Journal of Energy Chemistry
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2026
·
IF 15.6
Wenjing Chen,Rong Li,Fangxiang Song,Xiaozhi Chen,Qianlin Chen
Olivine-structured LiFe (1− x ) Mn x PO 4 (LFMP) cathode materials are promising because they combine the excellent rate capability of LiFePO 4 with the high operating voltage of LiMnPO 4 . However, lattice distortion induced by the Jahn–Teller effect in Mn 3+ considerably impedes lithium-ion transport, limiting the full performance of cathode materials. To address this issue, this study proposes a defect engineering strategy based on lattice mismatch regulation, enabling the controlled design of dislocation defect types through precise adjustment of the Fe/Mn ratio. A comprehensive investigation of the underlying mechanisms reveals that an optimal Fe/Mn ratio generates specific local dislocation morphologies by controlling the degree of lattice mismatch. This effectively transforms Jahn–Teller induced lattice defects into channels that facilitate rapid lithium-ion transport, thereby improving electrochemical performance. Accordingly, LiFe 1− x Mn x PO 4 ( x = 0.3, 0.4, and 0.5) cathode materials are synthesised using a solid-state method. The best electrochemical performance is achieved at a Fe:Mn ratio of 6:4, delivering an initial discharge capacity of 178.3 mA h g −1 , a Coulombic efficiency of 94.3%, and a capacity retention rate of 96.5% after 1000 cycles at 1 C. This finding provides a new approach for developing high-performance electrode materials for lithium-ion batteries through defect engineering design strategies.
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高影响因子
Research
·
2026
·
IF 12.9
Jian Zhi,Yunfeng Luo,Chenyi Liao,Zhongyi Liu,Mei Han,Kaihang Yue,Lei Zhang,Guohui Li,P Chen
Present high-voltage Li-ion aqueous batteries largely rely on highly concentrated (up to 63 m ) “water-in-salt” electrolyte with limited cycle life (<1,000 cycles) and little hope in practical application. To date, no dilute aqueous electrolyte (salt molality < 2 m ) can reliably operate beyond 2 V with cycling life over 1,000 cycles. Here, we introduce a “methanesulfonate in phosphate” superstructure that simultaneously tailors Li + migration in molecular crowding solvent and electrode surfaces, which enables an unprecedented electrochemical stability window (up to 4.5 V) and cyclability (up to 10,000 cycles) in a dilute 1.1- m aqueous electrolyte. In addition, Such methanesulfonate in phosphate electrolyte can be also applied in various high-voltage electrode couples, and the assembled 60-V, 15-A·h LiMn 2 O 4 /LiTi 2 (PO 4 ) 3 aqueous battery can drive an electric bike for 70 km, highlighting the power of such electrolyte design in the commercialization of high-voltage aqueous batteries.
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PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Kai Xia,Rui Liang,Yi Luo,Anqiao Zheng,Guodong Jiang,Mingxia Fan,Jian Xiong,Songdong Yuan
A series of LiFe 0.7 Mn 0.3−x Mg x PO 4 /C (x = 0, 0.02, 0.05, and 0.08) cathode materials were synthesized by a high-temperature solid-phase method and characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and electrochemical tests to determine the structural, morphological, and electrochemical properties of the synthesized materials. The experimental results showed that the small amount of Mg 2+ doping not only had no effect on the crystalline structure of the material but also significantly improved the electrochemical properties of the material. The LiFe 0.7 Mn 0.25 Mg 0.05 PO 4 /C material achieved specific discharge capacities of 163.2, 155.2, 149.1, and 142.0 mAh/g at 0.1C, 0.2C, 0.5C, and 1C, respectively, and a capacity retention rate of 98.6% after 50 cycles at 0.1C. It exhibited excellent rate performances and cycling stability. Electrochemical alternating-current impedance showed that the lithium-ion diffusion coefficient of the LiFe 0.7 Mn 0.25 Mg 0.05 PO 4 /C sample reached 1.19 × 10 −13 cm 2 /s, which was 4.1 times higher than that of the pre-modified sample. Combined with the cyclic voltammetry test results, it was found that the appropriate amount of Mg 2+ doping could reduce the impedance and polarization of the material as well as increase the conductivity and the lithium-ion diffusion rate, ultimately improving the electrochemical properties.
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高影响因子
Materials
·
2021
·Vol. 14
·期 12
·3193
·
IF 3.623
Tu Lan,Xiaolong Guo,De Li,Yong Chen
The memory effect of lithium-ion batteries (LIBs) was first discovered in LiFePO4, but its origin and dependence are still not clear, which is essential for regulating the memory effect. In this paper, a home-made spray drying device was used to successfully synthesize LiFePO4with an average particle size of about 1 μm, and we studied the influence of spray drying temperature on the memory effect of LiFePO4in LIBs. The results showed that the increasing of spray drying temperature made the memory effect of LiFePO4strengthen from 1.3 mV to 2.9 mV, while the capacity decreased by approximately 6%. The XRD refinement and FTIR spectra indicate that the enhancement of memory effect can be attributed to the increment of Li–Fe dislocations. This work reveals the dependence of memory effect of LiFePO4on spray drying temperature, which will guide us to optimize the preparation process of electrode materials and improve the management system of LIBs.Keywords:LiFePO4;spray drying method;memory effect;cathode materials
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Guodong Du,Yakun Xi,Xiaohui Tian,Yanbin Zhu,Yingke Zhou,Chengji Deng,Hongxi Zhu,Angulakshmi Natarajan
Three-dimensional (3D) porous LiFePO 4 /graphene aerogel (LFP/GA) composite was successfully prepared by an in-situ hydrothermal process. In this composite, the LiFePO 4 microspheres assembled by nanoparticles were embedded in a three-dimensional framework intertwined with the graphene sheets, which acts as a bridge for transfer of electron and diffusion of lithium ion . The large specific surface of the composite structure enables the increased infiltration area and utilization of the active material. The content of the graphene sheet is analyzed and is found important for the Li-storage characteristics of LiFePO 4 . An aerogel composite with 10% of graphene displays the best electrochemical performance, with the specific discharge capacities of 168 mAh g −1 and 155 mAh g −1 at respectively 0.1C and 1C, and the capacity retains 96.3% for up to 800 cycles. This novel 3D porous aerogel composite is identified as a promising cathode material for the rechargeable Li battery, and the simple strategy may be applied to construct other high performing composite structure and materials.
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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.
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高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 3
·996-1004
·
IF 0
Xue Zhou,Ye Xie,Yuanfu Deng,Xusong Qin,Guohua Chen
The rate performance of LiMnPO4-based materials is further improved via synergistic strategies including a surfactant-assisted solid state method, Fe-substitution and carbon-coating. The surfactant-assisted solid state strategy effectively decreases the primary particle size of the cathode material, which can greatly shorten the diffusion distance of lithium ions. The Fe-substitution improves the effectiveness of Li+ insertion/extraction reactions in the solid phase. The uniform carbon coating layer and the conductive networks provided by the carbon between the nanoparticles ensure the continuous conductivity by the nanoparticles. As a consequence of the synergistic effects, the as prepared LiFe0.5Mn0.5PO4 sample with 6.10 wt% carbon exhibits high specific capacities and superior rate performance with discharge capacities of 155.0, 140.9 and 121 mA h g−1 at 0.1, 1 and 5 C (1 C = 170 mA g−1), respectively. Meanwhile, it shows stable cycling stability at both room temperature (25 °C, 94.8% and 90.8% capacity retention after 500 cycles at 1 and 5 C rates, respectively) and elevated temperature (55 °C, 89.2% capacity retention after 300 cycles at 5 C rate). This material may have great potential application in advanced Li-ion batteries.
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JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Jugong Zheng,Liang Ni,Yanwen Lu,Cancan Qin,Panxing Liu,Tongfu Wu,Yuefeng Tang,Yanfeng Chen
LiMnPO 4 is proposed as more promising cathode material as LiFePO 4 , while poor electronic conductivity and Jahn-Teller effects during charge/discharge processes hinder the electrochemical performance. To overcome these problems, one-step solid state reaction method is developed to synthesize LiMnPO 4 /C composites, which is with nanostructure , high crystallinity and good carbon coating. Manganese oxide sources and calcination temperature are investigated as factors for preparing high-performance LiMnPO 4 /C for Li-ion batteries. The results show that the LiMnPO 4 /C composites prepared with mixed manganese oxide deliver a superior initial capacity of 153 mAh g −1 at 0.05 C and high rate performance with discharge capacities of 123 mAh g −1 at 1 C and 103 mAh g −1 at 2 C. And the LiMnPO 4 /C composites synthesized at 600 °C can retain 94% of the initial capacity after 200 cycles at 1 C, revealing a stable cycling stability. Therefore, one-step solid state reaction brings to light the synthesis of high performance LiMnPO 4 /C cathode materials and is suitable for large scale production.
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高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 29
·15299-15306
·
IF 7.443
Jugong Zheng,Cancan Qin,Tongfu Wu,Shuangfei Xie,Liang Ni,Muyang Peng,Yuefeng Tang,Yanfeng Chen
Preparing high-performance LiMnPO4 is still a large obstacle due to its sluggish electrochemical kinetics. To overcome this problem, a novel method is developed for LiMnPO4/C nanoplates from nanoporous Mn2O3 precursors. There are two advantages. Firstly, through negative pressure immersion, lithium dihydrogen phosphate (LiH2PO4), lithium hydroxide (LiOH) and sucrose (C12H22O11) are deposited on the surface of porous Mn2O3 nanosheets. In the following solid-state reaction, three dimensional continuous conductive carbon is wrapped uniformly around the LiMnPO4/C nanoplates, which greatly improved the conductivity. Secondly, (010) exposed facets are obtained using the Mn2O3 hierarchical microspheres as precursors, which allows for a fast transmission of Li+ ions improving the rate capability. As a result, the as-synthesized L-Mn2O3-LMP/C samples exhibit a superior rate performance with discharge capacities of 157.3 mA h g−1 at C/20, 122.6 mA h g−1 at 1C, and 105.8 mA h g−1 at 2C. Meanwhile, they can retain 99.3% of the initial capacity after 100 cycles at 1C, revealing an excellent cycling stability. This method sheds more light on the fabrication of high-performance LiMnPO4/C cathode materials and is suitable for large scale productions.
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高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Xiaofeng Tu,Yingke Zhou,Yijie Song
The three-dimensional porous LiFePO 4 modified with uniformly dispersed nitrogen-doped carbon nanotubes has been successfully prepared by a freeze-drying method. The morphology and structure of the porous composites are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), and the electrochemical performances are evaluated using the constant current charge/discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy. The nitrogen-doped carbon nanotubes are uniformly dispersed inside the porous LiFePO 4 to construct a superior three-dimensional conductive network, which remarkably increases the electronic conductivity and accelerates the diffusion of lithium ion. The porous composite displays high specific capacity, good rate capability and excellent cycling stability, rendering it a promising positive electrode material for high-performance lithium-ion batteries.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 32
·27164-27169
·
IF 3.289
Han Xu,Jun Zong,Fei Ding,Zhi-wei Lu,Wei Li,Xing-jiang Liu
To improve the electrochemical performance of LiMnPO4, a modified polyol reaction has been successfully developed for the preparation of LiMnxFe1−xPO4/C samples (x = 0.2, 0.5, 0.8). The secondary particles of the acquired LiMnxFe1−xPO4/C samples are spherical or annular, and the primary particles are nano-sized (20–80 nm). The LiMn0.8Fe0.2PO4/C has a higher energy density of 637 W h kg−1 compared with LiMn0.2Fe0.8PO4/C (575 W h kg−1) and LiMn0.5Fe0.5PO4/C (584 W h kg−1). The TEM image shows that the primary particles of LiMn0.8Fe0.2PO4/C are uniformly covered by a 3 nm carbon layer, and it can deliver a high discharge capacity of 161 mA h g−1 at 0.05C. At a 0.5C discharge rate, the LiMn0.8Fe0.2PO4/C can maintain 80.4% of its initial capacity after 900 cycles, and it also maintains 90% and 83% of its initial capacity at 45 °C and 55 °C respectively after 100 cycles. The results demonstrate that the modified polyol process is feasible for Fe-doping and carbon-coating to enhance the electrochemical performance of LiMnPO4.
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高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Jinping Mu,Xiaohui Li,Rui He,Lijing Sun,Xue Bai,Lihui Zhang,Peng Liu,Zhenfa Liu,Jing Gao,Aijia Wei
High-voltage lithium-ion batteries (LIBs) with LiNi 0.5 Mn 1.5 O 4 (LNMO) cathode are considered promising energy sources due to their high energy density . However, enhancing the stability of the electrode/electrolyte interface remains critical for the practical application of LIBs. In this work, lithium-containing inorganic phosphates (LiPO 3 , Li 3 PO 4 , and LiH 2 PO 4 ) were used as multifunctional inorganic additives to improve the stability of the electrode/electrolyte interface in 5.0 V, LNMO-based LIBs with carbonate-based electrolytes. Based on theoretical calculations and experimental evaluations of the electrochemical performance , LiPO 3 was selected as the optimal additive for further study in LNMO/Li and LNMO/Li 4 Ti 5 O 12 cells. The LNMO/Li half-cells with LiPO 3 delivered an initial discharge capacity of 108.8 mAh∙g −1 and retained a capacity of 94.9 % after 500 cycles at 5C, compared to 75.1 mAh∙g −1 and 79.4 % for the standard electrolyte. The increased cycling stability was ascribed to the ability of the multifunctional, film-forming LiPO 3 additive to form stable interfacial films on both the cathode and anode , thus, inhibiting side reactions between the electrodes and electrolyte. Moreover, as an HF scavenger, LiPO 3 reduced the HF content in the electrolyte to ensure the structural integrity of LNMO and inhibit the dissolution of transition metal ions . In the LNMO/Li 4 Ti 5 O 12 full cells, the addition of LiPO 3 effectively enhanced the cycling performance, and the capacity retention after 400 cycles at 5C was 79.1 %, compared to only 12.3 % for the standard electrolyte. Considering its simplicity, low cost, and feasibility, the addition of LiPO 3 as a multifunctional electrolyte additive showed excellent prospects for commercial applications.
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高影响因子
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