Exposing {010} Active Facets by Multiple‐Layer Oriented Stacking Nanosheets for High‐Performance Capacitive Sodium‐Ion Oxide Cathode

Xiao, Yao; Wang, Peng Fei; Yin, Ya‐Xia; Zhu, Yanfang; Niu, Yubin; Zhang, Xudong; Zhang, Jie-Nan; Yu, Xiqian; Guo, Xiaodong; Zhong, Benhe; Guo, Yu‐Guo

doi:10.1002/adma.201803765

Cited by 159 publications

(98 citation statements)

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“…In addition, the multiple pairs of redox peaks below 3.0 V can be attributed to involved ordering of sodium ions when combined with ex situ XRD results shown below . The charge/discharge profiles of NNMO‐FHP cathode at a current density of 20 mA g −1 are smooth (Figure B), implying the restrained phase transformations . It should be noted that the NNMO‐FHP cathode shows deficient phase with discharge capacity higher than charge capacity in the initial cycle, which could be ascribed to the dominant Mn 4+ /Mn 3+ redox contribution below 3.0 V according to the CV results.…”

Section: Methodsmentioning

confidence: 79%

Electrochemical Performance Optimization of Layered P2‐Type Na_0.67MnO₂ through Simultaneous Mn‐Site Doping and Nanostructure Engineering

Peng

Sun

Jiao

et al. 2019

Batteries & Supercaps

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Sodium-ion batteries are considered as the most promising candidates for grid-level energy storage applications due to its unique features of much lower cost and comparable energy density to lithium ion batteries. However, searching for suitable cathode materials with high capacity and good cycling stability are still the bottleneck issues due to the involved unmanageable phase transitions and difficult morphology control. Herein, unique fullerene-like hollow polyhedrons of P2-type Na 0.67 Ni 0.15 Mn 0.85 O 2 cathode were successfully synthesized via a facile and scalable self-template strategy, where largely enhanced electrochemical properties can be achieved compared to its bulk counterpart. It can deliver a high specific capacity of 101 mAh g À 1 after 120 cycles at a rate of 100 mA g À 1 , reaching an excellent capacity retention of 96.8 %. The possible origins of the enhanced performance were further analyzed to be the synergistic effect of hollow interior and novel morphology of the polyhedron, leading to well exposed (002) planes, shorter diffusion path and better structural robust. Importantly, the full battery without pre-sodiation treatment could deliver a high energy density of 133.1 Wh kg À 1 based on the total mass of cathode and anode, which sheds a new light for designing high energy density sodium-ion full batteries.

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Section: Methodsmentioning

confidence: 79%

Electrochemical Performance Optimization of Layered P2‐Type Na_0.67MnO₂ through Simultaneous Mn‐Site Doping and Nanostructure Engineering

Peng

Sun

Jiao

et al. 2019

Batteries & Supercaps

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show abstract

“…The sample has a nanoflake structure (Figure 1 b, c, and Figure S2), which could contribute to promoting the contact between the active material and the electrolyte. [9] Furthermore, the structural, chemical, and electronic characteristics of the layered P2@P3 and spinel structure were investigated by selected-area electron diffraction (SAED; Figure S3) and advanced spher-ical aberration-corrected scanning transmission electron microscopy (STEM) combined with high-angle annular dark field (HAADF) and annular bright field (ABF) imaging. The HAADF and ABF images clearly demonstrate that the obtained LLS-NaNCMM cathode material exhibits three distinct crystal and atomic arrangements (Figure 1 d-k and Figure S4), which correspond to the cation stacking of the P2, P3, and spinel phases, respectively.…”

mentioning

confidence: 99%

Manipulating Layered P2@P3 Integrated Spinel Structure Evolution for High‐Performance Sodium‐Ion Batteries

et al. 2020

Self Cite

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Structural evolution of the cathode during cycling plays a vital role in the electrochemical performance of sodium-ion batteries. A strategy based on engineering the crystal structure coupled with chemical substitution led to the design of the layered P2@P3 integrated spinel oxide cathode Na 0.5 Ni 0.1 Co 0.15 Mn 0.65 Mg 0.1 O 2 , which shows excellent sodiumion half/full battery performance. Combined analyses involving scanning transmission electron microscopy with atomic resolution as well as in situ synchrotron-based X-ray absorption spectra and in situ synchrotron-based X-ray diffraction patterns led to visualization of the inherent layered P2@P3 integrated spinel structure, charge compensation mechanism, structural evolution, and phase transition. This study provides an in-depth understanding of the structure-performance relationship in this structure and opens up a novel field based on manipulating structural evolution for the design of highperformance battery cathodes. Theever-increasingdemandforsustainableenergyresourceshas driven the development of large-scale electrochemical energy storage systems (EESs). [1] Among the various alternative EESs, room-temperature sodium-ion batteries (SIBs) have drawn considerable attention because of their similar electrochemical storage mechanism to lithium-ion batteries as well as the natural abundance of sodium. [2] Layered transition metal oxide cathodes for SIBs have aroused much interest over recent years because of their large specific capacity, high ionic conductivity, environmental benignity, and feasible synthesis. [3] Based on their Na occupation sites and the stacking sequence of the O layers, layered oxides can be classified into P2, P3, O2, and O3 structures. [4] Most oxide cathodes which display a single crystalline structure, however, show limited electrochemical performance. [5] Recently, the biphase synergy of P2-Tunnel and P2-P3 phases in layered transition metal cathode materials was utilized to combine the merits of different structures, [6] noting that the spinel phase in the cathode material could provide high electronic conductivity to coordinate in a timely manner with the Na + deintercalation/ intercalation. [7] In addition, chemical substitutions, such as Tisubstituted NaNi 0.5 Mn 0.2 Ti 0.3 O 2 as well as Cu and Mg cosubstituted Na 2/3 Ni 1/6 Mn 2/3 Cu 1/9 Mg 1/18 O 2 cathode materials, could maintain structural stability by suppressing unfavorable multiphase transformations and relieving the Jahn-Teller distortion. [8] An optimal strategy based on the idea of combining the bifunctional advantages of the triphase composite structure and chemical element substitution was proposed in this case. Deciphering the underlying reaction mechanism is also of great importance to provide significant guidelines for precisely designing battery materials.Herein, we have designed a stable layered P2@P3 integrated spinel Na 0.5 Ni 0.1 Co 0.15 Mn 0.65 Mg 0.1 O 2 cathode material through a strategy involving engineering of its crystal structure and element...

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“…The electrode materials used in this report included Na 3 V 2 (PO 4 ) 3 , Na(Li 0.05 Ni 0.3 Mn 0.5 Cu 0.1 Mg 0.05 )O 2 , and NaTi 2 (PO 4 ) 3 , and were prepared according to the methods reported in related literature, [18][19][20] and hard carbon anode coated material were obtained from a commercial channel (KUREHA Corporation, Chuo-ku, Tokyo, Japan).…”

Section: Synthesis and Source Of Electrode Materialsmentioning

confidence: 99%

In Situ Copolymerizated Gel Polymer Electrolyte with Cross-Linked Network for Sodium-Ion Batteries

et al. 2020

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High thermal stability, nonflammability, and no liquid leakage are indispensable capabilities for electrolytes in sodium-ion batteries toward large-scale energy storage systems. The use of solid-state or gel polymer electrolytes has proven to be one of the enabling tools to bring about these advancements; however, their application suffer from tedious synthesis procedure and/or low ionic transport to ensure a battery operation. Herein, a novel gel polymer electrolyte with a cross-linked polyether network (GPE-CPN) was crafted through a self-catalyzed strategy, where in situ copolymerization of two monomers, 1,3-dioxolane and trimethylolpropane triglycidyl ether is realized successfully, with the use of sodium hexafluorophosphate (NaPF 6 ) as an initiator, at room temperature. We demonstrate that the resultant GPE-CPN possesses a superior electrochemical stability window up to 4 V versus Na + /Na, a considerable ionic conductivity, of 8.2 × 10 −4 S cm −1 at room temperature, which is a capability good enough to suppress the growth of sodium dendrites and thus, stabilize the interface of electrolyte/ sodium anode. Considering the benefit from its facile fabrication and superior characteristics, the asgenerated GPE-CPN reveals a potential application for future rechargeable sodium batteries.

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Exposing {010} Active Facets by Multiple‐Layer Oriented Stacking Nanosheets for High‐Performance Capacitive Sodium‐Ion Oxide Cathode

Cited by 159 publications

References 50 publications

Electrochemical Performance Optimization of Layered P2‐Type Na_0.67MnO₂ through Simultaneous Mn‐Site Doping and Nanostructure Engineering

Electrochemical Performance Optimization of Layered P2‐Type Na_0.67MnO₂ through Simultaneous Mn‐Site Doping and Nanostructure Engineering

Manipulating Layered P2@P3 Integrated Spinel Structure Evolution for High‐Performance Sodium‐Ion Batteries

In Situ Copolymerizated Gel Polymer Electrolyte with Cross-Linked Network for Sodium-Ion Batteries

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Exposing {010} Active Facets by Multiple‐Layer Oriented Stacking Nanosheets for High‐Performance Capacitive Sodium‐Ion Oxide Cathode

Cited by 159 publications

References 50 publications

Electrochemical Performance Optimization of Layered P2‐Type Na0.67MnO2 through Simultaneous Mn‐Site Doping and Nanostructure Engineering

Electrochemical Performance Optimization of Layered P2‐Type Na0.67MnO2 through Simultaneous Mn‐Site Doping and Nanostructure Engineering

Manipulating Layered P2@P3 Integrated Spinel Structure Evolution for High‐Performance Sodium‐Ion Batteries

In Situ Copolymerizated Gel Polymer Electrolyte with Cross-Linked Network for Sodium-Ion Batteries

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Product

Resources

About

Electrochemical Performance Optimization of Layered P2‐Type Na_0.67MnO₂ through Simultaneous Mn‐Site Doping and Nanostructure Engineering

Electrochemical Performance Optimization of Layered P2‐Type Na_0.67MnO₂ through Simultaneous Mn‐Site Doping and Nanostructure Engineering