Nanomaterials
·
2022
·Vol. 12
·期 5
·815
·
IF 5.719
Yang Xia,Zheng Fang,Chengwei Lu,Zhen Xiao,Xinping He,Yongping Gan,Hui Huang,Guoguang Wang,Wenkui Zhang
Conventional lithium-ion batteries with a limited energy density are unable to assume the responsibility of energy-structure innovation. Lithium-selenium (Li-Se) batteries are considered to be the next generation energy storage devices since Se cathodes have high volumetric energy density. However, the shuttle effect and volume expansion of Se cathodes severely restrict the commercialization of Li-Se batteries. Herein, a facile solid-phase synthesis method is successfully developed to fabricate novel pre-lithiated Li2Se-LiTiO2composite cathode materials. Impressively, the rationally designed Li2Se-LiTiO2composites demonstrate significantly enhanced electrochemical performance. On the one hand, the overpotential of Li2Se-LiTiO2cathode extremely decreases from 2.93 V to 2.15 V. On the other hand, the specific discharge capacity of Li2Se-LiTiO2cathode is two times higher than that of Li2Se. Such enhancement is mainly accounted to the emergence of oxygen vacancies during the conversion of Ti4+into Ti3+, as well as the strong chemisorption of LiTiO2particles for polyselenides. This facile pre-lithiated strategy underscores the potential importance of embedding Li into Se for boosting electrochemical performance of Se cathode, which is highly expected for high-performance Li-Se batteries to cover a wide range of practical applications.
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Journal of Energy Storage
·
2026
·
IF 10.7
Qi Liu,Jiacai Xiong,Zhimin Zou,Yu Bai,Chunhai Jiang
Nano-sized spinel lithium titanate (Li 4 Ti 5 O 12 , LTO) particles are homogeneously decorated on natural graphite (NG) granulates via a sol-gel method followed by thermal pyrolysis, forming NG-LTO composite materials. The LTO-modified NG anode demonstrate improved rate and cycle performance as anode materials of Li-ion batteries. Specifically, at a current rate of about 8 C (3 A g −1 ), the optimized NG-LTO composite anode displays a specific capacity of 97.5 mAh g −1 , and after 300 charge-discharge cycles at a current rate of 0.5 A g −1 , the capacity retention ratio is also enhanced referring to the pristine NG anode. The “zero-strain” effect and fast Li ion diffusion feature of LTO, and also its current sharing effect brought out by its high voltage plateau might have resulted in the improved electrochemical properties of NG-LTO composite anodes. These findings convincingly indicate that surface decoration of nano-LTO may provide a practical and feasible strategy for enhancing the rate and cycling performance of NG anode, promising for Li-ion batteries with fast-charging and long term cycling stability.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Dandan Yang,Jing Shi,Jinhong Shi,Huabin Yang
A silicon/tin@amorphous carbon-graphite (Si/Sn@C-G) composite material was successfully prepared by a simple high energy ball milling and annealing process , exhibiting excellent electrochemical performance in lithium-ion batteries. Structural characterization showed that the phase separated Si/Sn mixture was coated by amorphous carbon and were highly dispersed into the graphitic sheets. As a result, the Si/Sn@C-G composite exhibited a high initial coulombic efficiency of 81.5% and a stable reversible capacity of 612.6 mAh g −1 even after 100 cycles. Cyclic voltammetry and electrochemical impedance spectroscopy results indicated that the Sn acted as an active matrix and could obviously decrease the polarization resistance (Rp). And the ductile Sn could not only cushion the volumetric deformation of Si, but could also improve the Si dispersion. This work demonstrated a facile approach to synthesize highly stable Si/Sn@C-G composite in lithium-ions batteries.
研究领域:
材料科学
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储能
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电化学
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纳米复合材料
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电池技术
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THIN SOLID FILMS
·
2024
·
IF 2
Changhai Zhang,Xue Zhang,Bowen Zhang,Chao Yin,Yue Zhang,Yongquan Zhang,Tiandong Zhang,Yang Cui,Qingguo Chi
s The lead zirconate (PZO) anti-ferroelectric thin film capacitors, known for their high power density and rapid discharge speed, have garnered significant attention for applications in energy storage. Efficient strategies to enhance energy storage performance include doping and low-temperature annealing. PZO-based films, grown on Pt/Ti/SiO 2 /Si using the sol-gel method, undergo modification through Li + doping to enhance polarization and lowering the annealing temperature to improve the breakdown electric field. The results indicate that Pb(Zr 0.92 Li 0.08 )O 3 films, annealed at 550°C, exhibit a high energy storage density of 29.53 J/cm 3 , an efficiency of 82.38 % in an electric field of 4000 kV/cm, and maintain excellent electrical properties through 10 7 charge-discharge cycles. This study demonstrates that doping and low-temperature annealing enhance the energy storage properties of Pb(Zr 0.92 Li 0.08 )O 3 -based films, rendering them highly promising for application in dielectric capacitors.
研究领域:
材料科学
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能量存储
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陶瓷薄膜
·
电介质与绝缘体
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Junbo Zhang,Haikuo Zhang,Ruhong Li,Ling Lv,Di Lu,Shuoqing Zhang,Xuezhang Xiao,Shujiang Geng,Fuhui Wang,Tao Deng,Lixin Chen,Xiulin Fan
Passivation by the inorganic-rich solid electrolyte interphase (SEI), especially the LiF-rich SEI, is highly desirable to guarantee the durable lifespan of Li metal batteries (LMBs). Here, we report a diluent with the capability to facilitate the formation of LiF-rich SEI while avoiding the excess consumption of Li salts. Dissimilar to most of reported inert diluents, heptafluoro-1-methoxypropane (HM) is firstly demonstrated to cooperate with the decomposition of anions to generate LiF-rich SEI via releasing F-containing species near Li surface. The designed electrolyte consisting of 1.8 M LiFSI in the mixture of 1,2-dimethoxyethane (DME)/HM (2:1 by vol.) achieves excellent compatibility with both Li metal anodes (Coulombic efficiency ∼ 99.8%) and high-voltage cathodes (4.4 V LiNi 0.8 Mn 0.1 Co 0.1 O 2 (NMC811) and 4.5 V LiCoO 2 (LCO) vs Li + /Li). The 4.4 V Li (20 μm)||NMC811 (2.5 mA h cm −2 ) and 4.5 V Li (20 μm)||LCO (2.5 mA h cm −2 ) cells achieve capacity retentions of 80% over 560 cycles and 80% over 505 cycles, respectively. Meanwhile, the anode-free pouch cell delivers an energy density of ∼293 W h kg −1 initially and retains 70% of capacity after 100 deep cycles. This work highlights the critical impact of diluent on the SEI formation, and opens up a new direction for designing desirable interfacial chemistries to enable high-performance LMBs.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jie Tang,Fuzhong Wu,Xinyi Dai,Jiawang Zhou,Huixia Pang,Xingyu Duan,Bo Xiao,Dongjia Li,Junliang Long
Silicon (Si)-based materials were considered to be the most promising anodes for next-generation lithium-ion batteries because of their high theoretical specific capacity. However, huge volume expansion during lithiation/de-lithiation processes and low electrical conductivity cause its rapid degradation. Most research has focused on the modification of Si, binders, and electrolytes, however, little attention has been paid to conductive additives, a small but extremely important component of lithium-ion battery materials. Herein, 2D MXene nanosheet owing to excellent electrical conductivity is used as the conductive additive to improve the capacity and cycle performance of Si anodes. As a result, the Si-M1 electrode demonstrates a discharge specific capacity of 2522.6 mAh/g at a current density of 1A/g after 100 cycles and 1867.1 mAh·g −1 at 5A/g. In this regard, good electrical contact was maintained, along with the inhabiting generation of dead Si attributed to the volume effect that was suppressed by MXene. Besides, the terminal groups of MXene are conducive to the formation of materials with good conductivity in solid electrolyte interphase. This new insight may contribute to promoting the application of Si anodes and promising extended to other anodes living with huge volume expansion.
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Acta Biomaterialia
·
2023
·
IF 9.7
Mingxi Yang,Bang Su,Zhanchuan Ma,Xiaotian Zheng,Yan Liu,Yangfan Li,Jingyan Ren,Laijin Lu,Bai Yang,Xin Yu
Activation of autophagy in Schwann cells (SCs) has emerged as a powerful trigger for peripheral nerve injury (PNI) repair. Lithium ion (Li + ) is a classical autophagy activator that plays an important role in promoting axonal extension and remyelination . However, the therapeutic window of existing lithium drugs is extremely narrow, and the adverse side effects, especially nephrotoxicity, severely limit their therapeutic value. Herein, Li + -doped carbonized polymer dots (Li-CPDs) was synthesized for the first time to change the pharmacokinetics of Li + from occupying epithelial sodium channels to lipid raft-mediated endocytosis . The in-vivo results confirmed that Li-CPDs could accelerate the removal of myelin debris and promote nerve regeneration via activating autophagy of SCs. Moreover, Li-CPDs exhibited almost no renal toxicity compared to that of raw lithium drugs. Thus, Li-CPDs could serve as a promising Li + -based nanomedicine for PNI regeneration with improved biosafety. Statement of significance Regardless of the fact that lithium drugs have been used in treatment of mental illness such as manic depression, the systemic side effects and renal metabolic toxicity still seriously restrict their clinical application. Since Li + and Na + compete for ion channels of cell membrane , the cell entry efficiency is extremely low and easily affected by body fluctuations, which seems to be an unsolvable problem. Herein, we rationally exploited the endocytotic features of CPDs to develop Li-CPDs. The Li-CPDs improved the entry pathway, greatly reduced nephrotoxicity, and inherited the biological function of Li + to activate autophagy for promoting peripheral nerve regeneration. Due to the BBB-crossing property of Li-CPDs, it also showed application prospects in future research on central nervous system diseases.
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PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 8
·2200448
·
IF 2.5
Yiyin Yang,Kangzhou Xie,Donglin Tang
Alcoholysis of bisureas (BUs) would be of great potential among the non-isocyanate routes for preparing polyurethanes, if the issue of the high melting temperature and the poor solubility for BUs can be solved. In this study, it is proposed to introduce Li salt to assist the melting of BUs via a eutectic system. It is found that the melting point of BUs indeed can be reduced to 170 °C or even lower by adding 40 mol% of LiCl or LiBr. In the polymerizations of BUs with diols, it is found that ZnO nanoparticles (30 ± 10 nm) are the most efficient catalyst in the catalyst screening study. Four polyurethanes are successfully synthesized and the glass transition temperature of them is detected to be 34–45 °C. PU1010 is tougher than other polymers so that it is able to be molded. The Young's modulus of PU1010 is 195.1 MPa, while the strength and the elongation at break are 36.4 MPa and 280%, respectively. The toughness calculated is 67.3 J cm −3 . This Li salt-assisted melting strategy not only realizes the synthesis of polyurethanes through alcoholysis of BUs, but can also be extended to the synthesis of other high performance polymers.
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Chem
·
2022
·
IF 25.832
Zunchun Wu,Ruhong Li,Shuoqing Zhang,Ling lv,Tao Deng,Hao Zhang,Ruixin Zhang,Jiangjiang Liu,Shouhong Ding,Liwu Fan,Lixin Chen,Xiulin Fan
The stability of localized high-concentrated electrolytes (LHCEs) on the Li metal anode has been well established, but the understanding of its oxidation chemistry for high-voltage cathodes is unclear. Here, we demonstrate that the de-coordination between Li + and solvents defines the anodic stability of LHCEs, which can be finely tuned by the ambient diluents. After screening the possible diluents, we found that 2H,3H-decafluoropentane (HFC) satisfies the principle of relatively weak but sufficient interactions with solvation shell, thus strengthening the Li + coordination and offering electrolytes excellent antioxidant chemistry. The proposed HFC-LHCE enables practical Li metal batteries to realize >90% capacity retention with a Coulombic efficiency of 99.91% for >180 cycles under aggressive conditions (4.4 V 20-μm-Li||3.7-mAh cm −2 -LiNi 0.8 Mn 0.1 Co 0.1 O 2 and 4.5 V 20-μm-Li||4-mAh cm −2 -LiCoO 2 cells). This work presents guiding principles for improving electrolyte cathodic and anodic stability, which benefits the development of LHCEs and inspires the formulation of next-generation lithium batteries.
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Advanced Energy Materials
·
2022
·Vol. 12
·期 12
·2102764
·
IF 29.698
Zongqiang Sun,Xiaodong Lin,Wenjie Dou,Yanyan Tan,Ajuan Hu,Qing Hou,Ruming Yuan,Mingsen Zheng,Quanfeng Dong
The large charge overpotential and poor cycling stability triggered by sluggish Li 2 O 2 oxidation kinetics and severe superoxide-related side reactions greatly restrict the development and application of lithium–oxygen batteries. Finding out high-efficiency catalysts that can effectively facilitate a highly reversible formation/decomposition of lithium peroxide is still a crucial challenge in the field of Li–O 2 batteries. Herein, a soluble catalyst of 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) that can promote highly reversible formation and decomposition of Li 2 O 2 during discharge and charge processes is reported for the first time. During discharge, it can capture and couple two LiO 2 intermediates via its sulfonate and ammonium ions, and induce the intramolecular disproportionation reaction to produce Li 2 O 2 through ionic microenvironment, which not only prompts the solution-phase growth of Li 2 O 2 , but also restricts the reactivity of LiO 2 intermediate, thus significantly alleviating the electrode surface passivation issue and suppressing the superoxide-related side reactions. During charge, it can quickly transport electrons between the electrode and Li 2 O 2 by serving as a new kind of redox mediator (RM), thus greatly facilitating the Li 2 O 2 oxidation kinetics. As a result, the Li–O 2 batteries that incorporate ABTS exhibit outstanding electrochemical performance, low charge overpotential, high discharge capacity, and high cycling stability.
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Energy Storage Materials
·
2022
·
IF 20.831
Yunlong Deng,Jian Gao,Ming Wang,Congshan Luo,Chuanjiyue Zhou,Mengqiang Wu
Metallic Li anode has attracted much attention for the high energy density rechargeable Li batteries , owing to the low potential and ultrahigh theoretical specific capacity. However, the Li dendrite growth and high activity of Li hinder the application of lithium anode. In this work, the multiplex alloy composite skeletons have been prepared via a facile two-step preparation method to solve the drawbacks of Li anode, which can form uniformly distributed nucleation sites , homogenize Li-ion flux and reduce local ionization density to suppress the growth of lithium dendrites. Based on the analysis of cross-sectional operando microscopy images, it can be confirmed that the synthesized 3D composite alloy anodes can effectively suppress the formation and growth of lithium dendrites. Li-Mg-Ca electrode exhibits the most excellent mechanical property, thermostability, interfacial stability and electrochemical cycling stability. Specifically, Li-Mg-Ca alloy electrode exhibits the stable charge-discharge cycling performance for 1000 h (pristine Li only for 120 h) at a current density of 2 mA cm −2 for 4 mAh cm −2 . The practical 350 Wh kg −1 pouch cell works well and meets the energy requirements of electronic devices. Importantly, the research work in this article provides research ideas for the later lithium-free anode materials .
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Energy Technology
·
2022
·Vol. 10
·期 7
·2200269
·
IF 4.149
Yang Luo,Yicheng Deng,Yifei Shen,Hui Li,Yuliang Cao,Xinping Ai
Chemical prelithiation is considered to be a facile and efficient strategy to compensate the initial irreversible capacity loss of anode materials for achieving full capacity utilization of Li-ion batteries (LIBs). However, most of the prelithiation reagents reported so far are difficult to apply for commercially used graphite (Gr) anode due to their higher redox potentials than the formation potential of graphite–lithium compounds and the co-intercalation behavior in the interlayers of Gr anode, causing the exfoliation and destruction of Gr structure during prelithiation process. Herein, a new prelithiation solution for Gr anode by using lithium naphthalenide as a lithiation reagent and 2-methyl tetrahydrofuran as a reduction-tolerant solvent is demonstrated. This prelithiation solution has a very low redox potential of 0.19 V and can controllably and efficiently prelithiate Gr anode to a required degree in a few minutes without the solvent co-intercalation. Benefiting from these advantages, the Gr anode prelithiated for 3 min exhibits a high initial Coulombic efficiency of 100%, a better rate capability, and higher cycling capacity retention than conventional pristine Gr anode. Particularly, this prelithiation solution is low cost, easily synthesized, and recycled for industrial production, thus offering a practical convenience for LIBs manufacture.
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