POLYCATIONIC DOPING OF THE LATP CERAMIC ELECTROLYTE FOR LI-ION BATTERIES
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Date
2022
Authors
Mashekova, Aiym
Baltash, Yelnury
Yegamkulov, Mukagali
Trussov, Ivan
Bakenov, Zhumabay
Mukanova, Aliya
Journal Title
Journal ISSN
Volume Title
Publisher
RSC Advances
Abstract
All-solid-state Li-ion batteries (LIBs) with a solid electrolyte instead of a liquid one demonstrate significantly
higher safety in contrast with the conventional liquid-based LIBs. An inorganic NASICON-type Li conductor
Li1.3Al0.3Ti1.7(PO4)3 (LATP) is a promising solid electrolyte with an ionic conductivity of up to 10−3 S cm−1 at
room temperature. However, LATP gradually degrades in contact with Li metal because of reduction of Ti4+
to Ti3+, resulting in a lower ionic conductivity at the electrolyte–electrode interface. Cation doping is
a promising approach to stabilize the LATP structure and mitigate the Ti reduction. Here, we report our
findings on the alternative polycationic doping strategy of the LiTi2(PO4)3 (LTP) structure, when
a heterovalent cation is added along with Al. In particular, we studied the effect of tetravalent and
divalent cation dopants (Zr, Hf, Ca, Mg, Sr) of LATP on the Li-ion conduction and Ti reduction during
interaction with lithium metal. The samples were prepared by molten flux and solid-state reaction
methods. The structure, morphology, and ion-transport properties of the samples were analyzed. The
activation energy of Li-ion migration in all synthesized systems was calculated based on the
electrochemical impedance spectroscopy (EIS) data retrieved for a temperature range of 25–100 °C.
From the obtained results, the tetravalent doping (Zr4+ and Hf4+) appeared to be a more promissing
route to improve the LATP electrolyte than the divalent doping (Mg2+, Ca2+, and Sr2+). The X-ray
photoelectron spectroscopy analysis of the samples after their contact with lithium provided the data,
which could shed light on the effect of the incorporated dopants onto the Ti reduction.
Description
Keywords
Type of access: Open Access, LATP ceramic electrolyte, Li-ion batteries
Citation
Mashekova, A., Baltash, Y., Yegamkulov, M., Trussov, I., Bakenov, Z., & Mukanova, A. (2022b). Polycationic doping of the LATP ceramic electrolyte for Li-ion batteries. RSC Advances, 12(46), 29595–29601. https://doi.org/10.1039/d2ra05782d