Improvement of Electrochemical Properties of Ni-Rich Cathode Material by Polypyrrole Coating

Yoo, Gi-Won; Jang, B.E.; Min, Song-Gi; Son, Jong‐Tae

doi:10.1166/jnn.2016.11089

Cited by 4 publications

(6 citation statements)

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“…As shown by the SEM image, PEDOT:PSS can form a uniform coating onto Si‐NPs and build a robust polymeric ETN for the Si anode. PPy is another classic conductive polymer material that has been frequently employed to fabricate core–shell AMs . Due to the good processing properties of PPy, it can enable the fabrication of core–shell nanowires as shown by Figure b, which is about a type of PPy@V 2 O 5 nanofabric reported by Mao and co‐workers .…”

Section: Controlling Etn In Composite Electrodesmentioning

confidence: 99%

“…As a result, different types of conductive polymers have been studied as summarized in Figure . These conductive polymers include PEDOT:PSS, polypyrrole (PPy), Polyaniline (PANI), etc. Different from carbon‐coating, conductive polymer coatings are believed to be more flexible in terms of mechanical properties and applicable to various electrode materials.…”

Section: Controlling Etn In Composite Electrodesmentioning

confidence: 99%

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Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Wang

Min

et al. 2018

Advanced Materials

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portable electronics, cell phones, electrical vehicles (EVs), aerospace, etc. For advanced batteries, higher and higher energy density and/or power density, long cycling stability, good device safety, and low-cost are the primary goals. Since the energy density is mainly dependent on the specific capacity and loading level of active materials (AMs), AMs usually dominate the volume and weight inside the batteries. Because of this, tremendous efforts have been focused on high-performance AMs. However, the electrochemical performance of energy storage devices (ESDs) is fundamentally determined by a collective contribution or teamwork of all the components: AMs, electrolyte, separator, conductive agent, binders, etc. More importantly, with the increasing interests on high-capacity AMs (e.g., silicon, sulfur, Li-rich cathode, etc.), it becomes very clear that the "traffic system" (i.e., the charge transport system) plays very critical roles in the performance of the high-capacity AMs. Take silicon anode for example, a durable and flexible conductive network inside the electrode composite has been vital for addressing the big volume change issue. In this case, high-performance binders and conductive agent that can generate advanced conductive network are the keys. [2] In addition, with the increasing interests on EVs and flexible electronics, building a powerful and robust charge transport system inside ESDs is an urgent and critical task to support fast charging/ discharging capability and even flexibility of ESDs. In short, with the fast development of energy storage technologies, EVs, cell phones, etc., there is a critical, urgent, and challenging task on building powerful and durable charge transport system in next-generation advanced ESDs. Charge Transport Inside ESDsThe thriving of big cities highly relies on a powerful traffic system that transports the people, foods, products, etc. Similar to this picture, ESDs are powered by the transportation of charges, including both ions and electrons. As illustrated in Figure 1a, one can analogize the charge transport system and AMs in the electrodes of ESDs to the traffic system and buildings (i.e., host system of people), respectively. This analogy example not only help to explain the relationship between The charge transport system in an energy storage device (ESD) fundamentally controls the electrochemical performance and device safety. As the skeleton of the charge transport system, the "traffic" networks connecting the active materials are primary structural factors controlling the transport of ions/electrons. However, with the development of ESDs, it becomes very critical but challenging to build traffic networks with rational structures and mechanical robustness, which can support high energy density, fast charging and discharging capability, cycle stability, safety, and even device flexibility. This is especially true for ESDs with high-capacity active materials (e.g., sulfur and silicon), which show notable volume change during cycling. Therefore, there is an ur...

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Section: Controlling Etn In Composite Electrodesmentioning

confidence: 99%

Section: Controlling Etn In Composite Electrodesmentioning

confidence: 99%

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Wang

Min

et al. 2018

Advanced Materials

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“…Coating materials with a good ionic or electronic conductivity, such as carbon,115 lithium ionic conductors (Li 3 PO 4 ,108,116 LiMn 1.9 Al 0.1 O 4 ,117 Li 3 VO 4 ,118,119 Li 2 SiO 3 ,106 Li 2 TiO 3 ,120 LiFePO 4 ,121 LiAlO 2 ,122 Li 2 ZrO 3 ,123–125 etc.) and conductive polymer (poly(ethylene glycol),126 polyacrylate,127 poly(3,4‐ethylenedioxythiophene),126 polyaniline,109,128 polypropylene,129 polypyrrole (PPy),130 etc. ), can also improve Li + ions or electron diffusion coefficient, providing a positive effect on rate performance of Ni‐rich NCM.…”

Section: Fast Charging Capability Of Ni‐rich Ncmmentioning

confidence: 99%

Ni‐Rich/Co‐Poor Layered Cathode for Automotive Li‐Ion Batteries: Promises and Challenges

Wang

Ding

Deng

et al. 2020

Advanced Energy Materials

293

218

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To pursue a higher energy density (>300 Wh kg−1 at the cell level) and a lower cost (<$125 kWh−1 expected at 2022) of Li‐ion batteries for making electric vehicles (EVs) long range and cost‐competitive with internal combustion engine vehicles, developing Ni‐rich/Co‐poor layered cathode (LiNi1−x−yCoxMnyO2, x+y ≤ 0.2) is currently one of the most promising strategies because high Ni content is beneficial to high capacity (>200 mAh g−1) while low Co content is favorable to minimize battery cost. Unfortunately, Ni‐rich cathodes suffer from limited structure stability and electrode/electrolyte interface stability in the charged state, leading to electrode degradation and poor cycling performance. To address these problems, various strategies have been employed such as doping, structural optimization design (e.g., core–shell structure, concentration‐gradient structure, etc.), and surface coating. In this review, five key aspects of Ni‐rich/Co‐poor layered cathode materials are explored: energy density, fast charge capability, service life including cycling life and calendar life, cost and element resources, and safety. This enables a comprehensive analysis of current research advances and challenges from the perspective of both academy and industry to help facilitate practical applications for EVs in the future.

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“…Considering that the collapse of the secondary particles is also the main reason for the capacity decay, polymers with both high electronic conductivity and elasticity are often chosen as the coating layer. , These polymer coatings can not only prevent the side reaction between the electrolyte and the active material at high delithiation state but also relieve the stress of the cathode material during the charge and discharge process. Polypyrrole (PPy) is such a typical conductive polymer that has been adopted as the coating layer . PPy as a cathode material for lithium batteries with wide band gap, however, has been ignored in almost all the published articles.…”

Section: Introductionmentioning

confidence: 99%

“…Polypyrrole (PPy) is such a typical conductive polymer that has been adopted as the coating layer. 33 PPy as a cathode material for lithium batteries with wide band gap, 34 however, has been ignored in almost all the published articles. Although the band gap of PPy can be reduced to some extent by anion doping and nano oxides doping, 35 the band gap of doped PPy is still larger than the 0.3 eV of the Ni-rich cathode material.…”

Section: ■ Introductionmentioning

confidence: 99%

Constructing High Conductive Composite Coating with TiN and Polypyrrole to Improve the Performance of LiNi_0.8Co_0.1Mn_0.1O₂ at High Cutoff Voltage of 4.5 V

Fan

Lin

Shi

et al. 2021

ACS Appl. Energy Mater.

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LiNi0.8Co0.1Mn0.1O2, one of the typical nickel-rich cathode materials, is considered as a candidate for next generation high energy density Lithium-ion batteries (LIBs) due to its high specific capacity and relatively low cost. But there are still some issues, such as poor cycling performance and thermal stability, to be addressed when charging the nickel-rich cathode materials for LIBs to high cutoff voltage. Therefore, we construct a multifunctional mixed conductive coating layer with polypyrrole and nano titanium nitride particles to improve the comprehensive performance of LiNi0.8Co0.1Mn0.1O2, especially the rate performance and the thermal stability. This mixed coating layer not only inhibits the side reactions at the interface of the active material but also possesses high conductivity as well as the unique elasticity that can release the stress of the cathode during cycling. Comparing with the single polypyrrole coating layer, such a mixed coating layer can ensure the comodified LiNi0.8Co0.1Mn0.1O2 maintaining 80.1% capacity retention after 450 cycles at the upper cutoff voltage of 4.5 V. Besides, it also alleviates the collapse of the secondary particles after long cycles due to its unique elasticity. Meanwhile, the titanium nitride with super high electronic conductivity greatly improves the conductivity of the comodified LiNi0.8Co0.1Mn0.1O2 so that it can still deliver a specific capacity of 102 mAh·g–1 at 20C. What’s more, the thermal stability of the comodified sample is also improved due to the good thermal conductivity and thermal stability characteristics of the titanium nitride as well as the polypyrrole layer. All the results verify that this design is an effective way to enhance the comprehensive properties of Ni-rich cathode materials.

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Improvement of Electrochemical Properties of Ni-Rich Cathode Material by Polypyrrole Coating

Cited by 4 publications

References 0 publications

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Ni‐Rich/Co‐Poor Layered Cathode for Automotive Li‐Ion Batteries: Promises and Challenges

Constructing High Conductive Composite Coating with TiN and Polypyrrole to Improve the Performance of LiNi_0.8Co_0.1Mn_0.1O₂ at High Cutoff Voltage of 4.5 V

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Improvement of Electrochemical Properties of Ni-Rich Cathode Material by Polypyrrole Coating

Cited by 4 publications

References 0 publications

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Strategies for Building Robust Traffic Networks in Advanced Energy Storage Devices: A Focus on Composite Electrodes

Ni‐Rich/Co‐Poor Layered Cathode for Automotive Li‐Ion Batteries: Promises and Challenges

Constructing High Conductive Composite Coating with TiN and Polypyrrole to Improve the Performance of LiNi0.8Co0.1Mn0.1O2 at High Cutoff Voltage of 4.5 V

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Constructing High Conductive Composite Coating with TiN and Polypyrrole to Improve the Performance of LiNi_0.8Co_0.1Mn_0.1O₂ at High Cutoff Voltage of 4.5 V