JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2018
·Vol. 56
·期 22
·2574-2583
·
IF 2.588
Zhangxin Chen,Chang Su,Xiaogang Zhu,Ruoteng Xu,Lihuan Xu,Cheng Zhang
A novel organic conjugated polymer based on star-shaped triazine-functional triphenylamine framework poly[1,3,5-tris(4-diphenylamino-phenyl)triazine] (PTDAPTz) is designed and synthesized successfully by FeCl 3 -catalysted chemical oxidative polymerization. The polymer PTDAPTz powder exhibits a compactly packed pleated skirt shape-like morphology with a high surface area (~930 m 2 g −1 ) and a bimodal pore size distribution ranging from micropores (~0.55 nm) to small diameter mesopores (~2–6 nm). As explored as the cathode material, the obtained PTDAPTz presents the double charge–discharge process characteristics of both the free radical redox of triphenylamine unit and the bipolar redox of triazine unit in the polymer and a well-defined multistage charge/discharge voltage plateau (~3.8 V for p-doped and ~2.0 V for n-doped) during the charge–discharge process. Also, the PTDAPTz demonstrates an improved capacity (stabilized at 123 mA h g −1 until 50th cycle) and the enhanced rate performance compared to polytriphenylamine (PTPAn). Specially, the discharge curve for the part of triphenylamine unit presents an obviously improved discharge plateau (~3.8 V for PTDAPTz compared to ~3.6 V for PTPAn) due to the electron-withdrawing effect of the triazine unit to triphenylamine. The elaborate structural design and created micro-/mesoporous morphology with the double charge–discharge process make PTDAPTz a potential candidate as the performance-improved cathode of Li-organic battery. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56, 2574–2583
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高影响因子
2D Materials
·
2022
·Vol. 9
·期 2
·025028
·
IF 6.861
Meng Yuan,Haodong Shi,Cong Dong,Shuanghao Zheng,Kai Wang,Shaoxu Wang,Zhong-Shuai Wu
Some vital challenges are main obstacles for further development of lithium–sulfur (Li–S) batteries such as low capacity and poor cycle stability resulted from polysulfide shuttling behavior, the physical/chemical entrapment is regarded as an effective method to inhibit and catalyze polysulfides. Herein we design a cross-linked framework of reduced graphene oxide anchored with Cu2−xSe nanoparticles (Cu2−xSe@rGO) by building an electrolyte/Cu2−xSe/graphene triple-phase interface to be a high-efficiency electrocatalyst for Li–S batteries. Importantly, this three-dimensional conductive network possesses a large specific surface area with high ion transport capability, meanwhile providing strong physical constraint for efficient adsorption of soluble polysulfides. Further, this triple-phase catalytic interface provides strong chemical adsorption and abundant Cu2−xSe nanoparticle sulfiphilic active sites, effectively inhibiting the dissolution of polysulfides and guaranteeing the efficient polysulfide adsorption catalysis as well as rapidly uniform Li2S nucleation. Consequently, with the Cu2−xSe@rGO separator, a lower capacity decay rate about 0.059% per cycle after 500 cycles at 2 C is obtained. What's more, with a higher areal sulfur loading of 3.0 mg cm−2, the capacity is still maintained at 805 mAh g−1 over 100 cycles. Therefore, this work will open new avenue to construct 2D transition metal selenide for superior performance Li–S batteries.
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JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Xiaohua Jing,Zhumei Sun,Dandan Zhao,Xiaoning Tang,Wenjing Lv,Yunfeng Shi
In this study, five novel ionic liquids denoted by [RNH 3 ][Cyanex 272] where R = C 4 H 9 , C 6 H 13 , C 8 H 17 , C 10 H 21, and C 12 H 25 were synthesized in a one-step reaction of straight-chain primary amines and Cyanex 272. The singe-stage extraction performance of [RNH 3 ][Cyanex 272] for the separation of Mn 2+ , Co 2+ , Ni 2+ and Li + was investigated. Compared with the other [RNH 3 ][Cyanex 272], the [C 4 H 9 NH 3 ][Cyanex 272] has good selective extraction and separation of Mn 2+ , Co 2+ , and Ni 2+ due to the smaller different value between the radius of metal ion and the radius of [C 4 H 9 NH 3 ] + . Using a three-stage cross flow extraction, the extraction percentages of Mn 2+ , Co 2+ , Ni 2+ , and Li + were about 99.4, 99.1, 14.9 and 0.9 %. The [C 4 H 9 NH 3 ][Cyanex 272] is a good extraction agent for co-extraction of Mn 2+ , Co 2+ , and a part of Ni 2+ from Li + based on a three-stage cross flow extraction. Diluted sulfuric acid was used to strip the organic phase containing Mn 2+ , Co 2+ , and Ni 2+ , and the aqueous phase containing Mn 2+ , Co 2+ , and Ni 2+ can be used for the preparation of ternary precursor materials. The precipitation method can be used to prepare Ni(OH) 2 and Li 2 CO 3 from an aqueous phase containing Ni 2+ and Li + . The conceptual recycling flow-sheet for Mn 2+ , Co 2+ , Ni 2+ , and Li + from spent ternary lithium batteries was presented on basis of the new extraction agent. The slope method was also used to investigate the mechanism of the extractive reaction of Mn 2+ , Co 2+ , and Ni 2+ using the [C 4 H 9 NH 3 ][Cyanex 272].
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高影响因子
Frontiers in Materials
·
2018
·
IF 2.008
Zhimin Zou,Limin Wu,Jianwei Chen,Chunhai Jiang
Graphene is not an ideal anode material of Li-ion batteries because of its low packing density and low initial Coulombic Efficiency although it shows much higher specific capacity than graphite. Herein, we report a sandwich-structured hybrid anode material which integrates the nitrogen-doped amorphous carbon nanoarrays on both sides of graphene nanoplatelets. The former provides high capacity and excellent rate capability, while the latter stabilizes the cycle performance, both of them brought out outstanding electrochemical properties to the hybrid anode. High discharge capacities of 562 and 217 mA h g−1 are obtained at current densities of 0.1 and 3 A g−1, respectively, which are much higher than those of the starting graphene nanoplatelets (404 and 81 mA h g−1, respectively). Moreover, a discharge capacity of 540 mA h g−1 is maintained after 300 cycles at 0.5 A g−1, demonstrating an excellent cycle stability. This study provides a facile process to prop up the 2 D graphene nanoplatelets with vertically aligned carbon nanoarrays, which may push forward the application of graphene as anode material of Li-ion batteries because of the avoided aggregation and additional Li storage capacity contributed by the N-doped amorphous carbon.
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高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Ziling Wang,Xianzhu Peng,Shuai Guo,Mingjie Sun,Junfang Cheng,Lu Zou,Bo Chi,Jian Pu
Catalysts with high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performances are crucial to the development of lithium-oxygen batteries (LOBs), which aim to promote Li2O2 deposition and decomposition and then avoid the active site passivation. Considering the metallic Ag possessing good electrical conductivity and excellent catalytic activity and perovskite oxides exhibiting high abundance, an easily tunable structure, and excellent intrinsically catalytic activity, we adopt the ultraviolet light to realize the deposition of Ag nanoparticles on the La0.6Sr0.4Fe0.9Mn0.1O3 (LSFM) substrate as a high-performance cathode for LOBs. The results confirm that the synergetic effect of Ag nanoparticle decoration and the La0.6Sr0.4Fe0.9Mn0.1O3 substrate could dramatically improve the electronic conductivity and ORR/OER kinetics of the nanohybrids. Ag@LSFM hybrids with abundant active sites and considerable electronic conductivity promote the deposition of a thinner discharge product film, and the corresponding LOBs deliver high discharge capacity (12 477 mAh g–1), a small gap between charge and discharge potentials (∼1.3 V), and high cycling stability (147 cycles). Overall, the study suggests that such a bifunctional catalyst is a promising candidate in LOBs.
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Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 9
·4359-4367
·
IF 8.262
Yong Li,Shuan Wang,Yan-Bing He,Linkai Tang,Yusuf Valentino Kaneti,Wei Lv,Zhiqun Lin,Baohua Li,Quan-Hong Yang,Feiyu Kang
Titanium oxide (TiO2) has attracted great interest as a promising anode material for lithium (Li) ion batteries (LIBs) and sodium (Na) ion batteries (SIBs). However, the key factors that dictate the Li-ion and Na-ion storage and transportation in TiO2 remain unclear. Herein, we report a facile hydrolysis route to crafting a variety of high tap-density TiO2 spheres with controllable size and hierarchical pores. The Li-ion and Na-ion storage properties based on these TiO2 spheres were systematically investigated. The pore distribution and the size of TiO2 spheres were found to exert profound influence on the Li-ion and Na-ion storage and transportation. The Li-ion storage and transportation in dense TiO2 spheres was dependent mainly upon the micropore distribution and volume and independent of the size of spheres. In contrast, the excellent Na-ion storage and transportation in TiO2 spheres was enabled by the loose structure with a large macroscopic pore volume and shortened Na-ion diffusion length. High tap-density TiO2 spheres (1.06 g cm−3) with superior Li-ion and Na-ion storage properties were produced, exhibiting a Li-ion storage specific capacity of 189 mA h g−1 at 1C and a high capacity retention of 88.1% after 100 cycles, and a Na-ion storage specific capacity of 184 mA h g−1 at 1C and capacity retention of 90.5% after 200 cycles. The ability to understand the critical factors controlling the Li-ion and Na-ion storage in high tap-density TiO2 spheres enables their implementation for practical applications in Li-ion and Na-ion batteries.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jinhong Song,Chen Zhang,Zejian Zheng,Shizhe Huo,Yihan Lin,Fei Yang,Lei Liu
SnO 2 layer between Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) and lithium anode was prepared through simple scratch-coating process to improve interface properties. The physical phase, morphology, and electrochemical properties of Li/SnO 2 /LAGP structure were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical analytical methods. It was found that SnO 2 layer effectively improved the interface stability of LAGP and lithium anode. The prepared Li/SnO 2 /LAGP/SnO 2 /Li symmetric cell exhibited a large critical current density of 1.8 mA cm −2 and demonstrated excellent cycling characteristics. The polarization voltages of symmetric cell were 0.1 V and 0.8 V after 1000 h of cycling at current densities of 0.04 mA cm −2 and 0.5 mA cm −2 , respectively. Li/SnO 2 @LAGP/LiFePO 4 solid-state full cells were also assembled, exhibiting a discharge specific capacity of 150 mAh g −1 after 200 cycles at 0.1C with capacity retention rate of 96 %. The good interface properties of Li/SnO 2 /LAGP structure are attributed to the transformation of SnO 2 layer into a buffer layer containing Li 2 O, Sn 0 , and Li x Sn y alloy during cycling process, which effectively inhibits the reduction reaction between LAGP and lithium anode.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chao Wu,Heng Li,Shuang Cao,Zhi Li,Peng Zeng,Jiarui Chen,Xitong Zhu,Xiaowei Guo,Gairong Chen,Baobao Chang,Yongqiang Shen,Xianyou Wang
Benefiting from the extra contribution of O redox, Co-free Li-rich layered oxides (LRNMO) can satisfy the requirement of high specific capacities. However, during the high-voltage charging process, lattice oxygen being oxidized to O − or O 2 leads to a gradual transition of the structure from layered to spinel phase, capacity and voltage decline, hindering the practical application of LRNMO in the lithium-ion battery. Here, a surface modification strategy of Li 1.2 Ni 0.32 Mn 0.48 O 2-δ doped with Ta 5+ ions is proposed, in which the Ta 5+ ions occupy the lithium sites of the lattice structure on the surface layer of LRNMO and form a Ta 2 O 5 coating layer. The modified electrode exhibits excellent rate performance and cycling stability, with 94.9% and 85.5% capacity retention rate and voltage retention rate, respectively, after 200 cycles at 1C. Moreover, the initial coulomb efficiency and ionic conductivity of the modified electrode are also apparently enhanced. Simultaneously, the decreased Li/Ni mixing degree of the modified electrode reflects the improvement of the structural stability . Therefore, the modification strategy through strong metal–oxygen bonding to integrate the surface structure to regulate the oxygen activity provides a new direction for the design of high energy density Co-free Li-rich cathode materials .
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Rujie Li,Wanhang Wang,Yangyang Wang,Xiaoyu Wei,Ziqi Cai,Zhiyong Zhou
A novel ionic liquid named 1-butyl-3-methylimidazolium tetraphenylboron ([Bmim]Bph 4 ) containing a stereo symmetric structure of Bph 4 - was synthesized and used as co-extractants with TBP and CH 2 BrCl as extractant and diluent for selective extraction of lithium ions from salt lake brines with high molar ratio of magnesium to lithium. The effects of extraction conditions containing molar ratio of co-extractant to lithium ion, volume percentage of TBP and O/A phase ratio on extraction performance were investigated. Under the optimal extraction conditions, the maximum separation factor of lithium to magnesium reached up to 2754 after one single-stage extraction process. After four stages of counter-current extraction process, the extraction efficiency of Li + reached up to 99.47%. Then the washing and stripping conditions were optimized with the combination of LiCl and NaCl solution as the washing agent and Na 2 CO 3 solution as the stripping agent. After that, 10 cycles of the whole extraction experiments were carried out and the organic phase exhibited excellent reusability and stability. Since no acid and alkaline were used throughout the extraction process, the novel extraction process is greener and more environmentally friendly than the traditional solvent extraction process.
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高影响因子
ORGANIC ELECTRONICS
·
2020
·
IF 3.31
Mengdi Wang,Wenqing Zhu,Zhengyuan Yin,Lu Huang,Jun Li
The hole-injection layer (HIL) has vital impacts on the electroluminescence performance of organic light-emitting diodes (OLEDs). Herein, low-temperature solution-processed Li-doped nickel oxide (Li:NiO x ) was fabricated as a novel HIL for OLEDs. As a result, the phosphorescent green OLED with 5% molar ratio Li:NiO x exhibits the best performance with low turn-on voltage of 3.1 V, maximum current efficiency of 55.8 cd A −1 , maximum power efficiency of 57.2 lm·W −1 and maximum external quantum efficiency of 17.1%. While it is only 52.1 cd A −1 , 50.9 lm·W −1 and for the reference device with undoped NiO x film, corresponding a 7%, 12% and 8% enhancement in efficiency respectively . It reveals that the improved efficiency of the Li:NiO x film HIL based device with is mainly ascribed to the synergistic effect of extrinsic doping in the aspects of achieving enhanced hole injection. Our work demonstrates that the solution-processed Li-doped NiO x film is a promising HIL for high-performance OLEDs.
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xinmiao Liang,Yangming Jiang,Wuyao Cai,Shuaishuai Wu,Liying Wang,Zhenyu Lei,Junfei Chen,Youyi Lei,Li Yang,Jiwen Feng
The fast Li-ion pathways in crystals contribute to superionic conductivity—extraordinarily high ionic conductivity—of the Li10GeP2S12 (LGPS) structure. Composition tuning is expected to improve the conductivity. The phase behavior, microstructure, and ion dynamics of a series of solid solutions of xLi4GeS4–yLi3PS4 (4/1 ≥ x/y ≥ 1/2) were studied by multiple 7Li and 31P solid-state NMR methods. Li10GeP2S12 (Ge/P = x/y = 1/2) is the smallest x/y of the disordered LGPS structure. When the Ge/P ratio increases, the room-temperature Li ionic conductivity first increases to a maximum around x/y = 1/1.2 and then decreases. Meanwhile, a disordered LGPS structure transforms into an ordered LGPS′ structure synchronously with conductivity reduction. The Li4GeS4–Li3PS4 phase diagram with the order–disorder structure transition was reconstructed accordingly. Both ordered LGPS′ and disordered LGPS exhibit similar two-dimensional (2D) and one-dimensional (1D) Li diffusion paths. But the disordered LGPS structure is conducive to fast ionic conductivity, rooted in its fast 2D Li+ diffusion in the ab-plane rather than 1D diffusion along the c-axis. Two high-temperature relaxation processes are observed in the LGPS′ structure, suggesting heterogeneous 2D jumps of rapid and slow rates, whereas only a single homogeneous 2D jump process was found in the LGPS structure. Our findings provide insight into understanding the relationship between structure order (or disorder) and ionic conductivity of superionic materials, offering guidelines for optimizing ionic conductivity for extensive solid electrolyte materials rather than LGPS materials.
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高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Shuai Yan,Xianbo Zhou,Haomiao Li,Yi Shen,Yaling He,Hao Zhou,Kangli Wang,Kai Jiang
As expected, a desired electrochemical energy storage system can simultaneously combine the low-cost raw materials with ultra-high energy density and no performance degradation characteristics. Here, we use liquid lithium as the anode, solid antimony as the cathode, molten LiF–LiCl–LiBr (or molten LiF–LiCl) as the electrolyte and test the battery at 550 °C. It can provide the energy density as high as 421.6 Wh kg −1 , while the energy storage cost is only 42.4 $ kWh −1 . More importantly, due to the self-healing characteristic of the pure antimony electrode, no capacity fading is observed during 470 cycles. Therefore, with all the merits, the Li||Sb liquid metal battery has become a competitive choice in the field of grid-level energy storage.
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高影响因子
危险品化学品经营许可证（带存储）