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Continuous Hydrothermal Synthesis of Metal Germanates (M2GeO4 ; M = Co, Mn, Zn) for High Capacity Negative Electrodes in Li‐ion Batteries

Bauer, Dustin; Ashton, Thomas E.; Groves, Alexandra R.; Dey, Avishek; Krishnamurthy, Satheesh; Matsumi, Noriyoshi and Darr, Jawwad A. (2019). Continuous Hydrothermal Synthesis of Metal Germanates (M2GeO4 ; M = Co, Mn, Zn) for High Capacity Negative Electrodes in Li‐ion Batteries. Energy Technology (Early Access).

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DOI (Digital Object Identifier) Link: https://doi.org/10.1002/ente.201900692
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Abstract

Nanosized metal germanates (M2GeO4; M = Co, Mn, Zn) were synthesised using a continuous hydrothermal flow synthesis process for the first time. Phase‐pure rhombohedral Zn2GeO4 nanorods, cubic spinel Co2GeO4 nanoparticles, and orthorhombic Mn2GeO4 nanotubes/nanoparticles were obtained. The electrochemical properties of all samples as active materials for negative electrodes in Li‐ion half cells was explored. The galvanostatic and potentiodynamic testing was conducted in the potential range 3.00 to 0.05 V vs. Li/Li+. The results suggest that both alloying and conversion reactions associated with Ge contributed to the stored charge capacity; Zn2GeO4 showed a high specific capacity of 600 mAh g-1 (10 cycles at 0.1 A g -1) due to alloying and conversion reactions for both Ge and Zn. Mn2GeO4 was studied for the first time as a potential negative electrode material in a Li‐ion half‐cell; an excellent specific charge capacity of 510 mAh g-1 (10 cycles / 0.1 A g-1) was obtained with a significant contribution to charge arising from the conversion reaction of Mn to MnO upon delithiation. In contrast, Co2GeO4 only showed a specific capacity of 240 mAh g-1, after 10 cycles at the same current rate, which suggested that cobalt had little or no benefit for enhancing stored charge in the germanate.

Item Type: Journal Item
Copyright Holders: 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN: 2194-4296
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 66154
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 12 Aug 2019 09:04
Last Modified: 10 Nov 2019 18:46
URI: http://oro.open.ac.uk/id/eprint/66154
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