Styrene-butadiene rubber patterned current collector for improved Li-ion kinetics of the anode for high energy density lithium-ion batteries

Park, Keemin; Yoo, Hongki; Jung, Yu Jin; Ryu, Myeungwoo; Myeong, Seungcheol; Lee, Dong‐Soo; Kim, Soochan; Kim, Chanho; Kim, Jeongheon; Kwon, Jiseok; Lee, Kangchun; Cho, Chae-Woong; Paik, Ungyu; Song, Taeseup

doi:10.1016/j.jpowsour.2023.233238

Cited by 5 publications

(1 citation statement)

References 37 publications

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“…The uniform distribution of the binder throughout the electrode is a critical factor in reducing the electrode resistance. [30,31] As briefly mentioned before, the wet process involves a solvent evaporation step that can lead to binder migration; this results in the nonuniform distribution of the PVDF binder and poor electrochemical properties. In contrast, the dry process does not involve a solvent evaporation step and results in the uniform distribution of the PTFE binder and enhances the electrochemical properties of the electrode.…”

Section: Resultsmentioning

confidence: 99%

Low‐Resistance LiFePO₄ Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

Kwon,

Kim,

Han

et al. 2024

Small Science

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LiFePO4 emerges as a viable alternative to cobalt‐containing cathodes, such as Li[Ni1–x–yMnxCoy]O2 and Li[Ni1−x−yCoxAly]O2. As Fe is abundant in nature, LiFePO4 is a low‐cost material. Moreover, stable structure of LiFePO4 imparts long service life and thermal stability. However, the practical implementation of LiFePO4 cathode in energy storage devices is impeded by its low energy density and high ionic/electrical resistance. Herein, the LiFePO4 electrode with high active material loading and low ionic/electrical resistance through the dry process is reported for the first time. The dry process not only enables the uniform distribution of the polymeric binders and conductive additives within the thick electrode but also inhibits the formation of cracks. Furthermore, the bridge‐like connection of polytetrafluoroethylene facilitates the insertion and extraction of Li ions to the LiFePO4 crystal. Hence, the dry‐processed LiFePO4 electrode with high areal capacity (7.8 mAh cm−2) exhibits excellent cycle stability over 300 cycles in full‐cell operation. In addition, it is demonstrated that the estimated energy density of prismatic cell with the dry‐processed LiFePO4 electrode is competitive with state‐of‐the‐art Li[Ni1–x–yMnxCoy]O2‐based battery.

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Section: Resultsmentioning

confidence: 99%

Low‐Resistance LiFePO₄ Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

Kwon,

Kim,

Han

et al. 2024

Small Science

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10 mAh cm⁻² Cathode by Roll‐to‐Roll Process for Low Cost and High Energy Density Li‐Ion Batteries

Kim,

Park,

Kim

et al. 2024

Advanced Energy Materials

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Roll‐to‐roll dry processing enables the manufacture of high energy density and low cost Li‐ion batteries (LIBs). However, as the thickness of the electrode fabricated by dry processing becomes greater (≥10 mAh cm−2), Li‐ion migration resistance (Rion) and charge‐transfer resistance (Rct) in the electrode dramatically increase due to long diffusion lengths for Li‐ion and electron. Therefore, it is important to reduce diffusion lengths in the electrode to achieve high energy density LIBs. The dry electrode with a high areal capacity of 10 mAh cm−2 and low resistance can be achieved by following three characteristics. First, the fibrillization behavior of polytetrafluoroethylene (PTFE) binder is controlled by adjusting the processing temperature during the fibrillization process, which enables uniform distribution of PTFE binder and carbon black (CB). Second, pore size/distribution and conducting network are engineered by multi‐dimensional conducting agents, enhancing Li‐ions and electrons transport in the electrode. Finally, the structural integrity of LiNi0.80Co0.15Al0.05O2 (NCA) particles is improved without fractures, which enables uniform pore distribution in the electrode by controlling the calendering step. The prepared 10 mAh cm−2 dry electrode with homogeneous microstructure shows reduced Rion and Rct due to short diffusion lengths, which improves electrochemical performances in LIBs with a high volumetric energy density of ≈710 Wh L−1.

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Mitigation of Binder Migration Behavior during the Drying Process by Applying an Electric Field for Fast‐Charging in Lithium‐Ion Batteries

Park

Ryu

Jung

et al. 2023

Batteries & Supercaps

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The binder migration due to the capillary force‐driven solvent evaporation during the drying process in the electrode manufacturing process induces inhomogeneous binder distribution in the electrode, which deteriorates Li‐ion kinetics and corresponding poor fast‐charging properties in lithium‐ion batteries (LIBs). Here, we report an effective strategy to mitigate the binder migration behavior by applying an electric field during the drying process. As the employed carboxymethyl cellulose (CMC) and styrene‐butadiene rubber (SBR) binders have a negative charge in an aqueous anode slurry system (pH 7), the binder migration behavior could be mitigated by generating an electrical attraction force into the bottom direction by positive electrification of the current collector. The anode prepared with electric field exhibits homogeneous binder distribution in the longitudinal direction, which enhances Li‐ion kinetics, corresponding constant current charging capacity, and cycling stability compared to those of the anode prepared without electric field.

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Styrene-butadiene rubber patterned current collector for improved Li-ion kinetics of the anode for high energy density lithium-ion batteries

Cited by 5 publications

References 37 publications

Low‐Resistance LiFePO₄ Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

Low‐Resistance LiFePO₄ Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

10 mAh cm⁻² Cathode by Roll‐to‐Roll Process for Low Cost and High Energy Density Li‐Ion Batteries

Mitigation of Binder Migration Behavior during the Drying Process by Applying an Electric Field for Fast‐Charging in Lithium‐Ion Batteries

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Styrene-butadiene rubber patterned current collector for improved Li-ion kinetics of the anode for high energy density lithium-ion batteries

Cited by 5 publications

References 37 publications

Low‐Resistance LiFePO4 Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

Low‐Resistance LiFePO4 Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

10 mAh cm−2 Cathode by Roll‐to‐Roll Process for Low Cost and High Energy Density Li‐Ion Batteries

Mitigation of Binder Migration Behavior during the Drying Process by Applying an Electric Field for Fast‐Charging in Lithium‐Ion Batteries

Contact Info

Product

Resources

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Low‐Resistance LiFePO₄ Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

Low‐Resistance LiFePO₄ Thick Film Electrode Processed with Dry Electrode Technology for High‐Energy‐Density Lithium‐Ion Batteries

10 mAh cm⁻² Cathode by Roll‐to‐Roll Process for Low Cost and High Energy Density Li‐Ion Batteries