Ultra-high-rate lithium-sulfur batteries with high sulfur loading enabled by Mn2O3-carbonized bacterial cellulose composite as a cathode host.

Bharti, V.K. and Sharma, Chandra Shekhar and Khandelwal, Mudrika (2022) Ultra-high-rate lithium-sulfur batteries with high sulfur loading enabled by Mn2O3-carbonized bacterial cellulose composite as a cathode host. Electrochimica Acta, 422. pp. 1-15. ISSN 0013-4686

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Abstract

Lithium-sulfur batteries have received significant attention due to their high specific capacity and natural abundance of the sulfur cathode. However, the notorious issue of higher-order lithium-polysulfides dissolution causes inferior cycling and poor electrochemical performance. To overcome the challenge, here, biodegradable and environmentally friendly carbonized bacterial cellulose (CBC) is used as the sulfur host. Further, Mn2O3 is incorporated in bacterial cellulose using hydrothermal synthesis and investigated as a sulfur host. The composite is prepared by a facile encapsulation “melt-diffusion” strategy. The high electronic conductivity of the CBC provides an efficient pathway to carry out redox reactions, and Mn2O3 helps to restrain and convert higher-order lithium-polysulfides to lower-order lithium-polysulfides. Further, the first-principle density functional theory calculation is performed to investigate and understand the role of carbon (CBC) and Mn2O3 in the host material. The lithium-sulfur cell with Mn2O3@CBC cathode host delivers a significantly high initial reversible capacity of 1150 mAh g−1(cathode) (i.e., 1450 mAh g−1(sulfur)) at 0.1 C. It retains a reversible capacity of 254 mAh g−1(cathode) (i.e., 554 mAh g−1(sulfur)) even at the ultra-high rate of 15.0 C. Furthermore, to achieve a practical high energy density and its commercial adoption, we tested lithium-sulfur cells with high areal sulfur loading of 4.2 mg cm−2. The cell shows promising electrochemical performance for long 500 cycles with a capacity retention of 70%. The cell performance is competitive and superior to the current state-of-the-art lithium-sulfur cells reported in the literature. © 2022 Elsevier Ltd

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IITH Creators:

IITH Creators	ORCiD
Sharma, Chandra Shekhar	https://orcid.org/0000-0003-3821-1471
Khandelwal, Mudrika	https://orcid.org/0000-0001-9717-5381

Item Type:

Article

Additional Information:

The authors would like to acknowledge DST-FIST SEM (JEOL JSM 7800F) facility at Materials Science and Metallurgical Engineering (MSME), IIT Hyderabad. The authors would like to acknowledge Dr. Sunil Kumar Maity and Mr. Bhushan Shrikrushna Shrirame for helping in BET measurements at IIT Hyderabad. The authors acknowledge Dr. Akhilesh Kumar Singh at IIT Bhubaneswar for providing computational resources support. The authors also acknowledge financial support from Prime Minister’s Research Fellowship (PMRF) and SERB (CRG/2018/ 004441). CSS acknowledges the financial support from Ministry of Ed- ucation & Department of Heavy Industries supported IMPRINT project 7035

Uncontrolled Keywords:

Carbonized bacterial cellulose, Density functional theory, High sulfur loading, Lithium-sulfur batteries, Mn2O3 electrocatalysts

Subjects:

Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering
Chemical Engineering

Divisions:

Department of Chemical Engineering
Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

21 Jun 2022 05:46

Last Modified:

22 Jun 2022 08:55