Improved Electrochemical Performance of LiFePO<sub>4</sub>@N-Doped Carbon Nanocomposites Using Polybenzoxazine as Nitrogen and Carbon Sources

Wang, Ping; Zhang, Geng; Li, Zhichen; Sheng, Wangjian; Zhang, Yichi; Gu, Jiangjiang; Zheng, Xuejun; Cao, Fuyang

doi:10.1021/acsami.6b10594

Cited by 79 publications

(47 citation statements)

References 47 publications

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“…In comparison with other studies that tried to improve the rate performance of LiFePO 4 by materials modification and novel synthesis approach which can improve the discharge capacity to over 100 mAhg −1 (10 C) [ 25 , 26 ], the rate performance presented in this study is not charming. There are two reasons limiting the improvement of rate performance.…”

Section: Resultsmentioning

confidence: 65%

Fabrication and Characterization of 3D-Printed Highly-Porous 3D LiFePO4 Electrodes by Low Temperature Direct Writing Process

Liu

Cheng

et al. 2017

Materials

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LiFePO4 (LFP) is a promising cathode material for lithium-ion batteries. In this study, low temperature direct writing (LTDW)-based 3D printing was used to fabricate three-dimensional (3D) LFP electrodes for the first time. LFP inks were deposited into a low temperature chamber and solidified to maintain the shape and mechanical integrity of the printed features. The printed LFP electrodes were then freeze-dried to remove the solvents so that highly-porous architectures in the electrodes were obtained. LFP inks capable of freezing at low temperature was developed by adding 1,4 dioxane as a freezing agent. The rheological behavior of the prepared LFP inks was measured and appropriate compositions and ratios were selected. A LTDW machine was developed to print the electrodes. The printing parameters were optimized and the printing accuracy was characterized. Results showed that LTDW can effectively maintain the shape and mechanical integrity during the printing process. The microstructure, pore size and distribution of the printed LFP electrodes was characterized. In comparison with conventional room temperature direct ink writing process, improved pore volume and porosity can be obtained using the LTDW process. The electrochemical performance of LTDW-fabricated LFP electrodes and conventional roller-coated electrodes were conducted and compared. Results showed that the porous structure that existed in the printed electrodes can greatly improve the rate performance of LFP electrodes.

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Section: Resultsmentioning

confidence: 65%

Fabrication and Characterization of 3D-Printed Highly-Porous 3D LiFePO4 Electrodes by Low Temperature Direct Writing Process

Liu

Cheng

et al. 2017

Materials

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“…The structural changes of TRGs are monitored with their Raman spectra (Figure d). TRGs have a clearly characteristic G band at 1584 cm −1 , which is attributed to the vibration of sp 2 ‐bonded atoms in a two‐dimensional hexagonal lattice . Their gradually weakened D band at 1343 cm −1 is caused by increasing the thermal annealing temperatures.…”

Section: Resultsmentioning

confidence: 99%

Effects of Graphene Quality on Lithium Storage Performances of Fe₃O₄/Thermally Reduced Graphene Oxide Hybrid Anodes

et al. 2019

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Till now, there are no systematic reports on the effect of the quality of thermally reduced graphene oxide (TRG) on lithium storage properties, as the reported methods to fabricate graphene-based electrodes are usually not effective enough to reduce graphene oxides to graphene. Herein, graphite oxide is thermally exfoliated and annealed with a high-temperature graphitization oven at different temperatures (800-2000°C). A series of Fe 3 O 4 /TRG hybrids are synthesized as anode materials for lithium-ion batteries with TRGs acting as substrates of in-situ formed Fe 3 O 4 nanoparticles. Both, the electroconductivity of the TRGs and their interfacial interaction with Fe 3 O 4 influence the lithium storage performances of the hybrids. However, the electroconductivity of the TRGs and the formation of interfacial bonds are conflicting. Because the oxygen-containing groups and defects of TRG are greatly removed leading to enhanced electrical conductivity with the increase of thermal annealing temperature. Hence, the resulting Fe 3 O 4 /TRG hybrids show first decreased then increased electrochemical performances with increasing annealed temperatures. In a word, the effect of interfacial interaction is dominant at a relatively low annealing temperature, while the effect of conductivity is dominant at a relatively high annealing temperature. The optimized hybrids exhibit excellent cycling and rate performances. This work should provide useful information for the rational design and construction of high-performance electrodes for energy storage applications.

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“…A systematic enhancement of the number of oxazine functionality in symmetric fashion in the monomer from 1 to 4 (Figure 6a) led to a decrease in T p from 265 to 190 • C as a result of close proximity of benzoxazine units [87]. The values of T g (58-109 • C), thermal stability (T 5% 355-391 • C), char yield (13-37%), limiting oxygen index (LOI) (23)(24)(25)(26)(27)(28)(29)(30)(31) and storage modulus (3.6-66.5 MPa) improved significantly due to the growth of polymer network from one-to four-directions. [87,[143][144][145][146][147].…”

Section: Multi-oxazine Functional Monomersmentioning

confidence: 99%

“…In general, PBzs emerged as a promising class of thermoset polymers exhibiting versatility in a wide range of applications including adhesives [9][10][11][12][13][14], flame resistant polymers [15][16][17][18], cathodic material in batteries [19][20][21][22][23][24], coatings [14,[25][26][27][28], materials for aerospace applications [29], carbon dioxide adsorbent [30][31][32][33][34], detection of metal ions [35][36][37][38], 3D printing [39] and electronics [40,41]. Besides effective compatibilization with many polymers, they also offer notable properties such as good mechanical strength [42][43][44][45][46][47][48], high thermal stability [49][50][51][52][53][54]…”

Section: Introductionmentioning

confidence: 99%

Review on the Accelerated and Low-Temperature Polymerization of Benzoxazine Resins: Addition Polymerizable Sustainable Polymers

et al. 2021

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Due to their outstanding and versatile properties, polybenzoxazines have quickly occupied a great niche of applications. Developing the ability to polymerize benzoxazine resin at lower temperatures than the current capability is essential in taking advantage of these exceptional properties and remains to be most challenging subject in the field. The current review is classified into several parts to achieve this goal. In this review, fundamentals on the synthesis and evolution of structure, which led to classification of PBz in different generations, are discussed. Classifications of PBzs are defined depending on building block as well as how structure is evolved and property obtained. Progress on the utility of biobased feedstocks from various bio-/waste-mass is also discussed and compared, wherever possible. The second part of review discusses the probable polymerization mechanism proposed for the ring-opening reactions. This is complementary to the third section, where the effect of catalysts/initiators has on triggering polymerization at low temperature is discussed extensively. The role of additional functionalities in influencing the temperature of polymerization is also discussed. There has been a shift in paradigm beyond the lowering of ring-opening polymerization (ROP) temperature and other areas of interest, such as adaptation of molecular functionality with simultaneous improvement of properties.

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Improved Electrochemical Performance of LiFePO₄@N-Doped Carbon Nanocomposites Using Polybenzoxazine as Nitrogen and Carbon Sources

Cited by 79 publications

References 47 publications

Fabrication and Characterization of 3D-Printed Highly-Porous 3D LiFePO4 Electrodes by Low Temperature Direct Writing Process

Fabrication and Characterization of 3D-Printed Highly-Porous 3D LiFePO4 Electrodes by Low Temperature Direct Writing Process

Effects of Graphene Quality on Lithium Storage Performances of Fe₃O₄/Thermally Reduced Graphene Oxide Hybrid Anodes

Review on the Accelerated and Low-Temperature Polymerization of Benzoxazine Resins: Addition Polymerizable Sustainable Polymers

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Improved Electrochemical Performance of LiFePO4@N-Doped Carbon Nanocomposites Using Polybenzoxazine as Nitrogen and Carbon Sources

Cited by 79 publications

References 47 publications

Fabrication and Characterization of 3D-Printed Highly-Porous 3D LiFePO4 Electrodes by Low Temperature Direct Writing Process

Fabrication and Characterization of 3D-Printed Highly-Porous 3D LiFePO4 Electrodes by Low Temperature Direct Writing Process

Effects of Graphene Quality on Lithium Storage Performances of Fe3O4/Thermally Reduced Graphene Oxide Hybrid Anodes

Review on the Accelerated and Low-Temperature Polymerization of Benzoxazine Resins: Addition Polymerizable Sustainable Polymers

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Product

Resources

About

Improved Electrochemical Performance of LiFePO₄@N-Doped Carbon Nanocomposites Using Polybenzoxazine as Nitrogen and Carbon Sources

Effects of Graphene Quality on Lithium Storage Performances of Fe₃O₄/Thermally Reduced Graphene Oxide Hybrid Anodes