Synthesis and optimization of three-dimensional lamellar LiFePO 4 and nanocarbon composite cathode materials by polyol process

Lu, Jiming; Zhou, Yingke; Jiang, Tingting; Tian, Xiaohui; Tu, Xiaofeng; Wang, Pengcheng

doi:10.1016/j.ceramint.2015.09.063

Cited by 27 publications

(7 citation statements)

References 36 publications

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“…With the further increase of the calcination temperature, undesirable particle growth is seen, leading to heterogeneous larger particles. These results suggest that the crystallinity and particle size of LFP could be improved by adjusting the calcination temperature, which may have effects on the electrochemical performance of the composites (Lu et al , 2016; Kim et al , 2007).…”

Section: Resultsmentioning

confidence: 91%

Enhanced electrochemical performances of LiFePO₄-C synthesized with PEG as the grain growth inhibitor for Li-ion capacitors in LiNO₃ aqueous electrolyte

Shen

Zhang²,

et al. 2017

PRT

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Purpose The purpose of this paper is to conduct the synthesization of LiFePO4-C (LFP-C) with fine particle size and enhanced electrochemical performance as the positive electrode material for Li-ion capacitors (LICs) with neutral aqueous electrolyte. Design/methodology/approach LFP-C was prepared by using polyethylene glycol (PEG) as a grain growth inhibitor, and the effects of the calcination temperature and PEG content on the structure and morphology of LFP-C were investigated. LICs using environment-friendly, safe and low-cost LiNO3 aqueous electrolyte were assembled with LFP-C as the positive electrode and active carbon as the negative electrode. The electrochemical performances of LFP-C and LICs were studied. Findings The results show that the particle size of LFP-C decreases significantly through the introduction of PEG. Cyclic voltammetry results show that the LFP-C prepared at 550°C with 1.0 g PEG exhibits the highest Cpe of 725 F/g at the scanning rate of 5 mA/s. Compared to LFP prepared without PEG, the electrochemical performance of optimized LFP-C dramatically increases due to the decrease of the particle size. Moreover, the LIC assembled with the optimized LFP-C exhibits excellent electrochemical performances. The LIC maintains about 91.3 per cent of its initial Cps after 200 cycles which shows a good cycling performance. Research limitations/implications The LFP-C is the suitable positive electrode material for LICs with neutral aqueous electrolyte. LICs can be used in the field of automobiles and can solve the problems of energy shortage and environmental pollution. Originality/value Both the LFP-C with fine particle size and its optimal LIC using environment-friendly, safe and low-cost LiNO3 aqueous electrolyte own good electrochemical performances.

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Section: Resultsmentioning

confidence: 91%

Enhanced electrochemical performances of LiFePO₄-C synthesized with PEG as the grain growth inhibitor for Li-ion capacitors in LiNO₃ aqueous electrolyte

Shen

Zhang²,

et al. 2017

PRT

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“…where R, T, A, n, F, C respectively represent the gas constant, absolute temperature, surface area of the cathode, charge transfer number of, Faraday constant, Li + concentration, and σ is the Warburg factor related to the angular frequency ω and the imaginary impedance (-Zim/Ω) based on the formula (2) [15,18]:…”

Section: N2 Adsorption/desorption Isotherms Of the Composites Are Meamentioning

confidence: 99%

“…In general, the electrochemical performance/cost of LIBs depend mainly on the utilized component materials and especially that on the positive electrode [1]. LiFePO4 (LFP) is a competitive candidate for the positive electrode, primarily due to the advantages of high specific capacity, long cycle life, high safety, low price and no poison [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…To solve the transport limitations of ion and electron, numerous works have been reported, including heteroatom doping [18][19], particle size optimizing [20][21] and micro-sturcture design [22][23][24], and coating with conductive layers (conductive polymer, metal oxide or carbonaceous nanomaterials) [15,[22][23][24][25][26]. These strategies can enhance the Li storage performance of LFP, for instance, when the nanoscale LFP particle is used, an effectively enhanced specific capacity has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…Graphene demonstrates a lot of outstanding chemical/physical attributes and possesses intriguing advantages as a conductive reagent for electrode materials, mainly because of the tremendous specific surface area and high conductivity [7,[31][32][33]. The performances of electrode materials usually enhanced significantly when formed composites with graphene, and it has been reported that LFP/graphene composites displayed even better performance compared to the LFP/carbon black or nanotube composites [15,[23][24]. However, the Hummers method is commonly employed to prepare graphene oxide, and the subquent reduction process usually cause the re-stack of graphene oxide, resulting in substantial decrease of the surface area and deterioration of the utilization efficiency [34].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel “holey-LFP / graphene / holey-LFP” sandwich nanostructure with significantly improved rate capability for lithium storage

Tian

Zhou

et al. 2019

Electrochimica Acta

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The development of high-performance and new-structure electrode materials is vital for the wide application of rechargeable lithium batteries in electric vehicles. In this work, we design a special composite electrode structure with the macroporous threedimensional graphene areogel framework supporting mesoporous LiFePO4 nanoplate. It is realized using a simple sol-gel deposition method. The highly conductivity graphene nanosheets assemble into an interconnected three-dimensional macroporous areogel framework, while LiFePO4 grows along the graphene nanosheets and generates a mesoporous nanoplate structure. In comparison with LiFePO4, this unique sandwich nanostructure offers a greatly increased electronic conductivity thanks to the framework of graphene nanosheets. Also, the bimodal porous structure of the composite remarkably increases the interface between the electrode/electrolyte and facilitates the transport of Li + throughout the electrode, enabling the superior specific capacity, rate characteristic and cyclic retention.

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Nanocarbon Materials: Synthesis of Newly Discovered Carbon Nanoframes and Hollow Carbon Nanocubes

Lin,

Du,

Zhang

et al. 2024

Adv Materials Inter

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Nanocarbons are emerging at the forefront of nanoscience, and a wide variety of nanocarbons with unique structures have appeared over the past two decades. Currently, many carbon nanostructures have not been synthesized in the field of nanocarbons. The focus of this work is to present a new ideology and report two carbon nanostructures that have never been reported before. Inspired by the phenomenon of crystal growth, a new concept of thought is proposed. In brief, the diversity of crystal structures is utilized to enable surfactants to replicate their framework structures to create carbon nanomaterials with novel structures. In this work, carbon nanoframes (CNFEs) and hollow carbon nanocubes (HCNBs) synthesized by the 3‐(N,N‐dimethyldodecylammonio) propanesulfonate (SB3‐12)@NaCl self‐assembly strategy are used as proof of the ideology concept. It is shown that the prepared CNFEs have tunable dimensions (320–565 nm) and specific optical properties (fluorescence). The obtained HCNBs are 575 ± 20 nm in size and have fluorescent properties. It is found that changes in the concentration of SB3‐12 are a key driver of size changes, especially morphological evolution. It is believed that the ideology of this work provides a new entry point for the synthesis of carbon nanomaterials.

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Synthesis and optimization of three-dimensional lamellar LiFePO 4 and nanocarbon composite cathode materials by polyol process

Cited by 27 publications

References 36 publications

Enhanced electrochemical performances of LiFePO₄-C synthesized with PEG as the grain growth inhibitor for Li-ion capacitors in LiNO₃ aqueous electrolyte

Enhanced electrochemical performances of LiFePO₄-C synthesized with PEG as the grain growth inhibitor for Li-ion capacitors in LiNO₃ aqueous electrolyte

A novel “holey-LFP / graphene / holey-LFP” sandwich nanostructure with significantly improved rate capability for lithium storage

Nanocarbon Materials: Synthesis of Newly Discovered Carbon Nanoframes and Hollow Carbon Nanocubes

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Synthesis and optimization of three-dimensional lamellar LiFePO 4 and nanocarbon composite cathode materials by polyol process

Cited by 27 publications

References 36 publications

Enhanced electrochemical performances of LiFePO4-C synthesized with PEG as the grain growth inhibitor for Li-ion capacitors in LiNO3 aqueous electrolyte

Enhanced electrochemical performances of LiFePO4-C synthesized with PEG as the grain growth inhibitor for Li-ion capacitors in LiNO3 aqueous electrolyte

A novel “holey-LFP / graphene / holey-LFP” sandwich nanostructure with significantly improved rate capability for lithium storage

Nanocarbon Materials: Synthesis of Newly Discovered Carbon Nanoframes and Hollow Carbon Nanocubes

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Enhanced electrochemical performances of LiFePO₄-C synthesized with PEG as the grain growth inhibitor for Li-ion capacitors in LiNO₃ aqueous electrolyte

Enhanced electrochemical performances of LiFePO₄-C synthesized with PEG as the grain growth inhibitor for Li-ion capacitors in LiNO₃ aqueous electrolyte