Enhanced high rate and low-temperature performances of mesoporous LiFePO4/Ketjen Black nanocomposite cathode material

Xu, Yang; Xu, Yisheng; Zhang, Huang; Huang, Yong’an; Jiang, Qiong; Zhao, Chongjun

doi:10.1016/j.electacta.2013.10.037

Cited by 44 publications

(12 citation statements)

References 35 publications

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“…However, cathode materials with inferior electrochemical performances restrict the development of LIBs as a bottleneck. The widely used cathode materials, such as LiCoO 2 [7][8], LiFePO 4 [9][10][11], LiNi 1/3 Mn 1/3 Co 1/3 O 2 and LiMn 2 O 4 [12][13], with low discharge capacities (lower than 200 mAh g −1 )…”

Section: Introductionmentioning

confidence: 99%

Self-template processed hierarchical V2O5 nanobelts as cathode for high performance lithium ion battery

Niu

Jin

et al. 2015

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Self-template processed hierarchical V2O5 nanobelts as cathode for high performance lithium ion battery

Niu

Jin

et al. 2015

Electrochimica Acta

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“…Figure 5 is the distribution of additives of nanoparticles in greases which can explain the improvement of the conductive capacity. Attributable to the rich branch structure of KB nanoparticles, there is always a part of KB gathering together or only separated by very thin oil membrane layers (Yang et al , 2013; Zhang et al , 2011). Then the electrons activated by thermal vibration or strong internal electric field can cross the barrier formed by the oil membrane layer and jump to the adjacent nanoparticles, forming a larger tunnel current (Simmons, 1963; Li et al , 1997; Beek and Pul, 2003; David, 2000).…”

Section: Resultsmentioning

confidence: 99%

Conductive capacity and tribological properties of several carbon materials in conductive greases

Cao

Xia

2016

ILT

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Purpose The purpose of this paper is to synthesize a new kind of conductive grease which possesses a prominent conductive capacity and good tribological properties. Design/methodology/approach A two-step method was used to prepare complex lithium-based grease. Ketjen black (KB), acetylene black (AB) and carbon black (CB) were characterized by transmission electron microscope and used as lubricant additives to prepare conductive greases. Conductive capacity was evaluated by a conductivity meter, a surface volume resistivity meter and a circuit resistance meter. Tribological properties were investigated by a reciprocating friction and wear tester (MFT-R4000). The worn surfaces were analyzed by a scanning electron microscope, Raman spectroscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscope. Findings The conductive grease prepared with KB has a prominent conductive capacity at room temperature, 100°C and 150°C. Further, this conductive grease also possesses better tribological properties than AB and KB greases. When the concentration of KB is 1.8 Wt.%, the coefficient of friction and wear width reduced by 11 and 14 per cent, respectively. Originality/value This work is a new application of nanometer KB as a lubricant additive in grease, which provides a direction for preparing conductive grease. The conductivity and tribology experiments have been carried out though the variation of experiment conductions.

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“…Additionally, carbon deposition or coating on the surface of LFP particles in a reducing atmosphere also helps to limit the growth or agglomeration of LFP particles 11 . Since the outstanding revolution of carbon materials, the unique characteristics come up with their own shapes such as spheres [12][13][14][15] , nanotubes [16][17][18] , nanofibers 19,20 , or sheets (graphene) [21][22][23] . These advantages could be potentially exploited for different purposes of materials improvement.…”

Section: Introductionmentioning

confidence: 99%

“…However, the morphology of carbon, if not properly integrated, sometimes restrains lithium ion movements in olivine structure and decreases the energy density in LFP/C composite. Apart from the above approaches, multivalent cations are usually used as suitable dopants for LFP to enhance high current rate performance as well as reduce polarization 14 . However, this increase of conductivity is doubted whether dopants could penetrate easily into LFP lattice and conduct the formation of surface conductive phases 8 .…”

Section: Introductionmentioning

confidence: 99%

The impact of carbon additives on lithium ion diffusion kinetic of LiFePO4/C composites

Duc

Nguyen

et al. 2019

Sci. Tech. Dev. J.

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Introduction: LiFePO4/C composites were synthesized via physical mixing assisted solvothermal process. Different kinds of carbon materials were investigated including 0D (carbon Ketjen black), 1D (carbon nanotubes) and 2D (graphene) materials. X-rays diffraction patterns of carbon coated LiFePO4 synthesized by solvothermal was indexed to pure crystalline phase without the emergence of second phase. LiFePO4 platelets and rods were in range size of 80-200 nm and dispersed well in carbon matrix. The lithium ion diffusion kinetics was evaluated through the calculated diffusion coefficients to explore the impact of carbon mixing. Methods: In this work, we studied the structure, morphologies and the lithium ion diffusion kinetic of LiFePO4/C composites for Li-ion batteries. Different characterization methods were used including powder X-rays (for crystalline structure); Transmission Electron Microscopy (for particle and morphologies observation) and Cyclic voltammetry (for electrochemical kinetic study). Results: The study indicated LiFePO4/C composites were successfully obtained by mixing process and the electrochemical performance throughout the calculated diffusion coefficient was significantly improved by adding the carbon types. Conclusion: The excellent ion diffusion was obtained for composites LiFePO4/Ketjen black (KB) and LiFePO4/CNT compared to LiFePO4/Graphene. KB could be a potential candidate for large-scale production due to low-cost, stable and high electrochemical performance.

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Enhanced high rate and low-temperature performances of mesoporous LiFePO4/Ketjen Black nanocomposite cathode material

Cited by 44 publications

References 35 publications

Self-template processed hierarchical V2O5 nanobelts as cathode for high performance lithium ion battery

Self-template processed hierarchical V2O5 nanobelts as cathode for high performance lithium ion battery

Conductive capacity and tribological properties of several carbon materials in conductive greases

The impact of carbon additives on lithium ion diffusion kinetic of LiFePO4/C composites

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