Issue 18, 2020

Multiradical-stabilized hollow carbon spheres as a pressure-resistant cathode for fast lithium/sodium storage with excellent performance

Abstract

Improving the energy density of pressure-tolerant batteries is an important approach to improving the working ability of underwater robots. Organic radical cathodes have a faster reaction mechanism than inorganic transition metal oxide cathodes but, currently, still do not provide high capacity, high rate, and stable cycling performance at the same time. Therefore, we fabricated a pressure-resistant organic radical cathode based on hollow carbon spheres (HCSs) with a stable structure and chemically modified the HCSs with nitroxide radical monomers (TEMPO-HCSs). Enriched nitroxide radicals form more active sites on HCSs, resulting in a better conductivity than that of nitroxide radical polymers and an improved electrochemical performance. The grafted nitroxide radicals stabilize the HCS structure, which is beneficial for application of TEMPO-HCSs as the cathode in lithium ion and sodium ion batteries at 5 MPa, showing high specific capacities of 339 and 297 mA h g−1, respectively, as well as high rate and stable cycling performances. Constructing high-performance and pressure-resistant cathodes is a prerequisite for an increased efficiency of underwater robots.

Graphical abstract: Multiradical-stabilized hollow carbon spheres as a pressure-resistant cathode for fast lithium/sodium storage with excellent performance

Supplementary files

Article information

Article type
Communication
Submitted
23 Mar 2020
Accepted
24 Apr 2020
First published
24 Apr 2020

J. Mater. Chem. A, 2020,8, 8875-8882

Multiradical-stabilized hollow carbon spheres as a pressure-resistant cathode for fast lithium/sodium storage with excellent performance

C. Lu, G. Pan, Z. Mao, L. Shi, Q. Huang, W. Tian, Y. Hu, H. Wu, Z. Wang and K. Sun, J. Mater. Chem. A, 2020, 8, 8875 DOI: 10.1039/D0TA03305G

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