JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Tao Huang,Xiangzhen Zheng,Chunfeng Yan,Ying Pan,Maoxiang Wu
1,3-Divinyltetramethyldisiloxane (DTMS) is a multifunctional additive that is used to improves the cycling stability and capacity retention of Li-rich Mn-based layered oxide cathodes (LRMs). Cycling performance evaluations demonstrate that LRM/Li cells without the additive exhibit lower capacity retention. DTMS can significantly improve the capacity retention of LRM/Li cells from 42.8% to 75% at 0.5C. Theoretical calculations indicate that DTMS is preferentially oxidized on the LRM surface. Physical characterization results reveal that DTMS generates a layer on the LRM surface that is both less resistive and thinner than the LRM by reacting with HF/F − from the electrolyte. This DTMS-derived layer inhibits adverse reactions between the cathode and electrolyte, thus, effectively maintaining the cathode structure.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhenyuan Hu,Feng Ji,Yunfeng Zhang,Wenfan Guo,Xiao Jing,Wei Bao,Jinpeng Qin,Shikang Huo,Shenghan Li,Yi Zhang,Weizhen Fan,Hansong Cheng
Solid polymer electrolytes (SPEs) significantly improve the operational safety of lithium-metal batteries (LMBs) by replacing the flammable liquid electrolytes, but still suffer from key limitations including low ionic conductivities, inferior lithium-ion transference numbers ( t L i + ), and poor mechanical properties. Herein, a novel poly (ethylene oxide) (PEO)-based composite electrolyte, with a semi-interpenetrating polymer network, is fabricated via in-situ cross-linking siloxane-type single-ion conductors (SICs) in PEO SPEs by one-step sol–gel method, enabling they simultaneously achieve the enhanced electrochemical and physicochemical properties. Incorporating a thermodynamically compatible SIC network not only reduces the crystallization of PEO matrix while facilitating the segmental relaxation of polymer chains, but also contributes to dissociating Li-salt and forming a three-dimensional conducting network for fast Li-ion transport. Thus, the resulting composite SPEs exhibit higher ionic conductivities (1.10 × 10 −5 S cm −1 at 25 °C and 1.41 × 10 −4 S cm −1 at 60 °C), t L i + (0.52), and electrochemical window stability (4. 59 V) than pure PEO SPEs. Furthermore, this stable SIC networks can also enhance the mechanical performance and thermal stability of the composite SPEs. Thanks to these merits, the composite SPEs show the significant feasibility to regulate Li deposition and suppress the growth of Li dendrites, affording excellent stability and compatibility with Li metal. As a result, the Li/Li symmetrical cells using the composite SPEs show excellent cycling performances without an evident polarization enlargement for more than 900 h. The LiFePO 4 /Li batteries also achieve a remarkable capacity of 132.8 mA g −1 at 1C and exhibit impressive cycling abilities with 91.9% retention over 250 cycles. This study provides a promising concept for developing advanced composite SPEs for potential application in solid-state dendrite-free LMBs.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xiaodong Liu,Guanyu Li,Feng Wu,Cunzhong Zhang
Lithium metal batteries (LMB) have received widespread attention due to their high energy density and potential commercial value. The relationship between the rate performance, cycling performance, microstructure of the deposition layer, and SEI of lithium anodes has not yet been elucidated. Here, we investigated the cycling performance and rate characteristics of metal lithium anodes in classic carbonate electrolytes containing different supporting salts. And the microstructure and chemical information of the lithium anode surface were analyzed. In addition, microelectrode technology was used to study the dynamic behavior and reaction of electroplating/stripping lithium process under different polarization conditions (current density), revealing the apparent performance, microscopic visual information, and dynamic causes and mechanisms of SEI. The results indicate that in carbonate electrolytes containing LiBOB and LiPF 6 , the cycling performance of lithium anodes, the microstructure of the deposition layer, and SEI can be significantly improved. Microelectrode research has revealed a close causal relationship between the stability and coordination of each basic step, including lithium ion mass transfer, interface charge transfer, and surface crystallization kinetics parameters , and the apparent performance of lithium anodes. This correlation can serve as a dynamic evaluation basis for future selection and optimization of operating and manufacturing conditions.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 24
·10849-10861
·
IF 7.79
Shunyou Hu,Yuanyuan Hu,Xiangli Liu,Jiaheng Zhang
Lithium–sulfur (Li–S) batteries generally suffer from a serious “shuttle effect” during the charging/discharging process, resulting in the loss of active components and sluggish redox reaction kinetics that hinder the cycle life and rate performance of the battery. To address this, CoSe/C hollow structures (CoSe/C HSs) were prepared via a simple hydrothermal strategy and used as a sulfur host for Li–S batteries. The battery with CoSe/C HSs exhibited a high initial specific discharge capacity of 1405 mA h g−1 with a coulombic efficiency of 99.8% at 0.1C. Additionally, S@CoSe/C HS cathodes with a high sulfur loading of 5.1 mg cm−2 delivered a considerable specific discharge capacity of 1256.1 mA h g−1 and maintained a high capacity of 1120 mA h g−1 after 100 cycles with a capacity decay rate of 0.11% per cycle at 0.1C. The unique raspberry-like structure of CoSe/C HSs prevents polysulfides from escaping the cathode host via both physical containment and the formation of Co–S and Se–Li chemical bonds, and it also enhances the polysulfide redox kinetics. Furthermore, the peculiar raspberry-like structure can withstand volume changes during charging/discharging to better protect the cathode.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2021
·
IF 9.594
Yuchen Wang,Yunhong Wei,Boya Wang,Peng Jing,Yin Zhang,Yun Zhang,Qian Wang,Hao Wu
Developing high-energy-density lithium-sulfur batteries (LSBs) heavily depends on the rational design of cathodes in order to address the key challenge on suppressing the notorious polysulfide shuttling, particular in high-sulfur-loading electrodes. Herein, a unique hierarchical porous N-doped carbon nanofiber architecture with in-situ generated iron carbide nanocatalysts (Fe 3 C@PCNFs) is delicately designed by using natural collagen fibers as the precursor matrix and the structure-directing agent, which can be applied as an advanced sulfur host in LSBs. Benefiting from the thermal-induced etching by ferric species combined with ZrO 2 hard-template management, such transformed Fe 3 C@PCNFs framework exhibits enhanced graphitization degree, impressive hierarchical porous architecture, and high specific surface area near 1300 m 2 g −1 . The in-situ embedded polar Fe 3 C nanoparticles are proved to possess excellent chemical adsorption and catalysis effect toward the immobilization-conversion of polysulfides and fast Li 2 S nucleation. Thus, a target cathode (S–Fe 3 C@PCNFs) with >76 wt% sulfur content can deliver outstanding rate capability (632 mAh g −1 at 5C) and superb cycling performance (∼0.067% capacity decay per cycle over 500 cycles). Impressively, when applied with high-areal-loading of 6.3 mg cm −2 , the S–Fe 3 C@PCNFs still exhibits a stable cycling life together with a significant high areal capacity of 5.0 mAh cm −2 , manifesting a promising application in practical LSBs.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 23
·13839-13847
·
IF 3.361
Guan-Zhong Wang,Yao Liu,De-Bin Ji,Ling-Yue Zhu,De-Qiang Ji,Dan-dan Yuan,Mi-Lin Zhang,Hong-Jun Wu
Mg–Li based alloys have been widely used in various fields. However, the widespread use of Mg–Li based alloys were restricted by their poor properties. The addition of rare earth element in Mg–Li can significantly improve the properties of alloys. In the present work, different electrochemical methods were used to investigate the electrochemical behavior of Y(III) on the W electrode in LiCl–KCl melts and LiCl–KCl–MgCl2 melts. In LiCl–KCl melts, typical cyclic voltammetry was used to study the electrochemical mechanism and thermodynamic parameters for the reduction of Y(III) to metallic Y. In LiCl–KCl–MgCl2 melts, the formation mechanism of Mg–Y intermetallic compounds was investigated, and the results showed that only one kind of Mg–Y intermetallic compound was formed under our experimental conditions. Mg–Li–Y alloys were prepared via galvanostatic electrolysis, and XRD and SEM equipped with EDS analysis were used to analyze the samples. Because of the restrictions of EDS analysis, ICP-AES was used to analyze the Li content in Mg–Li–Y alloys. The microhardness and Young's modulus of the Mg–Li–Y alloys were then evaluated.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ning Xu,Shiwei Mei,Zhangxin Chen,Yujie Dong,Weijun Li,Cheng Zhang
It is the hot issue for Li-organic battery that whether the higher specific surface area of the porous organic polymers as the electrode materials can benefit to the better battery performance. In this article, the conjugated polymer based on star-shaped benzene-thiophene structure (pBHT) and benzene-ethynyl-thiophene structure (pBAT and pBABT) were designed and successfully prepared. The pBHT polymer exhibits the unique stacked hollow tube morphology and possesses the high surface area (~1139 m 2 /g), while the polymers pBAT and pBABT both display the macroporous morphology with the low surface area (32.5 m 2 /g and 12.5 m 2 /g). Being explored for the battery performance as anode materials, the pBHT electrode exhibits a very low discharge capacity (<100 mAh g −1 ) and poor cycle’s stability. In contrast, the pBABT electrode with very low surface area of only 12.5 m 2 /g displays the higher discharge capacity (442 mAh g −1 at 500 mA/g of the second cycle), excellent stability (401 mAh g −1 at 500 mA/g of the 1000 cycles) and higher rate capabilities. These uncommon electrochemical properties may be attributed to the unique hollow tube morphology for the polymer pBHT, which limit the lithium ion released and might form “dead lithium”, thus resulting in the collapse of polymer structures and difficult solid electrolyte interface formation, as well as the fast capacity fading and extremely low capacity according to the electrochemical behaviors and SEM measurements. EIS also confirm the uncommon electrochemical properties with the three polymer electrodes from the kinetics for charge carrier insertion/extraction. Our findings may offer a clue to explore the effect of specific surface area and morphology of polymer electrodes on the performance of LIBs when designing the high-performance electrode materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Ying Wang,Dan Li,Siqi Zhang,Ziye Kang,Haiming Xie,Jia Liu
Although dual redox mediators (RMs) largely promote the discharge capacity and decreases the charge overpotential in Li-O 2 batteries , the shuttle effect leads to a RM degradation and a serious deterioration of Li metal, which results in a poor sustainability. Here, a poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) -decorated separator has been firstly introduced into a dual mixture RMs-involved Li-O 2 system, which restrains the shuttle effect via coulombic interactions. Benefiting from the advantages of as-prepared separator, a cell exhibits an enhanced cycling stability and a good reversibility associated with the Li 2 O 2 formation and decomposition during cell cycling. These results represent a promising progress in the development of an easy-to-operate modified separator for a highly efficient Li-O 2 battery.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 37
·6518-6525
·
IF 3.545
Qi-Ming Qiu,Guo-Yu Yang
Three new mixed-alkaline-metal borates, namely KNa8[Li@B12O18(OH)6](CO3)2 (1), Cs10[Li@B12O20(OH)2]2·6H2O (2) and Cs5[Li@B12O20(OH)2]·3H2O (3), have been synthesized under hydro/solvothermal conditions. Compound 1 is a borate carbonate with the isolated [Li@B12O18(OH)6]5− clusters and interesting layers formed by Na+ and CO32− ions, forming a 2D supramolecular structure with a 3,6-connecting binodal system. After changing the synthetic conditions, the isolated [Li@B12O18(OH)6]5− clusters are successfully extended to the layers in 2 and 3 by condensation reactions with the elimination of water molecules between oxoboron clusters. Each new fundamental building block [Li@B12O22(OH)2]9− in 2 and 3 connects with four neighboring units to form a 2D layer via B–O–B bonds for the first time, and 14-membered rings are also observed. Such a layer structure is first observed in dodecaborates. Since compound 3 crystallizes in the non-centrosymmetric space group, the second harmonic generation measurement and the dipole moments calculation have been carried out.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 36
·19996-20007
·
IF 4.22
Zhang Chao,Yan Jun,Song Rui,Chen Lei,Liu Yong
Porous carbon nanofibers (PCNFs), are widely used as free-standing anode materials for lithium-ion batteries (LIBs), due to their high specific surface area and excellent ion diffusion kinetics, but they also present problems of reduced rate performance and cycling performance, due to poor strength caused by porosity. Herein, a novel surface porous carbon nanofiber (SPCNFs) is prepared by coaxial electrospinning, followed by carbonization. All the pores are distributed in the shell of the fibers, with a dense amorphous carbon structure in the core, which would not only provide abundant lithium-ion embedding sites, and accelerate the penetration of electrolyte ions, but also alleviate the reduction of mechanical properties (with a ~ 30% improvement to PCNFs). Consequently, our LIBs assembled with this SPCNFs anode represent remarkable cycling stability (445.33 mAh g −1 at 100 mA g −1 after 100 cycles and 388.92 mAh g −1 at 1 A g −1 after 1000 cycles), and excellent rate capacity (317.55 mAh g −1 at 1 A g −1 ).
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Baoyu Sun,Shuaifeng Lou,Zhengyi Qian,Pengjian Zuo,Chunyu Du,Yulin Ma,Hua Huo,Jingying Xie,Jiajun Wang,Geping Yin
Transition metal oxides are regarded as the promising anodes for lithium ion batteries owing to the high theoretical capacities. However, the mechanical and electrochemical degradations severely reduce the electrode lifetime and limit its practical application. Here, for the first time, a novel CoFe 2 O 4 @Fe 2 O 3 nanocomposites combing dual Li-ions channels and stabilized hollow sphere architecture is reported. The unique transport routes for lithium ion have been created by the design of surface holes and inner channels, offering extra lithium storage sites and accelerating its transport. Quantitative kinetic analysis reveals that the capacity based on hollow sphere heterostructured NLCFs is governed by pseudocapacitance , especially at high current rates, exhibiting excellent rate performance and high specific capacity. Benefiting from the steady sphere hollow configuration and abundant ions channels, the NLCFs nanocomposites deliver excellent long-term stability (520 and 477 mAh g −1 at 5 and 10 A g −1 for 2000 cycles, respectively) with ultrahigh Coulombic efficiency (more than 99.5%). And the full cell can remain a reversible capacity of 516 mAh g −1 at the current density of 1 A g −1 after 500 cycles. This interesting dual lithium ion channels design opens a new avenue to build high-power LIBs for electrochemical energy applications .
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Science
·
2019
·Vol. 12
·期 3
·1046-1054
·
IF 33.25
Siwu Li,Yuan Liu,Junwen Zhou,Shanshan Hong,Yu Dong,Jiaming Wang,Xing Gao,Pengfei Qi,Yuzhen Han,Bo Wang
Li–CO2 batteries have been developed in recent years, aiming to utilize CO2, a major cause of the greenhouse effect, as an effective energy storage medium. However, current Li–CO2 batteries still suffer from low energy efficiency, poor rate capability and short cycle life, demanding the design of more efficient CO2 cathodes. Herein, we synthesized ultrafine MnO nanoparticles dispersed in a graphene-interconnected N-doped 3D carbon framework, MnO@NC-G, by pyrolyzing a composite of a GO-wrapped metal–organic framework (MOF) containing Mn(II) active sites as the cathode material for Li–CO2 batteries. This material can enable low voltage hysteresis (0.88 V at 50 mA g−1), high rate capability (up to 1 A g−1) and long cycle life (more than 200 cycles) in cells. By comparing MnO@NC-G with four other Mn(II)-based cathodes, MnO@NC, parent Mn-MOF, MnO@KB and bulk MnO, we propose three key aspects for designing CO2 cathodes: (1) dispersed catalytic species, (2) fast electron transport, and (3) a robust interconnected network. We also found that the performance of a cycled MnO@NC-G cathode can be replenished simply by replacing the anode, indicating that the cell cycle life can be further extended with effective anode protection. Our findings here provide useful guidelines for improving the performance of Li–CO2 batteries, thus shedding light on the development of practical Li battery systems based on gaseous cathodes.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）