ChemElectroChem
·
2019
·Vol. 6
·期 13
·3393-3400
·
IF 3.975
Shan Gong,Guangyu Zhao,Naiqing Zhang,Kening Sun
Graphical An upscaling opportunity : Polyethyleneimine (PEI) modified GO sheets (PEI−GO) absorb the ammonium thiomolybdate on the surface via electrostatic attraction, accompanying with the layer-by-layer assembling in the solution. The subsequent annealing process creates a sheet-on-sheet structure with unilaminar MoS 2 nanosheets lie on the GR sheets. Two-dimensional (2D) heterostructured materials, combining the desired advantages of individual 2D materials and eliminating the associated shortcomings, have inspired great interest in electrochemical energy storage applications. But searching a highly efficient and practical method for preparing 2D heterostructures as electrode materials is still challenging. Herein, a 2D MoS 2 /graphene (GR) heterostructure is synthesized through a facile and accessible self-assembly method, which includes adsorbing ammonium thiomolybdate onto graphene oxide (GO) surface via electrostatic attraction and subsequently annealing the precursor to heterostructure. A high loading amount (86.2 %) of unilaminar MoS 2 nanosheets lie on the GR sheets forming a face-to-face structure, and the MoS 2 nanosheets exhibit a largely expanded interlayer spacing (1.0–1.2 nm) resulting from the alternately stacked structure during self-assembly process. As a Li-ion intercalation host, this unique MoS 2 /GR heterostructure exhibits pseudocapacitance-dominated characteristics with superior kinetic performances and extremely high structural stability. These characteristics afford MoS 2 /GR heterostructure remarkable rate capability (155.6 mAh g −1 at 4 A g −1 ; 119.3 mAh g −1 at 16 A g −1 ) and a durable reversible capacity (over 5000 cycles). This method is suitable for mass production of MoS 2 /GR heterostructure and paves a way for utilizing 2D heterostructured materials in Li-ion or other metal ion batteries.
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Energy Technology
·
2018
·Vol. 6
·期 12
·2358-2366
·
IF 3.175
Junkai Zhao,Zhixing Wang,Jiexi Wang,Huajun Guo,Xinhai Li,Weihua Gui,Ning Chen,Guochun Yan
The rapid rise of electrode impedance and capacity decay of Ni-rich layered cathode materials during high-voltage cycling are rooted in their severe structural degradation. Here we present a feasible strategy, anchoring ∼1 % K + into the Li + sites of LiNi 0.8 Co 0.15 Al 0.05 O 2 as an excellent structural stabilizer, to overcome aforementioned issues, and the similarities and differences in terms of modification mechanism is compared with Na + . Showing difference with Na + that tends to migrate into electrolyte during high-voltage cycling, K + occupies in Li + site firmly because of its larger ionic radius and lower migrating ability, which sustainably prevent the irreversible phase transition between two hexagonal phases (H2 and H3) and impede the cation migration in highly delithiated state, thus suppressing the structural degradation. Benefiting from these merits, Li 0.99 K 0.01 Ni 0.8 Co 0.15 Al 0.05 O 2 delivers a large initial discharge capacity of 217 mAh g −1 at 0.1 C and maintains stable cycling at 1 C in a high voltage of 4.6 V (remaining 87.4 % of its initial capacity after 150 cycles). The mechanism proposed in this work, accounting for enhanced structural stability under high-voltage cycling by K + anchoring in Ni-rich cathode materials, provides a vital hint for rational designing advanced cathode materials to pursue high energy density Li-ion batteries.
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RSC Advances
·
2018
·Vol. 8
·期 41
·23397-23403
·
IF 2.936
Zhuo-Liang Jiang,Jing Xie,Cong-Shan Luo,Meng-Yang Gao,Huan-Liang Guo,Mo-Han Wei,Hong-Jun Zhou,Hui Sun
The mechanism of Li–O2 batteries is based on the reactions of lithium ions and oxygen, which hold a theoretical higher energy density of approximately 3500 W h kg−1. In order to improve the practical specific capacity and cycling performance of Li–O2 batteries, a catalytically active mechanically robust air cathode is required. In this work, we synthesized a freestanding catalytic cathode with RuO2 decorated 3D web Co3O4 nanowires on nickel foam. When the specific capacity was limited at 500 mA h g−1, the RuO2–Co3O4/NiF had a stable cycling life of up to 122 times. The outstanding performance can be primarily attributed to the robust freestanding Co3O4 nanowires with RuO2 loading. The unique 3D web nanowire structure provides a large surface for Li2O2 growth and RuO2 nanoparticle loading, and the RuO2 nanoparticles help to promote the round trip deposition and decomposition of Li2O2, therefore enhancing the cycling behavior. This result indicates the superiority of RuO2–Co3O4/NiF as a freestanding highly efficient catalytic cathode for Li–O2 batteries.
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高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Jiuyun Cui,Zhiping Zhou,Atian Xie,Siwei Liu,Qianqian Wang,Yilin Wu,Yongsheng Yan,Chunxiang Li
Lithium resources are attractive for different applications because of their specific properties. Therefore, it is more significant to find a cost-effective and environment-friendly method to selective adsorption and recovery of Li + . In this work, a renewable and easy degradable CA/CS hybrid membrane was modified with polydopamine as adhesion layer to anchored TiO 2 . The simple imprinting process could be realized by hydrolysis polymerization. The adsorption process followed Langmuir isotherm model and pseudo-second-order kinetic equation were researched in detail. The results displayed the maximum adsorption capacity is 20.08 mg g −1 for Li + . The selectivity factors of Li + to Na + , K + , Mg 2+ and Ca 2+ are 1.78, 2.43, 2.60 and 3.61, respectively, which mainly attributed to imprinting effect. The LIICMs also exhibited the superior reusability and durability. Thus, the LIICMs provide a powerful tool for selective separation and recovery of Li + from mixed solutions.
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高影响因子
Nano Research
·
2018
·Vol. 11
·期 12
·6294-6303
·
IF 7.994
Han Ying,Zhou Jie,Li Tieqiang,Yi Zheng,Lin Ning,Qian Yitai
Two-dimensional (2D) materials have attracted enormous attention due to their functional applications in energy storage. In this work, a low-temperature molten-salt chemical exfoliation methodology is developed for producing free-standing 2D mesoporous Si through deintercalation of CaSi 2 in excess molten AlCl 3 at 195 °C. The average dimension of these sheets is 1.5 μm, and the thickness of a single sheet is approximately 10 nm. The as-prepared 2D Si has a Brunauer–Emmett–Teller surface area of 154 m 2 ·g −1 and an average pore size of 5.87 nm. With this unique structure, the 2D Si exhibits superior Li-storage performance, including a reversible capacity of 2,974 mA·h·g −1 at 0.2 C, reversible capacities of 2,162, 1,947, and 1,527 mA·h·g −1 at 0.8, 2, and 5 C after 200 cycles, and a capacity retention of 357 mA·h·g −1 even at 30 C (90 A·g −1 ).
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SURFACE & COATINGS TECHNOLOGY
·
2018
·
IF 2.906
Yiqi Wei,Yinglin Yan,Yiming Zou,Mangmang Shi,Qijiu Deng,Nana Zhao,Shiyu Chen,Jiaming Lin,Rong Yang,Yunhua Xu
Lithium-sulfur (Li-S) battery processes high theoretical capacity (1675 mA h g −1 ) and energy density (2600 Wh kg −1 ), which was widely accepted as one of the most promising candidates for energy storage devices. In this presented study, bamboo-derived hierarchical porous carbon (BDPC) was adopted as a conducting substrate for containing S. Soft polystyrene (PS) and polyaniline (PANI), were prepared as coating layers. The main purpose is to figure out the specific roles that the polymer shells and the heteroatoms doped on polymer backbone play during cycles. The ternary products were characterized by structural analysis and electrochemical testing. The results indicate that, as compared to BDPC/S, the PS@BDPC/S electrode displays higher capacity retention during long-term cycles, especially at the high current rate. It is attributed to the integrated coating shell, which provides physical confinement and reserves spaces for restraining volume expansion. It is noted that the PANI@BDPC/S electrode presents a higher initial capacity, remarkable long-life performance, and excellent rate property. The outstanding performances are closely related to the nitrogen atom doped on PANI backbone, they provide not just abundant polar conducting sites for fast electron/Li-ion transport but strong chemical anchoring for restricting the migration of polysulfides . Therefore, our study poses a clearer understanding of the functionalized polymers used in Li-S battery.
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RSC Advances
·
2018
·Vol. 8
·期 66
·37811-37816
·
IF 2.936
Cejun Hu,Yingna Chang,Ruida Chen,Jijin Yang,Tianhui Xie,Zheng Chang,Guoxin Zhang,Wen Liu,Xiaoming Sun
The intrinsic polysulfide shuttle in lithium–sulfur (Li–S) batteries have significantly limited their practical applications. Conductive carbon materials with heteroatom doping and rich porosity is the most common strategy for the effective prevention of polysulfide shuttle, but are usually obtained with high costs and tedious procedures. Herein, we managed to obtain highly porous N, S-codoped carbon materials (NS-C) through treating waste plastic of polyvinylchloride (PVC) with KOH. The resulting NS-C was revealed to be highly efficient hosts for sulfur cathode, achieving large reversible capacities of 1205 mA h g−1 and 836 mA h g−1 at 0.1C and 1.0C, respectively, and remaining at 550 mA h g−1 after 500 cycles at 1C rate, showing an outstanding cycling stability. The significantly enhanced cycling performance was mainly ascribed to both the hierarchically porous structure and heavy N, S co-dopants, which respectively provided physical blocks and chemical affinity for the efficient immobilization of intermediate lithium polysulfides. The results provide an effective paradigm in the surface chemistry and sulfur cathode materials design for high-performance Li–S batteries and a new application for recycled plastic waste.
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Polymers
·
2018
·Vol. 10
·期 11
·1179
·
IF 2.935
Jingwei Wang,Zejia Zhao,Shenhua Song,Qing Ma,Renchen Liu
With 1-methyl-2-pyrrolidinone (NMP) as the solvent, the biodegradable gel polymer electrolyte films are prepared based on poly(vinyl alcohol) (PVA), lithium bis(trifluoromethane)sulfonimide (LiTFSI), and 1-ethyl-3 methylimidazoliumbis(trifluoromethylsulfonyl)imide (EMITFSI) by means of solution casting. The films are characterized to evaluate their structural and electrochemical performance. The 60PVA-40LiTFSI + 10 wt.% EMITFSI system exhibits excellent mechanical properties and a high ionic transference number (0.995), indicating primary ionic conduction in the film. In addition, because of the flexibility of polymer chain segments, its relaxation time is as low as 5.30 × 10−7s. Accordingly, a high ionic conductivity (3.6 × 10−3S cm−1) and a wide electrochemical stability window (~5 V) are obtained. The electric double-layer capacitor (EDLC) based on this electrolyte system shows a specific capacitance of 101 F g−1and an energy density of 10.3 W h kg−1, even after 1000 charge-discharge cycles at a current density of 0.4 A g−1under a charging voltage of 2 V. All these excellent properties imply that the NMP-soluble 60PVA-40LiTFSI + 10 wt.% EMITFSI gel polymer electrolyte could be a promising electrolyte candidate for electrochemical device applications.Keywords:PVA;biodegradable gel polymer electrolyte;ionic conductivity;electric double layer capacitor;electrochemical properties
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ACS Applied Energy Materials
·
2018
·
IF 0
Huanhuan Guo,Guangmei Hou,Jianguang Guo,Xiaohua Ren,Xiaoxin Ma,Linna Dai,Shirui Guo,Jun Lou,Jinkui Feng,Lin Zhang,Pengchao Si,Lijie Ci
Lithium–oxygen batteries (LOBs) have attracted increasing interest because of their superior theoretical specific energy. However, the stability of lithium metal anode is one of the obstacles limiting their practical applications. Here, we introduce an artificial Li3PO4 solid electrolyte interphase (SEI) film to protect the lithium anode in LOB with LiI/LiNO3/DMSO (dimethyl sulfoxide) electrolyte. The Li3PO4-protected Li anode exhibits excellent electrochemical stability during the Li stripping/plating process and leads to a relatively uniform and featureless surface in LOB after cycling. Our research demonstrates that superior electrochemical performance can be achieved in the Li–O2 battery with the synergistic combination of the DMSO-based electrolyte, the LiI redox mediator, and the Li3PO4-protected Li anode. The LOB with a Li3PO4-protected Li anode exhibits a prolonged cycling life span of 152 cycles with a fixed capacity of 1000 mA h g–1 at 2 A g–1. The results in this work provide knowledge for the development of a robust strategy for protecting the Li anode in the applications of Li–O2 batteries.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 20
·期 1
·1-8
·
IF 2.446
Zhong Haoxiang,Sun Minghao,Li Yong,He Jiarong,Yang Jianwen,Zhang Lingzhi
The polyacrylic latex (LA132) was firstly reported as a water-soluble binder for LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM) cathode in Li-ion battery. The electrochemical performances of NCM cathode with LA132 binder were investigated and compared with the conventional water-soluble sodium carboxymethyl cellulose (CMC) and commercial non-aqueous polyvinylidene difluoride (PVDF). NCM cathode with LA132 binder exhibited a much higher specific capacity of 146 mAh g −1 and capacity retention of 96.4 % after 100 cycles as compared with 122 mAh g −1 /88 % and 121 mAh g −1 /75% for the NCM electrode with CMC and PVDF, respectively. In addition, NCM cathode with LA132 binder exhibited better rate capability than that of CMC and PVDF, e.g., retaining 34.3 % capacity of C/5 at 5 C rate as compared with 28.5 and 10.9 % for CMC and PVDF, respectively.
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Nanoscale
·
2013
·Vol. 5
·期 16
·7564-7571
·
IF 6.233
Jie Sun,Haimei Liu,Xu Chen,David G. Evans,Wensheng Yang
Superposed cobalt(II)–cobalt(III) layered double hydroxide (CoII–CoIII-LDH) nanoplates were synthesized by an oil droplet template method, in which the main steps are as follows: LDH nanosheets were first assembled on an oil droplet template to form a multishell sphere, and then the oil droplet was easily removed under centrifugal force due to its very different density from that of the assembled LDH shell. This resulted in the multishell spheres being split open to create superposed LDH nanoplates. The resulting material has a three-stage architecture, namely, the primary building blocks of nanosheets, the secondary architecture of shells derived from the nanosheets, and the long-range architecture of superposed nanoplates assembled from the vertically stacked shells. Most importantly, the as-fabricated LDH-based hierarchical structure can be readily converted to a Co3O4/C composite via calcination, without obvious structural alteration, where the residual surfactant is the source of the carbon. When used as an anode material for Li-ion batteries, the Co3O4/C electrode exhibits an excellent electrochemical performance, which is attributed to the unique hierarchically porous structure.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Tao Li,Xue Bai,Yong-Xin Qi,Ning Lun,Yu-Jun Bai
Fe 3 O 4 has been regarded as one of the sustainable alternatives for anode materials of Li-ion batteries (LIBs), but the severe volume expansion and agglomeration of Fe 3 O 4 nanoparticles pose limitations to the lithium storage capability. In this paper, Fe 3 O 4 nanoparticles are loaded on the carbon derived from inner pomelo pericarp to form Fe 3 O 4 /C composite. Benefiting from the synergistic effect of the good electronic conductivity of the biochar and the high capacity of Fe 3 O 4 nanoparticles, the composite delivers a pronounced reversible capacity of 1003.3 mAh g −1 after 200 cycles at 100 mA g −1 , and reveals an impressive high rate capacity of 634.6 mAh g −1 at 500 mA g −1 with the capacity fading of 0.074% per cycle, suggesting the great potential as anode materials for LIBs. The mineral substances of uniformly distributed KCl and CaCO 3 in the biochar play an important role in enhancing the electrochemical performance of the composite.
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危险品化学品经营许可证（带存储）