Energy Storage Materials
·
2023
·
IF 20.4
Yingpan Yang,Jialiang Zhang,Hao Zhang,Yuxin Wang,Yongqiang Chen,Chengyan Wang
The widespread use of lithium-ion batteries for energy storage will result in millions of tons of scrapped LiFePO 4 (LFP) batteries. Current recycling technologies for LFP cathode materials require harsh acid treatments and are expensive. Hence, in this work, an ingenious electrochemical method is developed to recycle scrapped LFP. Specifically, through the charging/discharging process of an electrolytic system in which both the cathode and anode are scrapped LFP, the anode is de-lithiated to obtain FePO 4 (FP), meanwhile, the Li + from the anode is embedded into the cathode scrapped LFP to achieve regeneration. The experimental results show that the anode de-lithiation rate is 92 % and the cathode regeneration performance is closely related to the driving voltage . A voltage of 1 V converts the FP phase to LFP and effectively eliminates the LFP defect lattice. However, an excessive voltage (1.2 V) leads to an extremely fragile LFP crystal structure, resulting in the ineffective embedment of Li + into the defective lattice and ineffective capacity restoration. The regenerated LFP exhibits a high restored capacity (136.5 mAh g −1 at 1 C) and excellent stability (95.32 % capacity retention after 300 cycles at 5 C). This novel method does not require an additional Li source, consumes low electrical energy (31.9 kWh t −1 ) and has a high current efficiency (>98 %), and it yields economic and environmental benefits that will contribute to the sustainable development of the LFP industry.
研究领域:
材料科学
·
环境科学
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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
✓ 已验证
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
✓ 已验证
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
✓ 已验证
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
✓ 已验证
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
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 13
·9690-9700
·
IF 2.993
Huang Jinxin,Wang Jinglun,Zhong Haoxiang,Zhang Lingzhi
N -cyanoethyl polyethylenimine (CN-PEI) is synthesized by modifying polyethylenimine (PEI) with acrylonitrile through a Michael addition reaction. Depending on cyanoethylation level, CN-PEI can be obtained as a form of solution, micro-emulsion or emulsion in water. CN-PEI micro-emulsion is investigated as water-soluble binder for the application of lithium iron phosphate (LFP) cathode in lithium-ion batteries. CN-PEI binder not only maintains the outstanding dispersion capability of PEI but also exhibits an excellent adhesion strength and higher ionic conductivity because of the introduction of polar cyano groups. As a result, CN-PEI binder can effectively maintain the mechanical integrity and decrease the polarization of LFP electrode during the operation of the battery. LFP electrode with CN-PEI binder exhibits good cycle stability and enhanced rate performance delivering a capacity of 99.6% at a rate of 0.5 C after 100 cycles and a high discharge capacity of 102.4 mAh g −1 at 5 C.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
DOI
高影响因子
IONICS
·
2017
·Vol. 24
·期 3
·671-679
·
IF 2.062
Yan Yinglin,Li Qiaole,Ren Bing,Yang Rong,Xu Yunhua,Zhong Lisheng,Wu Hong
Hierarchical lithium iron phosphate/carbon (LiFePO 4 /C) microspheres were fabricated successfully using a facile spray drying-assisted coprecipitation method. A relatively short calcination time and a relatively low calcination temperature were adopted to prepare the hierarchical LiFePO 4 /C microspheres. The hierarchical microspheres consisted of nanoparticles with a uniform coating of amorphous carbon. The thickness of the carbon layer was controlled by the addition of glucose. The hierarchical LiFePO 4 /C microspheres exhibited a high tap density and a large specific surface area. The electrochemical properties of the sample were investigated. The sample exhibited a better rate capability and a better cyclability than the coral-like LiFePO 4 /C cathode material, and these were ascribed to the highly uniform carbon coating and the self-assembled nanoparticles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2015
·
IF 2.11
Jiaying Bi,Tongbao Zhang,Kai Wang,Benhe Zhong,Guangsheng Luo
Lithium phosphate hollow nanospheres were prepared in a membrane dispersion microreactor using aqueous phosphoric acid and lithium hydroxide solutions as reactants. The influences of reactant flow rate ratio and temperature on the purity and morphology of the prepared nanospheres were investigated using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results showed that nanospheres prepared in the continuous flow condition had a hollow interior structure with high crystallinity. A possible mechanism for the formation of this hollow structured Li 3 PO 4 was also proposed. Using Li 3 PO 4 hollow nanospheres as the precursor, LiFePO 4 hollow nanospheres were successfully synthesized via a solvothermal route in ethylene glycol. After coating with carbon, the LiFePO 4 /C hollow nanospheres exhibited excellent electrochemical performance, especially at high rates, and could discharge124 mAh/g at 10 C, and even 98 mAh/g at 40 C.
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 Materials Chemistry A
·
2013
·Vol. 1
·期 47
·15016-15021
·
IF 0
Qianru Shi,Lixin Xue,Zengbin Wei,Fu Liu,Xudong Du,Darryl D. DesMarteau
Lithiated poly(perfluoroalkylsulfonyl)imide (PFSILi) ionene is synthesized and blended with poly(vinylidene) difluoride (PVDF) to serve as binder for the electrode of a lithium ion battery. The incorporation of the PFSILi ionene adds ionic conducting channels inside the electrodes and prevents electrolyte depletion during rapid charging–discharging. The small composition change results in an increase in the battery performance, including a better reversibility, lower polarization or internal resistance and an improved discharge capacity, as well as a higher energy density at high rates or elevated temperatures. At the rate of 2 C and 60 °C, the discharge plateau potential for the cell with the ionene based binder is 0.29 V higher than that for the cell with a PVDF only cathode binder. At a 4 C rate, the discharge capacity and energy density of a LiFePO4–Li half-cell with the ionic binder are 50% and 66%, respectively, higher than those of the cell using the nonionic PVDF binder at room temperature. Thus, the ionene polymer offers a new route, rather than just altering the active materials, to overcome the limitations of capacity and power density for rechargeable lithium batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Yichao Tong,Changlei Qin,Xianqing Zhu,Zongze Lv,Xin Huang,Jie Chen
Renewable energy and electric vehicles are well-acknowledged strategies for reducing CO2 emissions, and their development relies heavily on the core of energy storage systems using lithium-ion batteries. However, recycling of lithium-ion batteries is far from mature, and massive abandonment of spent batteries would lead to severe environmental pollution. Meanwhile, the shortage of lithium resources brought about by the rapid development of lithium-ion batteries, especially LiFePO4, significantly drives up the preparation cost of Li4SiO4 as a promise sorbent and greatly limits its application as a CO2 capture scheme. Hence, a strategy is urgently needed to alleviate the lithium resource contradiction between energy storage and CO2 mitigation. Herein, we report a novel concept in recycling spent LiFePO4 battery to prepare high-efficiency and low-cost Li4SiO4 sorbents for CO2 capture. The obtained Li4SiO4 sorbents demonstrate very stable CO2 capacities of 0.27–0.28 g/g in a typical test up to 80 cycles, a leading level in CO2 capture, while the cost is only 1/6 of the conventional preparation process. It suggests that the concept of recycling spent LiFePO4 for CO2 capture has broad implications on resource utilization of energy waste and the mitigation of CO2 emissions.
✓ 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）