JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Xirui Kong,Yichen Kong,Lang He,Wenna Zhang,Yi Song,Sheng Liu,Yan Zhao
A new ether-based electrolyte with tetrahydrofuran (THF) and di-isopropyl ether (DIPE) is proposed for Lithium–Sulfur battery (LSB). By employing the common ion effect and the weakly-solvating solvent (such as DIPE), the dissolution of lithium polysulfides and the self-discharge effect are effectively inhibited. Besides, the LiFSI has be used as the co-salt in the LiTFSI-based electrolyte to improve the ionic conductivity and inhibit the side reaction on Li metal anode . It is worth mentioning that, the L1L2TD-1382 electrolyte (LiTFSI: LiFSI: THF: DIPE = 1 : 3: 8 : 2, molar ratio) ensures a stable cycling for more than 500 cycles with a high Columbic efficiency (CE) of Li deposition/stripping (>99.3%). Impressively, with selenium doped sulfurized polyacrylonitrile (SeSPAN) cathode, the Li–S cell has delivered a high capacity of 626 mAh g −1 in 500th cycle with an excellent capacity retention no less than 93%. This work provides a new insight to electrolyte design strategy of advanced electrolytes for Li–S batteries .
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Materials Today Chemistry
·
2023
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IF 7.3
Zheng Lu,Dashuai Sun,Zeyu Lyu,Sida Shen,Xiaowei Zhang,Shuai Wei,Pengcheng Luo,Luhui Zhou,Hongpeng You
Light-emitting diodes (LEDs) can regulate the light environment for plant growth to increase productivity. Deep blue light, which plays a pivotal role in plant photosynthesis, has received limited attention in research due to the challenges associated with synthesizing a blue phosphor exhibiting high thermal stability, high quantum efficiency and spectral similarity to plant response spectra. This study presents the synthesis and characterization of a blue phosphor Ca 4 MgAl 2 Si 3 O 14 :xCe 3+ ,yLi + , which is characterized by remarkable thermal stability and quantum efficiency reached through charge compensation. The introduction of Li + ions eliminates cation vacancy defects , mitigates charge imbalance due to heterovalent substitution, and acts as a flux, thereby effectively suppressing energy transfer between Ce 3+ ions and significantly improving several key properties of the phosphor. Notably, the emission intensity is significantly enhanced, the internal quantum efficiency was increased from 74.2 to 91.6 %, and the external quantum efficiency was improved from 54.9 to 67.7 %. Moreover, the thermal stability at 423 K was augmented from 71 to 82 %. Of particular importance is the exceptional alignment of the phosphor's spectrum with the absorption spectrum of chlorophyll-a (with a spectral resemblance of SR chlorophyll-a = 94.39 %). These findings underscore the great potential of Ca 4 MgAl 2 Si 3 O 14 :xCe 3+ ,yLi + phosphors in applications related to plant growth lighting.
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Journal of Energy Storage
·
2023
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IF 9.4
Yuan Qiao,Ali Reza Kamali
Thermally modified polyimide (PI) is investigated as an efficient binder to enhance the Li-ion storage performance of silicon nanoparticles . Heat-treatment of Si@PI electrodes results in an optimized charge transfer complex (CTC) structure, which improves the electrochemical performance of the electrode by forming a compact structure that reduces the charge transfer impedance, significantly enhancing the cycling performance of the silicon anode . Electrodes subjected to the heat-treatment at 350 °C (Si@PI-350) exhibit a charge transfer impedance of 37.67 Ω combined with a reversible Li + storage capacity of 2334 mAh g −1 recorded after 30 cycles at 200 mA g −1 , in comparison to the original Si@PI electrodes showing an enhanced impedance value of 130.4 Ω and reduced capacity of 737 mAh g −1 . At a high current density of 2000 mA g −1 , the capacity of Si@PI-350 (1001 mAh g −1 ) is significantly greater than Si@PI (455 mAh g −1 ) highlighting the efficiency of the CTC structures formed during the thermal treatment. We suggest that the thermal treatment of Si@PI electrodes at optimal conditions can significantly affect the Li-ion insertion/extraction cycling performance of silicon nanoparticles.
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Chem
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2023
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IF 23.5
Pei Li,Xinliang Li,Ying Guo,Ao Chen,Rong Zhang,Yue Hou,Qi Xiong,Yanbo Wang,Ze Chen,Jiaxiong Zhu,Minshen Zhu,Chunyi Zhi
Anionic redox reactions would achieve a higher capacity than typical transition-metal-oxide cathodes, offering low-cost chemistry for advanced lithium-ion batteries. Li-Cl 2 chemistry using anionic redox reactions of Cl 0/−1 shows superior operation voltage (∼3.8 V) and capacity (756 mAh g −1 ). However, a redox-active and reversible chlorine cathode has not been developed in organic electrolyte-based lithium-ion batteries. Chlorine ions bonded by ionic bonding hardly dissolve in organic electrolytes, imposing a thermodynamic barrier for redox reactions. Meanwhile, chlorine gas is easily formed during oxidation. Herein, we report an interhalogen compound, iodine trichloride (ICl 3 ), as the cathode to address these two issues. In situ and ex situ spectroscopy data and calculations reveal that reduced Cl − ions are partially dissolved in the electrolyte, and oxidized Cl 0 is anchored by forming interhalogen bonds. A reversible Li-Cl 2 delivers a specific capacity of 302 mAh g −1 at 425 mA g −1 and a 73.8% capacity retention at 1,250 mA g −1 .
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Lingtao Fang,Chi Zhang,Wenjiao Ge,Mingming Rong,Fan Chen,Zijian Chen,Xiaohui Wang,Zijian Zheng,Qiyao Huang
Tough conductive eutectogel fibers synthesized based on deep eutectic solvents (DESs) have attracted increasing attention in fields of flexible/stretchable electronics, due to their promising stretchability, mechanical strength, conductivity, and relatively inexpensive cost. However, it is still challenging to fabricate such high-performance eutectogel fibers in a simple and versatile strategy. Here, we report a facile spinning of tough conductive eutectogel fibers based on one-pot photopolymerization and Li + -induced toughening effect. This photopolymerization allows the formation of eutectogel into a long fiber format within seconds. The introduction of Li salt into the DESs can regulate the hydrogen bonding interactions, which can significantly promote the construction of a dense interchain hydrogen-bonding network in the eutectogel. Consequently, the spun eutectogel fibers exhibit outstanding Young’s modulus (103.8 MPa), high toughness (38 MJ/m 3 ), promising stretchability (>300 %), conductivity (6 × 10 -3 S/m), and good thermal stability at high temperature. The mechanical properties of the resultant eutectogel fibers can also be modulated by varying the DESs constituents. We demonstrate the multifunction of the fibers in shape-memory behavior, strain sensing, and recyclability. This facile spinning strategy offers a promising way to develop super-strong and conductive gel fibers as smart materials for diverse flexible and wearable device applications.
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Small Methods
·
2023
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IF 12.4
Qi Tang,Yongbin Wang,Ningjun Chen,Ben Pu,Yue Qing,Mingzhe Zhang,Jia Bai,Yi Yang,Jin Cui,Yan Liu,Bin Zhou,Weiqing Yang
Nb 4 C 3 T x MXene has shown extraordinary promise for various applications owing to its unique physicochemical properties. However, it can only be synthesized by the traditional HF-based etching method, which uses large amounts of hazardous HF and requires a long etching time (> 96 h), thus limiting its practical application. Here, an ultra-efficient and environmental-friendly H 2 O-assisted supercritical etching method is proposed for the preparation of Nb 4 C 3 T x MXene. Benefiting from the synergetic effect between supercritical CO 2 (SPC-CO 2 ) and subcritical H 2 O （SBC-H 2 O）, the etching time for Nb 4 C 3 T x MXene can be dramatically shortened to 1 h. The as-synthesized Nb 4 C 3 T x MXene possesses uniform accordion-like morphology and large interlayer spacing. When used as anode for Li-ion battery, the Nb 4 C 3 T x MXene delivers a high reversible specific capacity of 430 mAh g −1 at 0.1 A g −1 , which is among the highest values achieved in pure-MXene-based anodes. The superior lithium storage performance of the Nb 4 C 3 T x MXene can be ascribed to its high conductivity, fast Li + diffusion kinetics and good structural stability.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Yiqing Lu,Zhimin Zou,Yu Bai,Chunhai Jiang
Although SiO/G (G denotes graphite) products are commercially available in nowadays, their scalable applications in Li-ion batteries are still limited by their poor stability and high cost. Herein, niobium oxide (Nb 2 O 5 ) with open tunnel structure is composited with SiO in combination with N-doped carbon (NC) coating, which have jointly enhanced the rate and cycle performance of the resulting SiO@Nb 2 O 5 @NC composite anodes. Under optimum conditions, a capacity retention of 74% is preserved after 200 cycles at 0.2 A g −1 , together with a high capacity of 666 mA h g −1 at 3 A g −1 . Ex situ XRD analysis reveals that Nb 2 O 5 is transformed to amorphous Li x Nb 2 O 5 and electrochemical-inert NbO in the first lithiation process. The former exhibits fast Li + migration rate and capacitive Li ion storage behavior, which may help to improve the electrochemical performance of SiO. Further mixing the SiO@Nb 2 O 5 @NC composite with spent graphite extracted from used LiFePO 4 battery yields a high capacity and stable anode material that shows a high capacity retention of 79% after 500 cycles at 0.4 A g −1 . This work may shed a light on the development of stable yet low cost SiO/G anode materials through pre-modification of SiO with Nb 2 O 5 and utilization of cheap graphite resource.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Hui Chen,Yu-Xiang Xie,Shi-Shi Liu,Hao Peng,Wei-Chen Zheng,Peng Dai,Yi-Xin Huang,MiaoLan Sun,MengWei Lin,Ling Huang,Shi-Gang Sun
Lithium (Li) metal anodes have become an important component of the next generation of high energy density batteries. However, the Li metal anode still has problems such as Li dendrite growth and unstable solid electrolyte interface layer. Herein, we present a functional electrolyte additive (PANHF) successfully synthesized from acrylonitrile and hexafluorobutyl methacrylate via a polymerization reaction. With extensive analytical characterization, it is found that the PANHF can improve the reversibility and Coulombic efficiency of the Li deposition/dissolution reaction and prevent the growth of Li dendrites by forming a solid electrolyte interphase rich in organic matter on the outer layer and LiF on the inner layer. The results show that the cycling performance of the Li/Li cell was greatly improved in the electrolyte containing 0.5 wt % PANHF. Specifically, the cycling stability of more than 700 cycles was achieved at a current density of 1.0 mA cm–2. Moreover, the Li/NCM811 cell with 0.5 wt % PANHF has a higher capacity of 137.7 mA h g–1 at 1.0 C and a capacity retention of 83.41% after 200 cycles. This work highlights the importance of protecting the Li metal anode with functional bipolymer additives for next-generation Li metal batteries.
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高影响因子
Journal of Energy Chemistry
·
2023
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IF 13.1
Fang Yan,Yan Liu,Yuan Li,Yan Wang,Zicen Deng,Meng Li,Zhenwei Zhu,Aohan Zhou,Ting Li,Jingyi Qiu,Gaoping Cao,Shaobo Huang,Biyan Wang,Hao Zhang
To achieve high energy density in lithium batteries, the construction of lithium-ion/metal hybrid anodes is a promising strategy. In particular, because of the anisotropy of graphite, hybrid anode formed by graphite/Li metal has low transport kinetics and is easy to causes the growth of lithium dendrites and accumulation of dead Li, which seriously affects the cycle life of batteries and even causes safety problems. Here, by comparing graphite with two types of hard carbon, it was found that hybrid anode formed by hard carbon and lithium metal, possessing more disordered mesoporous structure and lithophilic groups, presents better performance. Results indicate that the mesoporous structure provides abundant active site and storage space for dead lithium. With the synergistic effect of this structure and lithophilic functional groups (–COOH), the reversibility of hard carbon/lithium metal hybrid anode is maintained, promoting uniform deposition of lithium metal and alleviating formation of lithium dendrites. The hybrid anode maintains a 99.5% Coulombic efficiency (CE) after 260 cycles at a specific capacity of 500 mAh/g. This work provides new insights into the hybrid anodes formed by carbon-based materials and lithium metal with high specific energy and fast charging ability.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Caixiang Zhao,Junfeng Shu,Jiaqi Fang,Shuangxia Luo,Yanjun Guo,Peng Xu,Ji Feng,Meng He,Zhan’ao Tan,Xiong Yin,Leyu Wang
Titania nanospheres have been utilized as building blocks of electron transporting layers (ETLs) for mesoscopic perovskite solar cells (PSCs). Nevertheless, the power conversion efficiencies (PCEs) reported so far for the mesoscopic PSCs containing titania nanospheres are generally lower than those of the state-of-the-art planar PSCs. Here, we have prepared Li-doped hollow titania nanospheres (Li-HTS) through a “cation-exchange” approach and used them for the first time to modify the SnO2 ETL/perovskite interfaces of planar PSCs. The Li-HTS-modified PSC delivered a PCE of 23.28% with a fill factor (FF) of over 80%, which is significantly higher than the PCE of the control device (20.51%). This is the best PCE achieved for PSCs containing titania nanospheres. Moreover, interfacial modification using Li-HTS greatly improves the stability of the PSCs. This work demonstrates the potential of interface modification using inorganic nanostructures for enhancing the efficiency and stability of planar PSCs.
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高影响因子
Small
·
2023
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IF 13.3
Ling Lv,Haikuo Zhang,Jinze Wang,Di Lu,Shuoqing Zhang,Ruhong Li,Tao Deng,Lixin Chen,Xiulin Fan
The utilization of layered oxides as cathode materials has significantly contributed to the advancement of the lithium-ion batteries (LIBs) with high energy density and reliability. However, the structural and interfacial instability triggered by side reactions when charged to high voltage has plagued their practical applications. Here, this work reports a novel multifunctional additive, id est , 7-Anilino-3-diethylamino-6-methyl fluoran (ADMF), which exhibits unique characteristics such as preferential adsorption, oxygen scavenging, and electropolymerization protection for high-voltage cathodes. The ADMF demonstrates the capability to ameliorate the growth of cathode-electrolyte interphase (CEI), effectively diminishing the dissolution of transition metal (TM) ions, reducing the interface impedance, and facilitating the Li + transport. As a result, ADMF additive with side reaction-blocking ability significantly enhances the cycling stability of MCMB||NCM811 full-cells at 4.4 V and MCMB||LCO full-cells at 4.55 V, as evidenced by the 80% retention over 600 cycles and 87% retention after 750 cycles, respectively. These findings highlight the potential of the additive design strategy to modulate the CEI chemistry, representing a new paradigm with profound implications for the development of next-generation high-voltage LIBs.
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高影响因子
Journal of Cleaner Production
·
2023
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IF 11.1
Hui Yang,Shuang Shao,Baozhong Ma,Yingwei Lv,Yongqiang Chen,Chengyan Wang
With the increasingly essential role of Li in new energy industry, Li extraction from ore has attracted active attention. In the prior study, a process combined thermal activation and alkali leaching was proposed to extract Li from Li concentrate. Previous research found that Li was precipitated as Li 2 SiO 3 and entered into the leach residue at the leaching temperature exceeded 100 °C. Drawing inspiration from this phenomenon, hydrothermal precipitation of Li as intermediate product Li 2 SiO 3 from the alkali leach liquor of Li concentrate was proposed. Firstly, the E–pH diagrams of Li–Si–H 2 O system were plotted to analyze the feasibility of hydrothermal precipitation Li. And the corresponding operation window was established. Subsequently, the effect of factors including Li/Si ratio, hydrothermal temperature and time, Li and NaOH concentrations on the migration behaviors of Li and Si were explored using the simulated leach liquor. The experimental results were in good consistence with the thermodynamic analysis. Ultimately, the leach liquor was used to precipitate Li at the determined optimal conditions, and the Li precipitation efficiency reached 91.0%. This study provided an innovative strategy for separating Li from the alkali leach liquor of Li concentrate without adding any reagents. An economical and sustainable route for synergistic extraction of Li, Rb, and Cs from Li concentrate was also proposed.
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