CARBON
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2024
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IF 10.5
Shuqing Ma,Chunyan Ding,Zhuoyang Li,Yu Ma,Songsong Wu,Xiaozhen Ren,Shan Gao,Chuncheng Wei,Weiwei Zhou,Guangwu Wen,Xiaoxiao Huang
Currently, high-temperature thermal failure hinders the development of lithium-ion batteries (LIBs). Interfacial side reaction of electrolyte and electrode is the main cause of thermal failure at high temperature. Explicitly, suppressing interfacial side reactions at high temperatures can help the research of capacitive energy storage electrodes. While, thermo-electrochemical inert alumina can be facilitated to solve this problem. In this paper, pitaya configuration of nano-alumina islands uniformly dispersed in carbon matrix can be achieved from NOTT-300(Al). Nano-alumina contributes to the structural stability of porous carbon during carbonization and lithium deintercalation. And nano-alumina islands are effective in suppressing interfacial side reactions at high temperatures. Thus, NC-3 exhibits competitive specific capacity (717.1 mAh/g) and cycling stability (99.15% after 500 cycles). NC-3's capacity was confirmed to be mainly attributed to capacitive energy storage mechanism. This study provides a new research paradigm for nano-alumina to improve the high-temperature thermal stability management of LIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2023
·
IF 3.5
Yuhan Ren,Biao Zhang,Jian Ye,Haoqian Zhang,Zhaoxin Zhong,Yang Wang,Feng Ye
This study successfully prepared a series of novel Y 2 O 3 -SiO 2 composite aerogels using sol-gel methods. The high-temperature calcined SiO 2 -poor aerogels exhibit excellent high-temperature thermal stability in terms of shrinkage, porosity, and BET surface area maintenance. SiO 2 -rich aerogels exhibit more pronounced mesoporous material properties, the BET surface area and pore volume of sample Y2S1 reached 291.04 m 2 /g and 0.50 cm 3 /g, an increase of 278.71% and 297.78% over the pure Y 2 O 3 aerogel, respectively. In addition, compared with untreated mullite fiber, the thermal conductivity of the mullite fiber after impregnation with Y 2 O 3 -SiO 2 composite aerogels decreased by 35.32–45.77% at 300 °C, which is similar to the performance of impregnation with Al 2 O 3 -SiO 2 composite aerogel (38.31%). Moreover, the Y 2 O 3 -SiO 2 composite aerogel with a high BET surface area may have potential applications in the field of luminescent materials such as phosphors due to the intrinsic electronic structure of the rare-earth yttrium and its fantastic optical properties.
研究领域:
材料科学
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Liu,Jia-Ji Liang,Wei-Ming Guo,Chao Chang,Xiao-Ming Duan,De-Chang Jia,Hua-Tay Lin
High-temperature thermal stability plays a crucial role in the structural application of pressureless liquid-phase sintered SiC (PLS-SiC) ceramics. In this paper, a PLS-SiC ceramic processed with CeO 2 –Al 2 O 3 as sintering additives with excellent high-temperature thermal stability was achieved by incorporating (Hf, Zr, Ta, Nb, Ti)B 2 (HEB) particles. Results showed that PLS-SiC ceramics with HEB-free underwent a structural change from dense to porous microstructure after annealing at 1800 °C/1 h. Conversely, PLS-SiC ceramics with the addition of 10 vol% HEB exhibited excellent thermal stability, as evidenced by the retention of their dense microstructure after exposure to annealing at 1800 °C/1 h. The possible primary reasons for this significantly different response to the thermal stability could be probably attributed to fact that HEB reacted with CeAlO 3 and SiC to form solid-phase products, subsequently inhibiting the formation of gas-phase products after decomposition of CeAlO 3 alone in a high-temperature vacuum environment. In addition, the formation of a compact protective outer layer containing Hf–Ta containing diboride in PLS-SiC ceramics during the annealing process could effectively hinder the volatilization of volatile substances at a high temperature.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Guoqing Wang,Pengxing Cui,Longfei Jiang,Lianghao Chen,Peter Tatarko,Fengjun Zhang,Xiaobing Zhou
In this study, a highly dense GdB 6 bulk ceramic material was fabricated using one-step in-situ reaction spark plasma sintering technology. The sample with a relative density of 96.7 % and a purity of 96.9 wt% was successfully obtained by sintering at 1800 °C for 30 min under a uniaxial pressure of 50 MPa. The Vickers hardness , elastic modulus and fracture toughness of the as-obtained GdB 6 bulk ceramics were 18.9 GPa, 209 GPa and 1.6 MPa·m 1/2 , respectively. The thermal conductivity of GdB 6 at room temperature was 28.68 W·m −1 ·K −1 , 70 % of which was mainly attributed to phonon vibration, while the remaining 30 % to the electrical thermal conductivity. In addition, the as-obtained GdB 6 ceramics showed no phase transformation after heat treatment at a relatively high temperature of 2100 °C for 20 min in Ar atmosphere. The highly covalent octahedral boron framework played a critical role in maintaining the phase stability of the GdB 6 crystal lattice . This suggested that GdB 6 ceramics could be used as potential ultra-high temperature ceramics for aerospace applications and high-power vacuum electronic devices operated at high temperatures.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Ruyi Sha,Bingzhu Wang,Jixiang Dai,Jianjun Sha
Ceramic aerogels are promising high-temperature thermal insulation materials due to their outstanding thermal stability and oxidation resistance. However, restricted by nanoparticle-assembled network structures, conventional ceramic aerogels commonly suffer from inherent brittleness, volume shrinkage, and structural collapse at high temperatures. Here, to overcome such obstacles, 3D ultralight and highly porous carbon tube foams (CTFs) were designed and synthesized as the carbonaceous precursors, where melamine foams were used as the sacrificial templates to form the hollow and thin-wall network structures in the CTFs (density: ∼4.8 mg cm–3). Then, the arbitrary-shaped silicon carbide (SiC) nanofibrous aerogels (SNFAs) were obtained through a simple chemical vapor deposition (CVD) process on the CTFs. The resulting SNFAs exhibited excellent comprehensive performances: ultralow density (4.2 mg cm–3) and thermal conductivity (21.3 mW m–1 K–1 at room temperature), excellent rigidity (specific modulus: 13.2 kN·m kg–1), and resilient compressibility. The SNFAs could support over 2100 times their weight without visible deformation. Furthermore, the SNFAs also showed exceptional high-temperature thermal stability, which means that they could withstand 1100 °C in an air atmosphere and 1550 °C in an inert atmosphere. These superior comprehensive performances enable SNFAs to be suitable for thermal insulation in harsh environments.
研究领域:
材料科学
·
纳米技术
✓ 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）