IONICS
·
2018
·Vol. 25
·期 4
·1669-1677
·
IF 2.347
Yuan Jiashu,Liu Zhihao,Wen Yandi,Hu Huili,Zhu Yongming,Thangadurai Venkataraman
Li–oxygen battery provides much higher specific energy density compared to conventional Li–ion batteries, but there is a lack of desired cathodes which show lower over-potential during the charging cycle. Here, we report the effect of surface morphology of carbon-free spinel-like NiCo 2 O 4 nanowires and nanosheets on Ni foam on cathode performance in Li–O 2 battery. Two hierarchical structured NiCo 2 O 4 cathodes were synthesized by using a hydrothermal method. Physical, chemical, and electrochemical properties of NiCo 2 O 4 were characterized using powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, BET surface area, electrochemical AC impedance spectroscopy, and linear sweep voltammetry. Scale-like NiCo 2 O 4 electrode showed the highest specific capacity, compared to that of rod-like morphology, which seems due to a superior catalytic activity for oxygen reduction reaction, with lower charging over-potential, high discharge capacity, and excellent cycle performance.
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高影响因子
SOLID STATE IONICS
·
2013
·
IF 2.046
Alexandre Dumon,Mian Huang,Yang Shen,Ce-Wen Nan
Strontium doped lithium ion garnets Li 7 La 3 Zr 2 O 12 (LLZ) with 0.9 wt% to 8.4 wt% content of added Sr were synthesized via conventional solid-state reaction. X-ray diffraction patterns confirmed the cubic garnet structure of the sintered samples. A small amount of strontium was substituted to lanthanum in LLZ lattice. Further analysis showed SrCO 3 acted as a sintering aid for cubic LLZ ceramics and significantly increased the grain size of the sintered pellets. A conductivity of 2.10 × 10 − 4 S/cm at 297 K was obtained for the undoped LLZ. The total ionic conductivity reached a maximum of about 5 × 10 − 4 S/cm at 297 K with an activation energy of about 0.31 eV for 1.7 wt% Sr added LLZ sintered for 20–24 h in alumina crucible.
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高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Jinyin Cheng,Haochang Zhang,Zhixin Wang,Yaqing Zhou,Kangzhe Yu,Yan Cheng,Zhaozhe Yu,Xiao Huang,Bingbing Tian
Emerging halide superionic conductors with remarkable oxidative stability and deformability , making them a potential game-changer for high-performance all-solid-state Li batteries (ASSLBs). The recently reported Li 2 ZrCl 6 (LZC) with low cost possess great potential. However, its ionic conductivity at 25 °C is below 1 mS cm −1 . Herein, we developed a Li-richened strategy to LZC by doping O 2− at Cl − site via a mechanochemical method to form oxychloride electrolytes Li 2+ x ZrCl 6− x O x (0 ≤ x ≤ 1.8), resulting in high ionic conductivity up to 1.46 mS cm −1 at room temperature (RT). The experimental results and theoretical calculations (ab initio molecular dynamics simulations) demonstrate that the Li 2 O doping leading to a Li-richened LZC lattice effectively enhances the Li + conductivity in solid-state electrolytes (SSEs). Significantly, an increasing O 2− substitution in the Li 2+ x ZrCl 6− x O x microcrystalline framework induces a progressive structural evolution from triangular to monoclinic phases, accompanied by a redistribution of Li + . Furthermore, the ASSLBs formed by Li 3.4 ZrCl 4.6 O 1.4 (LZCO) with Li-In anode and bare LiCoO 2 cathode shows excellent long-term cycling stability (94 % capacity retention for 600 cycles at 1 C) and high-rate performance (105.7 mAh g −1 at 2 C). This exploratory study provides a promising strategy to facilitate the application of low-cost LZC-based SSEs for high-performance ASSLBs.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yanna Wu,Mengmeng Jia,Shuming Li,Zong Lu,Yanying Wei,Haihui Wang
Lithium extraction from salt lake is important for carbon neutrality, while obtaining both high Li + /Mg 2+ selectivity and high water permeance is still challenging. The burgeoning two-dimensional (2D) material membranes in decade show enormous potential to solve above problem due to its highly designable lamellar structure. In this work, a kind of positively charged laminated membranes using MXene nanosheets as building blocks with decoration of poly (diallyl dimethyl ammonium chloride) (PDDA) were proposed. Benefiting from the well–intercalated PDDA between MXene nanosheets, the interlayer spacing between neighboring nanosheets was greater than 2 nm, which was conductive to enhance water permeance. Simultaneously, the introduction of PDDA endowed the membrane with positive charge, which exhibited sharply improved Li + /Mg 2+ selectivity by an order of magnitude due to enhanced Donnan effect. The prepared MXene/PDDA membrane with a modification mass ratio of 1:10 exhibited high Li + /Mg 2+ selectivity of 29.3 with MgCl 2 saline solution permeance of 9.8 L m −2 h −1 ·bar −1 and pure water permeance of 32.3 L m −2 h −1 ·bar −1 , which was promising for lithium extraction. Such membrane constructing concept could be expanded to other kinds of membranes based on 2D nanosheets for effective ion sieving.
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高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 4
·286
·
IF 21.8
Mao Gaoqiang,Lu Jingfan,Cai Haiyan,Yu Wanjing,Tong Hui,Guo Xueyi,Zeng Leiying,Jiang Long
Increasing the operating voltage can significantly increase the energy density of LiCoO 2 , but it is accompanied by severe structural damage and interface degradation. Especially at a high voltage above 4.5 V, LiCoO 2 faces severe challenges, such as irreversible phase transition, lattice oxygen loss, and electrode–electrolyte interface evolution. Herein, a high-voltage LiCoO 2 cathode material with bulk doping and surface coating synergistic modification was designed and prepared. The doped Mg 2+ ions entered the lithium layers as pillars, stabilizing the layered framework. Meanwhile, Li 1.3 La 0.3 Ti 1.7 (PO 4 ) 3 was uniformly coated on the surface of LiCoO 2 , which is beneficial for suppressing Co 3+/2+ ion leaching and interface side reactions during cycling. Furthermore, Li 1.3 La 0.3 Ti 1.7 (PO 4 ) 3 is a fast ion conductor, which facilitates the rapid transport of lithium ions on the surface of the cathode material. Owing to the synergistic effect of Mg 2+ ion doping and Li 1.3 La 0.3 Ti 1.7 (PO 4 ) 3 coating, the orbitals of Co 3d and O 2p in LiCoO 2 crystal are changed, and the irreversible phase transition and oxygen loss are inhibited. The modified material exhibited an excellent electrochemical performance. A discharge capacity of 175.5 mAh·g −1 at 10 C rate, as well as a capacity retention of 90.14% after 200 cycles at 1 C rate, was achieved in the modified material. This work supplies a new method for developing high-voltage oxide cathodes through bulk and interfacial modification.
研究领域:
材料科学
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电化学
·
储能技术
·
锂离子电池
·
正极材料
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高影响因子
Energy & Environmental Science
·
2025
·Vol. 18
·期 9
·4362-4372
·
IF 30.8
Shengyao Luo,Mengqi Wu,Said Amzil,Tonghui Xu,Qing Ming,Lei Zhang,Jie Gao,Shuang Tian,Donghai Wang,Yisen Qian,Ya-Jun Cheng,Yonggao Xia
The combination of high-nickel cathodes with lithium metal anodes is widely considered a promising solution to alleviate range anxiety. However, challenges such as limited fast-charging capacity and rapid degradation persist when using carbonate-based electrolytes. While many researchers predominantly focus on solvation structures, we have strategically tailored the electrolyte formulation by employing isopropyl acetate as the primary solvent, evidenced by interfacial interactions. Compared to n-propyl acetate, isopropyl acetate reduced the interaction with the electrode surface, promoted tighter adsorption of the electrolyte ion network within the inner Helmholtz layer, and ultimately enhanced the dynamic stability of the lithium metal interface. In Li‖NCM811 cells, this electrolyte demonstrates a 4.5 V cutoff and sustains 88.6% capacity retention over 200 cycles at a high rate of 15C. Additionally, this electrolyte demonstrates stable cycling performance at elevated rates of 1C and 5C at temperatures of 60 °C and −20 °C, respectively, while maintaining stability even at a rate of 10C under poor electrolyte conditions with thin lithium layers, indicating significant application potential. These studies reveal that the electrolyte distribution at the electrode interface affects the electrochemical process and the formation of the electrode–electrolyte interphase significantly, offering new ideas for future electrolyte research and design.
研究领域:
电化学
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储能技术
·
材料科学
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电池技术
·
化学工程
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高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 46
·24579-24589
·
IF 11.301
Yongkang Han,Jinmei Xu,Wei Wang,Fu Long,Qunting Qu,Yan Wang,Honghe Zheng
Interfacial modification is one of the most important technologies to improve the overall electrochemical properties of Ni-rich cathodes. Herein, a novel strategy of in situ planting of an electrolyte film-forming additive on a single crystal NCM811 surface is proposed by consuming the residual lithium to develop a functional Al(Li)BOB nano-layer. Different from traditional physical coating, this approach cleverly consumed the undesirable residual lithium on the NCM811 surface. The in situ grown 30–50 nm Al(Li)BOB layer on the single crystal NCM811 cathode surface contributes to its much enhanced electrochemical performances. At a high operating voltage (charge voltage limit of 4.5 V vs. Li/Li+), the capacity retention is greatly increased from 57.0% to 83.5% after 295 cycles. Meanwhile, the incorporation of aluminum is effective in improving the thermal stability of the Ni-rich cathode. The novel interfacial strategy by in situ implanting of an electrolyte additive is of important significance for solving the critical interfacial issue for Ni-rich cathode materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
锂离子电池
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界面工程
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纳米材料
·
固态化学
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高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Lei Ding,Dandan Li,Sihang Zhang,Zhaoyang Wang,Pengfang Zhang,Fanghui Du,Shuyue Zhao,Daoxin Zhang,Feng Yang,Shuo Zhang
Lithium-sulfur (Li-S) batteries with attractive capacity give remarkable potential for prospective high-capacity application scenarios but suffer a fatal flaw of short cyclability before large-scale commercialization especially owing to polysulfide (Li 2 S n ) transmembrane shuttling. To efficiently restrain chronic Li 2 S n shuttle and expedite Li + transfer, herein, a novel electriferous charge-mosaic S(TMC@Lys-Li) separator preparation approach is recommended. Interfacial polymerizations of lithiated lysine and trimesoyl chloride establish an electriferous charge-mosaic polyamide functional layer. Substituted Li within the charge-mosaic layer offers transition or replacement sites for smoothing Li + migrations, which constructs efficient Li + fast-transfer private channels and accelerates the Li + transfer rate to 9.4 times. Negatively charged polyamide skeleton synchronously heightens Li 2 S n rejections by combining Donnan and steric effects. S(TMC@Lys-Li) replenishes Li for homogenizing Li nucleation and growth, endowing stable plating/stripping behaviors over 250 cycles for Li-Cu batteries. Assembled Li-S cells thus exhibit excellent specific capacity and cyclability at multiple application scenarios such as long periods, high areal capacity, and fast charge, holding 78.1% retention after 500 cycles at 1 C. The superior thermal stability and self-discharge of S(TMC@Lys-Li) dramatically strengthen battery thermal runaway resistance even at 155 ℃, which ensures security for Li-S battery high-power and high-temperature operations. Above alluring features enable charge-mosaic separators to be potentially adopted in practical Li-S batteries demanding strict security, high-capacity density, and fast charge technology.
研究领域:
材料科学
·
能源存储技术
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Junyuan Hua,Jintao He,Hongchang Pei,Jiahui Du,Xiaohua Ma,Jianxin Li
The high similarity in chemical properties between Li + and Mg 2+ poses a substantial challenge for their selective separation from salt lake brine with high Mg-Li (m/m) ratios. Herein, a highly efficient solvent extraction system was reported for Li + /Mg 2+ selective separation, with tributyl phosphate (TBP) and di(aminobenzo)-14-crown-4 (CE) as extractants, [C 4 mim][NTf 2 ] (IL) as co-extractant, and methylene chloride as a diluent. Simulated brines included 0.01 M LiCl and 0.01 and 0.2 M MgCl 2 with Mg/Li mass ratios of 3.5 and 70, respectively. Molecular dynamics (MD), density functional theory (DFT), and 1 H NMR analysis were employed to reveal the hydrogen bond interaction and compatibility between CE, TBP, and IL. Under the optimal extraction conditions containing a concentration of 20 mg/mL CE and 0.61 mmol/mL IL, the maximum single-stage Li + extraction rate of the TBP-CE-IL extraction system with Mg/Li mass ratios of 3.5 and 70 were 89.5 and 81.8 %, and the separation factor of Li to Mg were up to 515 and 422. Compared with the TBP-IL extraction system, the addition of CE effectively improved the extraction rate of Li + and the selectivity of Mg-Li, which was due to the hydrogen bond interaction between CE and TBP/IL and the cavity size effect between CE and Li + , improving CE coordination and endowing the complex generated in the organic phase with greater stability. The possible structure of the complex in the organic phase was determined to be 2TBP·Li·NTf 2 -CE·Li·NTf 2 through Li + extraction dynamic analysis. In summary, this work provides an efficient separation technology for Li + extraction from salt lake brine.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Peiyu Hou,Maosheng Gong,Yuhang Tian,Feng Li
Elevating the nickel (Ni) content within layered cathodes constitutes a straightforward and effective approach to enhance the energy density of lithium-ion batteries (LIBs). However, the phase transition from H2 to H3 introduces substantial alterations in lattice volume, leading to structural degradation and diminished electrochemical performance . This study employs density functional theory (DFT) calculations to determine that the formation energy for Nb 5+ occupied at Li 3 b sites is lower compared to that of Ni 3 a and Co 3 a sites, yet higher than that of Mn 3 a sites. This suggests a preference for Nb 5+ doping within the Li layer of Mn-free cathodes. Motivated by these DFT results, we show the viability of high-valence Nb 5+ as a stable pillar in the compositionally optimized binary oxide LiNi 0.9 Co 0.1 O 2 . The inclusion of this Nb 5+ pillar in the Li layer of Ni/Co-based oxide significantly enhances the reversibility of the H2–H3 redox couple and mitigates microcrack formation in polycrystalline cathodes. As a result, the Nb-doped Ni/Co-based cathode exhibits an extended cycling lifespan, elevated rate capability, and increased thermal stability compared to the undoped. This investigation achieves precise control over doping sites by optimizing the chemical composition of Ni-rich cathodes and provides novel insights into advancing their electrochemical performance for high-energy LIBs.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Zhen Zeng,Shang Wang,Jun Cheng,Guangmei Hou,Deping Li,Guifang Han,Lijie Ci
Solid polymer electrolytes (SPEs) are preferable in the pursuit for developing high-energy Li metal batteries due to their inherent flexibility and intimate contact with electrodes. However, continuous interfacial parasitic reactions and undesired Li dendrite growth caused by inhomogeneous plating/stripping of Li+ result in rapid deterioration of an SPE/Li interface. Herein, a novel Zn2+-containing SPE (SPE-xZn) with anionic groups partially tethered on the polymer chains is developed to meet these challenges. During cycling, Zn2+ cations inside the SPE-xZn will gradually migrate to the surface of a Li electrode and then evolve to a Li-Zn alloy layer, where Li+ can diffuse more efficiently. Meanwhile, owing to the electrostatic interaction, the immobilized anionic groups within SPE-xZn can alleviate local concentrated Li+ flux. The synergistic effects of an in situ formed alloy layer and unique macromolecular structure can promote uniform plating/stripping of Li, thus yielding a more stable SPE-xZn/Li interface. Therefore, steady cycling over 300 h at 0.2 mA cm–2 is achieved by Li/SPE-5Zn/Li, and an impressive capacity retention of 87.3% at 0.5 C after 800 cycles is realized by LFP/SPE-5Zn/Li with an average Coulombic efficiency of 99.90%.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Yanchun Yang,Lijian Huang,Daocheng Pan
In our recent report (ACS Appl. Mater. Interfaces2016, 8, 5308), Li+ ions had been successfully incorporated into the lattice of the selenized Cu2ZnSn(S,Se)4 thin film on a quartz substrate by substituting equivalent Cu+ ions, and Li+ ions was also found to have the little effect on the crystal growth and defect passivation. To further improve the cell performance of Li-doped CZTSSe devices, we conducted the same experiments on the sodium-rich soda-lime glass (SLG) substrate in this study, instead of sodium-free quartz substrate. Surprisingly, only trace amounts of Li (Li/Cu molar ratio ∼1 × 10–4) were detected in the final CZTSSe thin films; meanwhile, a large amount of sodium was present on the surface and at the grain boundaries of the selenized thin films. A Li/Na exchange mechanism is used to explain this phenomenon. Only on the sodium-free substrate can Li+ ions enter the CZTSSe host lattice, and doping Li+ ions on the SLG substrate are nearly identical to doping Na+ ions.
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高影响因子
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