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Dr. Nagmani

Project Scientist at Department of Sustainable Energy Engineering, Indian Institute of Technology Kanpur. Ph.D. from School of Energy Science and Engineering, Indian Institute of Technology Kharagpur

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Advanced Characterization Techniques for Insights into the Sodium Storage Mechanism of Hard Carbon Anodes: Recent Advances and Future Perspectives

Posted by Poonam Sinha on September 21, 2024

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Breakthrough in Sodium-Ion Battery Technology: Unmodified Hard Carbon Anode with High Capacity of 422 mAh/g and Energy Density Unveiled

Posted by Poonam Sinha on April 11, 2024

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Convocation: Gold Medalist with Hon'ble President of India

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Enhanced Performance of Ultra-Microporous Hard Carbon Spheres as Anode in Half /Full Cells for Sodium-ion Batteries through Optimized Carbonate Ester Electrolytes

Symposium: EN05: Emerging Materials for Electrochemical Energy Storage Devices—Degradation andFailure Characterization—From Composition, Structure and Interfaces to Deployed Systems Title: Enhanced Performance of Ultra-Microporous Hard Carbon Spheres as Anode in Half /Full Cells for Sodium-ion Batteries through Optimized Carbonate Ester Electrolytes. Author(s): Nagmani , Sreeraj Puravankara Presented @ 2022, MRS Spring Meeting Abstract:

Advanced Characterization Techniques for Insights into the Sodium Storage Mechanism of Hard Carbon Anodes: Recent Advances and Future Perspectives

ACS Energy & Fuels ( IF = 5.3 ), Publication Date = 20 September 2024 DOI : https://doi.org/10.1021/acs.energyfuels.4c01707 Authors: Nagmani,* Ashish Kumar, Chandra Gowthami, Ravula Vijay, Tata Narasinga Rao, Srinivasan Anandan ABSTRACT : Non-graphitizable hard carbon (HC) possesses numerous surface imperfections, functional groups, and randomly arranged graphene sheets (turbostratic), generating micro/meso/macropores. The sodium-ion storage mechanism in HC anodes remains unclear as it heavily relies on the diverse structures resulting from different precursor materials and heat treatment temperatures used for HCs. Various models have been anticipated to comprehend the analysis of structural and sodium storage mechanisms in HCs. Amidst conflicting reports, the prevailing storage model suggests an “adsorption–intercalation–filling” mechanism. It is widely accepted that lithium insertion into the graphene interlayer forms “graphitic intercalation compounds” (GICs), which

Breakthrough in Sodium-Ion Battery Technology: Unmodified Hard Carbon Anode with High Capacity of 422 mAh/g and Energy Density Unveiled

Date: 16-02-2024 Researchers from the Indian Institute of Technology Kharagpur have achieved a significant breakthrough in sodium-ion battery technology with their work published in the prestigious international blind peer-reviewed journal Chemical Communication by The Royal Society of Chemistry. The study introduces micro-spherical hard carbons (MSHCs) with distinctive porosity features, synthesized through an innovative microwave-assisted solvothermal pre-treatment of sucrose, followed by carbonization. These MSHCs exhibit exceptional properties, including large interlayer spacing of turbostratic graphene nanosheets, hierarchical pore structures, and closed pores, resulting in outstanding performance as anodes for sodium-ion batteries. With a high reversible capacity of 422 mA h/g at a 0.1C rate and outstanding capacity retention of 84% after 500 cycles at 1C, the MSHC sets a new standard for sodium storage performance. Further analyses reveal a mechanism shift from intercalation t

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