Architecting robust interphase on high voltage cathodes via aromatic polyamide

Ye, Changchun; Qiu, Yongcai; Luo, Xuehuan; Chen, Min; Zhong, Yisen; Wu, Binhong; Xing, Lidan; Liao, Youhao; Li, Weishan

doi:10.1016/j.cej.2020.126366

Cited by 15 publications

(10 citation statements)

References 51 publications

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“…For NiMoO 4 NRs-NC, The Ni 2p spectrum (Figure 2a) shows two main peaks at 855.3 and 872.9 eV accompanied by two satellite peaks at 861.7 and 879.1 eV, which are typical characteristic peaks of Ni 2+ . 35,36 After quenching in 1 M Fe(NO 3 ) 3 solution, the spectrum at 855.5 eV is fitted into two pairs of peaks, corresponding to Ni 2+ and Ni 3+ , respectively. The ratio of Ni 3+ /Ni 2+ is 0.66, which is higher than that of NiMoO 4 NRs-Fe dopped (0.44, as shown in Figure S8a and Table S2).…”

Section: Resultsmentioning

confidence: 99%

Activating Metal Oxides Nanocatalysts for Electrocatalytic Water Oxidation by Quenching-Induced Near-Surface Metal Atom Functionality

et al. 2021

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Developing a reliable strategy for the modulation of the texture, composition, and electronic structure of electrocatalyst surfaces is crucial for electrocatalytic performance, yet still challenging. Herein, we develop a facile and universal strategy, quenching, to precisely tailor the surface chemistry of metal oxide nanocatalysts by rapidly cooling them in a salt solution. Taking NiMoO 4 nanocatalysts an example, we successfully produce the quenched nanocatalysts offering a greatly reduced oxygen evolution reaction (OER) overpotential by 85 mV and 135 mV at 10 mA cm −2 and 100 mA cm −2 respectively. Through detailed characterization studies, we establish that quenching induces the formation of numerous disordered stepped surfaces and the near-surface metal ions doping, thus regulating the local electronic structures and coordination environments of Ni, Mo, which promotes the formation of the dualsite active and thereby affords a low energy pathway for OER. This quenching strategy is also successfully applied to a number of other metal oxides, such as spinel-type Co 3 O 4 , Fe 2 O 3 , LaMnO 3 , and CoSnO 3 , with similar surface modifications and gains in OER activity. Our finding provides a new inspiration to activate metal oxide catalysts and extends the use of quenching chemistry in catalysis.

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Section: Resultsmentioning

confidence: 99%

Activating Metal Oxides Nanocatalysts for Electrocatalytic Water Oxidation by Quenching-Induced Near-Surface Metal Atom Functionality

et al. 2021

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“…There is a new characteristic peak at 850.4 eV, meaning that the nickel ions occupy the intermediary tetrahedral sites after delithiation. [ 20 ] The two characteristic peaks of Co2p and Mn2p entirely disappear because of the coverage of CEI on NCM cathodes (Figure S8b,c, Supporting Information), suggesting that interfaces of NCM||SPE fail to provide convenient and fast paths for Li + transport. SAED pattern (Figure S7b, Supporting Information) further verifies that the single‐crystal structure of NCM suffered serious destruction.…”

Section: Resultsmentioning

confidence: 99%

“…[ 19 ] However, these inorganic modification layers through complex and expensive processes are too rigid to resist the volume change during charging/discharging and mitigate the poor physical contact problem. [ 3a,20 ]…”

Section: Introductionmentioning

confidence: 99%

Constructing Interfacial Nanolayer Stabilizes 4.3 V High‐Voltage All‐Solid‐State Lithium Batteries with PEO‐Based Solid‐State Electrolyte

Wang

Song

Jiang

et al. 2022

Adv Funct Materials

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The complicated interfacial problems of poly(ethylene oxide) (PEO)‐based solid polymer electrolytes (SPEs) at high voltages severely hinder its practical applications for high‐energy‐density all‐solid‐state lithium batteries (ASSLBs). Herein, the failure mechanisms of ASSLBs with LiNi0.6Co0.2Mn0.2O2 (NCM)‐PEO are studied. It is found that the ASSLBs after charge generates a sharp drop of 0.62 V at the cut‐off voltage of 4.30 V, and induce a high interfacial resistance due to forming an uneven thick cathode electrolyte interface on the NCM surface, as well as cause the destruction of NCM surface structure during storage, leading to serious performance degradation. Constructing the interfacial nanolayer with aromatic polyamide (APA) on the surface of NCM active particles (NCM@APA) can mitigate interfacial side reactions between NCM and SPE. Robust interfacial nanolayers not only effectively protect the crystal structure of NCM but also provide a steady interfacial environment for Li+ diffusion kinetics. Accordingly, NCM@APA||SPE||Li ASSLBs exhibit an acceptable voltage drop of 0.27 V after 10 days storage and a substantially improved electrochemical performance with an average coulombic efficiency of 99.1% and capacity retention of 76.7% at 30 mA g−1 after 80 cycles.

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“…Polymers have high molecular modulus and high flexibility, providing the interphases with ability to buffer volume change of Li anode. Therefore, various polymers have been applied to construct protective interphases on Li anodes [60][61][62][63][64][65][66][67][68][69]. Especially, the polymers with polar groups can conduct Li + via the phys-ical interactions between the Li cation and polar groups.…”

Section: Polymer Interphasesmentioning

confidence: 99%