Mn 2+插层V2C MXene应用于钠离子电池的研究

doi:10.15541/jim20190270

无机材料学报 ›› 2020, Vol. 35 ›› Issue (1): 139-144.DOI: 10.15541/jim20190270

所属专题： MAX相和MXene材料；离子电池材料； 2020年能源材料论文精选(一) :金属离子电池&燃料电池； MXene材料专辑(2020~2021)；【虚拟专辑】锂金属电池,钠离子电池和水系电池(2020~2021)

• 研究快报 • 上一篇

Mn ²⁺插层V₂C MXene应用于钠离子电池的研究

魏世强,王昌达,张鹏军,朱可夫,陈双明(),宋礼

中国科学技术大学中国科学院纳米科学卓越中心, 国家同步辐射实验室, 合肥 230029

收稿日期:2019-06-03 出版日期:2020-01-20 网络出版日期:2019-09-20
作者简介:魏世强(1994–), 男, 硕士研究生. E-mail: sqw@mail.ustc.edu.cn

Mn ²⁺ Intercalated V₂C MXene for Enhanced Sodium Ion Battery

WEI Shi-Qiang,WANG Chang-Da,ZHANG Peng-Jun,ZHU Ke-Fu,CHEN Shuang-Ming(),SONG Li

National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei 230029, China

Received:2019-06-03 Published:2020-01-20 Online:2019-09-20
About author:WEI Shi-Qiang(1994–), male, Master candidate. E-mail: sqw@mail.ustc.edu.cn
Supported by:
National Key R&D Program of China(2017YFA0303500);National Natural Science Foundation of China(11574280);National Natural Science Foundation of China(21727801);National Natural Science Foundation of China(11605201);National Natural Science Foundation of China(U1632151);National Postdoctoral Program for Innovative Talents(BX 20190315);NSFC-MAECI(51861135202);CAS Key Research Program of Frontier Sciences(QYZDB-SSW-SLH018);Fundamental Research Funds for the Central Universities(WK2310000074)

摘要/Abstract

摘要：

本研究提出一种Mn ²⁺插层策略用于优化V₂C MXene的储钠性能。Mn ²⁺的插层不仅扩大了V₂C MXene的层间距同时形成了V-O-Mn 共价键, 有利于稳定V₂C的结构, 抑制Na ⁺脱嵌过程中由于体积变化引起的结构坍塌。结果表明, 插层后的V₂C MXene(V₂C@Mn)电极在电流密度为0.05 A·g ^-1时具有425 mAh·g ^-1的高比容量, 并且经过1200次长循环后容量还有70%保留。V₂C@Mn优异的性能表明阳离子插层调控的MXene在Na ⁺存储方面具有潜在的应用前景。

关键词: 层状材料, V₂C MXene, 钠离子存储, 金属阳离子插层, 同步辐射吸收谱

Abstract:

Mn ²⁺ intercalation strategy to optimize the sodium storage performance of V₂C MXene was studied. The intercalated Mn ²⁺ not only enlarged the interlayer spacing of V₂C MXene but also formed a V-O-Mn covalent bond, which was beneficial to stabilize the structure of V₂C and inhibit the structural collapse caused by volume change during Na ⁺ decalation or intercalation. As a result, the intercalated V₂C MXene (V₂C@Mn) electrode showed a high specific capacity of 425 mAh·g ^-1 at the current density of 0.05 A·g ^-1, and 70% retention after 1200 cycles. This result clearly suggests that cations intercalated MXene has a great prospect in Na ⁺ storage.

Key words: layered material, V₂C Mxene, Na ⁺ storage, metal cation intercalation, XAFS

中图分类号:

TQ174

魏世强, 王昌达, 张鹏军, 朱可夫, 陈双明, 宋礼. Mn ²⁺插层V₂C MXene应用于钠离子电池的研究[J]. 无机材料学报, 2020, 35(1): 139-144.

WEI Shi-Qiang, WANG Chang-Da, ZHANG Peng-Jun, ZHU Ke-Fu, CHEN Shuang-Ming, SONG Li. Mn ²⁺ Intercalated V₂C MXene for Enhanced Sodium Ion Battery[J]. Journal of Inorganic Materials, 2020, 35(1): 139-144.

图/表 4

Fig. 1 Mophological characterization of V2C@Mn (a) XRD patterns of V2C, V2C-K and V2C@Mn; (b) SEM image of as-prepared V2C@Mn; (c) TEM image of as prepared V2C@Mn; (d) Elements mapping of V2C@Mn, from left to right: scanning area map of V, O and Mn

Fig. 2 Structural characterization of V2C@Mn MXene (a) High resolution XPS of manganese; (b) Spectra of XANES for V2C@Mn MXene and MnO standard sample; (c) Fourier-transformed Mn K-edge EXAFS spectra of V2C@Mn MXene and MnO standard sample; (d) V L-edge and O K-edge XANES spectra of pure V2C MXene and V2C@Mn MXene

Fig. 3 Electrochemical performance in half-cell (a) CV curves of V2C@Mn MXene electrode at the scan rate from 0.1 to 1.0 mV·s-1; (b) Rate performance of V2C@Mn and pure V2C electrodes at different current densities; (c) Charge and discharge profiles of V2C@Mn at different current densities; (d) Cycle stabilities of V2C@Mn and pure V2C electrodes at the current density of 1000 mA·g-1. Inset in (a) is the variation of lgi versus lgv

Fig. 4 Ex-situ X-ray photoelectron spectroscopy at different charge and discharge voltages

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Mn ²⁺插层V₂C MXene应用于钠离子电池的研究

Mn ²⁺ Intercalated V₂C MXene for Enhanced Sodium Ion Battery

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