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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PubMed
高影响因子
ACS Applied Energy Materials
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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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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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高影响因子
Polymers
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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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高影响因子
ACS Sustainable Chemistry & Engineering
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2018
·
IF 6.14
Kunlei Zhu,Yufeng Luo,Fei Zhao,Jiwei Hou,Xuewen Wang,He Ma,Hui Wu,Yuegang Zhang,Kaili Jiang,Shoushan Fan,Jiaping Wang,Kai Liu
Flexible and durable electrode materials are of vital importance to developing advanced energy storage devices for emerging wearable electronics. Most current strategies adopt chemical modifications or chemical binders to improve the interface interaction between flexible components, which inevitably lowers the cyclic lifetime and increases the production cost. Here, we report an in situ, scalable sol–gel method to fabricate free-standing TiO2/superaligned carbon nanotube (SACNT) hybrid films as flexible anodes in Li-ion batteries. The natural and desirable wettability between TiO2 and SACNTs makes any chemical modifications or chemical binders unnecessary in the fabrication process, delivering a clean TiO2–SACNT interface. The as-prepared TiO2/SACNT anodes not only inherit the high flexibility of the SACNT framework but also enhance rate capability and charge/discharge reversibility with its pseudocapacitive storage mechanism. These anodes exhibit a high capability and a long cyclic lifetime (over 1000 cycles at 60 C) in half cells. They are further assembled to make flexible full cells, where binders, conductive agents, and current collectors are all unnecessary. The capacity decay of a full-cell test is almost negligible over 500 cycles of bending with a fast charging rate within 50 s, suggesting TiO2/SACNT films to be a promising material for flexible storage devices.
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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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高影响因子
RSC Advances
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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
RESEARCH ON CHEMICAL INTERMEDIATES
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2019
·Vol. 45
·期 10
·4959-4973
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IF 2.064
Fu Lixin,Shi Liyi,Wang Zhuyi,Zhu Jiefang,Zhao Yin,Yuan Shuai
Abstract In this paper, a simple and feasible method for preparing gel polymer electrolyte (GPE) with good ionic transport properties and mechanical stability is proposed. A ZrO 2 /KH570/PU/P123 layer was formed on the outer and inner pore surfaces of PE separator before in situ polymerization by a simple one-step dipping coating process. This coating layer changes the PE separator surface from hydrophobic to hydrophilic, and therefore facilitates the uniform spreading of the GPE precursor solution on the PE surface to enable the formation of highly uniform GPE. Moreover, it effectively compensates the negative effects of in situ gelatinization on the ionic transport behavior of the final PE-supported GPE. This GPE possesses excellent ion transport properties and mechanical stability, as well as improves the static and dynamic interfacial stability with lithium metal anode. When using metallic lithium and LiCoO 2 to assemble cells, this PE-supported GPE affords improved C-rate capability, cycling performance and effective dendrite inhibition. Graphic abstract
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高影响因子
Journal of Materials Chemistry A
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2019
·Vol. 7
·期 39
·22377-22384
·
IF 10.733
Weishang Jia,Zihao Wang,Jingze Li,Xiqian Yu,Yifan Wei,Zeyu Yao,Yuchi Liu,Ying Wang,Aijun Zhou,Wei Zou,Fu Zhou,Hong Li
The growth of lithium (Li) dendrites hinders the application of Li metal anodes in rechargeable Li batteries. Herein, a dual-phase alloy of Li–Ca is proposed to replace Li metal as an advanced anode, which is composed of a Li metal phase and a CaLi2 alloy phase. The three dimensional (3D) CaLi2 alloy framework forms regular patterns via phase segregation while cooling down the molten Li–Ca alloy in a facile one-step fusion fabrication process, where pattern shape and mechanical stability change with the atomic ratio of Ca to Li. The porous CaLi2 alloy framework is functionalized as a lithiophilic current collector in the lithiation process, featuring enhanced structural stability and suppressed Li dendrite growth. Consequently, the electrochemical performance of a dual-phase Li–Ca alloy anode with microsized patterns is significantly improved with a Li metal phase as the reservoir providing reversible capacity. This dual-phase Li alloy with a regularly arranged 3D lithiophilic framework provides a new solution for lithium metal batteries.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yang Wang,Jingyun Huang,Jianguo Lu,Bin Lu,Zhizhen Ye
The shuttling effect of soluble polysulfide in electrolyte has been the major obstacle resulting in the poor cycling stability of Li–S battery. The ultrathin ZrB 2 /graphene oxide/carboxymethocel (ZrB 2 /GO/CMC) layer coated onto cathode via simple doctor blade method has been developed as the effective polysulfide shuttling barrier. Owing to typical 2D scaffold and abundant functional oxygen groups，the GO can provide physical defender as well as chemical trap against polysulfide shuttling. The introduction of conductive ZrB 2 nanoparticles in the hybrid layer can not only improve the conductivity of hybrid layer dramatically reducing electrochemical polarization of Li–S battery without adding other conductive agent but also further form chemical shield by chemisorption which is firstly confirmed by experimental and theoretical calculations. Combining these merits, the ultrathin ZrB 2 /GO/CMC hybrid layer combining with CNT@S hybrid cathode enables the Li–S battery to achieve good rate performance (769 mAh g −1 at a rate of 2 C) and stable cycling capability (with a low capacity decay rate of 0.098% during 300 cycles at 1 C). Specifically, the Li–S battery shows the potential of practical application, with high areal S loading of 5.1 mg cm −2 , delivering the capacity near-commercial lithium-ion battery.
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高影响因子
Energy Storage Materials
·
2017
·
IF 0
Feilong Qiu,Xiaoyu Zhang,Yu Qiao,Xueping Zhang,Han Deng,Tianrui Shi,Ping He,Haoshen Zhou
Li metal is used as anode for Li–O 2 batteries because of its high specific capacity and low negative electrochemical potential. However, Li metal exhibits low Coulombic efficiency and limited cycle life, which hinder its practical use. In this study, we demonstrate that the performance of the Li metal anode was significantly improved by cycling in O 2 -rich electrolyte. In the presence of sufficient O 2 , the growth of Li dendrites was suppressed by the formation of flexible and mechanical strong solid electrolyte interphase layers. Consequently, Li metal anode remained stable over 800 cycles with 98.7% Coulombic efficiency. The origination of the superior performance was further analyzed through ion etching-assisted XPS and in situ electrochemical Raman spectroscopy . Our research provides a distinct and effective approach used to improve the stability and reversibility of Li metal anodes and reveal the superiority of Li metal systems in the presence of sufficient O 2 for Li-O 2 battery.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jing Wang,Jian Hao,Xiao Yang,Ruyi Zhang,Junli Guo,Yu Zhao,Jianing Chen,Caixia Chi
In order to overcome the problems about the volume expansion and poor electronic conductivity of Si , a flexibility and rigidity double coating layer CNTs-rGO- PAIN was constructed. The CNTs-rGO-PANI network with porous structure and high electronic conductivity provides sufficient space to accommodate the volume change of Si, and abundant transmission path for electron and Li ion . Moreover, the coating network with flexibility and rigidity characteristic could absorb the expansion stress of Si, maintain electrode structural integrity, promote the growth of stable SEI . The polymer-nanocarbon network dual coating layer effectively safeguards the electrochemical-mechanical interplay within the electrode. The 20Si-CNTs-rGO-PANI exhibits a reversible capacity as high as 1856 mAh g −1 after 400 cycles at 0.2 A g −1 and a remarkable rate capacity of 570 and 459 mAh g −1 , at 5 and 10 A g −1 , respectively. The outstanding Li ion storage performance of 20Si-CNTs-rGO-PANI anode, suggests the flexibility-rigidity dual coating layer strategy is a potential way to improve the performance of alloy type anode .
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高影响因子
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