Effects of the aspect ratio of the conductive agent on the kinetic properties of lithium ion batteries

Song, Hyeonjun; Oh, Yeonjae; Çakmakçı, Nilüfer

doi:10.1039/c9ra09609d

Cited by 17 publications

(10 citation statements)

References 32 publications

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“…This effect was attributed to the MWCNT in HBP as a composite material that improved the electrochemical performance, signifying higher electronic conductivity, structural stability, and influencing the Li þ diffusion coefficient in the electrode. [9,24] In addition, the increase in the deintercalation of Li ions at lower voltage was observed in the HBP/MWCNT composite electrode. After a few formation cycles, the activation process and structural stability were established with stable cycling reversibility (Figure S5, Supporting Information).…”

Section: Resultsmentioning

confidence: 90%

“…Relatively, the charge transfer resistance of the HBP/MWCNT composite electrode before and after cycling was similar, confirming more stable electrochemical performance because of the superior intrinsic conductivity of HBP/MWCNT influencing the diffusion coefficient of lithium ions. [9,24,28] Furthermore, the increase in the charge transfer resistance in the HBP electrode due to the formation of an SEI layer during cycling resulted in the capacity fading. However, the benefit of a relatively low resistance effect due to the SEI layer in the HBP/MWCNT composite electrode was observed, corresponding to rapid charge transport and enhanced electrochemical performance.…”

Section: Discussionmentioning

confidence: 99%

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Hyperbranched Polyphenylene as an Electrode for Li‐Ion Batteries

et al. 2021

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Polymeric electrodes have attracted considerable attention for their potential as Li-ion battery (LIB) electrodes due to their tunable structures and sustainable preparation from abundant precursors in an environmentally friendly manner. Herein, hyperbranched polyphenylene (HBP) is synthesized through Suzuki polycondensation and investigated as a potential bipolar electrode for LIBs. The advantages of the hyperbranched architecture in HBP include easy and fast transportation of ions as an electrode. Brunauer-Emmett-Teller (BET) measurement on HBP reveals a high specific surface area and porosity compared with typical linear polymers. The low conductivity in HBP is improved by preparing an HBP/multiwalled carbon nanotube (MWCNT) composite material. The LIB performance for the HBP/MWCNT composite anode electrode shows good cyclic stability and high specific capacity, which are caused by the branching architecture, surface area, and improved electronic conductivity from the MWCNT. This results in easy access and rapid movement of Li ions for improved charge-discharge performance. The ex situ technique using Fourier transform infrared spectroscopy shows a lithium storage mechanism in the HBP electrode. This work shows extensive scope for using the hyperbranched architectural concept to explore and develop high-performing organic electrodes for future metal-ion batteries.

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Section: Resultsmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Hyperbranched Polyphenylene as an Electrode for Li‐Ion Batteries

et al. 2021

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“…The Li + diffusion coefficient during the charge/discharge process for all the three types of samples can be calculated according to the Randles–Sevcik equation. [ 46 ] The Li + diffusion coefficient of BMC‐1400 was 1.65 × 10 −9 cm s −1 , much higher than that of CNT (2.5 × 10 −10 cm s −1 ) and Super‐P (1.6 × 10 −10 cm s −1 ). These results demonstrate that the BMC‐1400 with mesoporous structures is beneficial to the Li + diffusion in the electrode system and hence enhance the high‐rate charge/discharge performance of LiFePO 4 .…”

Section: Resultsmentioning

confidence: 99%

Mesoporous Carbon as Conductive Additive to Improve the High‐Rate Charge/Discharge Capacity of Lithium‐Ion Batteries

et al. 2022

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The infiltration ability of electrolytes in to the electrode is vital to the high‐rate charge/discharge capacity of lithium‐ion batteries (LIBs). Herein, mesoporous carbon is used with abundant and continuous mesoporous channels as the conductive additive in LIBs to enhance the infiltration of electrolytes. The Li+ diffusion coefficient of the mesoporous carbon is 1.65 × 10−9 cm s−1, much higher than that of carbon nanotubes (2.5 × 10−10 cm s−1) and carbon black (1.6 × 10−10 cm s−1). It is demonstrated that LiFePO4 cathode‐based LIBs using mesoporous carbon as the conductive additive exhibit excellent high‐rate charge/discharge capacities of 121 mAh g−1 at 5 C and 54 mAh g−1 at 30 C. When the compaction density of the LiFePO4 electrode increases from 0.7 to 1.3 g cm−3, the LIBs can still deliver a capacity of 101 mAh g−1 at 3 C. This work paves a new route to facilely improve the quick charge/discharge performance of LIBs.

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“…Particularly, carbon black (CB), which is inexpensive, has excellent electrical conductivity and stable electrochemical properties [ 13 ]. CB is a 0 dimension material [ 14 ] and and is a form of amorphous carbon with a low aspect ratio and low electrical conductivity comparative to other carbons. These disadvantages make it unsuitable for batteries that require high power density, with the electron movement being a limiting factor at high C-rates.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Electrochemical Performance with Dispersion Degree of CNTs in Electrode According to Ultrasonication Process and Slurry Viscosity for Lithium-Ion Battery

et al. 2022

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Lithium-ion batteries (LIBs) continue to dominate the battery market with their efficient energy storage abilities and their ongoing development. However, at high charge/discharge C-rates their electrochemical performance decreases significantly. To improve the power density properties of LIBs, it is important to form a uniform electron transfer network in the cathode electrode via the addition of conductive additives. Carbon nanotubes (CNTs) with high crystallinity, high electrical conductivity, and high aspect ratio properties have gathered significant interest as cathode electrode conductive additives. However, due to the high aggregational properties of CNTs, it is difficult to form a uniform network for electron transfer within the electrode. In this study, to help fabricate electrodes with well-dispersed CNTs, various electrodes were prepared by controlling (i) the mixing order of the conductive material, binder, and active material, and (ii) the sonication process of the CNTs/NMP solution before the electrode slurry preparation. When the binder was mixed with a well sonicated CNTs/NMP solution, the CNTs uniformly adsorbed to the then added cathode material of LiNi0.6Co0.2Mn0.2O2 and were well-dispersed to form a flowing uniform network. This electrode fabrication process achieved > 98.74% capacity retention after 50 cycles at 5C via suppressed polarization at high current densities and a more reversible H1-M phase transition of the active material. Our study presents a novel design benchmark for the fabricating of electrodes applying well-dispersed CNTs, which can facilitate the application of LIBs in high current density applications.

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Effects of the aspect ratio of the conductive agent on the kinetic properties of lithium ion batteries

Abstract: We fabricated lithium-ion batteries (LIBs) using the Super P and carbon nanotubes (CNTs) as conductive agents to investigate the effect of the aspect ratio of conductive agent on the kinetic properties of LIB.

Cited by 17 publications

References 32 publications

Hyperbranched Polyphenylene as an Electrode for Li‐Ion Batteries

Hyperbranched Polyphenylene as an Electrode for Li‐Ion Batteries

Mesoporous Carbon as Conductive Additive to Improve the High‐Rate Charge/Discharge Capacity of Lithium‐Ion Batteries

Analysis of Electrochemical Performance with Dispersion Degree of CNTs in Electrode According to Ultrasonication Process and Slurry Viscosity for Lithium-Ion Battery

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