COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Zhilei Wei,Wenqi Xie,Bangzhi Ge,Zhejian Zhang,Wanli Yang,Hongyan Xia,Bo Wang,Haiyun Jin,Naikui Gao,Zhongqi Shi
Recently, anisotropic polymer/ceramic composites have attracted great attention because of their high thermal conductivity for the extensive usage in microelectronic devices. However, further enhancement of their thermal conductivity is a great challenge due to the presence of interface thermal resistance and lack of efficient heat conduction pathways. Herein, epoxy (EP)/aluminum nitride honeycomb (AlN–H) composites were fabricated through a two-step method including freeze-casting of the AlN–H reinforcements and EP infiltration . The results showed that the vertically aligned and interconnected thermal conductive networks contributed to the enhanced thermal conductivity and thermal stability of the composites with the increase in AlN loading. The composites exhibited maximal thermal conductivity values of 9.48 W m −1 K −1 and 4.45 W m −1 K −1 in the directions parallel and perpendicular to the AlN–H channels, respectively, at AlN loading of 47.26 vol%. The composites displayed excellent heat dissipation performance when they were attached to a working CPU, which indicates significant promise for application in thermal interface materials .
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Xiaofang Li,Chunlei Tan,Juantao Jiang,Shaoyi Wang,Fenghua Zheng,Xiaohui Zhang,Hongqiang Wang,Youguo Huang,Qingyu Li
High-efficient heat dissipation is essential to maintain the best performance of the electron devices . A new electron thermal conductive route is first proposed and constructed for the graphene metal matrix composites in this work. Functionalization of graphene with conjugated 4-ethynylaniline (FGr) and deposition of FGr and Cu 2+ ions onto the copper surface by pulsed-current co-electrodeposition are successively employed to prepare the FGr/Cu composite. The resulting thermal diffusivity of FGr/Cu is high as 1.444 cm 2 s −1 at 100 °C, which is corresponding to the thermal conductivity of 497 W m −1 K −1 and higher than the reported values via single phonon thermal conductive route. FGr/Cu can maintain a superior and stable thermal conductive property at high temperature with a multiple of 1.61 and 1.31 at 100 °C and 150 °C compared to the Cu, respectively. The delocalized conjugated π bond in the graphene/Cu interface is successfully established through the bridging of graphene and metal with conjugated organic molecule possessing p orbits, which leads to the construction of a new electron thermal conductive route. This innovation presents an entirely new direction to develop graphene-based metal matrix composite with high-efficient heat dissipation.
研究领域:
材料科学
·
热传导工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Xiaofang Li,Meng An,Peide Li,Jianwen Miu,Qiang Wu,Fenghua Zheng,Juantao Jiang,Hongqiang Wang,Youguo Huang,Qingyu Li
Developing highly efficient thermal management techniques is crucial in order to achieve the best performance of electronic equipment. Here, a delocalized conjugated system was established by the conjugation of sp2 orbitals in phenylamine groups and a delocalized big π bond in graphene to construct an electron thermal conduction route. Then, the abundant π electrons in graphene can be transferred to the adjacent copper unimpededly, leading to a remarkable thermal conductivity. These results demonstrate that the copper substrate deposited with phenylamine-functionalized graphene (PA–Gr–Cu) shows a high thermal conductivity of 506 W m–1 k–1, which is 30.8 and 44.2% higher than those of the pristine graphene–copper composite (Gr–Cu) and copper (Cu), respectively. Placed on a heat source heated from 30 to 210 °C within 5 min, the top surface temperature of PA–Gr–Cu increases to 198 °C rapidly, whereas those of Gr–Cu and Cu only increase gently to 88 and 59 °C. This work demonstrates that phenylamine with a pair of lone electrons in the N atom shows superiority as an intermediate molecule to link graphene and copper to establish a delocalized conjugated system. This innovation provides another solution to establish a conjugated structure between graphene and copper to construct an electron thermal conduction route with remarkable thermal conduction properties and will promote the research on the electron thermal conduction route for graphene-based metal matrix composites in the application of thermal dissipation.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Ruiyang Li,Haiming Hua,Yuejing Zeng,Jin Yang,Zhiqiang Chen,Peng Zhang,Jinbao Zhao
Poly(ethylene oxide) (PEO) is a classic matrix model for solid polymer electrolyte which can not only dissociate lithium-ions (Li + ), but also can conduct Li + through segmental motion in long-range. However, the crystal aggregation state of PEO restricts the conduction of Li + especially at room temperature. In this work, an amorphous polymer electrolyte with ethylene oxide (EO) and propylene oxide (PO) block structure (B-PEG@DMC) synthesized by the transesterification is firstly obtained, showing an ionic conductivity value of 1.1 × 10 −5 S/cm at room temperature (25 °C). According to the molecular dynamics (MD) simulation, the PO segments would lead to an inconsecutive and hampered conduction of Li + , which is not beneficial to the short range conduction of Li + . Thus the effect of transformation of aggregation state on the improvement of ionic conductivity is not enough, it is necessary to further consider the different coupled behaviours of EO and PO segments with Li + . In this way, we blend this amorphous polymer (B-PEG@DMC) with PEO to obtain a dual range ionic conductive solid polymer electrolyte (D-SPE) with further improved ionic conductivity promoted by constructing a dual range fast ionic conduction, which eventually shows a further improved ionic conductivity value of 2.3 × 10 −5 S/cm at room temperature.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Liyuan Guo,Lei Feng,Caiyue Huang,Qiang Song,Peng Wei,Dongfang Xu,Mengdan Hou,Haojie Song
Technological advances have accelerated the development of high-performance insulation-based Thermal Interface Materials (TIMs), leading to increased generation of electronic waste. A significant challenge is the development of recyclable TIMs with superior thermal conductivity. Hemiaminal dynamic covalent network (HDCN) polymers are considered as an ideal matrix material for recyclable TIMs due to their high degradability at low pH (pH < 2). In this work, binary thermally conductive paths of hexagonal boron nitride nanoribbons (BNNRs) and boron nitride nanosheets (BNNSs) are introduced into the HDCN to improve the thermal conductivity of HDCN without sacrificing its electrically insulating properties. The functional BNNSs (f-BNNSs) are attached onto the surfaces of BNNRs to achieve the homogeneous distribution of nanosheets within the HDCN. Benefiting from the binary thermally conductive paths, an excellent in-plane thermal conductivity of 3.12 W m −1 K −1 for BNNS-BNNR/HDCN nanocomposite is achieved at a BN loading of 14 wt% (containing 2 wt% BNNRs and 12 wt% f-BNNS), increased by 1299 % comparing to the pure HDCN polymer, as well as superior to those reported for polymer composites with similar loading of BNNRs or BNNSs. Additionally, the nanocomposite demonstrated efficient recyclability of BNNSs and BNNRs hybrid fillers in an acidic environment (pH < 2) at 25 °C with a recycling efficiency of 82 %. Notably, the nanocomposite exhibited noteworthy electrical insulation properties. This study demonstrates the potential of BNNS-BNNR/HDCN as a recyclable TIMs and provides a new idea for the future research and development of recyclable high performance TIMs.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2019
·
IF 2.886
Chengzhou Xin,Xue Zhang,Chuanjiao Xue,Shuo Wang,Liangliang Li,Ce-Wen Nan
Solid-state lithium (Li) metal batteries with enhanced safety and high energy density have attracted ever-increasing attention. However, it is challenging to construct an effective ionic conduction pathway in the composite cathode of the solid-state batteries , especially when the mass loading of active materials is high. Herein, we prepare a gel composite cathode by introducing an in-situ polymerized gel polymer electrolyte into the cathode. The voids in the cathode and the gaps between the cathode and the electrolyte layer are filled with the gel electrolyte, and thus a fast Li-ion conduction pathway is established. Solid-state Li metal batteries with LiCoO 2 and LiFePO 4 -based gel composite cathodes show excellent cycling performance. Even at a high mass loading of 11.09 mg cm − 2 , the cell with a LiCoO 2 –based gel composite cathode has a long cycle life at 0.088 mA cm − 2 at room temperature . The experimental data demonstrate that the conductive gel composite cathode has promising applications in solid-state batteries with high energy density .
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wenyong Yuan,Minghui Ding,Junying Weng,Tianyu Xue,Mingyu Xie,Pengju Zhang,Jinglin Mu,Pengfei Zhou
Composite polymer electrolytes (CPEs) have attracted wide attention because of their enormous potential to address the limitations of traditional liquid electrolytes. However, the inevitable aggregate and precipitate of inorganic filler in polymer electrolytes could lead low ionic conductivity , poor interfacial compatibility and mechanical property, which limited the application of CPEs for high energy density solid-sate batteries. Herein, a novel composite electrolyte membrane (Z-CPE@ZIF60) was achieved by impregnating ZIF-67 particles into a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and polyacrylonitrile (PAN) hybrid nanofibers membrane with continuous and interconnected 3D network via electrospinning and in situ photopolymerization strategy. Using this electrolyte membrane for quasi-solid-state sodium batteries, a high ionic conductivity of 1.42 × 10 −3 S cm −1 and outstanding Na + transference number of 0.58, and excellent mechanical properties was obtained at room temperature owing to continuous Na + conduction pathways in the interconnected 3D network with PVDF-HFP/PAN hybrid nanofibers, the Lewis acid-base interaction between anions and ZIF-67. In addition, the solid electrolyte interface film formed by the contact of PVDF-HFP and Na anode effectively suppressed the growth of sodium dendrites. As a result, symmetric Na cells exhibit a stable polarization for 600 h under 0.1 mA cm −2 , indicating outstanding Na stripping/plating reversibility. Furthermore, the quasi-solid-state sodium batteries Na 0.67 Ni 0.33 Mn 0.37 Ti 0.3 O 1.9 F 0.1 (NaNMTi 0.3 OF)/Z-CPE@ZIF60/Na displayed impressive rate and cycling performance.
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jieyan Zhao,Yingnan Song,Zengchao Yang,Yong Li,Jiangtao Li
Daytime radiative cooling enables passive cooling of objects without consuming energy. However, it is a challenge for most radiative cooling films to achieve exceptional solar reflectivity , infrared emissivity and thermal conductivity simultaneously, which limits their applications in above-ambient conditions such as electrical equipment . Herein, we prepare highly solar-reflective β -Si 3 N 4 dielectric particles with solar reflectivity exceeding 0.91 and atmospheric window emissivity of 0.93 by one-step combustion synthesis . The radiative cooling film consisted of β -Si 3 N 4 particles and PVDF matrix achieves a subambient cooling performance of 11.63 °C and theoretically yields a radiative cooling power of 45.41 W m −2 in the daytime. Futhermore, the film exhibits high thermal conductivity of 3.19 W m −1 K −1 due to the heat conducting pathways constructed by elongated rod-like β -Si 3 N 4 particles, which leads to a remarkable temperature drop of 5.00 °C when be applied on the surface of 5 W LED. The film reported here provides a practical option for the efficient radiative cooling and heat dissipation of electrical equipment.
研究领域:
材料科学
·
热能工程
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光子学
·
能源效率
✓ 已验证
DOI
高影响因子
Batteries & Supercaps
·
2024
·Vol. 7
·期 6
·e202400075
·
IF 5.1
Yuanyuan He,Jiawen Tang,Xiao Huang,Xin Ao,Bingbing Tian
Solid polymer electrolytes (SPEs) are considered a promising solution to the safety problems of lithium-ion batteries (LIBs) using liquid electrolytes. However, the high crystallinity and low ionic conductivity hinder the practical application of SPEs. Herein, we design a composite solid polymer electrolyte with a dual fast Li + conducting pathway in bulk and interface by incorporating highly Li + conductive ceramic Li 6.4 Ga 0.2 La 3 Zr 2 O 12 (LGLZO) in polyethylene oxide (PEO)/Li–bis (trifluoromethanesulfonyl) imide (LiTFSI) system. Compared to Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 (LLZTO), LGLZO provides better Li + conductivity; therefore, a fast Li + conducting pathway will form in the bulk of LGLZO nanofillers. Besides, LGLZO nanofiller accelerates the dissociation of LiTFSI and benefits the transfer of free Li + through the SPEs near the LGLZO surface, forming another interface fast Li + conducting pathway in the SPEs. Benefits from the dual fast Li + pathway design, the composite electrolyte membrane with 15 wt % LGLZO nanoparticles presents a high ionic conductivity of 8.0×10 −4 S cm −1 at 60 °C. The Li−Li symmetric cells with optimized content LGLZO show good cycling stability (no short circuit even after 1000 h), and the all–solid Li/LiFePO 4 batteries exhibit excellent cycling performance (remained 154 mAh g −1 after 500 cycles at 0.2 C under 60 °C). Graphical The PEO–based composite solid electrolyte containing LGLZO particles has constructed fast Li + conduction dual channels at the interface between LGLZO blocks and LGLZO and PEO, and has excellent electrochemical performance. In addition, the safe, reliable and low–cost synthesis method provides a favorable pathway for the modification of solid–state polymer electrolytes.
研究领域:
材料科学
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电化学
·
能源存储
·
高分子化学
·
固态离子学
✓ 已验证
DOI
高影响因子
Energy Advances
·
2022
·Vol. 1
·期 12
·1028-1034
·
IF 0
Lei He,Jian-Hua Cao,Ya-Kun Wang,Da-Yong Wu
Increasing the proportion of inorganic electrolytes in organic–inorganic composite electrolytes can significantly improve the ionic conductivity of composite electrolytes. However, this method is confronted with some problems, such as the uneven dispersion of inorganic electrolytes and the aggregation of nanoparticles, which results in a worse performance of the electrolytes’ interface. In this study, we had the dopamine hydrochloride molecules self-polymerized on the surface of inorganic ionic conductor lithium titanium aluminum phosphate (LATP) particles to obtain PDA-coated LATP nanoparticles. Then, the coated LATP particles were composited with PEO at a ratio of 80 : 20, with the LATP's evenly dispersed in the PEO, and no aggregation happened. On adding a small amount of electrolyte (5 μL cm−2, 1 M Li TFSI), the ionic conductivity of the electrospun PI-loaded PEO0.2–PDA@LATP0.8 flexible composite solid electrolyte reached 2.07 × 10−4 at 30 °C and 2.05 × 10−3 S cm−1 at 80 °C. NCM811‖Li batteries assembled with this electrolyte had an initial discharge capacity of 178.0 mA h g−1 at 30 °C, and still remained at 172.1 mA h g−1 (96.7%) after 200 cycles. The research shows that there are three main conduction pathways of Li+ in this electrolyte: through the segments of the polymer chains, through the interface between the polymer and inorganic ionic conductor, and through the passage composed of a continuous inorganic ionic conductor. Further results show that the coating of LATP by PDA does not block the transmission of Li+ both inside the crystal and at the crystal interface of LATP.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Dong An,Hongfeng Chen,Huitao Yu,Jiaqi Chen,Junru Yao,Chingping Wong,Wei Feng
Driven by the increasing integration and higher power requirements of electronics, polymer-based composites with high-performance in terms of thermal conductivity (TC) and electromagnetic (EM) wave absorption have become an important issue. Herein, multi-layer boron nitride-carbon nanotube/carboxymethyl cellulose/polydimethylsiloxane (BN–CNT/CMC/PDMS) composites with enhanced interface interactions and continuous thermal pathways with gradient impedance were manufactured through a strategy involving chemical surface modification, directional freeze casting, freeze drying and matrix infiltration. Benefiting from the covalent bonding effect between fillers as well as the consecutive thermal conductive pathways, the obtained composites achieved a maximum through-plane TC of 3.56 W m K−1 at a filler content of only 8 wt%. Meanwhile, the composites also achieved an ultra-wide effective electromagnetic wave absorption bandwidth (EMB) of 13.45 GHz, which was attributed to the precisely controllable electromagnetic parameters and the gradient impedance structures. Therefore, these results fully indicate that the composites have great application potential as packaging materials for advanced electronics.
研究领域:
材料科学
·
电磁工程
·
热管理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Yingmin Jin,Xin Zong,Xuebai Zhang,Chaojun Liu,Dong Li,Zhenggang Jia,Gen Li,Xuanguang Zhou,Junhua Wei,Yueping Xiong
Composite solid electrolyte (CSE) consisting of Li + conductive fillers and polymer matrix has become attractive for high energy-density lithium batteries . Current researches focus on the “ceramic in polymer”-type CSE due to the severe agglomeration of ceramic particles. Consequently, the destroyed percolation network impedes the further improvement in ionic conductivity . In this work, we report a novel structural design of ceramic-enriched CSE consisting of three-dimensional (3D) interconnected Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP), polyvinylidene fluoride (PVDF) and LiN(SO 2 ) 2 (CF 3 ) 2 (LiTFSI). The 3D LATP network is constructed through the surface functionalization of LATP particles by polymethyl methacrylate (PMMA). Owing to the intermolecular interaction between PMMA and PVDF, the incorporation of PMMA-coated LATP (denoted as LATP@PMMA) enables the uniform distribution of ceramic phase and generates interconnected LATP network. Noticeably, such an electrolyte maximizes the utilization of inorganic fillers through the facile treatment of zero-dimensional materials, which is comparable to those 3D template-derived fillers. Furthermore, continuous Li + conduction pathways through LATP framework and LATP/PVDF interphase are guaranteed by the enhanced affinity of LATP towards PVDF matrix and the intrinsic Li + complexation capability of PMMA. Remarkable cycling performances of the LiNi 0.5 Co 0.2 Mn 0.3 O 2 /LATP@PMMA-PVDF/Li batteries confirm the feasibility of 3D ceramic-enriched composite electrolyte in the application of solid-state lithium batteries.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）