Overcoming binder limitations of sheet-type solid-state cathodes using a solvent-free dry-film approach

Hippauf, Felix; Schumm, Benjamin; Doerfler, Susanne; Althues, Holger; Fujiki, Satoshi; Shiratsuchi, Tomoyuki; Tsujimura, Tomoyuki; Aihara, Yûichi; Kaskel, Stefan

doi:10.1016/j.ensm.2019.05.033

Cited by 186 publications

(206 citation statements)

References 39 publications

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“…To fabricate a free‐standing and flexible dry‐film, the above prepared powder electrode was mixed with 0.3 wt% of polytetrafluoroethylene (PTFE, emulsion polymerized fine powder; particle size 300–700 µm; softening point 320–330 °C; molecular weight 10 7 –10 8 g mol −1 ) in a mortar at 100 °C. [ 45 ] After 1 min of mixing and shearing, a single flake was formed. The flake was placed on a hot plate and rolled out to the desired thickness (≈100 µm).…”

Section: Methodsmentioning

confidence: 99%

Enabling High‐Energy Solid‐State Batteries with Stable Anode Interphase by the Use of Columnar Silicon Anodes

Cangaz

Hippauf

Reuter

et al. 2020

Advanced Energy Materials

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155

140

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All‐solid‐state batteries (ASSBs) with silicon anodes are promising candidates to overcome energy limitations of conventional lithium‐ion batteries. However, silicon undergoes severe volume changes during cycling leading to rapid degradation. In this study, a columnar silicon anode (col‐Si) fabricated by a scalable physical vapor deposition process (PVD) is integrated in all‐solid‐state batteries based on argyrodite‐type electrolyte (Li6PS5Cl, 3 mS cm−1) and Ni‐rich layered oxide cathodes (LiNi0.9Co0.05Mn0.05O2, NCM) with a high specific capacity (210 mAh g−1). The column structure exhibits a 1D breathing mechanism similar to lithium, which preserves the interface toward the electrolyte. Stable cycling is demonstrated for more than 100 cycles with a high coulombic efficiency (CE) of 99.7–99.9% in full cells with industrially relevant areal loadings of 3.5 mAh cm−2, which is the highest value reported so far for ASSB full cells with silicon anodes. Impedance spectroscopy revealed that anode resistance is drastically reduced after first lithiation, which allows high charging currents of 0.9 mA cm−2 at room temperature without the occurrence of dendrites and short circuits. Finally, in‐operando monitoring of pouch cells gave valuable insights into the breathing behavior of the solid‐state cell.

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Section: Methodsmentioning

confidence: 99%

Enabling High‐Energy Solid‐State Batteries with Stable Anode Interphase by the Use of Columnar Silicon Anodes

Cangaz

Hippauf

Reuter

et al. 2020

Advanced Energy Materials

Self Cite

155

140

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“…All-solid-state lithium-ion batteries are potential candidates for overcoming the safety and energy limitations of common lithium-ion batteries [111]. Replacing the liquid electrolyte with a solid one provides substantially improved safety.…”

Section: Discussionmentioning

confidence: 99%

Free-Form and Deformable Energy Storage as a Forerunner to Next-Generation Smart Electronics

et al. 2020

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Planar and rigid conventional electronics are intrinsically incompatible with curvilinear and deformable devices. The recent development of organic and inorganic flexible and stretchable electronics enables the production of various applications, such as soft robots, flexible displays, wearable electronics, electronic skins, bendable phones, and implantable medical devices. To power these devices, persistent efforts have thus been expended to develop a flexible energy storage system that can be ideally deformed while maintaining its electrochemical performance. In this review, the enabling technologies of the electrochemical and mechanical performances of flexible devices are summarized. The investigations demonstrate the improvement of electrochemical performance via the adoption of new materials and alternative reactions. Moreover, the strategies used to develop novel materials and distinct design configurations are introduced in the following sections.

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“…Hence, a solvent free approach was proposed . Other solvent free manufacturing techniques were reported …”

Section: Methodsmentioning

confidence: 99%

“…[9] Other solvent free manufacturing techniques were reported. [10][11][12][13] Graphite is widely used as an active material for lithium ion anodes. [14] Several materials are competing as cathode materials, e. g., lithium cobalt oxide (LCO), lithium iron phosphate (LFP), lithium nickel manganese oxide (NMC) or lithium nickel cobalt aluminum oxide (NCA).…”

mentioning

confidence: 99%

High Energy Li‐Ion Electrodes Prepared via a Solventless Melt Process

Astafyeva¹,

Dousset²,

Bureau³

et al. 2020

Batteries & Supercaps

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High areal density and high energy Li‐ion electrodes were prepared using a high throughput green, solventless and inexpensive melt process leading to electrodes of controlled porosity. Melt formulations were developed for NCA cathodes and graphite anodes. The formulations were based on commercially available and inexpensive elastomeric or thermoplastic binders, conventional conducting fillers and >90 wt% electrode active materials. A large range of loadings could be achieved, from 4 to 40 mg cm−2 single side. Electrochemical performances in half cells (coin cells) are reported. High capacity and cyclability for high loadings of NCA cathodes and graphite anodes were demonstrated. Areal capacities over 5 mAh.cm−2 in coin cells were obtained at a C/5 rate. Cycling at high rates, up to 5 C was demonstrated.

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Overcoming binder limitations of sheet-type solid-state cathodes using a solvent-free dry-film approach

Cited by 186 publications

References 39 publications

Enabling High‐Energy Solid‐State Batteries with Stable Anode Interphase by the Use of Columnar Silicon Anodes

Enabling High‐Energy Solid‐State Batteries with Stable Anode Interphase by the Use of Columnar Silicon Anodes

Free-Form and Deformable Energy Storage as a Forerunner to Next-Generation Smart Electronics

High Energy Li‐Ion Electrodes Prepared via a Solventless Melt Process

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