Advanced Energy Materials
·
2023
·Vol. 14
·期 6
·2303641
·
IF 27.8
Shuhao Wang,Yaqi Liao,Shiya Li,Can Cui,Jianing Liang,Gaofeng Du,Zhaoming Tong,Lixia Yuan,Tianyou Zhai,Huiqiao Li
Reducing the thickness of inorganic solid-state electrolytes (SSEs) can improve both the gravimetric/volumetric energy density due to the decreased weight/thickness of the cells. Unfortunately, the thickness of inorganic SSEs by the powder-pressing method is 500–1000 µm, which brings large internal resistance. In this work, an ultrathin SSE membrane is prepared via a simple solution-infusion method using a ZrO 2 nanowire as the skeleton and Li 3 InCl 6 as the Li-ion conductor. This membrane can be self-standing with a minimum thickness of 25 µm, less than 1/20 in thickness of that electrolyte by the powder-pressing method. Attributed to a high Li 3 InCl 6 loading, the membrane remains a high conductivity. When used as the electrolyte in solid cells, such the membrane can enable a much-reduced resistance compared to the traditional SSE layer. Due to the fact that the electrolyte membrane does not contain any organic components, it exhibits good thermal stability. Benefiting from the soft nature of the halide SSEs, the membrane, without any modification, can close contact with the composite cathode. The LiNi 0.8 Co 0.1 Mn 0.1 O 2 /LiIn cell exhibits a high reversible capacity and the capacity retention is above 80% after 200 cycles.
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Small Methods
·
2023
·
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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Materials Today Chemistry
·
2023
·
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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CHEMICAL ENGINEERING JOURNAL
·
2023
·
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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ACS Applied Materials & Interfaces
·
2023
·
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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Journal of Energy Chemistry
·
2023
·
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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Journal of Energy Storage
·
2023
·
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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APPLIED SURFACE SCIENCE
·
2023
·
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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Chem
·
2023
·
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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ACS Applied Materials & Interfaces
·
2023
·
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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Journal of Energy Chemistry
·
2021
·
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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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Ningning Feng,Bingliang Wang,Zhuo Yu,Yuming Gu,Lili Xu,Jing Ma,Yonggang Wang,Yongyao Xia
Li–CO2 batteries have attracted worldwide attention because of their dual characteristics of high energy density and effective CO2 capture. However, the basic electrochemistry mechanism involved has been unclear, which is mainly confused by the complicated decomposition of organic electrolytes. Herein, water-in-salt (WIS, LiTFSI/H2O 21.0 mol/1 kg) has been explored as a suitable electrolyte for the first time to investigate the reaction mechanism of Li–CO2 batteries with different cathodes (carbon nanotube (CNT) and Mo2C/CNT, respectively). An Mo2C-based Li–CO2 battery with WIS delivers a higher energy efficiency of 83% and a superior cyclability, compared to those of the CNT-based counterpart cell. Through various ex/in situ qualitative/quantitative characterizations, the Mo2C-based Li–CO2 battery with WIS can operate on the reversible conversion of CO2-to-Li2C2O4 ((e–/CO2)ideal = 1) at lower discharge/charge overpotentials, while the CNT-based counterpart cell is based on the formation/decomposition of Li2CO3 ((e–/CO2)ideal ≈ 1.33) at high overpotentials. Such a difference in CO2 reduction products stems from the stronger interaction between Mo2C(101) and Li2C2O4 than that of the CNT and Li2C2O4 based on the density functional theory calculations, resulting in the selective stabilization of the intermediate product Li2C2O4 on the Mo2C surface.
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