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J. Low Power Electron. Appl. 2018, 8(3), 32; https://doi.org/10.3390/jlpea8030032

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

1
Department of Applied Physics, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
2
CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences, Beijing 100083, China
3
College of Nanoscience and Technology, University of Chinese Academy of Sciences, Bejing 100049, China
*
Authors to whom correspondence should be addressed.
Received: 13 June 2018 / Revised: 27 August 2018 / Accepted: 4 September 2018 / Published: 11 September 2018
(This article belongs to the Special Issue Flexible Electronics and Self-Powered Systems)
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Abstract

Porous materials have superior electrochemical performance owing to its their structure, which could increase the specific and contact area with the electrode. The spinel Li4Mn5O12 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 Li4Mn5O12 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 Li4Mn5O12 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 Li4Mn5O12, the waxberry-like nanoporous spinel Li4Mn5O12 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 Li4Mn5O12 could provide a potential application in high performance supercapacitors. View Full-Text
Keywords: supercapacitors; Li4Mn5O12; waxberry-like nanosphere; high performance supercapacitors; Li4Mn5O12; waxberry-like nanosphere; high performance
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Ji, P.; Xi, Y.; Zhang, C.; Wang, C.; Hu, C.; Guan, Y.; Zhang, D. Waxberry-Like Nanosphere Li4Mn5O12 as High Performance Electrode Materials for Supercapacitors. J. Low Power Electron. Appl. 2018, 8, 32.

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