JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 3.9
Huang Xing-Wen,Chen Yi-Zhao,Hu Jin-Hong,Liao Song-Yi,Li Yue-Zhu,Liu Rong-Tao,Liu Yi-Dong,Li Shi-dong,Min Yong-Gang
Traditional lithium-ion batteries suffer from poor cycle and rate performance due to low structural stability and the sluggish charge transfer kinetics of cathode during the lithiation and delithiation processes. Polyimide (PI) electrode, known for high theoretical capacity, structural tunability, inherent safety feature and sustainability, have garnered significant attention, offering a promising solution in addressing these issues. Nevertheless, the intrinsic insulation characteristic restricts the capacity of PI material. The emergence of two-dimensional layered Ti 3 C 2 T x MXene with low charge transfer resistance and high electrocatalytic activity is highly suitable for enhancing the electrochemical performance of PI. Therefore, integrating PI with few-layered MXene would combine PI’s abundant redox-active sites with MXene’s excellent conductivity, creating a robust electrode with high capacity, ultrafast kinetics, and cycle durability. Based on this strategy, the hybrid material composed of naphthalene-based PI (NPI) with stable molecular structure and few-layered MXene, denoted as NPI@MXene, has been successfully designed and fabricated through the eco-friendly solid-state polycondensation approach. By adjusting the feed ratio of reactants, the hybrid electrode with 10 wt% MXene (NPI@10%MXene) demonstrates the layer-plus-island-like stable structure and good interaction between NPI and MXene, which delivers the highest rate capacity. Even subjected to a high-current density of 8 A g −1 , the NPI@10%MXene composite maintains 74% (~ 84 mAh g −1 ) of its initial capacity. It also exhibits long-life cycling stability with ~ 77% retention after 5000 cycles (1 A g −1 ). Moreover, the NPI@10%MXene composite reveals enhanced capacitive effect and fast Li + diffusion coefficient during the discharge/charge process (1.43 × 10 –9 /1.43 × 10 –9 cm 2 s −1 , respectively), outperforming those of pristine NPI. The above experimental results highlight remarkable potential of NPI@10%MXene for application in ultrafast Li + storage. Thus, NPI@10%MXene cathode offers a viable strategy to reconcile rapid electrochemical reaction with long-term stability in sustainable rechargeable batteries.
✓ 已验证
DOI
高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2023
·
IF 2.3
Zengze Chu,Yu Lu,Chen Liu
The synthesis of laser-induced graphene (LIG) from polyimide (PI) sheets provides a cost-effective and direct patterning approach for graphene-based electronic devices. However, the fabrication of LIG-based electrodes toward photovoltaic applications urgently needs to be explored. Herein, facile high-yield production of the porous LIG counter electrodes for DSSC applications was demonstrated by laser induction of PI film. The electrical conductivity and electrocatalytic activity of the LIG electrodes increased with the applied laser power due to the formation of a unique hierarchical porous graphene structure with abundant edges and defects, which resulted in an evident improvement in power conversion efficiency (PCE) of 3.56%. In addition, a one-step in situ synthesis of Pt/LIG composite was further demonstrated by laser irradiation on the PI sheet with low loadings of Pt precursor to obtain a Pt-less counter electrode. It is found that the Pt/LIG composite electrode-based DSSC achieved a higher PCE of 3.80%, which is comparable to that of pure Pt-based DSSC. This study demonstrates that the porous LIG from PI films is a promising candidate as a carbonaceous counter electrode for DSSCs.
✓ 已验证
DOI
高影响因子
CARBON
·
2026
·
IF 12.7
Kewei Su,Xin Wang,Ye Zhu,Huiyi Yan,Baichuan Wang,Yangyang Tian,Qingyuan He,Pengsong Sun,Runlang Li,Dongchen Zhao,Xiaoming Chen,Jie Zhang,Jinyou Shao
Temperature-driven pore size engineering (4.4–33.5 μm) systematically optimizes electromagnetic wave absorption • Large pores mitigate excessive permittivity for impedance matching, while ultrafine pores compensate for insufficient intrinsic attenuation. • Genetic algorithm-optimized multilayer architectures achieve an exceptional minimum reflection loss of −68.85 dB at 3.5 mm and an ultra-broad effective absorption bandwidth of 14.05 GHz at 10 mm. While the pore architecture of aerogels significantly impacts electromagnetic wave (EMW) absorption, current designs predominantly focus on pore orientation, leaving the quantitative relationship between pore size and electromagnetic performance largely unexplored. To bridge this gap, we develop cross-scale graphene/polyimide aerogels, integrating temperature-driven microscale pore size engineering with macroscopic multilayer configurations. At the microscale, tuning the freezing temperature enables systematic regulation of pore sizes from 4.4 to 33.5 μm, thereby elucidating a complementary loss mechanism wherein large pores mitigate excessive permittivity to optimize impedance matching, while ultrafine pores compensate for insufficient intrinsic attenuation. Consequently, the optimal single-layer aerogel achieves an effective absorption bandwidth ( EAB ) of 7.05 GHz, alongside a minimum reflection loss ( RL min ) of −54.58 dB. At the macroscale, a genetic algorithm is employed to systematically explore the parameter space—encompassing pore size, thickness, and filler loading—to construct optimized multilayer architectures. The resulting multilayer aerogels (MAs) exhibit a remarkable RL min of −68.85 dB alongside an EAB of 8.83 GHz at 3.5 mm, while achieving an ultra-wide EAB of 14.05 GHz coupled with a strong RL min of −54.63 dB at 10 mm. Furthermore, the optimized MAs demonstrate an exceptional radar cross-section reduction capability of up to 45.91 dB, establishing a robust design paradigm for next-generation EMW absorbers. Download: Download high-res image (281KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
THIN-WALLED STRUCTURES
·
2026
·
IF 8.3
Jia Chen,Zhexi Li,Xianbo Hou,Rongzhu Xia,Xuelei Fang,Shuyan Nie,Shaowei Zhu,Tao Liu,Keyu Zhu,Liming Chen
A novel integrally molded PIA/APH composite cylindrical shell is proposed. • The structure achieves a transition from brittleness to elastoplastic response. • Tensile strength and specific shear modulus increase by 5.28 and 66.32 times. • The composite shows enhanced flame retardancy and efficient thermal insulation. • It shows potential for lightweight, load-bearing, and thermal insulation. High-performance curved-shaped special components, as a focus in the aerospace field, the development of ultra-light, heat-insulating and flame-retardant cylindrical shells holds significant engineering significance. Herein, we report a novel integrally formed polyimide aerogel/aramid-paper honeycomb (PIA/APH) cylindrical shell, achieved by infusing PIA into an APH to create a monolithic PIA-rich cylindrical sandwich structure. This design yields an ultra‑lightweight cylindrical shell with a density as low as 0.11-0.20 g/cm³, creating a synergistic interplay between mechanical load‑bearing and thermal insulation that yields mutually reinforcing performance benefits: the rigid honeycomb framework suppresses aerogel shrinkage by 41.96% and boosts tensile failure strain 5.63 times, transforming the brittle PIA into a tough, ductile material exhibiting distinct elastic, yield, and hardening stages under lateral quasi-static compression and drop-weight impact. Concurrently, the PIA reinforcement increases the specific shear modulus of APH by 1.73 times and shear strength by 4.57 times. through improved interfacial load transfer and stress redistribution. Notably, the composite retains good post-damage thermal insulation, attributed to greater residual wall thickness after deformation, while flame retardancy is improved with self-extinguishing duration reduced from 10.27 s (APH) and 6.20 s (PIA) to 5.20 s. The fabricated PIA/APH cylindrical shell holds considerable promise for mechanically and thermally coupled aerospace environments, offering a new paradigm for multifunctional lightweight structure design.
✓ 已验证
DOI
高影响因子
Nano Materials Science
·
2026
·
IF 20.5
Xin Li,Jing-hui Yang,Wen-jin Hu,Long-fei Tian,Nan Zhang,Yong Wang
High-temperature polyimide (PI) dielectrics with high energy density are urgently needed for capacitive energy storage fields. However, the breakdown strength ( E b ) and energy storage ( U e ) capabilities significantly deteriorate due to large conduction losses at high temperatures, limiting the practical applications of PI dielectrics. To address this issue, carbonized polymer dots (CPDs) with tunable band gaps were introduced into PI to prepare CPDs/PI composites. CPDs can also form physical entanglement and chemical crosslinking with PI molecular chains. Moreover, the wide band gap CPDs provide the composites with a higher energy barrier at the electrode/composite interface, effectively inhibiting the charge injection. Additionally, longer alkyl chains on the surface of CPDs are more conducive to their entanglement with PI molecular chains, which facilitates the formation of charge traps. Among the composites, the 12CPDs exhibit the largest band gap and longest alkyl chains. As a result, at a high temperature of 150 °C, the 12CPDs/PI0.2% film exhibits an exceptional U e of 4.0 J cm −3 , which is 2.47 J cm −3 higher than that of pristine PI with a U e of 1.53 J cm −3 , respectively.
✓ 已验证
DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Caizhe Sun,Mei Li,Yuefei Zou,Xiaolin Xue,Qunhao Wang,Jiangqi Zhao,Wei Zhang,Canhui Lu
Currently, the advancement of aqueous zinc-ion batteries (ZIBs) is extensively hampered by challenges such as formation of zinc dendrites and side reactions on the zinc anode. As a crucial element of batteries, the separator can greatly affect battery performance, and the present study aims to develop a novel separator to tackle the above challenges in aqueous ZIBs. Toward this end, a nonwoven fabric of fluorinated polyimide/cellulose (fPC) composite nanofiber is succesfully manufactured through electrospinning. The resultant membrane exhibits a uniform pore structure, abundant zincophilic groups, high hydrophilicity and excellent mechanical properties. When used as a separator for aqueous ZIBs, the fPC membrane can effectively promote zinc ion transport and achieve uniform Zn 2+ deposition, effectively and concurrently suppressing both dendrite formation and side reactions. As a consequence, the aqueous Zn||Zn symmetric cell assembled with fPC exhibits superior cycle stability over 1800 h at 1 mA cm −2 /1 mAh cm −2 , while the aqueous Zn||MnO 2 full cell displays excellent rate performance and stable cycling performance, suggesting the high potential of fPC in real-world aqueous ZIB applications.
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Menghan Li,Ming Niu,Zhan Liu,Hongyang Li,Zhonghao Rao
Lithium-ion batteries (LIBs) serve as a critical energy source in electric vehicles and distributed energy storage systems. However, they face significant safety concerns caused by thermal runaway (TR) and its propagation. These issues severely threaten system stability and operational safety. Aerogels have attracted widespread attention for their exceptional thermal insulation properties. Among them, polyimide (PI) aerogels combine the advantages of low thermal conductivity inherent to aerogels along with the high decomposition temperature and self-extinguishing properties of PI. This unique property makes them ideal thermal-insulating and flame-retardant materials that can mitigate the propagation of TR. However, the relatively poor flame resistance of PI aerogels presents a major obstacle to their wider practical application. To address this challenge, this study developed PI aerogels with excellent flame retardant properties. Specifically, ammonium polyphosphate, an intumescent flame retardant, was incorporated into the aerogel system to fabricate a composite aerogel with synergistic thermal insulation and flame-retardant capabilities. The results showed that when applied to LIBs modules, the 2 mm-thick PI aerogel successfully delayed the TR propagation, extending the TR triggering interval between adjacent batteries from 10 s to 595 s, with an average delay of 585 s. This indicates that the material constructed in this study demonstrates great potential for improving the safety of battery systems.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Changxu Yang,Jiahe Zhang,Shuo Zhang,Zhenyang Song,Duanyi Li,Chuqin Wang,Ke Wang,Jingang Liu
Si/C anode is regarded as a competitive candidate for next generation lithium-ion batteries due to its outstanding specific capacity. However, the practical application of Si/C anode is still obstructed by its significant volumetric variation during charging and discharging. Numerous studies have demonstrated that polyimide (PI) can effectively mitigate volumetric deformation. However, the majority of these investigations have predominantly utilized insoluble PI, whose high-temperature imidisation process would produce large internal stresses and holes that are detrimental to the performance of the battery. In this study, two types of soluble polyimides were synthesized and applied to Si/C anode: a fluorine- and silicon-containing variant and a fluorine- and amino-group-containing variant. Both PI-FS and PI-FN have relatively well bonding properties. Meanwhile, PI-FN, which introduces amino groups, has lower energy gap and better conductive ability. Compared with PVDF, the PI-based binder changes the component distribution of the solid electrolyte interface and significantly improves the cycling stability of the Si/C anode.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Yurui Deng,Yuelei Pan,Caihong Li,Zhongxin Zhang,Lunlun Gong,Yangyang Fu,Long Shi,Heping Zhang,Xudong Cheng
Separator is an important component in lithium-ion batteries, and it plays a critical role in ensuring the overall thermal safety and electrochemical performance of a battery . To date, the development of safe and robust lithium-ion batteries is still hindered by the commercial polyolefin membrane due to its poor thermal stability and inferior electrolyte wettability . Thus, to address this shortcoming, an advanced polyimide aerogel separator was designed by simple one-pot reaction via co-precursor and cross-linking methods in this work. Based on molecular structure designation and gelation time control, the as-prepared polyimide aerogel separator (C-PI separator) possessed high porosity, good flexibility, excellent thermal stability, and superior electrolyte wettability, which are essential attributes of a high-performing separator. LiFePO 4 |Li metal battery was later assembled with C-PI separator, and the cell demonstrated outstanding long-term cyclic performance (>1000 cycles at 1C with 93.6 % retention). Compared with PE separators, the NCM523-graphite pouch cell assembled with C-PI separators exhibited high thermal stability with a higher thermal runaway temperature (204.9 °C vs. 140.4 °C) and a lower maximum temperature rise (0.06 °C/min vs. 8 °C/min), demonstrating its application potential in scenarios with high requirements for safety. Furtherly, the thermal runaway mechanisms of the full cells were explored and explained in this work.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Jiaqi Geng,Xiaoyang Yu,Zhitan Huang,Faman Lin,Brij Mohan,Yanxin Lv,Wei Sun
Chloramphenicol (CAP) is a broad-spectrum antibiotic whose overuse poses environmental and public health risks, making rapid detection crucial. This study introduced a nanocomposite of CeO 2 , SiO 2 , and MoC nanoparticles in situ embedded in laser-induced graphene (CeO 2 -SiO 2 -MoC-LIG). The nanocomposite was synthesized via a laser-induced method using a polyoxometalate-based metal-organic compound and a polyimide mixture, and was further characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and Brunauer-Emmett-Teller analysis. The incorporation of nanoparticles significantly improved the conductivity, electrochemical response, specific surface area, and the number of active sites at the LIG electrode interface. Under optimal conditions, the CeO 2 -SiO 2 -MoC-LIG electrode enabled detection of CAP via linear sweep voltammetry, achieving a wide detection range of 0.1 μM–1.0 mM and a low limit of detection of 33 nM. The electrode also exhibited excellent selectivity against common antibiotics (peak current changes <12.1% at five-fold concentrations of interferents) and good stability (retaining 95.6% of the initial response after 9 days). Furthermore, this flexible electrode was successfully applied to monitor CAP in tap water and pork samples with satisfactory recoveries (96.3%–102.8%) and relative standard deviations below 3.34%, presenting a novel approach to designing flexible electrochemical devices.
✓ 已验证
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2026
·
IF 13.5
Bo Liang,Yuyijian Zhao,Siyu Wang,Shihan Huang,Fangke Zhou,Chuankun Zhang,Yue Wang,Xiaoming Guo
Herein, a novel strategy for fabricating microwave absorption materials via molecular-level design that synergistically regulates dielectric and magnetic losses. The method utilizes a polyimide precursor containing both carboxyl and benzimidazole functional groups as the key component. Through an ice-templating process followed by in-situ ion exchange, Ni 2+ ions are uniformly incorporated into the polymeric skeleton. Subsequent thermal imidization and carbonization yield nitrogen-doped two-dimensional carbon nanosheets embedded with uniformly dispersed Ni/NiO nanoparticles (BPCN@Ni/NiO). This material exhibits significantly superior microwave absorption properties compared to its counterpart synthesized without the benzimidazole structure (NPCN@Ni/NiO). BPCN@Ni/NiO achieves a remarkable minimum reflection loss ( RL min ) of −69.02 dB with effective absorption bandwidth ( EAB ) of 8.92 GHz (8.28–17.2 GHz). Microstructural analyses confirm its three-dimensional interconnected nanosheet architecture, highly dispersed Ni/NiO species, and homogeneous elemental distribution. The performance enhancement is attributed to the synergistic complexation of Ni 2+ ions by benzimidazole and carboxyl groups, which enables efficient loading and uniform dispersion of nickel species, thereby optimizing impedance matching. Furthermore, the unique 2D conductive network, abundant heterogeneous interfaces (C/Ni/NiO), defect-induced dipole polarization, and magnetic coupling between Ni and NiO collectively contribute to synergistic multiple loss mechanisms, ultimately endowing the material with excellent microwave attenuation capability. This work offers a new pathway for designing lightweight, efficient, and broadband carbon-based composite absorbers through precise molecular engineering.
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2026
·
IF 5.2
Jikang Liu,Yao Wang,Guoli Tu
As is known, colorless polyimide (CPI) is usually regarded as a substrate material for transparent flexible printed circuit boards (FPCB) as a high-performance optical-grade polymer film. The problem of CPI films being nonwetting with the metal interface in the preparation of transparent FPCB urgently needs to be solved. The 6FDA and 3FPODA monomers containing flexible structures were selected to prepare CPI films with TFDB by the copolymerization reaction for improving the optical properties. Two series of copolymerized CPI films (3F6FP/C-PI-x and 3F6FP/H-PI-x) with different ratios of dianhydride were prepared by using chemical imidization and thermal imidization methods. The solubility, optical properties, thermal properties, and mechanical properties of the two series of CPI films were characterized to explore the introduction of the 3FPODA monomer on the optical, thermal, and mechanical properties of CPI films. According to the research on the two series of copolymerized CPI films, it was found that the introduction of 3FPODA and 6FDA with a copolymerization method could improve the thermal and mechanical properties of optical-grade CPI films significantly. The optical, thermal, and mechanical properties of the CPI films prepared by the chemical imidization method are superior to those of the CPI films prepared by the thermal imidization method, which indicates that the chemical imidization method is more suitable for preparing such optical-grade CPI films. Based on the most excellent comprehensive performance, the optical indicators and other key properties of the 3F6F/C-PI-4 CPI film could meet the requirements for preparing transparent FPCB.
✓ 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）