<i>In situ</i> growth of polyimide nanoarrays on conductive carbon supports for high-rate charge storage and long-lived metal-free cathodes

“…Furthermore, a composite anode was combined with an AC cathode in 1 M LiPF 6 to construct a 4V full-cell device, which delivers an energy density of 113.8 W h kg –1 at 180.8 W kg –1 and 59.2 W h kg –1 at 9063.4 W kg –1 , respectively, and retains nearly 80% of the initial capacitance over 2000 cycles at 5 A g –1 . Remarkably, such LICs showcase an excellent energy–power–lifespan combination, extremely superior to their counterparts of ASSC and SSC devices due to synergistic effects of the extended operating voltage and the improved redox kinetics by chain engineering of PQs and highly conductive graphene …”

Section: Introductionmentioning

confidence: 99%

“…Remarkably, such LICs showcase an excellent energy−power−lifespan combination, extremely superior to their counterparts of ASSC and SSC devices due to synergistic effects of the extended operating voltage and the improved redox kinetics by chain engineering of PQs and highly conductive graphene. 30…”

Section: Introductionmentioning

confidence: 99%

Macromolecular Engineering of Polyquinone-Based Electrode Materials for High-Energy Supercapacitors

Dou

Dong

et al. 2022

ACS Appl. Energy Mater.

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Rational engineering of electrode materials and device configurations are significantly pivotal to develop high-energy supercapacitors without sacrificing strong power capability and long lifespan. Herein, a Schiff-base condensation between phthalaldehydes and anthraquinones was readily performed to yield chain-engineered polyquinones (PQs) with tailored redox-active multi-hydroxyl groups. Further in situ incorporation of conductive graphene into PQs produced the composites. The symmetric supercapacitor (SSC) based on two identical composite electrodes delivers an energy density of 9.3 W h kg–1 at a power density of 99.9 W kg–1 and 6.2 W h kg–1 at 4000.0 W kg–1, respectively, outperforming the pure PQ-based SSC (9.2 W h kg–1 at 150.2 W kg–1 and 3.2 W h kg–1 at 1515.8 W kg–1). Furthermore, the graphene/PQ composite coupled with a counter electrode of activated carbon (AC) was actualized to assemble an asymmetric supercapacitor (ASSC), which enables higher power and energy outputs (20.3 W h kg–1 at 350.2 W kg–1 and 10.3 W h kg–1 at 6980.2 W kg–1) compared to the SSC device. Finally, a lithium-ion capacitor (LIC) was constructed using a composite anode and an AC cathode. Remarkably, such a full-cell delivers an energy density up to 113.8 W h kg–1 at 180.8 W kg–1 and retains 59.2 W h kg–1 at 9063.4 W kg–1, much higher than its counterparts of ASSC, SSC, and many supercapacitors reported previously. This LIC also exhibits a nearly 80% of initial capacitance after running at 5 A g–1 over 2000 cycles, showcasing an excellent energy–power–lifespan combination.

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“…[1] In response to this situation, electrochemical energy technologies particularly for rechargeable lithium-ion batteries (LIBs) have received major attention and successfully predominated portable electronics over the past decades. [2][3][4] Against the backdrop of the fast-emerging electric vehicles (EVs) in recent years, commercial LIBs cannot longer fulfil the practical demand due to their limited energy density less than 260 Wh kg −1 . [5] The main bottleneck is the capacity limitation of intercalationtype cathode materials such as LiFePO 4 and LiCoO 2 .…”

Section: Introductionmentioning

confidence: 99%

Polymers in Lithium–Sulfur Batteries

et al. 2021

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Lithium–sulfur batteries (LSBs) hold great promise as one of the next‐generation power supplies for portable electronics and electric vehicles due to their ultrahigh energy density, cost effectiveness, and environmental benignity. However, their practical application has been impeded owing to the electronic insulation of sulfur and its intermediates, serious shuttle effect, large volume variation, and uncontrollable formation of lithium dendrites. Over the past decades, many pioneering strategies have been developed to address these issues via improving electrodes, electrolytes, separators and binders. Remarkably, polymers can be readily applied to all these aspects due to their structural designability, functional versatility, superior chemical stability and processability. Moreover, their lightweight and rich resource characteristics enable the production of LSBs with high‐volume energy density at low cost. Surprisingly, there have been few reviews on development of polymers in LSBs. Herein, breakthroughs and future perspectives of emerging polymers in LSBs are scrutinized. Significant attention is centered on recent implementation of polymers in each component of LSBs with an emphasis on intrinsic mechanisms underlying their specific functions. The review offers a comprehensive overview of state‐of‐the‐art polymers for LSBs, provides in‐depth insights into addressing key challenges, and affords important resources for researchers working on electrochemical energy systems.

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In situ growth of polyimide nanoarrays on conductive carbon supports for high-rate charge storage and long-lived metal-free cathodes

Abstract: Redox-active carbonyl polymers have been intensively explored as promising high-capacity cathode alternatives to traditional inorganic materials for metal-ion batteries. Despite inspiring achievements, practical implementation is severely restricted by their poor...

Cited by 22 publications

References 77 publications

Enhanced stability of vanadium-doped Li_1.2Ni_0.16Co_0.08Mn_0.56O₂ cathode materials for superior Li-ion batteries

Enhanced stability of vanadium-doped Li_1.2Ni_0.16Co_0.08Mn_0.56O₂ cathode materials for superior Li-ion batteries

Macromolecular Engineering of Polyquinone-Based Electrode Materials for High-Energy Supercapacitors

Polymers in Lithium–Sulfur Batteries

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In situ growth of polyimide nanoarrays on conductive carbon supports for high-rate charge storage and long-lived metal-free cathodes

Abstract: Redox-active carbonyl polymers have been intensively explored as promising high-capacity cathode alternatives to traditional inorganic materials for metal-ion batteries. Despite inspiring achievements, practical implementation is severely restricted by their poor...

Cited by 22 publications

References 77 publications

Enhanced stability of vanadium-doped Li1.2Ni0.16Co0.08Mn0.56O2 cathode materials for superior Li-ion batteries

Enhanced stability of vanadium-doped Li1.2Ni0.16Co0.08Mn0.56O2 cathode materials for superior Li-ion batteries

Macromolecular Engineering of Polyquinone-Based Electrode Materials for High-Energy Supercapacitors

Polymers in Lithium–Sulfur Batteries

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Product

Resources

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Enhanced stability of vanadium-doped Li_1.2Ni_0.16Co_0.08Mn_0.56O₂ cathode materials for superior Li-ion batteries

Enhanced stability of vanadium-doped Li_1.2Ni_0.16Co_0.08Mn_0.56O₂ cathode materials for superior Li-ion batteries