry
·
2021
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IF 9.676
Shun Li,Zhendong Li,Liyuan Huai,Mingming Ma,Kailin Luo,Jiahe Chen,Deyu Wang,Zhe Peng
Lithium (Li) metal is considered as one of the most promising anode materials to build next-generation high-energy–density batteries. Nonetheless, dendritic Li deposition has dramatically hindered the practical applications of Li metal batteries (LMBs). Uniformizing Li deposition is a prerequisite to achieve safe and practical LMBs. Herein, an underpotential deposition (UPD) process is first proposed to alter the kinetic and uniformity of Li deposition morphology. Based on the strong interaction between the Li adatoms and manganese (Mn) based substrate, a competition between the UPD and bulk Li deposition is observed, on which the predominance of the UPD scenario tends to uniformize Li nucleation and deposition by the surface coverage of Li monolayers at potentials that are more positive than the Nernst potential of Li metal. Inspired by this process, an advanced hybrid Mn-graphene oxide structure is developed for Li protection, not only enabling dendrite-free Li anodes for high-capacity and -current density cycling, but also improving the interfacial kinetic of Li metal anodes at subzero temperatures, showing potential applicability in low temperature conditions.
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JOURNAL OF POWER SOURCES
·
2021
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IF 9.127
Suwei Mou,Kai Huang,Min Guan,Xiang Ma,Jun song Chen,Yong Xiang,Xiaokun Zhang
LiCoO 2 is the dominantly used cathode material in lithium-ion batteries. However, its high-rate capacity and cyclability are limited, especially under high charging voltages, mainly due to the high Li + diffusion barrier . To solve it, we purpose a doping scheme based on two foreign elements: one is with tremendously large ionic radius and weak electronegativity , and the other one has an ionic radius slightly larger than Co, an electronegativity a little weaker than Co, and a high binding energy with O. Ba and Ga are chosen according to this criterion, and their doping effects are compared with that of La and Al. Briefly, Ba is superior to La in weakening the attraction of O 2- to Li + because of its weaker electronegativity and larger ionic radius. Meanwhile, Ga is more capable of enhancing the structural stability at high voltages than Al mainly due to its higher binding energy with O. LiCo 0.998 Ba 0.001 Ga 0.001 O 2 increases Li + diffusivity from 0.77 × 10 -14 to 1.06 × 10 –13 cm 2 ∙s -1 , resulting in a significantly enhanced rate capacity of 114.3 mAh g -1 at 10 C, much better than pristine counterpart (1.6 mAh∙g -1 ). Additionally, it exhibits a particularly high capacity of 199.3 mAh g -1 , and 85% capacity retention over 100 cycles at 0.5 C in 3.0–4.5 V.
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