Ionic conduction through heterogeneous solids: Delineation of the blocking and space charge effects

Kumar, Binod; Nellutla, Sudeepthi; Thokchom, Joykumar S.; Chen, Christina

doi:10.1016/j.jpowsour.2006.02.062

Cited by 57 publications

(43 citation statements)

References 7 publications

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“…Such an observation of the effect of an electric field on conductivity of heterogeneous electrolytes has also been reported earlier [13]. This observation has been explained by experimental evidence [3] that an interaction involving dielectric phase and conducting ions occurs in heterogeneous electrolytes. The interaction for the PEG:LiClO 4 (8:1)-MgO (20 wt.%) electrolyte is expressed by the following equation:…”

Section: Effect Of Applied DC Potentialsupporting

confidence: 80%

“…The low interaction energy suggests that the immobilized ions can be destabilized by using either thermal or electrical energy. The destabilization by the use of thermal energy has been demonstrated in an earlier publication [3]. The destabilization due to electrical energy and its resulting effects will be presented in the remainder of this paper.…”

Section: Time Dependence Of Conductivitymentioning

confidence: 84%

“…The localized electric field assists in the transport of the conducting ions and therefore the conductivity increases with time. The MgO-Li + interaction energy is estimated to be around 4.8065 × 10 −22 J [3]. The low interaction energy suggests that the immobilized ions can be destabilized by using either thermal or electrical energy.…”

Section: Time Dependence Of Conductivitymentioning

confidence: 99%

“…The nature of the interaction between the ions and the dielectric dopant was believed to be driven by the dielectric constant gradient [2]. Subsequent investigations [3,4] of composites involving a single lithium ion conductor and a dielectric phase have clearly demonstrated that the interaction involves immobilization of the charge carriers at or around the dielectric surfaces. The immobilized charge carriers act like sources of electric fields that radiate from the point charges.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A direct current pulse technique to enhance conductivity of heterogeneous electrolytes

Gupta¹,

Thokchom²,

Kumar³

2008

Journal of Power Sources

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Section: Effect Of Applied DC Potentialsupporting

confidence: 80%

Section: Time Dependence Of Conductivitymentioning

confidence: 84%

Section: Time Dependence Of Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A direct current pulse technique to enhance conductivity of heterogeneous electrolytes

Gupta¹,

Thokchom²,

Kumar³

2008

Journal of Power Sources

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“…These two situations -blocking and space charge models -have been proposed earlier to explain conductivity of heterogeneous solids [6]. The influence of the blocking entity is perhaps easier to comprehend and is schematically shown in Fig.…”

Section: Blocking and Space Charge Effectsmentioning

confidence: 87%

Heterogeneous electrolytes: Variables for and uncertainty in conductivity measurements

Kumar¹

2008

Journal of Power Sources

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Multi‐Interface Strategy for Electrode Tailoring Toward Fast‐Charging Lithium‐Ion Batteries

Choi,

Lee,

Lee

et al. 2024

Adv Funct Materials

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Thick and dense graphite anodes used in lithium‐ion batteries (LIBs) suffer from sluggish reaction kinetics at the electrode level, causing Li metal plating on their surfaces and significant capacity decay at high charging currents. Thus, it is crucial to tailor electrodes based on a comprehensive understanding of the complex reaction kinetics to realize fast‐charging LIBs. A multi‐interface strategy is proposed for electrode tailoring using Al2O3 nanoparticles to enhance fast‐charging capability while suppressing Li metal plating. Molecular dynamics simulations suggest that the incorporated Al2O3 nanoparticles perturb the charge and molecule distributions in the boundary layer, forming an “interfacial highway” for facile Li+ transport at the Al2O3/electrolyte interface. This pushes Li+ deeper into the electrode and homogenizes the Li+ flux across the electrode's top surface. A full cell assembled with the Al2O3‐decorated graphite electrode (areal capacity of 4.4 mAh cm−2) exhibits excellent cyclability with a capacity retention of 83.4% over 500 cycles even at a 2C rate without any noticeable signal for undesirable Li plating. The role of interfacial highways predicted by theoretical computations is further validated using a pouch‐type full cell (500 mAh). These findings provide insights into the interfacial and microstructural design of high‐capacity graphite electrodes for fast‐charging, long‐cycling LIBs.

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Ionic conduction through heterogeneous solids: Delineation of the blocking and space charge effects

Cited by 57 publications

References 7 publications

A direct current pulse technique to enhance conductivity of heterogeneous electrolytes

A direct current pulse technique to enhance conductivity of heterogeneous electrolytes

Heterogeneous electrolytes: Variables for and uncertainty in conductivity measurements

Multi‐Interface Strategy for Electrode Tailoring Toward Fast‐Charging Lithium‐Ion Batteries

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