Hybrid LiMn2O4–radical polymer cathodes for pulse power delivery applications

Dolphijn, Guillaume; Isikli, Süheda; Gauthy, F.; Vlad, Alexandru

doi:10.1016/j.electacta.2017.10.021

Cited by 17 publications

(24 citation statements)

References 35 publications

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“…[2,12] By hybridizing the materials, both the advantages of high output and energy density can be maintained. [27][28][29][30][31][32] A key phenomenon to achieve the synergy of the hybrid materials is the catalytic electrochemical oxidation and reduction of inorganic materials by redox-active polymers (i.e., charge mediation). [27][28][29][30][31] The rapidly responding organic polymers are charged/discharged faster than the inorganics, and the former oxidize/reduce the latter, to accelerate the overall electrode reactions.…”

Section: Resultsmentioning

confidence: 99%

“…[27][28][29][30][31][32] A key phenomenon to achieve the synergy of the hybrid materials is the catalytic electrochemical oxidation and reduction of inorganic materials by redox-active polymers (i.e., charge mediation). [27][28][29][30][31] The rapidly responding organic polymers are charged/discharged faster than the inorganics, and the former oxidize/reduce the latter, to accelerate the overall electrode reactions. [27][28][29][30][31] For instance, TEMPO-or PROXYL-substituted polymers (3.5-3.7 V) would be able to electrochemically oxidize LiFePO 4 (3.4 V) based on the potential gap of the materials (Figure 3a).…”

Section: Resultsmentioning

confidence: 99%

“…[27][28][29][30][31] The rapidly responding organic polymers are charged/discharged faster than the inorganics, and the former oxidize/reduce the latter, to accelerate the overall electrode reactions. [27][28][29][30][31] For instance, TEMPO-or PROXYL-substituted polymers (3.5-3.7 V) would be able to electrochemically oxidize LiFePO 4 (3.4 V) based on the potential gap of the materials (Figure 3a). The charge mediation was reported with several radical polymers and the metal oxidizes (e.g., LiFePO 4 and LiMn 2 O 4 ), whereas the detailed kinetics were not fully understood.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

A PROXYL‐Type Norbornene Polymer for High‐Voltage Cathodes in Lithium Batteries

Hatakeyama‐Sato

Matsumoto

Takami

et al. 2021

Macromol. Rapid Commun.

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A newly designed radical polymer with a polynorbornene backbone and unsaturated derivative of tetramethylpyrrolidine 1-oxyl (PROXYL) as pendant groups displays reversible redox at 3.75 V (vs Li/Li + ). The robust polymer design enables the high voltage while maintaining a promising cyclability (over 1000 cycles). The polymer is also beneficial as an additive to the regular lithium iron phosphate electrodes, where the quickly responding organic material facilitates the charging reactions catalytically.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A PROXYL‐Type Norbornene Polymer for High‐Voltage Cathodes in Lithium Batteries

Hatakeyama‐Sato

Matsumoto

Takami

et al. 2021

Macromol. Rapid Commun.

View full text Add to dashboard Cite

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“…Overall, this hybrid system was evidenced to provide high energy and power capacity, over-polarization protection, and fast and stable recharge over more than 1500 cycles [ 6 ]. Applying the same rationale, we next designed a system based on the coupling of PTMA with a higher voltage material, namely LiMn 2 O 4 [ 7 ]. The aim here was to obtain hybrid electrodes with enhanced power delivery characteristics, as oxidized PTMA + will be both the favored and the best rate capable redox species—hence acting as a power buffer.…”

Section: Introductionmentioning

confidence: 99%

High Power Cathodes from Poly(2,2,6,6-Tetramethyl-1-Piperidinyloxy Methacrylate)/Li(NixMnyCoz)O2 Hybrid Composites

et al. 2021

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Lithium-ion batteries are today among the most efficient devices for electrochemical energy storage. However, an improvement of their performance is required to address the challenges of modern grid management, portable technology, and electric mobility. One of the most important limitations to solve is the slow kinetics of redox reactions associated to inorganic cathodic materials, directly impacting on the charging time and the power characteristics of the cells. In sharp contrast, redox polymers such as poly(2,2,6,6-tetramethyl-1-piperidinyloxy methacrylate) (PTMA) exhibit fast redox reaction kinetics and pseudocapacitors characteristics. In this contribution, we have hybridized high energy Li(NixMnyCoz)O2 mixed oxides (NMC) with PTMA. In this hybrid cathode configuration, the higher voltage NMC (ca. 3.7 V vs. Li/Li+) is able to transfer its energy to the lower voltage PTMA (3.6 V vs. Li/Li+) improving the discharge power performances and allowing high power cathodes to be obtained. However, the NMC-PTMA hybrid cathodes show an important capacity fading. Our investigations indicate the presence of an interface degradation reaction between NMC and PTMA transforming NMC into an electrochemically dead material. Moreover, the aqueous process used here to prepare the cathode is also shown to enable the degradation of NMC. Indeed, once NMC is immersed in water, alkaline surface species dissolve, increasing the pH of the slurry, and corroding the aluminum current collector. Additionally, the NMC surface is altered due to delithiation which enables the interface degradation reaction to take place. This reaction by surface passivation of NMC particles did not succeed in preventing the interfacial degradation. Degradation was, however, notably decreased when Li(Ni0.8Mn0.1Co0.1)O2 NMC was used and even further when alumina-coated Li(Ni0.8Mn0.1Co0.1)O2 NMC was considered. For the latter at a 20C discharge rate, the hybrids presented higher power performances compared to the single constituents, clearly emphasizing the benefits of the hybrid cathode concept.

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“…One of main storage performance factors for supercapacitors is the electrode materials. The different micro or nano-structure lithium manganate materials, such as LiMn 2 O 4 , Li 2 MnO 3 , and Li 4 Mn 5 O 12 , were widely studied as an anode material, owing to their superior electrical performance [1,[6][7][8][9][10][11][12][13][14][15]. The different structure and morphology of electrode materials produce an effect on the performance of the storage device.…”

Section: Introductionmentioning

confidence: 99%

Waxberry-Like Nanosphere Li4Mn5O12 as High Performance Electrode Materials for Supercapacitors

Zhang

Wang

et al. 2018

JLPEA

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Porous materials have superior electrochemical performance owing to its their structure, which could increase the specific and contact area with the electrode. The spinel Li 4 Mn 5 O 12 has a three-dimensional tunnel structure for a better diffusion path, which has the advantage of lithium ion insertion and extraction in the framework. However, multi-space spherical materials with single morphologies are rarely studied. In this work, waxberry-like and raspberry-like nanospheres for Li 4 Mn 5 O 12 have been fabricated by the wet chemistry and solid-state methods for the first time. The diameter of a single waxberry-and raspberry-like nanosphere is about 1 µm and 600 nm, respectively. The specific capacitance of Li 4 Mn 5 O 12 was 535 mF cm −2 and 147.25 F g −1 at the scan rate of 2 mV s −1 , and the energy density was 110.7 Wh kg −1 , remaining at 70% after 5000th charge-discharge cycles. Compared with raspberry-like nanosphere Li 4 Mn 5 O 12 , the waxberry-like nanoporous spinel Li 4 Mn 5 O 12 shows the better electrochemical performance and stability; furthermore, these electrochemical performances have been improved greatly compared to the previous studies. All these results indicate that the waxberry-like nanoporous spinel Li 4 Mn 5 O 12 could provide a potential application in high performance supercapacitors.

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Hybrid LiMn2O4–radical polymer cathodes for pulse power delivery applications

Cited by 17 publications

References 35 publications

A PROXYL‐Type Norbornene Polymer for High‐Voltage Cathodes in Lithium Batteries

A PROXYL‐Type Norbornene Polymer for High‐Voltage Cathodes in Lithium Batteries

High Power Cathodes from Poly(2,2,6,6-Tetramethyl-1-Piperidinyloxy Methacrylate)/Li(NixMnyCoz)O2 Hybrid Composites

Waxberry-Like Nanosphere Li4Mn5O12 as High Performance Electrode Materials for Supercapacitors

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