Journal of Physical Chemistry C
·
2022
·
IF 4.177
Zhenya Wang,Yang Yu,Weijin Kong,Lunhua He,Limei Sun,Xiangfeng Liu
Improving the electronic conductivity and lithium-ion diffusion ability is quite essential for Li4Ti5O12 (LTO) anode materials. Herein, we propose a synergistic strategy to facilitate Li+ insertion/extraction and conductivity by integrating Na2TiO3 coating, Na+ doping, and oxygen vacancy engineering. The rate capability (115 mAh/g vs 70 mAh/g at 5 C) and cyclic performance (91% retention vs 58% at 10 C after 500 cycles) have all been enhanced greatly, and the underlying modulation mechanism has been revealed. First, the Na2TiO3 coating layer mitigates the corrosion of the electrolyte and inhibits the side reactions between the electrode and electrolyte. Second, Na+ doping optimizes the crystal structure, expanding the lattice parameter as well as the unit cell volume and decreasing the bond length of Li1–O, which effectively facilitates Li+ diffusion. In addition, the introduction of oxygen vacancies promotes more Ti4+ to be reduced to Ti3+ and narrows the band gap of LTO material, thus improving the electronic conductivity. This “three-in-one” synergistic strategy sheds some new light on tuning crystal structure and electronic structure for designing high-performance electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Jieting Ding,Hao-Fan Wang,Kui Shen,Xiaoming Wei,Liyu Chen,Yingwei Li
The applications of metal-organic frameworks (MOFs) in electrocatalysis are limited by the perfect crystalline nature with insufficient coordinatively unsaturated sites and low electronic conductivity. Here, we report an electrosynthesis method to induce rapid assembly of amorphous MOFs on carbon cloth (denoted as a MnFc’/CC), achieving the amorphization of MOFs with rich active sites and high electronic conductivity. The long-range disordered structure of a MnFc’/CC forms a large number of oxygen vacancies to modify the coordination and electronic structures of Mn sites. In the electrocatalytic hydrazine oxidation reaction (HzOR), the a MnFc’/CC electrocatalyst exhibits superior activity to its crystalline MOF counterparts. Density functional theory calculations reveal that the unsaturated Mn centers present in aMnFc’/CC facilitate efficient electron transfer while simultaneously lowering the free energy of the rate-determining step in the HzOR process.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Yuanlang Wan,Xuefang Xie,Shuang Zhou,Weihang Li,Jingkang Ma,Yaqin Zhou,Yijian Song,Ji Zhou,Anqiang Pan
Li3VO4 (LVO) presents significant advantages in cost and capacity, making it a promising candidate for next-generation lithium-ion battery (LIB) anodes. However, its low electronic conductivity hampers practical applications. Herein, we report a Sm-modified Li3VO4/C composite (LSVO/C) designed for high-performance LIBs. Sm doping introduces additional defects and optimizes the electronic structure of Li3VO4, resulting in a significantly enhanced electronic conductivity (2.94 × 10–3 S cm–1) of the composites. Furthermore, the carbon-fiber-based framework effectively maintains structural stability during cycling, facilitating superior ion transport kinetics. Benefiting from these enhancements, the LSVO/C composite achieves remarkable discharge capacities of 379.5 mAh g–1 at 0.25 C and 260.1 mAh g–1 at 12.5 C. Additionally, an LSVO/C||NCM111 full cell, using LiNi1/3Co1/3Mn1/3O2 (NCM111) as the cathode, retains a discharge capacity of 50.5 mAh g–1 after 1000 cycles at 3.0 C, highlighting the potential of LSVO/C for practical applications. This unique method in preparing anode material will open new gates for highly efficient LIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Rongfeng Hu,Zhao Zeng,Shihao Jin,Kaixu Yang,Fei Liu,Yun Yi,Jianxin Cao
LiFe1–xMnxPO4 (0 < x < 1) has a high operating voltage range and theoretical energy density, but its actual capacity decreased due to its low electronic conductivity. To overcome this problem, we successfully prepared LiFe0.4Mn0.6PO4/C (LFMP/C) with a uniform carbon coating by a one-step solvothermal method using bamboo shavings as the carbon source. The results showed that heating at a reaction temperature of 180 °C for 18 h was the optimal synthesis condition to obtain LFMP/C. The addition of bamboo shaving-based carbon was effective in inhibiting excessive grain growth and reducing particle size. The disordered carbon layer enhanced the surface conductivity by connecting the surfaces of the particles. The synergistic effect of the nanoparticle size and the pores distributed around the particles increased the specific surface area and thus improved the contact area between the active substance and the electrolyte. Furthermore, there were improvements in electronic conductivity and ionic mobility. LFMP/C-16 showed initial discharge capacities of 150.1 and 143.5 mAh·g–1 at rates of 0.1 and 0.2C, respectively, with a capacity retention rate of 97.73% after 100 cycles, indicating excellent cyclic performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Haoqing Tang,Lingxing Zan,Zhiyuan Tang
Well-prepared pristine Li 2 ZnTi 3 O 8 has a great potential to be employed as anode material, which possesses a lager lithium intercalation capacity and excellent rate performance for Li-ion batteries because of its higher electronic conductivity. To obtain an optimal preparation condition, the Li 2 ZnTi 3 O 8 anode materials were prepared and annealed in air and nitrogen atmospheres for comparison. To our surprise, Li 2 ZnTi 3 O 8 materials annealed in nitrogen atmosphere exhibits excellent stable cycling life and rate performance indicated by a higher reversible capacity of 181.9 mAh g −1 over 100 cycles at 2000 mA g −1 because it can introduce the oxygen defect and improve the intrinsic electronic conductivity. These superior electrochemical performances are primarily attributed to the ameliorated electronic conductivity, which derives from the change of Ti valence from +4 to +3. Besides, a novel LiNi 0.5 Mn 1.5 O 4 /Li 2 ZnTi 3 O 8 full cell is configured and it exhibits good rate capacity under 2.0–4.6 V at different charge rates and discharged at 2.0 A g −1 . This full cell system exhibits excellent capacity at the high charge and discharge rates and it could be suitable candidate for application in the large capacity storage devices. Moreover, it can also be widely used in the field of the fast charge and discharge electronic products.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2016
·Vol. 9
·期 3
·857-865
·
IF 8.893
Zhou Liyan,Yan Shancheng,Pan Lijia,Wang Xinran,Wang Yuqiao,Shi Yi
Two-dimensional transition-metal dichalcogenides (WS 2 and SnS 2 ) have recently joined the family of energy storage materials (for lithium-ion batteries and supercapacitors) as a result of their favorable ion intercalation. So far, challenges in the synthesis of phase-pure WS 2 , restacking between WS 2 nanosheets, low electronic conductivity, and the brittle nature of WS 2 , severely limit its use Li-ion battery application. Herein, we develop a facile low temperature solution sulfuration process to improve battery performance dramatically. The sulfuration process is demonstrated to be effective in converting WO 3 impurities to WS 2 , and in repairing the sulfur vacancies, to improve cyclability and rate capability. Lithium-ion battery measurements demonstrate that the stable capacity of the WS 2 anode could be enhanced by 48.4% via sulfuration reprocessing, i.e., from 381.7 to 566.8 mAh/g at a relatively high current density of 0.8 A/g after 50 cycles. We further show that the sulfuration process can be readily extended to other dichalcogenides, and may provide a class of versatile electrode materials for lithium-ion batteries with improved electrochemical characteristics.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guanhua Zhang,Xiaojing Li,Donghai Wei,Huihuang Yu,Jinghua Ye,Song Chen,Wen Zhang,Jian Zhu,Xidong Duan
As a representative two-dimensional layered material, In 2 Se 3 attracts an increasing research interest because of the virtue of high theoretical lithium-ion storage capacity. However, the development of In 2 Se 3- based anode is primarily confined by the poor electronic conductivity and inevitable volume variations. Moreover, the lithium − ion storage mechanism of In 2 Se 3 - based electrode is still not clear. Here, we report a facile construction strategy for metal-organic frameworks (MOFs)-derived In 2 Se 3 nanocrystals encapsulated in porous nitrogen − doped carbon conductive matrix (In 2 Se 3 /PNC). The In 2 Se 3 /PNC with porous structure and rich N − doped carbon affords highly efficient channels for rapid transportation of ions and electrons. Meanwhile, as the heterogeneous structure provides sufficient void space to relieve the internal mechanical stress during the repeated charge–discharge processes. Thus, the optimized In 2 Se 3 /PNC − 800 (annealed at 800 °C) electrode exhibits a capacity as high as 1038 mAh/g at 200 mA g −1 , remarkable cycling stability over 2000 cycles and a comparable high-rate capability. Moreover, the reaction mechanism of the In 2 Se 3 with Li + is revealed through in-situ XRD and density functional theory (DFT) simulations. This study may present broad opportunities for reliable construction of high-capacity selenium-based composites for energy storage.
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
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Jiepeng Chen,Yun Huang,Jiapin liu,Chengwei Li,He Zheng,Xi Xu,Lei Fu,Xing Li,Mingshan Wang,Yuanhua Lin,Haijun Cao
The sodium super ion conductor (NASICON) structure materials have attracted extensive attention because of its open three-dimensional crystal network framework and fast sodium ion migration rate. However, the poor electronic conductivity due to the presence of phosphate groups and the consequent high cost have been a barrier to commercialization. In this work, Na 4 MnV(PO 4 ) 3 (NMVP) with three-dimensional porous structure is synthesized in situ using Aspergillus niger as a biological template (noted as NMVP/ANDC). The cell wall of Aspergillus niger is rich in hydroxyl groups , which can adsorb metal ions well, so that NMVP particles can be synthesized on Aspergillus niger without stacking and agglomeration. NMVP grows along Aspergillus niger mycelium has a spongy-like three-dimensional porous network structure, which helps the contact between active materials and electrolyte, reduces the migration distance of sodium ions, and improves the conductivity of active materials. Therefore, NMVP/ANDC has good rate performance and cycle stability. It can provide 109 mAh g −1 at 0.5 C and 79.6% capacity retention after 3000 cycles at 5 C. The biological template method is proposed in this paper opens up a simple way for the preparation of other three-dimensional porous network structural materials.
研究领域:
材料科学
·
电化学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Jinkui Li,Hong Li,Jiao Li,Shixiang Yuan,Mingwu Xiang,Junming Guo,Wei Bai,Zixian Yang
Porous carbon matrixes have been widely recognized as the simple and effective host materials for encapsulating sulfur and enhancing electronic conductivity in lithium sulfur batteries . Herein, a waste honeycomb is used to prepare in-situ N-doping hierarchically porous carbon materials by systematically regulating the simultaneous activation/carbonation temperature. The high-temperature is conducive to promoting the porous structural formation and high graphitization of carbon materials. As the increased carbonation temperature, the N-heteroatom doping content decreases and the graphitization degree increases gradually. The carbon material prepared at 900 °C shows the abundant hierarchically porous structure with high specific surface area of 1932.9 m 2 g −1 and large pore volume of 1.292 cm 3 g −1 , hence can well accommodate the sulfur and capture the soluble polysulfides by the porous adsorption and bonding effect of in-situ doped nitrogen atoms . Besides, the improved graphitization endows the carbon material with a high electronic conductivity , boosting the fast electron transport. Due to these structural merits, the optimized porous carbon/sulfur composite cathode shows a high initial discharge capacity of 969.3 mAh g −1 at 0.2C. Even at high current rate of 1.0C, the relatively high discharge reversible capacity of 492.2 mAh g −1 is still maintained after 500 cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jun Cong,Shao-hua Luo,Peng-yu Li,Xin Yan,Li-xiong Qian,Sheng-xue Yan
Na 3 V 2 (PO 4 ) 3 (NVP) has become a hot material in the research field of sodium-ion batteries (SIBs) as a result of its unique structural advantages. Unfortunately, the poor electronic conductivity and ion diffusion ability fundamentally limit the practical development of NVP. Considering the above defects, a series of Li + doped Na 3−x Li x V 2 (PO 4 ) 3 /C cathode materials for SIBs are synthesized through hydrothermal assisted sol–gel method. The cell volume steadily decline with the raise of Li + doping amount, which is consistent with the usual doping effect. Moreover, with the increase of lithium doping amount, Li + preferentially occupies Na (2) site and then occupies Na (1) site. Through the first principles calculation, it is clear that the introduction of Li + can significantly reinforce the conductivity of the material system and diminish the electron localization phenomenon. The analysis of (1 1 6) crystal plane by TEM shows that Li doping will reduce the interplanar spacing. The change of V valence during the charge–discharge process of Na 2.8 Li 0.2 V 2 (PO 4 ) 3 /C is consistent with that of NVP by V element XANES characterization. There is no conventional phase transition phenomenon in the ex-situ XRD high-voltage charging state. The above facts indicate that lithium doping obtains a stable solid solution NVP. The electrochemical test results show that Na 2.8 Li 0.2 V 2 (PO 4 ) 3 /C can provide an amazing reversible capacity of 116.9 mAh/g (theoretical capacity of 117 mAh/g) and capacity retention rate of 99.82 % after 500 cycles. GITT results show that Li + can significantly increase the Na + diffusion coefficient of the material. Such excellent electrochemical performance is attributed to the fact that the doping of Li + activates the activity of Na + in Na (2) site and improves the reaction efficiency.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 13
·2110264
·
IF 18.808
Yinghao Wu,Tian-Yu Sun,Tianhao Ge,Wenjie Zhao,Liang-Feng Huang
The structural defects on graphene grown on a metal substrate via chemical vapor deposition can readily stimulate severe galvanic corrosion phenomena. For any defect passivation method that can be technologically promising for superior corrosion-resistant graphene coatings, efficiency and accuracy are two critical but still challenging requirements. In this work, the authors design a rapid processing method (within just 15 min) that can accurately heal various structural defects of different types and sizes on graphene coating, where the hydrophobic 1 H ,1 H ,2 H ,2 H -perfluorooctanethiol (PFOT) molecules are self-assembled onto the defect sites. The surface morphologies, atomic bonding states, and defect-healing mechanism are deeply understood by comprehensive experimental characterizations and first-principles calculations. Both weak physical PFOT-pristine graphene bonding and strong covalent PFOT-defect bonding are two microscopic factors that enhance defect healing efficiency and accuracy. Spatially resolved electronic and electrochemical measurements show that the defect-healing not only effectively suppresses galvanic corrosion phenomena during both short-term and long-term tests, but also well preserves the superior electronic conductivity of pristine graphene. The defect healing strategy proposed here can find its wide potential applications in the fields like electro-industry, coating, and sensors that require the graphene coatings having both superior corrosion resistance and electronic property.
研究领域:
材料科学
·
表面化学
·
防腐蚀技术
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Xiaojun Luo,Qinxia Liu,Lei Lei,Wei Xia,Ya-Meng Yin,Xue-Qian Wu,Cai-Hong Yang,Ruan Chi,Dong-Sheng Li
Na 3 V 2 O 2 (PO 4 ) 2 F (NVPOF) as a prospective candidate for sodium-ion battery cathodes, faces practical challenges for its inherently low electronic conductivity, which impedes fast reaction kinetics and diminishes its sodium storage efficiency. To address these limitations, we introduce an in-situ interface engineering strategy for NVOPF by integrating 1D hydroxylated carbon nanotubes (CNTs) onto the surface of NVOPF nanosheets. The CNTs are arranged in-situ in multiple directions and significantly enhance adhesion to the NVOPF nanosheets via [PO 4 ] 3‒ ‒CNTs linkages, establishing a robust and conductive interface. This strategy effectively mitigates the aggregation of NVOPF nanosheets, ensuring optimized electronic contact and a persistent, efficient charge-transfer network within the composite. The resultant NVOPF-15%CNTs composite exhibits enhanced rate performance (88.01 mAh g ‒1 at 50 C) and excellent cyclability (retaining 82.4% capacity after 10000 cycles at 50 C). Comprehensive experimental and theoretical analyses confirm that the designed conductive interface accelerates charge-transfer kinetics and preserves structural integrity. This study provides valuable insights into optimizing NVOPF cathode and suggests a versatile approach applicable to improving other cathode materials.
研究领域:
材料科学
·
电化学
✓ 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）