JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Xingyi Shi,Qingwei Sun,Bismark Boateng,Yinghua Niu,Yidong Han,Weiqiang Lv,Weidong He
The safety of lithium ion batteries is correlated closely to the mechanical property and thermal stability of separators. The polymer/ceramic particle composite separators are widely investigated for quasi-solid gel separators of lithium ion batteries, but the nonuniform dispersion of ceramic particles limits their performance. In this study, ball-milled Al-doped Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 suspension is incorporated into poly (vinylidene fluoride- co -hexafluoropropylene) gel to prepare a highly uniform quasi-solid composite separator. The results show that adding only 4.29 wt% Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 into PVDF-HFP increases ductility by three times and the mechanical strength by 38% as compared with pure PVDF-HFP separator. Batteries with the composite separator show significantly improved cyclic stability and rate performance at both room temperature and temperatures up to 80 °C. In particular, the composite separator promotes homogenous Li + flux through the separator and suppresses Li dendrite growth in Li-metal based batteries.
研究领域:
材料科学
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电化学
·
电池技术
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 11
·9806-9812
·
IF 3.277
Zhibing Sun,Dezhong Zhou
Three oligomeric linear poly(beta-amino esters) (PAEs) were synthesized and used to improve the gene transfection efficiency and reduce the cytotoxicity of poly(L-lysine) (PLL). The synthesized PAEs can co-assemble with PLL and plasmid DNA to form PLL/PAE/DNA ternary complexes of nanoscale sizes and moderate surface charges. The existence of multiple tertiary amines on PAE backbones imparts the ternary complexes with strong proton buffering capacity and therefore enhances the endosomal escape ability of the ternary complexes. In HeLa cells, the PLL/PAE/DNA ternary complexes show up to 476-fold enhancement in gene transfection efficiency when compared with the PLL/DNA binary complexes. Meanwhile, the incorporation of PAE oligomers significantly reduced the cytotoxicity of PLL. The strategy proposed here may provide insights into the development of PLL based gene delivery systems.
研究领域:
生物化学
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分子生物学
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基因治疗
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Zichao Guo,Wei Feng,Shiran Li,Peng Zhou,Liping Chen,Wanghua Chen
To prevent thermal runaway incidents in semibatch reactors (SBRs), designing thermally safe operating conditions should be considered first. Regretfully, determination of the reaction kinetics for organic reactions is a time-consuming and money-consuming process, especially in the fine chemical and pharmaceutical industries. Therefore, it is desirable to develop kinetic-parameter-free methods that can design the right operating conditions. Along this line, a new facile approach to design thermally safe operating conditions for isoperibolic homogeneous SBRs has been developed in this article. This approach is developed on the basis of deep insights into the phenomenon that the MTSR vs reaction temperature profiles for isothermal exothermic reactions present an “S” shape. The approach has been experimentally validated using the hydrolysis reaction of acetic anhydride. However, more work should be carried out to extend this method to more complex reaction systems, like consecutive reactions.
研究领域:
化学工程
·
安全工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yuhan Li,Zongjie Sun,Lei Shi,Shiyao Lu,Zehui Sun,Yuchuan Shi,Hu Wu,Yanfeng Zhang,Shujiang Ding
Solid-state polymer electrolyte with high ionic conductivity and electrochemical stability is desirable for lithium metal batteries. A poly(ionic liquid)-polyethylene oxide semi-interpenetrating polymer network composite solid electrolyte for safe lithium metal batteries is designed to satisfy the demand of ionic conductivity, safety and electrochemical stability. This composite solid electrolyte is fabricated via polymerizing 1-vinyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (ionic liquid monomer) in polyethylene oxide matrix by one-step method. Differential scanning calorimetry results reveal that the crystallinity of composite solid electrolyte reduce to 15.5% comparing with polyethylene oxide solid electrolyte owing to the confinement of poly(ionic liquid) interpenetrating network. The semi-interpenetrating polymer network structure simultaneously endow the composite solid electrolyte with high ionic conductivity (6.12 × 10 −4 S cm −1 at 55 °C) and wide electrochemical window (5.44 V vs. Li/Li + ) and thermal decomposition temperature (280 °C). In order to verify the favorable electrochemical performance of composite solid electrolyte, we assemble the cells with LiFePO 4 /Li using the electrolyte. The reversible capacity of LiFePO 4 is 147 mAh g −1 with high Coulombic efficiency (up to 99%) at the 0.2 C rate and 55 °C.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 5
·1905737
·
IF 11.459
Ben Tang,Han Wu,Xiaofan Du,Xiangyang Cheng,Xing Liu,Zhe Yu,Jinfeng Yang,Min Zhang,Jianjun Zhang,Guanglei Cui
Conventional lithium–sulfur batteries often suffer from fatal problems such as high flammability, polysulfide shuttling, and lithium dendrites growth. Here, highly-safe lithium–sulfur batteries based on flame-retardant electrolyte (dimethoxyether/1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether) coupled with functional separator (nanoconductive carbon-coated cellulose nonwoven) to resolve aforementioned bottle-neck issues are demonstrated. It is found that this flame-retardant electrolyte exhibits excellent flame retardancy and low solubility of polysulfide. In addition, Li/Li symmetrical cells using such flame-retardant electrolyte deliver extraordinary long-term cycling stability (less than 10 mV overpotential) for over 2500 h at 1.0 mA cm −2 and 1.0 mAh cm −2 . Moreover, bare sulfur cathode–based lithium–sulfur batteries using this flame retardant electrolyte coupled with nanoconductive carbon-coated cellulose separator can retain 83.6% discharge capacity after 200 cycles at 0.5 C. Under high charge/discharge rate (4 C), lithium–sulfur cells still show high charge/discharge capacity of ≈350 mAh g −1 . Even at an elevated temperature of 60 °C, discharge capacity of 870 mAh g −1 can be retained. More importantly, high-loading bare sulfur cathode (4 mg cm −2 )–based lithium–sulfur batteries can also deliver high charge/discharge capacity over 806 mAh g −1 after 56 cycles. Undoubtedly, the strategy of flame retardant electrolyte coupled with carbon-coated separator enlightens highly safe lithium–sulfur batteries at a wide range of temperature.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Bio Materials
·
2018
·
IF 0
Xueqing Qiu,Ying Li,Yong Qian,Jingyu Wang,Shiping Zhu
Requirements for safe, stable, and long-acting sunscreens are successfully accomplished by natural lignin due to its broad-spectrum ultraviolet (UV)-blocking and synergistic properties. Chemical sunscreens are encapsulated in enzymatic hydrolysis lignin (EHL) by a one-step high-intensity ultrasound method. Chemical sunscreen/EHL microcapsules were formed with 3 min processing, and the product could be stored without leaking for more than a whole year. Adding H2O2 increased the cross-linking degree of EHL on the surface of the capsules. When 5 wt % alkyl polyglucoside (APG) was added as surfactant, the size of capsules dramatically decreased to ∼100 nm and the ratio of EHL and chemical sunscreen reached 1:1, which significantly enhanced UV-blocking ability of the composites. Compared to the creams containing chemical sunscreen/EHL microcapsules and free chemical sunscreen, the sun protection factor (SPF) of the cream containing the same amount of chemical sunscreen/EHL nanocapsules increased 85% and 195%, respectively. The cream containing 10 wt % of UVA and UVB type chemical sunscreen coencapsulated nanocapsules gave SPF 408. Due to antiphotolysis protection of EHL, the SPF of the creams increased initially and was maintained for more than 8 h under UV radiation. There was no obvious leaking or permeation of chemical sunscreens from the capsules. The EHL-based capsules showed good biocompatibility.
研究领域:
材料科学
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生物学
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化学工程
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产品关联
DOI
PubMed
Advanced Energy Materials
·
2018
·Vol. 8
·期 32
·1802441
·
IF 21.875
Tianyu Lei,Wei Chen,Yin Hu,Weiqiang Lv,Xiaoxue Lv,Yichao Yan,Jianwen Huang,Yu Jiao,Junwei Chu,Chaoyi Yan,Chunyang Wu,Qiang Li,Weidong He,Jie Xiong
Lithium-sulfur (Li-S) batteries are of considerable research interest for their application potentials in high-density energy storage. However, the practical application of Li-S batteries is severely plagued by polysulfide (PS) dissolution and serious safety concerns caused by flammable sulfur and polymer separators. Herein, a nonflammable multifunctional separator for efficient suppression of PS dissolution and high-temperature performance of Li-S batteries is reported. Polyacrylonitrile (PAN) and ammonium polyphosphate (APP) are electrospun into a multifunctional separator (PAN@APP) for stable and safe Li-S batteries. Owing to the abundant amine groups and phosphate radical in APP, the PAN@APP separator has strong binding interactions with PS, which exerts strong charge repulsion to suppress the transport of negatively charged PS ions and free radicals. Furthermore, refractory APP ensures the stability of the battery at high temperatures. Using the PAN@APP separator, the Li-S battery demonstrates a capacity retention of 83% over 800 cycles. This work provides a robust materials platform for stable and safe Li-S batteries and points to a direction to close the current gap facing the commercialization of high-energy next-generation electrochemical conversion/storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Yang Han,Yuanyuan Liu,Shiwei Wang,Xuehui Ge,Xiaoda Wang,Ting Qiu
Tonalid, an important fragrance ingredient with widespread application, was synthesized via two Friedel-Crafts reactions, which were catalyzed by AlCl 3 . The traditional tonalid production was conducted in batch stirring tank reactors, suffering from low production capacity and the safety hazard of temperature runaway. To solve these problems, the continuous-flow technologies were developed for the high-efficiency and intrinsically safe synthesis of tonalid in microreactors. Catalyst AlCl 3 was neatly homogenized in proper solvents by forming complex with reactant, which was a necessary step for the continuous synthesis in microreactors. Several reaction conditions, including reactant molar ratio, catalyst concentration, temperature, and microchannel hydrodynamic diameter, were investigated for the two Friedel-Crafts reactions in microreactors. At optimized conditions, the yields of the two Friedel-Crafts reactions were 44.15% and 97.55%, respectively. In comparison with the batch reactors, the reaction times of these two reactions could both be reduced by nearly two thirds in microreactors at the similar yield.
研究领域:
化学工程
·
有机合成
·
安全工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 2
·2208206
·
IF 19.924
Chaolin You,Wenbin Wu,Wangsheng Yuan,Peng Han,QianYu Zhang,Xi Chen,Xinhai Yuan,Lili Liu,Jilei Ye,Lijun Fu,Yuping Wu
Traditional aqueous energy storage devices are difficult to operate at low temperatures owing to the poor ionic conductivity and sluggish interfacial dynamics in frozen electrolytes. Herein, the low-cost brine refrigerants for food freezing and preservation as electrolytes, and unexpectedly realize high ionic conductivity and stable operation of an aqueous storage device at low temperatures are demonstrated. A CaCl 2 brine refrigerant electrolyte (BRE) with a low freezing point −55 °C and high ionic conductivity (10.1 mS cm −1 at −50 °C) is developed for supercapacitors (SCs), which retains 80% of the room temperature capacity at −50 °C and exhibits ultra-long cycle life with excellent capacity retention of 92% over 98,500 cycles, outperforming the other SCs which can be operated below −40 °C in literature. Moreover, the SCs with MgCl 2 and NaCl BREs can also be operated successfully with excellent cycle stability and high-capacity retention at low temperatures of −30 and −20 °C, respectively. Fundamental correlation between various cations and their effect on the freezing point reduction of aqueous electrolytes is revealed via Raman investigation and molecular dynamics simulations. This study provides a rational design strategy for green, inexpensive, and safe low-temperature aqueous electrolytes for energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiao-Die Zhang,Zhi Li,Lin-Yun Jiang,Qing-Qing Bi,Hong-Fang Li,Jiacheng Wang,Jimena de la Vega,De-Yi Wang
Aiming to strengthening fire retardancy of epoxy resin without sacrificing the mechanical performance, boron nitride (BN) was synchronously stripped and activated using a bio-based tannic acid (TA)-assisted milling strategy, followed by featuring osteoarticular-inspiring surface engineering of interlocking structure. Experimental and DFT virtual evaluation evidenced the effectiveness of TA-assisted upscaling milling strategy by the vigorous affinity between boron (BN) and oxygen atom (TA). A spatially adjustable piling of lamellar NiCo-LDH on the globally activated BN (fBN) was manipulated using an exclusive metal–organic framework (MOF)-derived etching-conversion mode. 6 wt% targeted fBN@NiCo-LDH imparted epoxy with UL-94 V-1 rating and reduced peak smoke production rate by 30.0 %. A totally catalytic conversion of toxic CO by interface-located NiCo-LDH was observed. An insightful fire-safe mechanism investigation via dynamic and static analysis demonstrated the formation of compact and continuous char structure with a higher polyaromatic degree via the interface-charring catalysis. Additionally, the tensile strength and impact toughness were unconceivably enhanced by 54.2 % and 127.0 % respectively, which was presumably evidenced by in-situ formed osteoarticular-inspiring interlocking structure. In parallel, EP/6fBN@NiCo-LDH presented a 20 °C increased glass transition temperature and marginally enhanced thermal conductivity. Prospectively, the surface engineering via osteoarticular-inspiring interlocking coupled with bio-based exfoliation exploit a novel roadmap for multifunctional nano-reinforcer.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 11
·e53618
·
IF 3
Datuan Li,Xingxu Gao,Min Cao,Lei Sheng,Ling Yang,Xin Xie,Yun Gong,Qingyang Hu,Qiangqiang Xie,Tao Wang,Jianping He,Xianli Huang
Traditional polyolefin separators cannot guarantee safety for lithium-ion batteries at high temperature due to their low melting point, especially for high power discharge. Therefore, it is imperative to develop separators with excellent thermal stability. In this paper, we have prepared TiO 2 modified PVDF composite separators by electrospinning. When compared with commercial PE separators, this kind of composite separators show superior thermal stability at 160°C. In addition, it is found that the 0.5-TiO 2 @PVDF separator exhibits excellent flame retardant and optimal tension strength. Meanwhile, the 0.5-TiO 2 @PVDF separator exhibits ideal liquid electrolyte storage capacity, which improves the ionic conductivity (0.68 mS cm −1 ). As a result, the LiCoO 2 ||Li cells with 0.5-TiO 2 @PVDF separator have high discharge capacity retention rate at a current density of 1 C (300 cycles) and excellent rate performance (1.75 mAh at 5 C). In short, nano-TiO 2 modified PVDF separator has a great application prospect in high-performance and high-safety lithium-ion batteries.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yunlong Yang,Zilin Chen,Tian Lv,Keyi Dong,Yanan Liu,Yunlong Qi,Shaokui Cao,Tao Chen
Traditional polyolefin separators for lithium-ion batteries (LIBs) often experience limited thermal stability and intrinsic flammability, resulting in great safety risks during their usage. Therefore, it is highly important to develop novel flame-retardant separators for safe LIBs with high performance. In this work, we report a flame-retardant separator derived from boron nitride (BN) aerogel with a high BET surface area of 1127.3 m 2 g −1 . The aerogel was pyrolyzed from a melamine-boric acid (MBA) supramolecular hydrogel, which was self-assembled at an ultrafast speed. The in-situ evolution details of the nucleation-growth process of the supramolecules could be observed in real-time using a polarizing microscope under ambient conditions. The BN aerogel was further composited with bacterial cellulose (BC) to form a BN/BC composite aerogel with excellent flame-retardant performance, electrolyte-wetting ability and high mechanical property. By using the BN/BC composite aerogel as the separator, the developed LIBs exhibited high specific discharge capacity of 146.5 mAh g −1 and excellent cyclic performance, maintaining 500 cycles with a capacity degradation of only 0.012% per cycle. The high-performance flame-retardant BN/BC composite aerogel represents a promising candidate for separators not only in LIBs but also in other flexible electronics.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）