ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Liang Tan,Yijin Wu,Deliang Cheng,Renzong Hu
High-capacity storage in Li-ion batteries with graphite anodes remains a challenge at low temperature. By contrast, metal-based composite anode materials, including Sn metal, have shown good lithium storage capabilities at low temperature. However, the suitable low temperature electrolyte is still infancy to achieve high efficiency capacity of Sn-based anode in ultra-low temperature. Herein, a 2-methytetrahydrofuran (2Me-THF)-based low temperature electrolyte is proven to support the excellent lithium capability of Sn-based anode at ultra-low temperatures. The formulated 2Me-THF electrolyte exhibited small changes in viscosity and ionic conductivity with decreasing temperature. A SnO 2 -LiF-G (graphite) electrode with 1 M lithium bis(trifluoromethanesulfonyl)imide-(2Me-THF) electrolyte maintained 80% of the room temperature reversible capacity at -30°C and delivered a reversible capacity of 650 mAh g −1 , even at -50°C, under a current density of 100 mA g −1 . Furthermore, a detailed characterization based on Fourier Transform Infrared Spectroscopy, X-ray Photoelectron Spectroscopy and Time-of-flight Secondary ion Mass Spectrometry confirmed that the formed inorganic-rich solid electrolyte interphase on the electrode surface effectively maintained the solid-liquid interfacial stability at low temperature. This work provided design concepts for ultralow temperature electrolytes for metal-based anodes, which were especially helpful for further promoting batteries for low temperature applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yang Han,Zhoujia Liu,Fenfen Zheng,Yixuan Bai,Zhiqian Zhang,Xiaogang Li,Weiwei Xiong,Junhao Zhang,Aihua Yuan
In this study, a novel flower-like Co-TCPP MOF/rGO composite has been successfully synthesized by combining cobalt meso-tetrakis(4-carboxyphenyl) porphyrin (Co-TCPP MOF) and reduced graphene oxide (rGO) via a simple one-pot solvothermal method. The introduction of rGO not only reduces the stacking of MOF effectively, but also facilitates the formation of a continuous conductive network composed of entangled graphene and Co-TCPP MOF in favor of rapid electron transport. More importantly, the ultrathin lamellar structure of Co-TCPP MOF/rGO composite nanosheets could expose more active sites, reduce the diffusion distance of Li + to the internal electroactive sites, and improve the overall electrical conductivity of the electrode due to their sufficient contact with carbon. When evaluated as anode materials for lithium-ion batteries, the flower-like Co-TCPP MOF/(15 wt%)rGO composite electrode delivers a specific capacity of 1050 mAh g −1 at 100 mA g −1 after 100 cycles. A specific capacity of 650 mAh g −1 can be remained after 300 cycles even at 1000 mA g −1 . The superior performance of the Co-TCPP MOF/(15 wt%)rGO composite electrode could be attributed to the introduction of rGO, which prevents the stacking growth of Co-TCPP MOF crystals along the horizontal direction and improves the electrical conductivity.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wei Zeng,Xiaojia Zhang,Chunyang Yang,Chengzhi Zhang,Huimin Shi,Jin Hu,Yanli Zhao,Wenjing Zhang,Guanhua Zhang,Huigao Duan
Alkali metal anodes are promising anodes for constructing novel battery systems with high energy density. Nevertheless, limited nucleation sites and nonuniform local electric field caused dendrites growth and unlimited volume expansion hindered their practical implementation during electrochemical plating/stripping. Herein, a 3D N-doped carbon nanofiber skeleton wrapped with Ni nanoparticles encapsulated carbon nanotubes (CNTs-Ni@NCFs) is prepared by hydrothermal process and followed catalytic reaction under ethanol atmosphere to construct a superior Li/Na-philic host with stable chemical properties. The 3D NCF networks serve as a primary framework, providing sufficient voids for alkali metal deposition and rapid electron and ion transport. The Li/Na-philic Ni nanoparticles and catalyzed CNTs on CFs provide evenly distributed nucleation sites and uniform local electric field, leading to dendrite-free Li deposition, which is confirmed by theoretical calculations. Because of the guided deposition behavior and bare volume change, the CNTs-Ni@NCFs anode delivers an extremely low nucleation overpotential in the initial deposition and a superior plating/stripping voltage hysteresis under a high current density of 30 mA cm −2 for 300 cycles. The CNTs-Ni@NCFs-Li full cell with LiFePO 4 cathodes demonstrates 94.2% capacity retention after 200 cycles under 2 C. When coupled with Na 3 V 2 (PO 4 ) 3 cathode, the CNTs-Ni@NCFs-Na cell shows a good suitability in full cell. This work shed new light on fabricating novel stable alkali metal anodes, which may also pave the way toward to other practical applications with high energy densities, such as in Li-air and Li-S batteries, etc .
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Science China-Technological Sciences
·
2021
·Vol. 65
·期 2
·272-281
·
IF 3.572
Meng FanCheng,Xu Bin,Long Tao,Cheng Sheng,Li Yong,Zhang YongYi,Liu JieHua
Conductive carbon structure has been considered as a promising sulfur-hosting material as the cathode of lithium-sulfur batteries. However, the issue of polysulfide shuttling requires an additional component to help restrict and convert sulfur substances. Herein, in this work, hollow and porous carbon nanospheres (HCS) are synthesized by a template method and a high-temperature carbonization treatment. A thin layer of ZnS coating is then deposited on the HCS-based sulfur (ZnS@HCS/S) cathode with controlled thickness, and the overall electrochemical properties are systematically evaluated. Results show that with 30 nm-thick ZnS coating, the cathode reveals an improved capacity of 1411 mA h g −1 , and higher capacities from 0.2 to 3 C rate compared with bare HCS/S cathode. Moreover, the ZnS coating also enhances the cycling stability of ZnS@HCS/S cathode over 280 cycles at 0.5 C, with only 0.2% capacity decay per cycle. This work demonstrates potential applications for high-performance lithium-sulfur batteries.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jia-Wei Fang,Jing Wang,Zhi-Yong Ji,Jia-Li Cui,Zhi-Yuan Guo,Jie Liu,Ying-Ying Zhao,Jun-Sheng Yuan
Improving the cycle stability and Li + electrosorption rate of the LiMn 2 O 4 (LMO) film electrode in the selective Li + electrosorption process is still a considerable challenge. In this work, a novel polypyrrole (PPy) - derived carbon encapsulated material LiMn 2 O 4 @Carbon/Nitrogen-4 (LMO@CN-4) was prepared by the three-dimensional in-situ polymerization and high-temperature annealing of PPy on the LMO surface. The LMO@CN-4 film electrode showed a faster Li + electrosorption rate, higher lithium-ion selectivity, and higher stability than the LMO film electrode. The maximum capacity of the LMO@CN-4 film electrode for Li + could reach 34.57 mg/g within 40 min in 0.05 mol/L LiCl solution. Even in the simulated concentrated seawater with a low Li + concentration (0.17 g/L), it could quickly reach adsorption equilibrium and maintain the high selectivity of Li + . The adsorption capacity was about 37.14 mg/g and the separation coefficient of α (Li + /Mg 2+ ), α (Li + /Na + ), and α (Li + /Ca 2+ ) was about 228.25, 2110.64, and 1381.89. The carbon encapsulation served as a conductive layer to enhance charge and ion transport. It also provided a buffer layer to prevent the volume collapse of the crystal and the dissolution of Mn. Therefore, the charge and discharge capacity of the LMO@CN-4 film electrode could be maintained at about 80% after 50 cycles at the 1C (148 mAh/g) rate, which was 20% higher than that of the bare LMO. What’s more, the high cycle stability and Li + electrosorption rate of the modified film electrode also suggested its potential for lithium electrosorption from concentration seawater.
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ACS Nano
·
2020
·
IF 14.588
Xiaoxiang Fan,Ruming Yuan,Jie Lei,Xiaodong Lin,Pan Xu,Xueyang Cui,Lin Cao,Mingsen Zheng,Quanfeng Dong
The shuttle effect of dissolved polysulfides produced during the operation of lithium–sulfur batteries is the most serious and fundamental problem among many challenges. We propose a strategy via in situ formation of a functionalized molecule with a dual-terminal coupling function to bind the dissolved polysulfide intermediates, thus turning them back into solid-state organopolysulfide complexes by molecule binding, and then the polysulfides can be pinned on the cathode firmly. The dual-terminal coupling functional molecule binder (MB), which is formed in situ by reaction between quinhydrone (QH) and lithium, can not only bind polysulfides by reversible chemical coordination but also promote the conversion of polysulfides during cycling synchronously. In theory, with the dual-terminal coupling function, MB can bind polysulfide intermediates to copolymerize them, forming −[MB-Li2Sn]– that has faster reaction activity and redox conversion kinetics in comparison with simple Li2Sn. With the MB, the Li–S battery exhibits a large initial capacity of 1347 mAh g–1 at 0.1 C. The remaining capacity of 963 mAh g–1 at 1 C shows no obvious decay for more than 400 cycles, and the retention of the first 300 cycles can reach 96.9%, in particular. This study delivers an alternative approach to resolving the shuttle effect and achieving excellent Li–S battery performance, with the potential significance going way beyond battery systems.
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 39
·2003800
·
IF 16.836
Weidong Zhang,Zeyu Shen,Siyuan Li,Lei Fan,Xinyang Wang,Fang Chen,Xiaoxian Zang,Tian Wu,Fuyuan Ma,Yingying Lu
Fast Li-metal depletion and severe anode pulverization are the most critical obstacles for the energy-dense Li-metal full batteries using thin Li-metal anodes (<50 µm). Here, a wavy-nanostructured solid electrolyte interphase (SEI) with fast ion transfer kinetics is reported, which can promote high-efficiency Li-metal plating/stripping (>98% at 4 mAh cm −2 ) in conventional carbonate electrolyte. Cryogenic transmission electron microscopy (cryo-TEM) further reveals the fundamental relationship between wavy-nanostructured SEI, function, and the electrochemical performance. The wavy SEI with greatly decreased surface diffusion resistance can realize grain coarsening of Li-metal deposition and exhaustive dissolution of active Li-metal during the stripping process, which can effectively alleviate “dead Li” accumulation and anode pulverization problems in practical full cells. Under highly challenging conditions (45 µm Li-metal anodes, 4.3 mAh cm −2 high capacity LiNi 0.8 Mn 0.1 Co 0.1 O 2 cathodes), full cells exhibit significantly improved cycling lifespan (170 cycles; 20 cycles for control cells) via the application of wavy SEI.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 5
·7120-7128
·
IF 3.741
Menglu He,Jia Jia,Qing Sun,Weixin Zhang
SUMMARY Li-O 2 battery has attracted much attention due to its ultra-high theoretical energy density in the field of electrochemical energy storage. The introduction of efficient electrocatalyst can effectively accelerate the reaction rate of ORR and OER, so as to improve the coulomb efficiency and poor cycle stability of Li-O 2 battery. In this work, a novel hollow N-doped carbon sphere is prepared by using MOF and polystyrene as template, and act as highly efficient oxygen electrocatalyst for rechargeable Li-O 2 batteries. The hollow structure can provide enough oxygen diffusion channel, deposition and decomposition space for reduction products. N doping into the hollow carbon structure can increase the charge density of adjacent carbon atoms and enhance its catalytic activity of ORR/OER. As a result, the Li-O 2 battery using the hollow N-doped carbon sphere as air cathode exhibited an high specific capacity of 18 762 mAh/g (at a current density of 500 mA/g) and remarkable cycling stability of 212 cycles (at a current density of 500 mA/g and limited capacity of 1000 mAh/g), outperforming the carbon material with common structure. This work highlights the importance of air cathode structure and efficient catalyst, provides a new idea for the design of air cathode of Li-O 2 battery, and expands the scope of future research.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 35
·18338-18347
·
IF 11.301
Rong Shao,Feng Zhu,Zhenjiang Cao,Zhengping Zhang,Meiling Dou,Jin Niu,Baoning Zhu,Feng Wang
Fabricating a silicon–carbon (Si/C) hybrid material is a powerful strategy to enhance the Li-ion storage capacity of Si-based anodes. However, because additional binders and conductive agents need to be incorporated in the final anodes, the resulting Si/C materials generally have poor areal capacities, limiting their practical applications. In addition, the heteroatom effects of carbon modifiers on anode performance and the modification mechanism still need to be explored. In an attempt to overcome these limitations, we have prepared flexible Si/C anodes by an efficient method using commercial Si nanoparticles and three polymers as precursors. By simple slurry coating followed by low-temperature pyrolysis, the resulting polymer-derived carbons with different heteroatom dopants form continuous conductive networks and simultaneously anchor Si nanoparticles on copper foil, affording Si/C anodes with good performance. Material characterization, electrochemical tests and first-principles calculations show that N doping facilitates charge transfer and ion diffusion within Si/C anodes. More importantly, N, O co-doping improves the mechanical strength of Si/C anodes via double-interface bonding, thus efficiently accommodating the volume expansion of Si/C anodes. As a result, a Si/C anode prepared using a chitosan precursor (Si@CTSC) exhibits the best half-cell performance among all the anodes tested. Moreover, the Si@CTSC anode can be used to assemble a pouch cell with a LiCoO2 cathode, which shows an ultrahigh energy density of up to 540 W h kg−1 (based on the total weight of the electrode materials) and good bending flexibility, increasing the possibility of practical applications of Si/C anodes in advanced Li-ion batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Chao Wang,Yinghui Yang,Dujiang Lu,Rongzhang Guan,Junzhang Wang,Xiufang Bian
For the first time, wok ash (W-A) is exploited to be an anode material for lithium-ion batteries (LIBs). It contributes to the elimination of obstacles that appear on the commercial progress of silicon (Si) anodes. Herein, a composite of W-A, carbon nanotubes (CNTs) and commercial Si nanoparticles , denoted as C 1 Si 2 @W-A 2 , is designed and fabricated, which is synthesized by simply one-step ball milling. To coordinate with Si, W-A’s nanoporous structure alleviates volume expansion during the lithiation/delithiation process. Interestingly, owing to the existence of multiple oxides in W-A, the capacity of the whole electrode increases after several cycles. As a result, the optimized C 1 Si 2 @W-A 2 can deliver a capacity of 1528.8 mA h g −1 after 100 cycles at a current density of 100 mA g −1 and earn a decent rate performance. In addition, the energy storage mechanism is explored by quantitative kinetics analysis and proven to be a capacitance-battery dual model. Hopefully, favorable electrochemical performance and low-cost make C 1 Si 2 @W-A 2 a potential candidate for LIBs anode, paving the way for the commercialization of Si nanoparticles.
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MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Zhen Xiao,Yao Li,Wenkui Zhang,Hui Huang,Yongping Gan,Jun Zhang,Chu Liang,Qinzhong Mao,Peng Liao,Yanxian Jin,Yang Xia
Originating from the severe polysulfide dissolution and notorious polysulfide shuttle, the practical applications of lithium-sulfur (Li-S) batteries confront huge challenges in low active material utilization, rapid capacity degradation, short cycling lifespan, and inferior rate capability. Herein, a rationally modified polypropylene (PP) separator with multi-functional nickel hydroxide@carbon nanotube (NiOOH@CNT) coating layer is proposed to overcome these critical obstacles. The conductive and porous CNT networks ensure the rapid electron/ion transport to achieve high reactivation and reutilization of active materials, as well as physically block the polysulfide migration. Meanwhile, the porous NiOOH nanowalls arrays layer with polar surface demonstrates superior chemical absorption ability for anchoring polysulfides, thereby significantly suppressing the shuttle effect. Such elaborately designed separator endows Li-S batteries with high specific capacity, superior capacity retention and remarkable rate capability. This work sheds new light on the multi-functional separators for high-performance Li-S batteries.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Feng Yu,Hongbing Zhang,Lingzhu Zhao,Zhipeng Sun,Yuli Li,Yan Mo,Yong Chen
With the advent of gel polymer electrolyte (GPE), a series of safety problems of lithium ion batteries have been resolved. However, poor self-standing property, the low ionic conductivity and Li + transference number are still the obstacles that impede the practical application of GPE. Herein, a flexible and eco-friendly GPE is designed using allyl-modified cellulose with methylcellulose through simple UV curing. The crosslinked structure facilitates the integrity of GPE during use, and methylcellulose guarantees the high affinity to liquid electrolyte and improve interfacial compatibility. The specific polar functional groups ( OH, OCH 3 and C O C ) in GPE cooperate to enhance the lithium salt dissociation, anion immobilization and lithium ion transporting and enable the high Li + transference number (0.902) and ion conductivity (4.36 × 10 -3 S cm -1 ). The assembled Li/GPE/LiFePO 4 coin cells possess high initial discharge capacity of 150.6 mA h g -1 and a high capacity retention of 91.6 % after 100 cycles.
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