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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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Junfang Cheng,Ziling Wang,Lu Zou,Ming Zhang,Guozhu Zhang,Yabin Dong,Yuexing Jiang,Yizhen Huang,Naotoshi Nakashima,Bo Chi
Perovskite oxides with low cost and high catalytic activity are reported as suitable cathode catalysts for the Li–O 2 batteries (LOBs), while their catalytic mechanism is not yet fully clarified. Herein, La 0.8 Sr 0.2 Co 0.8 Ni 0.2 O 3-δ (LSCN8282) perovskite oxide is used as a cathode catalyst for the LOBs and further improved by adjusting the Co/Ni ratio in the B-site. Thus, La 0.8 Sr 0.2 Co 0.6 Ni 0.4 O 3-δ (LSCN8264) and La 0.8 Sr 0.2 Co 0.4 Ni 0.6 O 3-δ (LSCN8246) are also synthesized and used as cathode catalysts for the LOBs. Among the obtained perovskite catalysts in this study, LSCN8264 shows the highest electrochemical activity in 1 M KOH and best catalytic effectivity when used in the LOBs. The catalytic mechanism and doping optimization are clarified by analyzing the morphology of the discharge products and the X-ray photoelectron spectroscopy (XPS) of the perovskite oxides.
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GREEN CHEMISTRY
·
2020
·Vol. 22
·期 14
·4473-4482
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IF 9.48
Shubin Wang,Zuotai Zhang,Zhouguang Lu,Zhenghe Xu
Deep eutectic solvents (DESs), as a green alternative technology, exhibit great potential to recycle valuable elements from spent lithium-ion batteries (LIBs). However, due to the weak reducing power of DESs, raising the temperature and extending the duration of processing are not efficient for screening suitable DESs for the recycling of LIBs. Here, we propose a novel, simple and robust experimental method to identify suitable DESs for recycling spent LIBs. Based on electrochemical principles, the method proposed in this study can be used to quickly determine the reducing power of DESs. As an example, a choline chloride (ChCl) and urea mixture as a DES was found to possess strong reducing power, with a Li and Co extraction efficiency of 95% from spent LIBs obtained at a reduced reaction temperature of 180 °C and reaction time of 12 h. The results are in good agreement with the results from Fukui functions calculations. The kinetic experiments revealed that the Li and Co extraction is controlled by solution and electron diffusion through the DES. Furthermore, a cubic cobalt oxide spinel (Co3O4) was obtained from the loaded DES using H2C2O4 and NaOH in the dilution–precipitation–calcination process. The current strategy demonstrates great potential for rapid and reliable screening of suitable DESs for the effective recycling of spent LIBs.
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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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CARBOHYDRATE POLYMERS
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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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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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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Peng Hei,Chaozhu Shu,Zhiqian Hou,Ruixin Zheng,Tingshuai Yang,Minglu Li,Zhiqun Ran,Yue Wang,Dexin Mei,Jianping Long
In this work, we fabricated a novel free-standing Fe doped CoP nanowire on carbon cloth (Fe–CoP/CC) electrode with high catalytic activity for Li–O 2 batteries. It is unexpected that the Li–O 2 battery with Fe–CoP/CC electrode demonstrated a low potential of 0.8 V and exceptional cycle stability of more than 500 cycles with no significant voltage attenuation compared with previously reported counterparts. Such excellent performance can be partly attributed to its fine nanowire structure and its large specific surface area (419.14 m 2 g −1 ). Furthermore, iron doping plays a crucial role in improvement of battery performance because the doped Fe can modulate the internal electronic structure and optimize the absorption of intermediate products, which have been proved to be the determinant for optimizing the catalytic activity. Thus, it is believed that heterogeneous element doping in binary or ternary metal compounds is a promising strategy to fabricate high performance oxygen electrode materials for Li–O 2 batteries in the next few years.
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Advanced Science
·
2022
·Vol. 9
·期 36
·2205069
·
IF 17.521
Yifan Wang,Zelong Qiao,Kexin Liu,Le Yu,Yingying Lv,Liyi Shi,Yin Zhao,Dapeng Cao,Zhuyi Wang,Shitao Wang,Shuai Yuan
The sluggish ion-transport in electrodes and low utilization of active materials are critical limitations of organic cathodes, which lead to the slow reaction dynamics and low specific capacity. In this study, the hierarchical tube is constructed by iron-hexaazatrinaphthalene tricarboxylic acid coordination polymer (Fe-HATNTA), using HATNTA as the self-engaged template to coordinate with Fe 2+ ions. This Fe-HATNTA tube with hierarchical porous structure ensures the sufficient contact between electrolyte and active materials, shortens the diffusion distance, and provides more favorable transport pathways for ions. When employed as the cathode for rechargeable Li-ion batteries, Fe-HATNTA delivers a high specific capacity (244 mAh g −1 at 50 mA g −1 , 91% of theoretical capacity), excellent rate capability (128 mAh g −1 at 9 A g −1 ), and a long-term cycle life (73.9% retention over 3000 cycles at 5 A g −1 ). Moreover, the Li + ions storage and conduction mechanisms are further disclosed by the ex situ and in situ characterizations, kinetic analyses, and theoretical calculations. This work is expected to boost further enthusiasm for developing the hierarchical structured metal-organic coordination polymers with superb ionic storage and transport as high-performance organic cathodes.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 20
·2777
·
IF 5.3
Zhenhua Feng,Chengwen Liu,Binbin Tang,Xiaojun Yang,Wenjie Jiang,Peng Wang,Xianjun Tang,Hongshan Wang,Xiangdong Zeng,Guangyong Zeng
Graphene oxide (GO) two-dimensional (2D) membranes with unique layer structures and tunable layer spacing have special advantages and great potential in the field of water treatment. However, GO membranes face the issues of weak anti-swelling ability as well as poor permeability. We prepared GO/Ti3C2TX2D composite membranes with 2D/2D structures by intercalating Ti3C2TXnanosheets with slightly smaller sizes into GO membranes. Ti3C2TXintercalation can effectively expand the layer spacing of GO, thereby substantially enhancing the flux of the composite membrane (2.82 to 6.35 L·m−2·h−1). Moreover, the GO/Ti3C2TXcomposite membrane exhibited a good Mg2+/Li+separation capability. For the simulated brine, the separation factor of M2 was 3.81, and the salt solution flux was as high as 5.26 L·m−2·h−1. Meanwhile, the incorporation of Ti3C2TXnanosheets significantly improved the stability of GO/Ti3C2TXmembranes in different pH environments. This study provides a unique insight into the preparation of highly permeable and ion-selective GO membranes.Keywords:graphene oxide;Ti3C2TXnanosheets;two-dimensional materials membrane;Mg2+/Li+separation
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Advanced Energy Materials
·
2023
·Vol. 13
·期 45
·2302443
·
IF 27.8
Kai Ding,Elijah J. Begin,Shouyi Yuan,Mingyang Zhong,Yang Wang,Yingjie Zhang,Xiaoyuan Zeng,Junwei Lucas Bao,Yonggang Wang
Given the high compatibility with Li metal anodes, ethereal electrolytes have found widespread use in Li metal batteries. Unfortunately, their applications in high-voltage Li metal batteries are hampered by a limited electrochemical window. In this study, a diluted ethereal electrolyte (with Li salt concentration < 1.5 m ) is developed containing 1 m lithium bis(fluorosulfonyl) imide (FSI) and 0.3 m LiNO 3 in a N -methyl- N -propylpiperidinium bis(trifluoromethanesulfonyl)imide (PP13TFSI):dimethyl ether (DME) (v:v = 1:4) mixture for Li metal batteries with an aggressive high-voltage cathode via the formation of an anion-enriched solvation sheath. In contrast to high-concentration electrolytes, the formation of the anion-enriched solvation sheath in this design is facilitated by the addition of ionic liquids. Further theoretical calculations indicate that the presence of FSI − and NO 3 − anions in the first solvation sheath weakens the desolvation energy of the DME solvent, suggesting a faster desolvation process at the electrode interphase. Consequently, the designed electrolyte enables long-term cycling of Li || LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) full cells over 1000 cycles at a high rate of 10 C. More notably, it also allows for a long cycle life of 100 cycles under a high rate of 5 C, even with limited negative capacity to positive capacity (N/P) ratio of 1.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Wen Zheng,Li Li,Yaobing Fang,Wenhui Yuan
The creation of innovative anodes to replace graphite in lithium-ion batteries (LIBs) is necessary to meet the rising demand for energy storage devices. Based on the large Li storage capacity, transition metal selenides (TMSs) draw considerable interest for LIBs. However, volume expansion of TMSs during the cycling process hinders their large-scale commercial application for LIBs. Herein, the NiSe 2 particle grown in situ on the porous carbon framework (NiSe 2 @C) is prepared by selenization of metal-organic frameworks (MOFs) in an argon atmosphere. NiSe 2 @C exhibits a high reversible Li storage capacity (770 mAh g −1 at 200 mA g −1 after 100 cycles), long cycling life (308 mAh g −1 at 1 A g −1 after 1000 cycles), and good rate capability (214 mAh g −1 at 5.0 A g −1 ). The long cycling performance can be attributed to the fact that NiSe 2 @C can withstand volume expansion during the Li + insertion and desertion process. Furthermore, cyclic voltammetry (CV) tests at various scan rates are conducted to investigate the kinetics of NiSe 2 @C for LIBs, indicating that the Li storage behaviour of NiSe 2 @C is primarily controlled by the capacitive process. The fabrication of the TMS@C composites by selenization of MOFs is a potential way to obtain anodes for high-performance Li storage.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Wei Le,Wanjun Zhao,Yanli Zhu,Xin Zeng,Dazhi Liu,Qingjie Jiao
Aluminum (Al)-lithium (Li) alloys are ambitious candidates for application in energetic materials, however, the high reactivity of Al-Li compound and Li in alloys affects their thermal stability, which results in gradually lower active content and diminished performance, impeding their further application in energetics. In this study, the specific content of silicon (Si) was introduced into Al-Li alloy via the centrifugal atomization that allows in-situ assembly of Al , Li, and Si at the single particle level, thus resulting in more stable Al-Li-Si compounds instead of active Al-Li compounds and Li and enhancing their thermal stability. The results show that Al-Li-Si alloy powders are in a high degree of sphericity, which are composed of αAl and AlLiSi. Compared to Al-Li alloys, Al-Li-Si alloys initiate the oxidization at a higher temperature (∼600 ℃) since the existence of more stable Al-Li-Si compounds than Li in Al-Li alloys, which indicates a higher thermal stability. Al-Li-Si alloys also show high heat release and combustion efficiency similar to Al-Li alloys. In the meanwhile, Al-Li-Si alloy-based composites maintain almost the same combustion properties compared to Al-Li/PTFE energetics, along with prolonged combustion duration. Therefore, Al-Li-Si alloy powders are promising candidates for application in energetic materials considering their higher thermal stability and tunable combustion properties.
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