ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Xing Xu,Yunlong Xu,Huang Zhang,Mandi Ji,Hui Dong
The NiO doped LiFePO 4 /C composite was synthesized by a simple solid state method. The structure and morphology of synthesized particles were characterized by XRD, Raman spectrum , SEM, TEM and EDS. Electrochemical performance of the pristine and nickel oxide modified samples was evaluated by galvanostatic charge-discharge test, CV , and EIS . The results indicate that NiO doped LiFePO 4 /Li type coin cell exhibits improved specific capacity and cycle stability, especially at high rates. Among all the modified samples, the 5.0%wt NiO doped sample shows the best electrochemical performance, which achieves a specific capacity of 129 mA h g −1 at 1 C current rate due to the modest graphitization of carbon layer on the surface of LiFePO 4 particles. The results indicate that nickel oxide modification is an effective way to improve the electrochemical performance of LiFePO 4 /C cathode materials for lithium ion batteries .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2022
·
IF 0.836
Yuanchao Cheng,Lei Zhou,Xiaolan Cai,Xudong Cui,Shaopeng Wu,Wenhao Pan,Wenhao Li
In this paper, high-energy ball milling method was used to prepare LiFePO4/C precursor and high temperature solid phase method to prepare LiFePO4/C cathode material. The influence of mixing process on the electrical performance and synthesis temperature of LiFePO4/C cathode material was studied by changing the ball milling time.The ball milling time selected in this paper is 0, 0.5, 1, 1.5, 2 h, and XRD, SEM and particle size analysis are used to characterize the properties of LiFePO4/C powder. The research results show that the LiFePO4/C powder obtained under the ball milling time of 1 h has the smallest particle size and uniform distribution. The XRD results also show that the LiFePO4/C phase obtained under this condition has good purity and crystallinity.The electrical performance of the LiFePO4/C material prepared after high-energy ball milling are tested. The results show that the first discharge specific capacity at 0.2 C rate is 163.3 m·Ah/g, which is 19.7% higher than that of the non-ball milled sample.The TG-DTA curve results show that the reaction temperature of the sample after high-energy ball milling is 454 °C, and the mass loss ends at about 570 °C. Compared with the sample without ball milling, the reaction temperature is reduced by 60 °C.The results of this study show that the preparation of precursor by high-energy ball milling can effectively improve the electrical performance of LiFePO4/C materials and reduce the material synthesis temperature.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 7
·4720-4727
·
IF 1.354
Chen Li-Li,Shen Xiang-Qian,Jing Mao-Xiang,Zhu Sheng-Wen,Pi Zhi-Chao,Li Jing-Quan,Zhai Hong-Ai,Xiao Ke-Song
A LiFePO4/C composite fiber membrane was fabricated by the electrospinning method and subsequent thermal treatment. The thermal decomposition process was analyzed by TG/DSC, the morphology, microstructure and composition were studied using SEM, TEM, XRD, Raman, respectively.
The results indicated that the prepared LiFePO4/C composite fibers were composed of nanosized LiFePO4 crystals and amorphous carbon coatings, which formed a three dimensional (3D) long-range networks, greatly enhanced the electronic conductivity of LiFePO4
electrode up to 3.59× 10−2 S · cm−2. The 3D LiFePO4/C fiber membrane could be directly used as a binder-free, self-standing cathode for lithium-ion battery, and exhibited an improved capacity and rate performance. The LiFePO4/C
composite electrode delivered a discharge capacity of 116 mAh·g−1, 109 mAh·g−1, 103 mAh·g−1, 91 mAh·g−1, 80 mAh·g−1 at 0.1 C, 0.5 C, 1 C, 3 C, 5 C, respectively. And a stable
cycling performance was also achieved that the specific capacity could retain 75 mA·g−1 after 500 cycles at 5 C. Therefore, this LiFePO4/C composite fiber membrane was promising to be used as a cathode for power lithium ion battery.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xin Ren,Zhenfei Li,Jingrui Cao,Shiyu Tian,Kaicheng Zhang,Jianling Guo,Lizhi Wen,Guangchuan Liang
Mortar-like LiFePO 4 /C composites are synthesized by a ball milling-spray drying-carbothermal reduction method using polyethylene glycol (PEG) as the organic carbon source, dispersant , and reductive agent, while the carbon aerogel as the excellent conductive network. PEG enables the carbon aerogel to uniformly coat the primary particles, which restricts the overgrowth of primary particles' during the synthesis process. While the carbon aerogel provides a three-dimensional conductive network, and its porous structure can absorb more electrolyte. Moreover, the mortar-like secondary particles could further increase the specific surface of LiFePO 4 /C composites. The high speed of electron transfer and lithium-ion transportation can be achieved simultaneously for the Mortar-like LiFePO 4 /C composites. All these factors contribute to the outstanding rate performance (163.4 mAh g -1 at 0.2 C and 115.4 mAh g -1 at 15 C) and considerable cycling stability (99.3% of capacity retention after 300 cycles at 5 C/5 C). The Mortar-like LiFePO4/C composites combined with the evenly coated carbon aerogel are promising cathode materials for rechargeable lithium-ion power batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Yudi Mo,Junchen Liu,Chao Meng,Min Xiao,Shan Ren,Luyi Sun,Shuanjin Wang,Yuezhong Meng
The low electronic conductivity and poor Li + diffusion coefficient of conventional LiFePO 4 (LFP) materials severely impede its high-rate applications for lithium-ion batteries (LIBs). To break these limits, one novel poly(1,3-diethynylbenzene) (PAB) acetylenic carbon-rich polymer with extremely high-carbon content (96.75 wt%) and good solubility has been prepared by an oxidative coupling reaction. One definite advantage is that this carbon-rich PAB polymer will release, upon pyrolysis , very low amounts of gas, forming therefore uniform and dense highly conductive carbon network. Besides, the specific resistivity of continuous PAB-C layer can be as low as ∼0.01 Ω cm, which can effectively improve electrical conductivity and maintain mechanical integrity of LFP cathode. As a result, the prepared LFP@PAB-C nanocomposites with approximately 3.8 wt% carbon content and 2.5 nm carbon layer exhibit an excellent high-rate capability, e.g. even at a considerable discharge rate of 50 C, while the capacity can still be remained at 129.6 mA h g −1 . Moreover, the LFP@PAB-C nanocomposites also reveal a remarkable cycling stability with as high as 100.6% capacity retention at 20 C over 1000 cycles. This kind of LFP@PAB-C composite was demonstrated to be an ideal cathode material for high-power LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yuanyuan Ren,Limin Liu,Zhen Wang,De Li,Yong Chen
Compared with traditional centimeter-level electrodes, microelectrodes exhibit a small reaction area, high sensitivity, fast mass transfer rate, and low polarization current. However, current microelectrode preparation processes are very complicated and costly. Herein, we proposed a facile and universal method for fabricating single-particle microelectrodes. In the precursor solution, polyvinyl alcohol and ammonia were introduced as the polymeric binder and pore-forming agent, respectively. Through spaying-drying-sintering processes, the single-particle microelectrodes were successfully prepared for Li4Ti5O12 (LTO), LiCrTiO4 (LCTO), and LiFePO4/C (LFP/C), which showed excellent electrochemical properties. Furthermore, the single-particle microelectrode can be adopted to study the electrochemical oscillations of Li-ion batteries and assemble a full-cell microbattery as a potential next-generation microscale power source.
研究领域:
电化学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 10
·6983-6992
·
IF 3.9
Yiqiong Peng,Lingzhi Zeng,Shuai Dai,Feng Liu,Xi Rao,Yongping Zhang
Self-assembled lithium iron phosphate (LiFePO4) with tunable microstructure is an effective way to improve the electrochemical performance of cathode materials for lithium ion batteries. Herein, self-assembled LiFePO4/C twin microspheres are synthesized by a hydrothermal method using a mixed solution of phosphoric acid and phytic acid as the phosphorus source. The twin microspheres are hierarchical structures composed of primary nano-sized capsule-like particles (about 100 nm in diameter and 200 nm in length). The uniform thin carbon layer on the surface of the particles improves the charge transport capacity. The channel between the particles facilitates the electrolyte infiltration, and the high electrolyte accessibility enables the electrode material to obtain excellent ion transport. The optimal LiFePO4/C-60 exhibits excellent rate performance with discharge capacity of 156.3 mA h g−1 and 118.5 mA h g−1 respectively at 0.2C and 10C, and low temperature performances with discharge capacity of 90.67 mA h g−1 and 66.7 mA h g−1 at −15 °C and −25 °C, respectively. This research may provide a new pathway to improve the performance of LiFePO4 by tuning the micro-structures by adjusting the relative content of phosphoric acid and phytic acid.
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
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Guodong Du,Yingke Zhou,Xiaohui Tian,Guan Wu,Yakun Xi,Shengyu Zhao
The directional freeze casting technology has received increasing attention as a processing method to fabricate the aligned porous materials due to the advantages of easy operation and free of byproduct. Here, we innovatively applied the directional freezing technology to synthesize the 3D directional porous LiFePO 4 materials. The distinctive 3D directional porous structure of LiFePO 4 is templated from the aligned ice crystals frozen under the temperature gradient in liquid nitrogen . When used as a positive electrode material in lithium-ion batteries, the directional porous LiFePO 4 /C composite exhibits high reversible capacities of 162 mA h g −1 at 0.1 C and 72 mA h g −1 at 10 C, and a high capacity retention of 93.3% after 800 cycles at 1 C. The 3D directional porous LiFePO 4 /C is promising for application in lithium-ion batteries and the synthesis strategy could be potentially extended to prepare other high performance electrode materials.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Bingnan Song,Wei Chen,Ying Pu,Weiquan Li,Zhengshuo Zhan,Haisheng Fang,Yang Lei
Phosphorus (P) recovery from wastewater offers a sustainable solution for mitigating pollution and securing resources for applications like lithium-ion batteries, where ferric phosphate is a valuable precursor. This study evaluates iron electrolysis for P removal and recovery from acidic wastewater with high phosphate concentrations and medium Ca²⁺ levels. The results suggested that effective P removal and high-purity iron phosphate production can be achieved by varying initial pH, current density, and oxidation conditions. Importantly, slow Fe release rates (0.02–0.04 mmol L⁻¹ min⁻¹) favored ferric phosphate formation (71%–77% removal), while faster rates (0.16–0.46 mmol L⁻¹ min⁻¹) predominantly produced vivianite (∼65% removal). In addition, air flush can enhance dissolved oxygen flux, achieving 89% P removal under rapid Fe release but with mixed products. H₂O₂ addition improved in situ Fe(II) oxidation, achieving 92% P removal and purer ferric phosphate. Compared to chemical precipitation, which required pH adjustment and suffered from Ca co-precipitation, iron electrolysis produced purer ferric phosphate directly, without pH pre-adjustment. The recovered ferric phosphate showed excellent potential as a precursor for high-performance LiFePO₄/C cathode material. These findings position iron electrolysis as a promising approach for sustainable P recovery and resource valorization from wastewater.
研究领域:
环境科学
·
电化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2012
·
IF 4.805
Jing Su,Xing-Long Wu,Chun-Peng Yang,Jong-Sook Lee,Jaekook Kim,Yu-Guo Guo
A general and efficient hydrothermal strategy combined with a high-temperature carbon-coating technique has been developed for large scale synthesis of self-assembled LiFePO4/C nano/microspheres employing the biomass of phytic acid as a novel and eco-friendly phosphorus source. The LiFePO4/C nano/microspheres are investigated by SEM, TEM, EDS, XRD, Raman spectroscopy, and electrochemical techniques. A reasonable assembly process of the hierarchical structure is proposed on the basis of time-dependent experimental results. Because of the unique structure, the LiFePO4/C nano/microspheres show a high tap density of 1.2 g cm–3, a high reversible specific capacity of 155 mA h g–1 at 0.1 C, as well as excellent rate capability and cycling performance, exhibiting great potential as superior cathode materials in lithium ion batteries. The approach for the preparation of LiFePO4 by using PA as the phosphorus source may open new prospects for utilization of biomass to produce high performance cathode materials for lithium ion batteries.
研究领域:
材料科学
·
储能
·
纳米技术
·
电化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Rui Rui Zhao,Guo Zheng Ma,Li Cai Zhu,Ai Ju Li,Hong Yu Chen
In this paper, a novel hydroxyethylcellulose (HEC)-assisted carbon-coating method was developed to synthesize LiFePO 4 /C composites. The structure and morphological transformation of the as-prepared samples were studied using a combination of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The particles of the samples obtained were more homogeneous than the reference sample prepared without the addition of HEC and the coated carbon were more uniformly distributed on the LiFePO4 surface. In addition, the HEC-assisted sample exhibited higher capacities and better rate capability in the charge-discharge test, and the charge transfer resistance calculated from the electrochemical impedance spectra data was smaller.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Liang Ni,Jugong Zheng,Cancan Qin,Yanwen Lu,Panxing Liu,Tongfu Wu,Yuefeng Tang,Yanfeng Chen
Spherical hierarchical LiFePO 4 /C cathode material was fabricated by a facile sol spray drying method using FePO 4 •2H 2 O, LiOH, oxalate acid (H 2 C 2 O 4 •2H 2 O) and sucrose as raw materials. A relatively low drying temperature 180 °C was adopted in order to form a uniform and thin carbon layer on the surface. The LiFePO 4 /C sample was characterized by physical and electrochemical measurements and the influence of the specific morphology on the electrochemical property was investigated. This cathode material had a reversible capacity of 160.9 mAh g −1 at 0.1 C and maintained 105.8 mAh g −1 at as high as 20 C with superior cycling performance. The excellent electrochemical property should be attributed to the carbon coated nanoparticles and a large specific surface area (36.5 m 2 g −1 ) provived by the spherical hierarchical structure.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）