JOURNAL OF POWER SOURCES
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2026
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IF 8.4
Xueliu Wang,Jin Long,Zixiang Guo,Yi Xing,Wenge Jiang
The quality of iron(III) phosphate (FePO 4 , FP), a critical precursor for lithium iron phosphate (LiFePO 4 , LFP) cathodes, is paramount to the electrochemical performance of LFP. However, conventional industrial FP often suffers from irregular morphology, broad size distribution, and severe agglomeration, which limit LFP performance. To address this issue, we developed a temperature-mediated liquid-phase precipitation method for the controllable synthesis of FP precursors and systematically investigated how the precipitation temperature influences the properties of the precursors and, in turn, determines the electrochemical performance of the resulting LFP material. The optimized FP obtained at 80 °C exhibits uniform spherical particles, a narrow size distribution, excellent dispersibility, a near-theoretical Fe/P ratio, and high purity. Consequently, the derived LFP cathode demonstrates enhanced crystallinity, reduced particle size, and improved dispersion, leading to superior electrochemical properties. It delivers an initial discharge capacity of 161.63 mAh·g −1 at 0.1C and maintains 141.48 mAh·g −1 after 100 cycles at 1C, corresponding to a 97.20% capacity retention. The material also showcases outstanding rate performance, high reversibility, and low charge-transfer resistance. This work provides a robust and scalable strategy for producing high-quality FP precursor and high-performance LFP cathodes, contributing to the advancement of lithium-ion battery technology.
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高影响因子
Journal of Materials Chemistry A
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2026
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IF 9.2
Qiyue Wang,Changkun Gao,Xinyuan Zhang,Feiyang Zhan,Haimin Zhang,Huijun Zhao
High-efficiency lithium extraction from spent LiFePO4, while maintaining intact FePO4 crystalline structure and composition, is important for the sustainable recycling of spent LiFePO4 batteries. Here, we report an innovative electrochemical-assisted approach that employs a Ti4O7 electrode as the anode to activate peroxydisulfate (PDS), enabling efficient extraction of lithium from spent LiFePO4 dispersed in the electrolyte. The results indicate that when the electrolysis is performed under a voltage of 3.8 V, the leaching efficiency of lithium from LiFePO4 reaches ∼99.8% within 20 min, and the amount of PDS used is only 0.85 times the theoretical value, simultaneously maintaining good crystalline structure and composition of FePO4 with negligible dissolution of Fe and P elements. This superior performance can be attributed to the electrochemical assistance approach, which can stabilize the solution pH within the range of 2–6, suitable for Li+ extraction and the stability of FePO4. More importantly, electroactivation and the Fenton-like effect of Fe2+ activate PDS to generate active free radicals (SO4˙− and ˙OH) for oxidation, direct electrolyte (PDS) oxidation, and electrochemical oxidation on the Ti4O7 electrode, forming a triple oxidation synergy to facilitate the transformation of Fe2+ to Fe3+ in LiFePO4, thus efficiently releasing Li+ and forming FePO4. The above has been confirmed by means of a series of comparative experiments and spectroscopic measurement results. Both thermodynamic and kinetic studies have shown that this synergistic oxidation strategy is highly efficient, which will be helpful for the scalable and eco-friendly recycling of spent LiFePO4 batteries.
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高影响因子
Journal of Energy Storage
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2026
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IF 10.7
Long Zhao,Ke Wang,Wenbo Wang,Xuelin Chen,Xu Zhang,Bingjun Yang,Peiyu Wang,Juan Yang,Wanjun Chen,Bao Yang,Pengjun Ma
Direct regeneration of spent LiFePO 4 (SLFP) cathode materials is crucial for the sustainable development of new energy vehicles and other energy storage sectors. However, challenges persist in conventional regeneration technology, including severe secondary pollution, low economic efficiency, and a complex regeneration process. Herein, a direct regeneration strategy for SLFP is proposed through a water bath approach, wherein the synergistic interplay between Glycine as the reducing agent and Li 2 CO 3 as the lithium source profoundly influences the regeneration of the SLFP. The direct regeneration mechanism reveal that the synergistic interaction of the reducing agent and the lithium source contribute to facilitating re-lithiation and lattice restoration, wherein Glycine as an electron donor to create a reductive environment to transform Fe(III) into Fe(II) and Li 2 CO 3 as the lithium source is synchronously reintroducing to repair the Fe Li anti-site defects in the lattice, thereby achieving the regeneration LFP (RLFP). Moreover, the nitrogen that derives from the amino groups in Glycine is doped into the carbon layer of the RLFP, offering more active sites to enhance Li + migration kinetics, thereby endowing the RLFP with excellent rate capability. The RLFP demonstrates excellent electrochemical performance with an initial discharge capacity of 155.7 mAh g −1 at 0.1C and capacity retention of 92% after 200 cycles at 0.5C. This strategy inspires novel insights into the in situ direct regeneration of the SLFP cathode materials.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jinxuan Chen,Yiming Zhang,Tuan Wang,Enhao Xu,Weigang Wang,Zishuo Zhang,Yun Zhang,Kaipeng Wu
Selective leaching recovery for spent LiFePO 4 (LFP) has garnered significant attention owing to its advantages of low-cost, high-efficiency and eco-friendliness. Wherein, the separation effect of Li and Fe is particularly crucial. While previous studies have yielded effective Li-Fe separations experimentally, the migration behavior of Fe during the selective leaching process remains unexplored methodically. Herein, this work systematically investigated the selective leaching characteristics and regeneration behavior of spent LFP in the H 2 O 2 -H 2 SO 4 system. Particularly, for the first time, a migration mechanism of Fe involving precipitation-dissolution and hydrolysis equilibria has been proposed. Specifically, the proportion of Fe that forms precipitate or exists in the filtrate is dependent on the real-time pH value. The result indicates that at an optimized pH of 3, an effective separation of Li (>98 %) and Fe (<0.1 %) is achieved. Additionally, FePO 4 ·2H 2 O was recovered from the residue through a recirculated process and employed to resynthesize LFP/C, which exhibits excellent specific discharge capacity of 158 mAh·g −1 at 0.1 C and maintains a capacity retention ratio of 99 % after 300 cycles at 2 C. The proposed mechanism is expected to guide highly selective extraction of Li, and the recovery process avoids excessive reagent consumption and secondary pollutions in principle.
研究领域:
材料科学
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环境科学
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化学工程
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高影响因子
APPLIED SURFACE SCIENCE
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2018
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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
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能源存储与转换
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Cai Qi,Shuhan Wang,Xukun Zhu,Tong Zhang,Yanju Gou,Zexin Xie,Yachao Jin,Yao Wang,Li Song,Mingdao Zhang
The green and low-cost recycling of spent LiFePO 4 (LFP) cathode materials has become an urgent problem to be solved. In this work, a completely green and easy scale-up recycling process is developed to recycle the cathode powders from spent LFP batteries. The optimal regeneration conditions are obtained by adjusting temperature, Li + concentration and reductant dosage. Meanwhile, the mechanism of regeneration is investigated by microscopic characterization and electrochemical performance testing. The regenerated LFP shows a good discharge specific capacity of 148 mAh/g at 0.05 C, which exhibits around 96% the capacity of raw LFP. Additionally, the costs of the consumption only account for 19.8% the price of raw LFP, which indicates that this method has good prospect of economic returns. This regeneration method is low in cost, simple in process, mild in conditions and easy to scale up, providing technical supports for the sustainable development of lithium-ion battery industry.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Dezhi Wang,Jiasen Wang,Xuebao Li,Cheng Han,Hao Fei,Zhuangzhi Wu
In the pursuit of enhancing the energy density of lithium-ion batteries, cathode prelithiation emerges as a pivotal approach, introducing additional irreversible active lithium ions to augment performance. Li 5 FeO 4 (LFO) stands out as an excellent option, boasting an impressive theoretical specific capacity and the additional advantages of cost-effectiveness in raw materials and low preparation cost. However, the impact of extra lithium incorporations on compositional changes at the electrode-electrolyte interface as well as on cell stability has impeded further researches. Herein, a Mn doping strategy is proposed and predicted by first-principles calculations to synthesize partially Mn-substituted Li 5.125 Fe 0.875 Mn 0.125 O 4 (LFMO). And the prelithiation with LFMO improved the interfacial composition of LiFePO 4 (LFP) batteries compared to LFO, achieving a charging capacity of 213 mAh∙g −1 in the first cycle at 0.05 C. The subsequent treatment demonstrated superior cycling stability, maintaining a discharge specific capacity as high as 155.3 mAh∙g −1 after 100 cycles at 0.2 C, and exhibiting a higher capacity retention in the full cell. These discoveries could contribute to enhancing the regulation of battery interface during the utilization of LFO, potentially promoting the development of cathode lithium additives.
研究领域:
材料科学
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电化学
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电池技术
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 44
·期 3
·791-796
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IF 3.069
Yi Di,Suping Jia,Xiaoshuang Yan,Junfei Liang,Shengliang Hu
The development of self-chargeable lithium-ion batteries is of great significance for expanding the usable range of the lithium-ion battery and it has received intensive attention from numerous researchers. Solar cells can generate electricity from the sunlight and ensure sustainable access to electrical power for charging lithium-ion batteries. Herein, a photo-charging integrated device is constructed by combining four conventional dye-sensitized solar cells and a three-electrode hybrid lithium-ion battery, including a dye-sensitized TiO2 photo-anode, LiFePO4 electrode and metal lithium electrode. When the device is operated under solar illumination, DSSCs can match the charging voltage for the hybrid lithium-ion battery. The LiFePO4 electrode in the three-electrode device plays two roles, serving as a reversible redox agent for the regeneration of dye and as the cathode for lithium-ion batteries. The integrated device can effectively harvest solar energy and store it in situ within the hybrid lithium-ion battery through the photo-charging process. The proposed strategy is in favor of exploiting the small-sized, light-weight, self-chargeable battery and may have the potential to be employed as the power supply for miniaturized sensors and mobile devices.
研究领域:
材料科学
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能源技术
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电化学
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高影响因子
FERROELECTRICS
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2018
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IF 0.728
Zhiyang Yuan,Yanfen Xue,Lingna Sun,Yongliang Li,Hongwei Mi,Libo Deng,Weiliang Hong,Xiangzhong Ren,Peixin Zhang
LiFePO4/reduced graphene oxide composites (LiFePO4/RGO) were synthesized via a simple solid phase combined with carbothermal reduction method. The samples were characterized by X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM). Furthermore, cyclic voltammetry (CV), electrochemicaal impendence spectroscopy (EIS) and galvanostatic charge/discharge tests were conducted to further study the electrochemical properties of LiFePO4/RGO composites. The initial discharge specific capacity of LiFePO4/RGO was 151.5 mAh g−1 at 0.1C, and after 50 cycles, it still remains 149.2 mAh g−1. The results reveal that LiFePO4/RGO composites improved the discharge specific capacity and rate charge-discharge performance.
研究领域:
材料科学
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电化学
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高影响因子
Journal of Energy Chemistry
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2026
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IF 15.6
Yuelin Kong,Shuaipeng Hao,Yaqi Liao,Yudi Shao,Le Hu,Wei Liu,Yuanguang Xia,Wen Yin,Jingwei Xiang,Yunhui Huang,Lixia Yuan
The LiFePO 4 batteries are expected to face a significant wave of retirement in the coming years. This necessitates the establishment of a comprehensive and environmentally friendly recycling system for spent LiFePO 4 batteries. The traditional hydrometallurgical and pyrometallurgical methods involve high costs and serious pollution. This work provides a more efficient and environmentally benign alternative by repairing spent LiFePO 4 through a citric acid-LiCl deep eutectic solvent (DES). The citric acid and LiCl form a molten state through hydrogen bonding at lower temperatures, enabling the ambient-pressure repair. The LiCl acts as a Li source to replace the lost Li. The citric acid donates electrons to reduce Fe 3+ to Fe 2+ , reducing electrostatic repulsion to facilitate Fe to return to its original lattice site, thereby eliminating Fe-Li anti-site defects and promoting the insertion of Li + into the lattice. Remarkably, this method eliminates the strict requirement for Li/Fe molar ratio control, making it applicable to spent LiFePO 4 batteries with varying degradation levels. The regenerated LiFePO 4 shows great electrochemical performance with a discharge capacity of 158.3 mA h g −1 at 0.5 C, with a capacity retention of 82.8% after 600 cycles. Notably, the DES demonstrates recyclability and stable regeneration efficiency, while its eco-friendly nature further enhances the economic viability and industrial potential of this process.
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高影响因子
International Journal of Electrochemical Science
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2023
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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.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Xiaohui Tian,Zhonghua Chen,Yanbin Zhu,Xiao Huang,Guan Wu,Yingke Zhou
The three-dimensional (3D) graphene aerogel (GA)-wrapped LiFePO 4 submicron-rod composite (LFP@GA) has been prepared successfully through a solvothermal method followed with rapid freeze-drying. Monodispersed LiFePO 4 submicron-rods are well-enwrapped with the graphene sheets and which further form a highly porous and conductive 3D structure, leading to the overall rapid electron transport of the composite electrode and affording many interwoven pores for fast supply of Li + and storage of electrolyte. Moreover, the combination of the rod-shaped LFP and porous 3D structure can effectively relieve the stress resulted from the structural change during the insertion/deinsertion of Li + . Owing to these particular structure and characteristics, the LFP@GA composite presents a high discharge capacity (162.7 mAh g −1 at 0.1 C), a remarkable rate capacity (119.9 mAh g −1 at 5 C) and an excellent long-term cycle stability after 1000 cycles at 1 C (86.5% capacity retention), which is potential for use in Li-ion batteries.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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锂离子电池
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DOI
高影响因子
危险品化学品经营许可证（带存储）