Assessment of the Wettability of Porous Electrodes for Lithium-Ion Batteries

Wu, Mao‐Sung; Liao, Tzu-Ling; Wang, Yung-Yun; Wan, Chi‐Chao

doi:10.1023/b:jach.0000035599.56679.15

Cited by 123 publications

(91 citation statements)

References 8 publications

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“…Increased wettability leads to better contact between electrode materials and electrolyte, i.e., increased double layer which increases the double layer capacitance and reduces ion-transport resistance [29]. These two mechanisms along with SEI growth due to cycling mainly dominate the degradation of cell performance reported in this study.…”

Section: Discussionmentioning

confidence: 65%

“…When wettability increases, the double layer area increases, which in-turn increases the double layer capacitance and reduces ion-transport resistance [29]. The smaller semicircle on the Nyquist plot after applying pressure, as shown in Figure 4, suggests better wettability of the electrodes.…”

Section: Impedance Raise With Cycling At Different Pressurementioning

confidence: 98%

“…Separator creep reduces ionic conductivity from electrode to electrode, which directly contributes to Ro. In contrast, when pressure is applied, the contact between electrode particles and electrolyte improves (i.e., there is improved wettability) [29] which increases the overall effective double layer area of the cell, contributing to the increase of Cdl and decrease of Rct. However, considering that the morphology of electrode particles are not changed (no particle cracking) due to the pressure, the solid-state diffusion contributing to the Warburg tail remains the same.…”

Section: Effect Of Applying External Pressurementioning

confidence: 99%

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The effect of external compressive loads on the cycle lifetime of lithium-ion pouch cells

Barai

Tangirala

Uddin

et al. 2017

Journal of Energy Storage

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KeywordsLithium-ion battery; external pressure; capacity fade; power fade; cell ageing; cycle life AbstractIn application, lithium-ion pouch-format cells undergo expansion during cycling. To prevent contact loss between battery pack components and delamination and deformation during battery operation, compressive pressure is applied to cells in automotive battery modules/packs by way of rigid cell housing within the modules. In this paper, the impact of such compressive pressure on battery degradation is studied. Samples of commercial, 15 Ah LiNiMnCoO2 /Graphite electrode pouch-type cells were cycled 1200 times under atmospheric, 5psi and 15 psi compressive loads. After 1200 cycles, the capacity fade for 0, 5 and 15psi loads was11.0 %, 8.8 % and 8.4 %, respectively; the corresponding power fade was found to be 7.5 %, 39 % and 18 %, respectively, indicating power fade peaks between 0 and 15psi. This contrasting behaviour is related to the wettability increase and separator creep within the cell after compressive load is applied. The opposing capacity fade and power fade results require consideration from automotive battery engineers at the design stage of modules and packs. In addition to capacity fade and power fade results, the study identified the evolution of compressive pressures over multiple cycles, showing that pressure increases with cycling.

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Section: Discussionmentioning

confidence: 65%

Section: Impedance Raise With Cycling At Different Pressurementioning

confidence: 98%

Section: Effect Of Applying External Pressurementioning

confidence: 99%

See 1 more Smart Citation

The effect of external compressive loads on the cycle lifetime of lithium-ion pouch cells

Barai

Tangirala

Uddin

et al. 2017

Journal of Energy Storage

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show abstract

“…Lowering the viscosity and increasing the surface tension improve the wettability. For instance, it was observed that increasing the amount of EC and/or lithium salts decreases the wettability of LiCoO 2 electrodes due to poorer electrolyte spreading and penetration [Wu, 2004].…”

Section: Wettabilitymentioning

confidence: 99%

Electrolyte and Solid-Electrolyte Interphase Layer in Lithium-Ion Batteries

Chagnes¹,

Światowska²

2012

Lithium Ion Batteries - New Developments

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“…They also testified to a slight improvement of performance of LiCoO 2 electrode under compression. The theory of performance increase of LiCoO 2 electrode is also investigated on individual electrode in a later study by MaoSung et al [7]. An explanation was given on the root cause of performance increase, as applying 0.08 bar pressure increases the electrode-electrolyte interface.…”

Section: Introductionmentioning

confidence: 99%