Structural and Electrochemical Impacts of Mg/Mn Dual Dopants on the LiNiO2 Cathode in Li-Metal Batteries

ACS Applied Materials & Interfaces
Linqin MuFeng Lin

Abstract

Doping chemistry has been regarded as an efficient strategy to overcome some fundamental challenges facing the "no-cobalt" LiNiO2 cathode materials. By utilizing the doping chemistry, we evaluate the battery performance and structural/chemical reversibility of a new no-cobalt cathode material (Mg/Mn-LiNiO2). The unique dual dopants drive Mg and Mn to occupy the Li site and Ni site, respectively. The Mg/Mn-LiNiO2 cathode delivers smooth voltage profiles, enhanced structural stability, elevated self-discharge resistance, and inhibited nickel dissolution. As a result, the Mg/Mn-LiNiO2 cathode enables improved cycling stability in lithium metal batteries with the conventional carbonate electrolyte: 80% capacity retention after 350 cycles at C/3, and 67% capacity retention after 500 cycles at 2C (22 °C). We then take the Mg/Mn-LiNiO2 as the platform to investigate the local structural and chemical reversibility, where we identify that the irreversibility takes place starting from the very first cycle. The highly reactive surface induces the surface oxygen loss, metal reduction reaching the subsurface, and metal dissolution. Our data demonstrate that the dual dopants can, to some degree, mitigate the irreversibility and improve the c...Continue Reading

References

Mar 16, 2018·Angewandte Chemie·Nika MahneStefan A Freunberger
Dec 12, 2018·Angewandte Chemie·Matteo BianchiniJürgen Janek
May 31, 2019·Physical Chemistry Chemical Physics : PCCP·Yongseon Kim

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Citations

Sep 2, 2020·ACS Applied Materials & Interfaces·Won Mo Seong, Arumugam Manthiram
Nov 11, 2020·ACS Applied Materials & Interfaces·Alex Mesnier, Arumugam Manthiram

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