ACS Nano
·
2019
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IF 13.903
Qingping Wu,Xuejun Zhou,Jun Xu,Fahai Cao,Chilin Li
How to simultaneously restrain the loss of active species and facilitate the conversion reaction under high S loading condition is the key to solve the commercialization of Li–S batteries. For this system, the availability of raw materials and simplicity (high efficiency) of synthetic strategies are also important factors. Herein, we propose an interlaced two-dimensional (2D) carbon material as advanced Li–S cathode host characterized by corrugated monolithic morphology and Co/N dopants as dual lithiophilic–sulfiphilic sites. This 2D structure is derived from a cheap biomass precursor, adenine, with bonding interaction with a MgCl2 hydrate template via a facile ionothermal method. It allows a homogeneous spatial distribution of S/Li2S deposits and strong adsorbability and enhanced conversion kinetics for polysulfides. Benefiting from the synergistic effects of corrugated 2D conductive matrix and embedded heteroatom/nanodot catalyst, the resultant sulfur cathode releases a high specific capacity of 1290.4 mA h g–1 at 0.2 C, small capacity fading rate of 0.029% per cycle over 600 cycles at 2 C, superior rate performance up to 20 C, and considerable areal capacity retention of 6.0 mA h cm–2 even under an ultrahigh sulfur loading up to 9.7 mg cm–2.
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Energy & Environmental Science
·
2018
·Vol. 11
·期 9
·2620-2630
·
IF 30.067
Yingze Song,Wen Zhao,Long Kong,Li Zhang,Xingyu Zhu,Yuanlong Shao,Feng Ding,Qiang Zhang,Jingyu Sun,Zhongfan Liu
Lithium–sulfur (Li–S) batteries are deemed as one of the most promising next-generation energy storage systems. However, their practical application is hindered by existing drawbacks such as poor cycling life and low Coulombic efficiency due to the shuttle effect of lithium polysulfides (LiPSs). We herein present an in situ constructed VO2–VN binary host which combines the merits of ultrafast anchoring (VO2) with electronic conducting (VN) to accomplish smooth immobilization–diffusion–conversion of LiPSs. Such synchronous advantages have effectively alleviated the polysulfide shuttling, promoted the redox kinetics, and hence improved the electrochemical performance of Li–S batteries. As a result, the sulfur cathode based on the VO2–VN/graphene host exhibited an impressive rate capability with ∼1105 and 935 mA h g−1 at 1C and 2C, respectively, and maintained long-term cyclability with a low capacity decay of 0.06% per cycle within 800 cycles at 2C. More remarkably, favorable cyclic stability can be attained with a high sulfur loading (13.2 mg cm−2). Even at an elevated temperature (50 °C), the cathodes still delivered superior rate capacity. Our work emphasizes the importance of immobilization–diffusion–conversion of LiPSs toward the rational design of high-load and long-life Li–S batteries.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-10
·
IF 4.122
Cai Jianguo,Zhang Yanyang,Qian Yue,Shan Chao,Pan Bingcai
A novel nanocomposite bead LaLiAl-LDH@201 was fabricated by doping a small amount of La into nanocrystalline Li/Al layered double hydroxides (LDHs) pre-confined inside polystyrene anion exchanger D201 (LiAl-LDH@201). A systematic characterisation of the resultant LaLiAl-LDH@201 (XRD, SEM-EDS, TEM-EDS, and XPS) evidenced the successful incorporation of La into the Li/Al LDHs, with their interlayer distance expanded to allow more exchangeable sites for fluoride uptake. The resultant LaLiAl-LDH@201 showed high and stable defluoridation performance over a wide range of pH from 4 to 9. The superior uptake capacity and affinity for fluoride of LaLiAl-LDH@201 over LiAl-LDH@201 were driven by both the increased anion exchange capacity of the embedded LDHs and the specific La-F interaction evidenced via XPS and TEM-EDS characterisation. Fixed-bed column test confirmed that the working capacity of LaLiAl-LDH@201 for defluoridation of authentic fluoride-rich groundwater was nearly twice that of LiAl-LDH@201. The fluoride-loaded LaLiAl-LDH@201 could be conveniently regenerated in situ by using NaOH + NaCl binary solution, achieving desorption efficiency above 98%. Moreover, negligible capacity loss, La leaching, or structure alteration was observed after five adsorption-regeneration cycles, indicating the high stability of LaLiAl-LDH@201. Therefore, the novel millisphere nanocomposite LaLiAl-LDH@201 was promising for efficient defluoridation from water and wastewater.
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ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Chuan Wang,Wu Tang,Zeyi Yao,Yongzhen Chen,Jingfang Pei,Cong Fan
Terephthalic acid (H 2 TP) is initially unveiled to be the first example of organic anodes exhibiting the universal Li-ion, Na-ion and K-ion storage capabilities. In Li-ion half cells, H 2 TP can deliver the average capacities of ∼235 mAh g −1 for 500 cycles; In Na-ion half cells, H 2 TP is reported to deliver the average capacities of ∼200 mAh g −1 for 50 cycles; and in K-ion half cells, H 2 TP can exhibit the average capacities of ∼240 mAh g −1 for 150 cycles. At the same time, the chemical structure and crystal structure of H 2 TP could be transformed into its related metal salts on the anode side due to the low reduction potential. This work indicates that organic electrode materials should own the universal metal-ion-storage (e.g., Li + , Na + , K + , etc.) capability for their large void room of organic solid/crystal state.
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Energy Technology
·
2018
·Vol. 7
·期 8
·1800829
·
IF 3.175
Bin Xiao,Peng-bo Wang,Zhen-jiang He,Zhuo Yang,Lin-bo Tang,Chang-sheng An,Jun-chao Zheng
0.5Li 2 MnO 3 ·0.5LiNi 0.5 Mn 0.3 Co 0.2 O 2 cathode materials with nano-MgO and nano-TiO 2 coating layers are synthesized via a facile approach. These nanocoating layers with a thickness of ≈20 nm are homogeneously coated on the surface of the materials. With the nano-MgO and nano-TiO 2 coating layers, the modified materials deliver excellent electrochemical performance. Nano-MgO-coated and nano-TiO 2 -coated Li-rich materials exhibit 147.56 and 137.96 mAh g −1 after 100 cycles at 1C rate and deliver 156.13 and 130.69 mAh g −1 at 2C rate, respectively, in the voltage range of 2.0–4.8 V. The materials with nano-MgO and nano-TiO 2 coating layers also show a high discharge voltage retention of more than 90% after 50 cycles, low impedance for Li + migration, and high diffusion coefficients of the lithium ions. Nano-MgO and nano-TiO 2 coating layers help decrease the content of Li 2 CO 3 on the surface of the materials and suppress side reactions. Thus, these materials play a significant role in strengthening the electrochemical performance of Li-rich cathode materials.
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JOURNAL OF SOLID STATE CHEMISTRY
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2015
·
IF 2.133
Yunsheng Liu,Dajiang Mei,Jingli Xu,Yuandong Wu
New alkali metal zinc selenites, A 2 Zn 3 (SeO 3 ) 4 · X H 2 O (A=Li, Na, K; X =2 or 0) were prepared through hydrothermal reactions . Li 2 Zn 3 (SeO 3 ) 4 ·2H 2 O ( 1 ) crystallizes in the monoclinic space group P 2 1 / c with lattice parameters a =8.123(4), b =9.139(4), c =7.938(3) Å, β =112.838(9)°. Na 2 Zn 3 (SeO 3 ) 4 ·2H 2 O ( 2 ) crystallizes in the monoclinic space group C2/c with lattice parameters a =15.7940(18), b =6.5744(8), c =14.6787(17) Å, β =107.396(3)°. K 2 Zn 3 (SeO 3 ) 4 ( 3 ) crystallizes in the monoclinic space group C2/c with lattice parameters a =11.3584(12), b =8.6091(9), c =13.6816(14) Å, β =93.456(2)°. The anionic structures are composed of [Zn 3 O 12 ] 18− sheets, chains, and “isolated” units in compound 1, 2, 3, respectively, and trigonal pyramids SeO 3 2− . The compounds were characterized by the solid state UV–vis–NIR diffuse reflectance spectroscopy , infrared spectra and thermogravimetric analysis .
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CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Renping Cao,Qingqiang Xiong,Wenjie Luo,Donglan Wu,Xiao Fen,Xiaoguang Yu
A series of SrAl [4−(4 x )/3] O 7 : x Mn 4+ (0≤ x ≤1.4 mol%) and Sr (1−0.06/2) Al [4−(4×0.008)/3] O 7 :0.008Mn 4+ ,0.06R + (R + =Li + , Na + , and K + ) phosphors are synthesized by a conventional solid-state reaction method in air. The PLE bands peaking at~325, 395, and 470 nm and the strongest PL band peaking at~660 nm are assigned to the 4 A 2 → 4 T 1 transition of Mn 4+ ion and O 2− –Mn 4+ change transfer band, 4 A 2 → 2 T 1 , 4 A 2 → 4 T 2 , and 2 E → 4 A 2 transitions, respectively. The optimum Mn 4+ doping concentration is about 0.8 mol%. Li + , Na + , and K + ions used as charge compensator can improve observably the PL intensity of SrAl 4 O 7 :Mn 4+ phosphor with excitation 325 nm. The fluorescence lifetimes of SrAl [4−(4×0.008)/3] O 7 :0.008Mn 4+ and Sr [1−0.06/2] Al [4−(4×0.008)/3] O 7 :0.008Mn 4+ ,0.06 R + (R + =Li + , Na + , and K + ) are 0.958, 0.97, 1.113 and 0.965 ms, respectively. The luminous mechanism is explained by schematic energy level diagram of Mn 4+ ion. These experiment results indicate that SrAl 4 O 7 :Mn 4+ ,R + (R + =Li + , Na + , and K + ) phosphors can be used as red emitting phosphor candidate for white LEDs based on a UV (~325 nm) and near UV (~395 nm) bands of LEDs chip.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Peng Chen,Siyang Tang,Hairong Yue,Changjun Liu,Chun Li,Bin Liang
A new method coupling CO2 mineralization and solvent extraction was proposed and investigated to precipitate magnesium from high Mg/Li ratio brine. Organic amine was employed to extract HCl formed during the CO2 mineralization process and to realize continuous conversion of MgCl2 to precipitated MgCO3, thereby removing the magnesium contained in the brine. The effects of brine concentration, extractant, diluents, extractant concentration, phase ratio, and reaction temperature were systematically investigated. A blend of trioctylamine and isoamyl alcohol was used as the extractant and diluent, and the reaction parameters were optimized. The mechanism was proposed, and a stripping process was designed. Under the optimal conditions, the conversion of magnesium was as high as 67.41%, and the Mg/Li ratio of the raffinate decreased from 20 to 5.4.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Ruihong Li,Junli Li,Kaiyu Qi,Xin Ge,Qiwei Zhang,Bangwen Zhang
Silicon is one of the most promising candidates for next-generation anode of Lithium-ion batteries. However, poor electrical conductivity and large volume change during alloying/dealloying hinder its practical use. Here we reported a three-dimensional (3D) nitrogen and sulfur codoped graphene supported silicon nanoparticles composite (SN-G/Si) through one-step hydrothermal self-assembly. The obtained SN-G/Si was investigated in term of instrumental characterizations and electrochemical properties. The results show that SN-G/Si as a freestanding anode in LIBs delivers a reversible capacity of 2020 mAh g −1 after 100 cycles with coulombic efficiency of nearly 97%. The excellent electrochemical performance is associated with the unique structure and the synergistic effect of SN-G/Si, in which SN-G provides volume buffer for nano Si as the flexible loader, short paths/fast channels for electron/Li ion transport as porous skeleton, and low charge-transfer resistance.
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SOLID STATE IONICS
·
2016
·
IF 2.38
Cheng-Dong Li,Jin Xu,Ji-Sheng Xia,Wei Liu,Xin Xiong,Zhu-An Zheng
The FeF 3 -coated Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 cathode materials were synthesized via a wet chemical process followed by a solid state reaction . The physical properties of the as-prepared samples were conducted using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy . The results indicated that the surface of cathode particles was covered by FeF 3 film (about 5–15 nm thick). Compared with the bare cathode, the FeF 3 -coated Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 one delivered the higher coulombic efficiency, better rate capability, longer cycle life, and better structure stability. A high capacity retention of 95% (190 mAh g − 1 ) after 100 cycles at 0.5 C rate was obtained for the FeF 3 -coated Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 cathode. Besides, the results from cyclic voltammetry and electrochemical impedance spectra revealed that the noteworthy enhanced electrochemical properties of the surface-modified sample were due to the presence of FeF 3 coating layer , which suppressed the side reaction between the Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 particles with electrolyte and further stabilized the Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 structure with cycling.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Kai Liu,Fei Ding,Jiaquan Liu,Qingqing Zhang,Xingjiang Liu,Jinli Zhang,Qiang Xu
A cross-linking succinonitrile (SN)-based composite polymer electrolyte (referred to as “CLPC–CPE”), in which vinyl-functionalized SiO2 particles connect with trimethylolpropane propoxylate triacrylate (TPPTA) monomers by covalent bonds, was prepared by an ultraviolet irradiation (UV-curing) process successfully. Vinyl-functionalized SiO2 particles may react with TPPTA monomers to form a cross-linking network within the SN-based composite polymer electrolyte under ultraviolet irradiation. Vinyl-functionalized SiO2 particles as the fillers of polymer electrolyte may improve both the thermal stability of CLPC–CPE and interfacial compatibility between CLPC–CPE and electrodes effectively. There is no weight loss for CLPC–CPE until above 230 °C. The ionic conductivity of CLPC–CPE may reach 7.02 × 10–4 S cm–1 at 25 °C. CLPC–CPE has no significant oxidation current until up to 4.6 V (vs Li/Li+). The cell of LiFePO4/CLPC–CPE/Li has presented superior cycle performance and rate capability. The cell of LiFePO4/CLPC–CPE/Li may deliver a high discharge capacity of 154.4 mAh g–1 at a rate of 0.1 C after 100 charge–discharge cycles, which is similar than that of the control cell of LiFePO4/liquid electrolyte/Li. Furthermore, the cell of LiFePO4/CLPC–CPE/Li can display a high discharge capacity of 112.7 mAh g–1 at a rate of 2 C, which is higher than that of the cells assembled with other plastic crystal polymer electrolyte reported before obviously.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xiaobo Jia,Mo Yan,Ziyou Zhou,Xianglei Chen,Chao Yao,De Li,Daming Chen,Yong Chen
Layered Nd-doped LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) compounds were successfully synthesized via a coprecipitation-assisted solid-phase method in this work. The effects of Nd doping on the crystal structure, morphology, and electrochemical properties were characterized thoroughly using XRD, SEM, TEM, EDX, and electrochemical tests. Rietveld refinement of the X-ray diffraction data indicated that the Nd-doped samples had lower cation mixing than the raw NCM523. The SEM and EDX mapping characterization results demonstrated that Nd atoms were uniformly distributed in NCM523. At 1C and 10C, the Li(Ni 0.5 Co 0.2 Mn 0.3 ) 0.992 Nd 0.008 O 2 materials exhibited initial discharge capacities of 189.7 and 101.5 mAh g −1 , respectively, with capacity retentions of 83.3% and 88%, respectively, compared to those of NCM523 (68.1% and 52.5%, respectively) with a cutoff voltage of 4.8 V after 100 cycles. It was found that NCM523 doped with Nd 3+ ions can expand lithium ion diffusion channels in the layered structure and stabilize the structure of the material.
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