CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Xu Su,Han Fang,Hao Yang,Fangfang Zou,Gang Li,Lian Wang,Hongxin Liao,Wei Guan,Xuebu Hu
Polysaccharides can be potential binders for lithium-ion batteries due to their strong adhesion through numerous hydroxyl groups . As a novel waterborne lithiated polysaccharide derivative, cellulose sulfate lithium (CSL) is successfully synthesized and used as the binder for LiFePO 4 (LFP) cathode. The chemical structure of CSL is verified by FTIR-ATR, XRD, C 13 -NMR, GPC , EA , ICP and TGA . Compared to LFP cathode using polyvinylidene difluoride binder, electrochemical measurements show that the LFP cathode using CSL (LFP-CSL) has lower polarization and better rate performance owing to higher lithium-ion conductivity of CSL. The result of morphological analysis indicates that CSL binder can maintain an integrated LFP cathode structure during hundreds of cycles. As a result, the LFP-CSL cathode exhibits a discharge capacity of 133.4 mAh g −1 and maintains remarkable cycle stability with retention of 93.1 % after 300 cycles at 1C. These findings provide novel insights into the rational design of the binders for the LFP cathode.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Bin Xu,Peng Dong,Jianguo Duan,Ding Wang,Xuesong Huang,Yingjie Zhang
The wide usage of LiFePO 4 batteries makes their recovery and recycling urgent. Here, a novel, efficient and environmentally friendly recycling process has been developed to recover high performance LiFePO 4 nano composites from spent LiFePO 4 materials. The process comprises an intensive mechanochemical activation through mixing with precursor mixture and one-step solid state heat treatment. Spent LiFePO 4 , V 2 O 5 , Li 2 CO 3 , and NH 4 H 2 PO 4 are mixed according to the molar ratio of 1-xLiFePO 4 @xLi 3 V 2 (PO 4 ) 3 (x = 0, 0.005, 0.01, 0.03 and 0.1). In the typical process, the decomposition of self-contained binder and the conductive carbon provide a reducing environment as well as an in-situ coating carbon source. The SEM, XRD and XPS results illustrate that V 5+ is doped in the Fe 2+ site when x < 0.01, with co-existence of V 5+ doping and Li 3 V 2 (PO 4 ) 3 when x ≥ 0.03. Sole V 5+ doping assisted in-situ carbon coating displays the best electrochemical performance. The optimized sample shows discharge capacities of 154.3 mA h g −1 and 142.6 mA h g −1 at 0.1 and 1 C rates, respectively, with a high capacity retention of nearly ∼100% after 100 cycles. All results indicate that intensive mechanochemical activation assisted V 5+ doping is a promising strategy for spent LiFePO 4 recycling.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jiachun Xiong,Zhongwei Zhao,Dongfu Liu,Lihua He
In this study, a novel high-efficient approach of directly extracting lithium from the Da Qaidam artificial raw brine (the main components: Li + 0.10 g·L -1 , Na + 82.34 g·L -1 ) by LiFePO 4 /FePO 4 material through the chemical redox method was proposed. The extraction process demonstrated a fast reaction speed and expected lithium adsorption capacity which reached 9.13 mg·g −1 , and the whole process could be online monitored by measuring the solution’s redox potential and pH value. Besides, the adsorption process exhibited excellent ion selectivity while the separation coefficient of lithium towards sodium , potassium , and magnesium reached 8704, 2460, and 6864 respectively. This extraction method features high efficiency, facile and continuous operation, and provides an alternative pathway to directly extract lithium from raw brines.
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DOI
高影响因子
Energy Technology
·
2021
·Vol. 10
·期 3
·2100841
·
IF 3.631
Xinyue Wang,Chi Chen,Shaoping Wu,Hongpeng Zheng,Yujie Chen,Hezhou Liu,Yongming Wu,Huanan Duan
LiFePO 4 is considered a promising cathode material for lithium-ion batteries for its high theoretical specific capacity and cycling stability. However, low electrical conductivity and Li-ion diffusion coefficient limit its electrochemical performances. Herein, gold nanorods (Au NRs) with a length of about 40 nm (aspect ratio of 7:1) are successfully prepared by a seed-mediated growth method. LiFePO 4 composite cathodes with 0.1/0.5/1 wt% Au NRs are compared with a pristine LiFePO 4 cathode, which shows that the addition of Au NRs can improve the electron and lithium-ion transport. Specifically, the addition of 1 wt% Au NRs increases the electrical conductivity and lithium-ion diffusion coefficient to 1.99 S cm −1 and 1.32 × 10 −14 cm 2 s −1 , respectively. The distribution of relaxation times analysis is carried out for the electrochemical impedance spectrum data to distinguish different electrochemical reactions within corresponding frequency regions. Particularly, LiFePO 4 with 0.1 wt% Au NRs exhibits a superior rate capability (133.7 mAh g −1 at 2C and 91.9 mAh g −1 at 5C) and stable cycling performance.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Lifan Wang,Peng Han,Lin Zhang,Xindong Wang,Chun Zhan,Guicheng Liu
The limited cycle life of LiFePO 4 (LFP) batteries, caused by irreversible lithium loss, necessitates innovative pre-lithiation strategies. Commercial lithium oxalate (Li 2 C 2 O 4 , CLCO) offers high lithium compensation capacity (3000 mAh/g) but faces a practical decomposition potential mismatch, exceeding LFP's operational limit (4.2 V). Here, the persistent challenge of high-voltage decomposition of cathode pre-lithiation additives (>4.8 V vs. Li/Li + ) is addressed through a micro-galvanic coupling strategy between CLCO and FePO 4 in the delithiated LFP cathodes. By engineering particle size matching and enhancing interfacial charge transport via cathode calendaring, we amplify the inherent but underutilized CLCO│FePO 4 micro-galvanic effect. This system achieves voltage-synchronized pre-lithiation at 3.5 V during initial charging, where FePO 4 oxidizes Li 2 C 2 O 4 to release 28.11 mAh·g −1 lithium ions while regenerating LiFePO 4 through electron transfer—effectively circumventing high-voltage electrolyte decomposition. Meanwhile, CO 2 byproducts stabilize the solid electrolyte interphase, while decomposition-induced nanopores enhance electrolyte infiltration, boosting rate capability by 40 % at 2C. Impressively, the CLCO pre-lithiated LFP-graphite full cell delivers 154.73 mAh·g −1 initial capacity (22.2 % enhancement vs. control group) with 70.01 % retention after 800 cycles, outperforming conventional configuration (40.26 % after 400 cycles). This voltage-compatible, catalyst-free strategy establishes a scalable pathway for lithium compensation in practical batteries.
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DOI
高影响因子
JOURNAL OF ANALYTICAL CHEMISTRY
·
2021
·Vol. 76
·期 10
·1225-1231
·
IF 1.069
Hao Rusi,Sun Wenliang
Abstract Lithium iron phosphate materials as one of the most representative cathode materials for lithium-ion battery were found to possess intrinsic peroxidase-like activity. LiFePO 4 particles were synthesized by a classic hydrothermal process. In this paper, colorless 3,3',5,5'-tetramethylbenzidine is oxidized to a blue product using hydrothermally synthesized LiFePO 4 particles ( LFP ) as a catalyst with a significant absorption peak at 650 nm. Kinetic assay showed that the catalytic performance was consistent with typical Michaelis–Menten kinetics. As a novel peroxidase mimic material, LFP show the advantages of high catalytic efficiency and favorable stability in aqueous solution compared with natural enzymes, thus providing a simple, inexpensive and fast approach to colorimetric detection of H 2 O 2 and glucose.
研究领域:
材料科学
·
生物化学
·
分析化学
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2017
·Vol. 32
·期 6
·1168-1176
·
IF 1.673
Feifei Xu,Ruiqiong Wang,Ronglan Zhang,Jianshe Zhao
Two series of lithium iron phosphate (LiFePO4) nanocomposites are prepared by a solvothermal method coupled with high temperature calcination using mononuclear and binuclear metal hexaaminophthalocyanines as modulatory additives, respectively. Physical and electrochemical performances of the composites as cathode materials of lithium-ion batteries are characterized by inductively coupled plasma (ICP), X-ray diffraction (XRD), infrared (IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical techniques. The results indicate that the as-synthesized samples modified with binuclear metal phthalocyanines can improve electrochemical properties of LiFePO4 (LFP) for lithium-ion batteries. The composite using binuclear manganese hexaaminophthalocyanine as additive can achieve the highest initial specific discharge capacity of 152.3 mAh/g at 0.1 C, higher than that of ones modified with the corresponding mononuclear phthalocyanine 143.0 mAh/g. Furthermore, the most excellent product exhibits a pretty good capacity retention of 93.0% after 50 cycles at 0.1 C, cycling stability, and low charge transfer resistance of 58.7 Ω.
研究领域:
材料科学
·
电化学
·
纳米复合材料
·
能源存储
·
无机化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 8
·11332-11339
·
IF 4.527
Gui-Yang Luo,Yi-Jing Gu,Yuan Liu,Zi-Liang Chen,Yong-lin Huo,Fu-Zhong Wu,Yi Mai,Xin-Yi Dai,Yong Deng
LiFePO 4 modified by N-doped graphene (NG) with a three-dimensional conductive network structure was synthesized via a one-step in situ hydrothermal method . The effects of N amount of NG on the phase structure, morphology, and electrochemical properties of LiFePO 4 are investigated in this study. X-ray diffraction (XRD) results show that doping suitable N amounts in NG do not alter the crystal structure of LiFePO 4, and scanning electron microscopy (SEM) images show that NG can slightly reduce the particle size of LiFePO 4 . The high-resolution transmission electron microscopy (HRTEM) results show that the LiFePO 4 particles are well covered and connected by NG. The electrochemical performance confirms that LiFePO 4 modified by 20% N-doped graphene (named LFP/NG-4) displays a perfect specific capacity of 166.6 mAh·g −1 at a rate of 0.2C and can reach 125 mAh·g −1 at a rate of 5 C. Electrochemical impedance spectroscopy (EIS) results illustrate that the charge transfer resistance value of the LFP/NG-4 composite is only 58.6 Ω, which is very low compared with LiFePO 4 . Cyclic voltammetry (CV) tests indicate that the addition of 20% N-doped graphene can effectively reduce electrode polarization and improve reversibility. The LFP/NG-4 composite with a three-dimensional conductive network structure can be regarded as a promising cathode material for Li-ion batteries.
研究领域:
材料科学
·
电化学
·
储能
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DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2014
·Vol. 30
·期 1
·88-94
·
IF 0.886
SU Chang,HUANG Qi-Fei,XU Li-Huan,ZHANG Cheng
An olivine LiFePO4/carbon (C-LiFePO4) nanocrystallinematerial was prepared using a low-temperature solvothermalmethod, followed by a high-temperature post-annealing process. Then polytriphenylamine (PTPAn)-modified C-LiFePO4 (C-LiFePO4/PTPAn)
was prepared, as a composite for novel cathodes for lithium-ion batteries, by solution blending of the C-LiFePO4 nanocrystallinematerial and the electroactive conducting polymer PTPAn. The effects of PTPAn coating of the C-LiFePO4/PTPAn samples were investigated using
X-ray diffraction (XRD), scanning electronmicroscopy (SEM), transmission electronmicroscopy (TEM), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge testing. The results indicated that the solution blending method produced a compact PTPAn coating on the C-LiFePO4,
providing an effective electronic/ionic conducting pathway and enhancing the electrochemical activities of C-LiFePO4-based composites. The C-LiFePO4/10%(w) PTPAn electrode displayed an improved initial discharge capacity of 154.5mAh·g-1 at 0.1C,
a superior high-rate performance discharge capacity of 114.2 mAh·g-1 at 10C, and excellent cycling stability.With further increases in the PTPAn content of the coating on the C-LiFePO4/PTPAn composite, the electrochemical properties of the composite decreased.
Electrochemical impedance measurements also demonstrated that the PTPAn coating significantly decreased the charge-transfer resistance of the C-LiFePO4 electrode.
研究领域:
材料科学
·
电化学
·
储能
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DOI
高影响因子
Chemistry-An Asian Journal
·
2024
·Vol. 19
·期 14
·e202400181
·
IF 3.5
Xingguang Lu,Yuanyuan Ren,Daming Chen,Xiaolong Guo,De Li,Yong Chen
In Li-ion batteries, the origin of memory effect in Al-doped Li 4 Ti 5 O 12 has been revealed as the reversible Al-ion switching between 8a and 16c sites in the spinel structure, but it is still not clear about that for olivine LiFePO 4 , which is one of the most important cathode materials. In this work, a series of Na-doped and Ti-doped LiFePO 4 are prepared in a high-temperature solid-state method, electrochemically investigated in Li-ion batteries and characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Magic-Angle-Spinning Nuclear Magnetic Resonance (MAS NMR). Compared with non-doped LiFePO 4 , the Ti doping can simultaneously suppress the memory effect and the Li−Fe anti-site, while they are simultaneously enhanced by the Na doping. Meanwhile, the Ti doping improves the electrochemical performance of LiFePO 4 , opposite to the Na doping. Accordingly, a schematic diagram of phase transition is proposed to interpret the memory effect of LiFePO 4 , in which the memory effect is attributed to the defect of Li−Fe anti-site.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
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DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Yarui Dong,Jian Xu,Ping Du,Zhongjun Feng,Baicun Zheng
A series of comb polymers poly(2-(dimethylamino)ethyl methacrylate (DMAEMA)-co-methacrylic acid (MAA)-co-methoxy polyethylene glycol methacrylate (MPEGMA)) (poly(DMAEMA-MAA-MPEGMA, DMM) were synthesized and used as N-methyl-2-pyrolidinone (NMP)-based lithium iron phosphate (LFP) suspension dispersants. The effects of the grafting density of the carboxyl group as the anchoring group and the chain length of the side chain of PEG, which plays the role of spatial site resistance, on the rheological properties and suspension stability of the slurry were systematically investigated. By investigating the adsorption amount and thickness of DMM on the LFP surface, combined with calculations based on the scalar law and Flory theory, the molecular structure of the comb polymer dispersant was revealed to influence the adsorption and dispersion performance. The dispersion of LiFePO4 was due to the synergistic effects of adsorption and steric hindrance effect, which resulted that dispersants with medium carboxyl density and PEG side chain length can improve the dispersion performance and stability.
研究领域:
材料科学
·
高分子化学
·
电化学
·
胶体与界面科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yi Fan,Jirui Song,Yongyou Su,Yun Luo,Le Tian,Qingfeng Liu,Zitong Fei,Chenchen Li,Qi Meng,Peng Dong,Yingjie Zhang
The widespread utilization of LiFePO 4 (LFP) batteries has rendered the green regeneration of spent LFP cathode materials (SLFP) an urgent priority. Selective lithium extraction strategies have rapidly advanced through enabling simplified yet efficient lithium recycling. However, under acidic conditions, minor Fe dissolution was observed to significantly reduce the structural stability of regenerated LFP materials while exacerbating Li/Fe antisite defects. A novel strategy based on Fe vacancy site-mediated bond energy reinforcement and nucleation regulation was proposed to achieve structural reinforcement and high-efficiency regeneration. Experimental characterization revealed that Li/Fe antisite defects in regenerated materials were reduced from 1.48 % to 0.93 %, with grain size being significantly refined. The regenerated material exhibited a reversible capacity of 150.2 mAh·g −1 at 1C rate, maintaining 94.74 % capacity retention after 500 cycles, while its discharge capacity at 5C rate was elevated by 60 mAh·g −1 . Environmental and economic assessments conducted via the everbatt model demonstrated significant advantages of this strategy.
研究领域:
材料科学
·
电化学
·
储能技术
·
环境科学
·
化学工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）