Microbial pyrazine diamine is a novel electrolyte additive that shields high-voltage LiNi1/3Co1/3Mn1/3O2 cathodes.

Autor: Gupta, Agman, Badam, Rajashekar, Takamori, Noriyuki, Minakawa, Hajime, Masuo, Shunsuke, Takaya, Naoki, Matsumi, Noriyoshi
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Zdroj: Scientific Reports; 11/25/2022, Vol. 12 Issue 1, p1-12, 12p
Abstrakt: The uncontrolled oxidative decomposition of electrolyte while operating at high potential (> 4.2 V vs Li/Li+) severely affects the performance of high-energy density transition metal oxide-based materials as cathodes in Li-ion batteries. To restrict this degradative response of electrolyte species, the need for functional molecules as electrolyte additives that can restrict the electrolytic decomposition is imminent. In this regard, bio-derived molecules are cost-effective, environment friendly, and non-toxic alternatives to their synthetic counter parts. Here, we report the application of microbially synthesized 2,5-dimethyl-3,6-bis(4-aminobenzyl)pyrazine (DMBAP) as an electrolyte additive that stabilizes high-voltage (4.5 V vs Li/Li+) LiNi1/3Mn1/3Co1/3O2 cathodes. The high-lying highest occupied molecular orbital of bio-additive (DMBAP) inspires its sacrificial in situ oxidative decomposition to form an organic passivation layer on the cathode surface. This restricts the excessive electrolyte decomposition to form a tailored cathode electrolyte interface to administer cyclic stability and enhance the capacity retention of the cathode. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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