JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 9
·090520
·
IF 3.721
Huiying Liang,Xiaoxi Zuo,Lengdan Zhang,Wenda Huang,Qiuyu Chen,Tianming Zhu,Jiansheng Liu,Junmin Nan
Developing a nonflammable electrolyte is an efficient strategy to eliminate fire hazards and improve battery safety. Electrolytes containing nonflammable phosphate solvents enhance battery safety to a certain extent, but their compatibility with electrodes remains an obstacle. Here, a nonflammable electrolyte based on carbonate solvent is designed to resolve this dilemma while guaranteeing battery performance. We demonstrate that a nonflammable electrolyte employing the popular film-forming solvent ethylene carbonate (EC) and 1,2-dimethoxyethane (DME) with 2.3 mol kg−1 lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) has excellent thermal stability owing to the unique solution molecule structure. What's more, the nonflammable electrolyte possesses excellent compatibility with both LiNi0.6Co0.2Mn0.2O2 and graphite electrode. The initial specific capacity and capacity retention rate of graphite/LiNi0.6Co0.2Mn0.2O2 punch cells employing this electrolyte are 169.3 mAh g−1 and 98.7% (after 50 cycles), respectively, which are comparable to those of cells employing traditional carbonate electrolytes. Besides, short-circuit test of the pouch cell suggests that the release of gases accompanied by decomposition of electrolyte under abuse conditions is effectively suppressed. All of these results show a promising prospect of this nonflammable electrolyte for application in high-safety Li-ion batteries.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2022
·Vol. 77
·期 7
·715-722
·
IF 1.712
Jinghao Zhuang,Wenlin Feng,Bo Zhou,Qili Zhang,Chong Liu,Yao Gong
A series of CaSr(WO 4 ) 2 : Eu 3+ and CaSr(WO 4 ) 2 : Eu 3+ , Li + phosphors with different Eu 3+ or Eu 3+ /Li + molar contents were successfully synthesized by high-temperature solid-state reaction. Through a series of characterization methods, the composition, structure and luminescence characteristics of the sample are obtained. Upon excitation at 393 nm, the strong red light corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ can be observed. The effect of Li + charge compensation on the photoluminescence of the sample is studied. The strongest red emission is obtained through 1% Eu 3+ and 1% Li + doping. All of the results indicate that Li + charge compensation can effectively enhance the red emissions intensity of Eu 3+ -doped CaSr(WO 4 ) 2 phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Xi Zheng,Ying Liao,Zhongru Zhang,Jianping Zhu,Fucheng Ren,Huajin He,Yuxuan Xiang,Yezhen Zheng,Y. Yang
Ethyl-(2,2,2-trifluoroethyl) carbonate (ETFEC) is investigated as a solvent component in high-voltage electrolytes for LiNi 0.5 Mn 1.5 O 4 (LNMO). Our results show that the self-discharge behavior and the high temperature cycle performance can be significantly improved by the addition of 10% ETFEC into the normal carbonate electrolytes, e.g., the capacity retention improved from 65.3% to 77.1% after 200 cycles at 60 °C. The main reason can be ascribed to the high stability of ETFEC which prevents large oxidation of the electrolyte on the cathode surface . In addition, we also explore the feasibility of electrolytes using single fluoriated-solvents with and without additives. Our results show that the cycle performance of LNMO material can be greatly improved in 1 M LiPF 6 + pure ETFEC-solvent system with 2 wt% ethylene carbonate (EC) or ethylene sulfate (DTD). The capacity retention of the LNMO materials is 93% after 300 cycles, even better than that of carbonate-based electrolytes. It is shown that the additives are oxidized on the surface of LNMO particles and contribute to the formation of cathode/electrolyte interphase (CEI) films. This composite CEI film plays a crucial role in suppressing the serious decomposition of the electrolyte at high voltage.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shuting Li,Manting Li,Limin Chen,Jianying Yang,Zhao Wang,Fan Yang,Linhong He,Xinchun Li
Artificial nanochannels have seen great progress in energy storage, molecular filters, nanofluidic diodes, and biosensors. Precisely recognizing and transporting molecules or ions underpin the basis of artificial nanochannels. Here, we report highly efficient Li + responsive nanochannels by design of functionalized porous anodic aluminum oxide (AAO) membranes. The 12-crown-4 unit was tethered to the synthesized spiropyran molecule, creating a smart Li + responsive element, photochromic crowned spiropyran (CE-SP). The crown unit can specifically bind with Li + while exempting the harassment of other metallic cations; and importantly, the spiropyran moiety possesses reversible photochemistry response, adding the flexibility to regulate ion transport behaviors. Upon the ultraviolet light stimulus, hydrophobic CE-SP molecules transform to positively charged crowned merocyanine (CE-MC), which can further convert to oxygen-negative ions in weak alkaline environment, thereby forming O - -Li + interaction. Such structural evolutions enable to deftly tune the surface charge and wettability of the nanochannels, and thus ingeniously manipulate Li + recognition profiled by ionic current signal. Moreover, electrically-driven release of the captured Li + can be realized in an amiable condition, showing controllable capture-to-release ability. Finite element simulation unveils the fundamental mechanisms of ion transport pertaining to Li + recognition events in the nanoconfinement. This work thus paves a way to construct high-performance Li + -selective nanodevice, and holds promise for Li + -related electrochemistry energy research.
研究领域:
材料科学
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纳米技术
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电化学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 30
·13065-13071
·
IF 7.79
Kun Wang,Yongyuan Hu,Jian Pei,Fengyang Jing,Zhongzheng Qin,Huabin Kong,Jinli Wang,Yumin Zhou,Gang Chen
High-capacity Co2VO4 has become a potential anode material for lithium-ion batteries (LIBs), benefiting from its lower output voltage during cycling than other cobalt vanadates. However, the application of this new conversion-type electrode is still hampered by its inherent large volume variation and poor kinetics. Here, a 2D–2D heterostructure building strategy has been developed to enhance the electrode performance of Co2VO4 through construction of Co/Co2VO4 nanocomposites converted from the in situ phase separation of Co2V2O7·3.3H2O nanosheets. Co/Co2VO4 based on face-to-face contact exhibits the optimized stacking configuration, where Co nanocrystals give gaps of several nanometers between stacked Co2VO4 nanosheets, enabling full contact with the electrolyte, a shorter transport path of lithium ions and more reactive sites. With this design, Co/Co2VO4 anodes deliver outstanding reversible capacity (750 mA h g−1 at 1 A g−1) with ultrahigh capacity retention rate, and excellent cycle stability at high rate (520 mA h g−1 at 5 A g−1 retained after 400 cycles). An “active center's charge transfer—capacity compensation” model was proposed based on capacity analysis, XPS depth analysis and HRTEM observation to uncover the fundamental reason of the excellent cycle performance. This in situ 2D–2D heterostructure constructing strategy may open up the possibility for designing high-performance LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 21
·e202201473
·
IF 9.14
Rundong Fan,Yizeng Wu,Haipeng Xie,Yongli Gao,Lina Wang,Bo Zhao,Dong Li,Shaocheng Liu,Yu Zhang,Hua Kong,Yujing Li,Qi Chen,Anyuan Cao,Huanping Zhou
Graphical Hybrid theory : A hybrid perovskite material, 4,4’-ethylenedipyridinium lead bromide, is assembled onto carbon material to function as photoelectrode of the Li-oxygen battery, leading to a reduced overpotential of 0.5 V compared to the Li-oxygen battery without illumination (1.3 V). The overpotential can be maintained lower than 0.9 V after cycling for 170 h. Organic-inorganic hybrid perovskites have emerged in the last decade as promising semiconductors due to the excellent optoelectronic properties. This kind of perovskites exhibited respectable photocatalytic activities toward potential application in battery; however, the instability issue still hindered their practical use. Herein, a hybrid perovskite material, 4,4’-ethylenedipyridinium lead bromide [(4,4’-EDP)Pb 2 Br 6 ], was assembled onto the carbon materials to function as photoelectrode of the Li-oxygen battery. The strong cation-π interactions between the A-site cations enabled this hybrid perovskite to endure the cycling process as well as the exposure to battery electrolyte and oxygen. Benefitting from the photo-generated carriers of the photoelectrode under illumination, the formation/decomposition of the discharge product was accelerated, thus leading to a reduced overpotential from 1.3 V to an optimized 0.5 V compared to the Li-oxygen battery without illumination. The overpotential could be maintained lower than 0.9 V after cycling for 170 h. Furthermore, when exposed to the sunlight, the charging voltage was reduced by over 0.2 V. The intrinsic stability and strong light absorption of perovskites together with the optimized perovskite/carbon cathode interfaces contributed to the improved performance under different light sources without complex material design, which shed light on the exploration of organic-inorganic hybrid perovskites in Li-oxygen battery applications.
研究领域:
能源存储
·
材料科学
·
光化学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Chenglin Wei,Mengdi Sun,Baoguo Zhang,Zhangyong Yan,Zihao Dang,Yongkang Xu,Lin Wu,Ya Hu
Benefiting from the low cost and natural abundance of sulfur, as well as its excellent theoretical performance metrics - including a capacity of 1675 mAh g −1 and an energy density of 2600 Wh kg −1 - lithium-sulfur (Li-S) batteries have attracted considerable attention for next-generation energy storage. However, their practical deployment is severely hindered by the intrinsic shuttle effect of lithium polysulfides (LiPSs), which leads to the loss of active materials and poor cycling stability. In this work, we report a facile hydrothermal-calcination strategy to synthesize porous nanosheet-structured Fe-doped nickel oxide (Fe-NiO) as a functional separator modifier for Li-S batteries. The polar nature of NiO enables strong chemical interactions with LiPSs, effectively anchoring polysulfides on the cathode side and suppressing the shuttle effect. Furthermore, Fe doping significantly increases the density of surface active sites, thereby enhancing the adsorption and catalytic conversion of LiPSs into insoluble Li 2 S 2 /Li 2 S species, which promotes redox kinetics and mitigates capacity fading. When applied to Li-S cells, the Fe-NiO-modified separator markedly improves the electrochemical performance, delivering a high reversible capacity of 1150 mAh g −1 at 0.2C, an excellent rate capability of 505 mAh g −1 at 5C, and outstanding long-term stability with a minimal capacity decay of 0.091 % per cycle over 500 cycles at 1C. This study presents a simple and scalable strategy for separator engineering, providing a promising pathway toward high-performance Li-S batteries.
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Jiuqing Liu,Lishun Bai,Junying He,Cheng Wang,Qihou Li,Feifei Song,Zikun Hong,Ya Chen,Fanli Zeng,Chen Cheng,Zehao Chen
Lithium–oxygen (Li–O2) batteries, having an ultrahigh theoretical energy density (3500 Wh kg–1), have gained a lot of attention. However, its application is seriously obstructed by pivotal issues like instability of lithium metal anode, low energy efficiency, and electrolyte decomposition. Herein, a separator modification method based on interfacial polymerization (IP) was proposed by us to solve these issues. The obtained interfacial polymerization layer shows good ion-selective permeability on the surface of the polyetherimide (PEI) separator, and the ion transport of the larger EMIM+, TFSI–, and BF4– between the electrodes is greatly inhibited. Consequently, the representative P2-PEI separator presents the best cycle performance and the Li–O2 battery assembled with it can stably operate over 135 cycles, even under a current density of 0.05 mA cm–2 and a limited specific capacity of 1000 mAh g–1.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2016
·Vol. 3
·期 4
·045010
·
IF 0.968
Ting Fan,Jiantao Lü,Futian Lin,Zifan Zhou
Improved red emission in polyvinylpyrrolidone (PVP)-coated hollow LaF3:Eu3+ nanoparticles by introducing Li+ ions was found for the first time via a one-step template-free hydrothermal method. The hollow formation can be attributed to self-recrystallization and a local Ostwald ripening thermodynamic process. Pores were clearly seen and widely distributed in all LaF3 nanoparticles. The introduction of Li+ ions did not introduce new crystalline phases and resulted in little change in size and morphology of the LaF3 nanoparticles. The main diffraction peaks were found to shift slightly with the Li+ doping concentrations, which indicates that Li+ changes the crystal field environment of Eu3+. The excitation and red emission intensity both doubled when codoped with 7 mol% Li+ ions. The widely distributed pores and improved luminescence properties of our nanoparticles facilitated the construction of new nanocomposites for novel biological applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Qian Wu,Yun Yang,Zheng Chen,Qinting Su,Songde Huang,Dakun Song,Caizhen Zhu,Rui Ma,Cuihua Li
Gel electrolytes have attracted great attention due to the high ionic conductivity and superior mechanical strength. However, poor interfacial stability between Li metal and gel electrolytes hinders their practical application. Here, a double polymer network gel electrolyte (DPNGE) is prepared via photopolymerizing branched acrylate on the poly(vinylidene fluoride-co-hexafluoropropylene) matrix to solve this issue. This DPNGE possesses an enhanced ionic conductivity of 9.5 × 10–4 S cm–1 at room temperature and a wide electrochemical stability window up to 5.0 V. The assembled Li/DPNGE/LiFePO4 batteries demonstrated a 153.7 mA h g–1 initial discharge capacity at 0.5 C and keep 92.7% capacity retention after more than 500 cycles. Moreover, a systematic analysis confirms that we construct a stable solid electrolyte interphase layer for homogeneous deposition and a stable cycle. These advantages enable the prepared DPNGE to show great application potential in high-performance lithium metal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xue Ye,Jing Wu,Jianneng Liang,Yipeng Sun,Xiangzhong Ren,Xiaoping Ouyang,Dazhuan Wu,Yongliang Li,Lei Zhang,Jiangtao Hu,Qianling Zhang,Jianhong Liu
Low cycling Coulombic efficiency (CE) and messy Li dendrite growth problems have greatly hindered the development of anode-free Li-metal batteries (AFLBs). Thus, functional electrolytes for uniform lithium deposition and lithium/electrolyte side reaction suppression are desired. Here, we report a locally fluorinated electrolyte (LFE) medium layer surrounding Cu foils to tailor the chemical compositions of the solid-electrolyte interphase (SEI) in AFLBs for inhibiting the immoderate Li dendrite growth and to suppress the interfacial reaction. This LFE consists of highly concentrated LiTFSI dissolved in a fluoroethylene carbonate and/or succinonitrile plastic mixture. The CE of Cu||LiNi0.8Co0.1Mn0.1O2 (NCM811) AFLB increased to a high level of 99% as envisaged, and the cycling ability was also highly improved. These improvements are facilitated by the formation of a uniform, dense, and LiF-rich SEI. LiF possesses high interfacial energy at the LiF/Li interface, resulting in a more uniform Li deposition process as proved by density functional theory (DFT) calculation results. This work provides a simple yet utility tech for the enhancement of future high-energy-density AFLBs.
研究领域:
电化学
·
材料科学
·
电池技术
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122598
·
IF 7.5
Yu Tang,Shengde Dong,Ping Li,Ying Cheng,Wenjie Liu,Chuanjiang Cheng,Yanxia Sun,Qi Xu,Chunxi Hai,Yuan Zhou
Lithium extraction from hypersaline brines is increasingly important for sustainable energy technologies. Nanofiltration membranes leverage synergistic size exclusion and Donnan effects for Mg 2+ /Li⁺ separation under high-salinity conditions. However, a persistent flux-selectivity dilemma remains, because the highly crosslinked and compact polyamide selective layers required for high Mg 2+ rejection often introduce substantial mass-transfer resistance and limit water flux. Here, we develop a methanol swelling followed by thermal curing strategy to regulate the polyamide network architecture. Swelling promotes structural relaxation and pathway opening, whereas post-curing stabilizes the reconfigured network and narrows the pore-size distribution to strengthen size-sieving. The resulting membrane (PEI-TMC-M h ) delivers a permeation flux of 56.65 L·m −2 ·h −1 in 2000 ppm MgCl 2 while maintaining Mg 2+ rejection above 98%. In simulated brine with Mg 2+ /Li + = 50, a separation factor (S Li/Mg ) of 34.03 is achieved. Two-stage nanofiltration of real salt-lake brine (Mg 2+ /Li + mass ratio 55) yields a Li + -enriched solution containing 26.9 mg·L −1 Li + with a reduced Mg 2+ /Li + mass ratio of 0.65. This work provides a simple post-treatment route to improve the flux–selectivity balance for brine-based lithium extraction.
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DOI
高影响因子
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