A 5 V-class cobalt-free battery cathode with high loading enabled by dry coating

Chouchane, Mehdi; Li, Weikang; Bai, Shuang; Liu, Zhao; Li, Letian; Chen, Alexander X.; Sayahpour, Baharak; Shimizu, Ryosuke; Raghavendran, Ganesh; Schroeder, Marshall A.; Chen, Yuting; Tan, Darren H. S.; Sreenarayanan, Bhagath; Waters, Crystal K.; Sichler, Allison; Gould, Benjamin; Kountz, Dennis J.; Lipomi, Darren J.; Zhang, Minghao; Meng, Ying Shirley

doi:10.1039/d2ee03840d

Cited by 83 publications

(46 citation statements)

References 46 publications

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“…Thereby, the HRXPS analyses of the transition metal species confirm that the LiClO 4 -based electrolyte leads to a thinner CEI layer than the LiPF 6 -based electrolyte does. It is interesting to note that some very recent studies have indicated that the property of the CEI layers formed on DPEs and conventional electrodes is different, and DPEs indeed exhibit better electrochemical performance than conventional electrodes do. ,, …”

Section: Resultsmentioning

confidence: 99%

“…It is interesting to note that some very recent studies have indicated that the property of the CEI layers formed on DPEs and conventional electrodes is different, and DPEs indeed exhibit better electrochemical performance than conventional electrodes do. 16,18,60 In view of the aforementioned analyses, the impact of the electrolytes on the high-loading PTFE-based DPEs can be ascribed to the following two aspects. (1) Electrolytes with different properties play a significant role in the electrochemical performance, especially ionic conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…This in turn means the LIB electrode manufacturing no longer requires a coater, enabling the reduction of ∼46% in energy consumption and ∼20% in LIB manufacturing cost. 18 This DP approach has been applied in LIB manufacturing, 19 though little research exists on the impact of the electrolyte and the chemistry of the electrolyte passivation layer on the dry-processed electrodes (DPEs). Additionally, although the PTFE binder with excellent fibrilization property ensures the excellent mechanical performance of DPEs, issues relating to the PTFE in the graphite-based anodes have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…With the avoidance of the solvent, this DP strategy successfully eliminates the need for removal and recovery of the solvent and the associated binder migration issues. This in turn means the LIB electrode manufacturing no longer requires a coater, enabling the reduction of ∼46% in energy consumption and ∼20% in LIB manufacturing cost . This DP approach has been applied in LIB manufacturing, though little research exists on the impact of the electrolyte and the chemistry of the electrolyte passivation layer on the dry-processed electrodes (DPEs).…”

Section: Introductionmentioning

confidence: 99%

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Insights into the Chemistry of the Cathodic Electrolyte Interphase for PTFE-Based Dry-Processed Cathodes

Tao,

Tan,

Meyer III

et al. 2023

ACS Appl. Mater. Interfaces

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Dry processing is a promising method for high-performance and low-cost lithium-ion battery manufacturing which uses polytetrafluoroethylene (PTFE) as a binder. However, the electrochemical stability of the PTFE binder in the cathodes and the generated chemistry of the cathode electrolyte interphase (CEI) layers are rarely reported. Herein, the CEI properties and PTFE electrochemical stability are studied via cycling the high-loading dry-processed electrodes in electrolytes with LiPF6 or LiClO4 salt. Using LiClO4 salt can eliminate other possible F sources, allowing the decomposition of PTFE to be studied. The detection of LiF in cells with the LiClO4 salt confirms that PTFE undergoes side reaction(s) in the cathodes. When compared with LiClO4, the CEI layer is much thicker when LiPF6 is used as the electrolyte salt. These results provide insights into the CEI layer and may potentially enlighten the development of binders and electrolytes for the high efficiency and long durability of DP-based LIBs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Insights into the Chemistry of the Cathodic Electrolyte Interphase for PTFE-Based Dry-Processed Cathodes

Tao,

Tan,

Meyer III

et al. 2023

ACS Appl. Mater. Interfaces

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“…Currently, the large-scale manufacturing of solid-state batteries lacks a widely reported method [10,11]. Polymer binders are typically employed in the manufacturing process, which can be categorized as either slurry cast wet or solventfree dry processes [12][13][14]. The dominant electrode manufacturing technology is wet process which involves using organic solvent to create a slurry of active materials, conductive carbon and a soluble polymer binder [15,16].…”

Section: Introductionmentioning

confidence: 99%

Impact of fabrication methods on binder distribution and charge transport in composite cathodes of all-solid-state batteries

Emley,

Wu,

Zhao

et al. 2023

Mater. Futures

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The manufacturing process of all-solid-state batteries necessitates the use of polymer binders. However, these binders, being ionic insulators by nature, can adversely affect charge transport within composite cathodes, thereby impacting the rate performance of the batteries. In this work, we aim to investigate the impact of fabrication methods, specifically the solvent-free dry process versus the slurry-cast wet process, on binder distribution and charge transport in composite cathodes of solid-state batteries. In the dry process, the binder forms a fibrous network, while the wet process results in binder coverage on the surface of cathode active materials. The difference in microstructure leads to a notable 20-fold increase in ionic conductivity in the dry-processed cathode. Consequently, the cells processed via the dry method exhibit higher capacity retention of 89% and 83% at C/3 and C/2 rates, respectively, in comparison to 68% and 58% for the wet-processed cells at the same rate. These findings provide valuable insights into the influence of fabrication methods on binder distribution and charge transport, contributing to a better understanding of the binder’s role in manufacturing of all-solid-state batteries.

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Demarcating the Impact of Electrolytes on High‐Nickel Cathodes and Lithium‐Metal Anode

Vanaphuti,

Cui,

Manthiram

2023

Adv Funct Materials

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The ever‐growing demand for low‐cost, high‐energy‐density lithium‐ion batteries (LIBs) makes high‐nickel layered oxide cathodes, especially LiNiO2 (LNO), one of the most appealing candidates. However, poor structural and surface instability that leads to a short cycle life remains a formidable challenge. Herein, a systematic investigation of LNO performance in two different electrolytes (a conventional carbonate‐based LP57 electrolyte and an ether‐based localized high‐concentration electrolyte (LHCE)) with different charge cut‐off voltages is presented. These findings show that the cathode‐electrolyte reactivity is the main factor dictating the performance degradation of LNO at high voltages rather than bulk integrity. While LHCE can provide good stability beyond 4.2 V with a robust, uniform solid–electrolyte interphase (SEI) layer on the Li‐metal anode, there is no significant difference in cyclability at 4.15 V (96% capacity retention after 200 cycles) for both LP57 and LHCE. From LNO symmetric cells, carbonate‐based electrolyte is found to be good for LNO stability while ether‐based electrolyte is beneficial toward Li‐metal anode. Thus, a suitable electrolyte or a low cut‐off voltage is necessary to maintain a decent cycle life. Altogether, this work highlights the impact of electrolyte and cut‐off voltage on LNO and Li‐metal, which can help guide the development of cells based on LNO.

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A 5 V-class cobalt-free battery cathode with high loading enabled by dry coating

Abstract: Transitioning toward more sustainable materials and manufacturing methods will be critical to continue supporting the rapidly expanding market for lithium-ion batteries. Meanwhile, energy storage applications are demanding higher power and...

Cited by 83 publications

References 46 publications

Insights into the Chemistry of the Cathodic Electrolyte Interphase for PTFE-Based Dry-Processed Cathodes

Insights into the Chemistry of the Cathodic Electrolyte Interphase for PTFE-Based Dry-Processed Cathodes

Impact of fabrication methods on binder distribution and charge transport in composite cathodes of all-solid-state batteries

Demarcating the Impact of Electrolytes on High‐Nickel Cathodes and Lithium‐Metal Anode

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