ADVANCED MATERIALS
·
2024
·
IF 27.4
Hongliang Li,Jingyang Wang,Sheng Xu,Aoyuan Chen,Hangyu Lu,Yan Jin,Shaohua Guo,Jia Zhu
Na-ion batteries (NIBs) are sustainable alternatives to Li-ion technologies due to the abundant and widely-distributed resources. However, the most promising cathode materials of NIBs so far, O3 layered oxides, suffer from serious air instability issues, which significantly increases the manufactural cost and carbon footprint because of the long-term use of dry rooms. While some feasible strategies are proposed via case studies, universal design strategies for air-stable cathodes are yet to be established. Herein, the air degradation mechanisms of O3 cathodes are investigated via combined first-principles and experimental approaches, with bond dissociation energy proposed as an effective descriptor for predicting air stability. Experimental validations in various unary, binary, and ternary O3 cathodes confirm that the air stability can indeed be effectively improved via simple compositional design. Guided by the predictive model, the designed material can sustain 30-day air-storage without structural or electrochemical degradation. It is calculated that such air-stable cathodes can significantly reduce both energy consumption (≈4 100 000 kWh) and carbon footprint (≈2200-ton CO 2 ) annually for a 2 GWh NIBs manufactory. Therefore, the fundamental understandings and universal design strategy presented open an avenue for rational materials design of NIBs toward both elemental and manufactural sustainability.
研究领域:
材料科学
·
能源存储
·
可持续技术
·
电化学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Muhammad Habib,Haoyu Wang,Weisan Fang,Attaur Rahman,Maqbool Ur Rehman,Ting Wang,Qingfeng Zhu,Muhammad Javid Iqbal,Xiaoming Shi,He Qi,Weiping Gong
Superior energy-storage performance is imperative for next-generation electronics and pulsed power systems. However, in lead-free dielectric ceramics, achieving synergistic optimization of energy storage performance remains a critical challenge. The central obstacle lies in the simultaneous enhancement of both energy density ( W rec ) and efficiency ( η ). Herein, a high-entropy lead-free Bi 0.32 Na 0.32 Ba 0.32 La 0.04 TiO 3 -NaNbO 3 ceramics system is designed, guided by phase-field simulations and a strategic chemical composition approach. The synergistic effect of La-donor doping and NaNbO 3 addition induces local random fields and local random stresses, stabilizing multiphase ultrasmall polar nanoregions. Benefiting from these features, an ultrahigh energy storage performance of W rec ≈ 12.4 J cm − 3 and η ≈ 82.6% is realized under the applied field 790 kV cm −1 . Furthermore, a large W rec of ≈6.2 J cm −3 and a high η ≈ 85.8% with less than 5% variation across a broad temperature (30–150 °C) range are highly promising results for lead-free ceramics. This study marks a significant advancement in the energy storage performance and also provides a paradigm for the development of new lead-free ceramics for the next generation of pulsed power applications.
研究领域:
材料科学
·
能量存储
·
陶瓷
·
介电材料
·
计算材料设计
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Han Liu,Zhenyu Xu,Zhiyue He,Housheng Mao,Jiayang Lin,Naixin Zhai,Zhenzhi Cheng,Fei Gao,Guangsheng Luo,Weiping Zhou
Ultrathin and broadband microwave absorption materials are urgently needed for mitigating the detrimental effects of electromagnetic pollution for 5G applications and military stealth. In this work, high entropy heterostructured composites composed of oxides/alloys with abundant heterogeneous interfaces are engineered by introducing in-situ metal conductive phase through high-temperature reduction on solid-phase-sintered high-entropy spinel ferrites (CoNiCuX)Fe2O4. By further tailoring the elemental composition (X=Mn, Zn, Mg, Cr, MnMg, and MnCr), the dielectric, magnetic and conduction properties of the high-entropy heterostructured composites are modulated, resulting in enhanced microwave attenuation ability and optimized impedance matching characteristics. As a result, the (Co0.2Ni0.2Cu0.2Mn0.2Mg0.2)Fe2O4 derived high-entropy oxides (HEOs)/ferroalloy dual-phase composite simultaneously exhibits a minimal reflection loss of -48.77 dB accompanied by a maximum effective absorption bandwidth (EAB) of 6.08 GHz (11.92-18 GHz) at a thickness of only 1.5 mm. Furthermore, an ultra-broadband EAB of 11.5 GHz is realized by constructing macroscale gradient multilayer metamaterials with a thickness of 4.0 mm. This study demonstrates that reasonable composition and heterointerfaces engineering can facilitate synergistic effect of polarization loss, conduction loss and magnetic loss, which enables the heterostructured composites to exhibit superior impedance matching and enhanced microwave loss capability, thus achieving superior microwave absorption performance at thin matching thickness.
研究领域:
材料科学
·
微波工程
·
电磁兼容性
·
纳米技术
·
复合材料
·
固体物理学
✓ 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）