Work

Configuration entropy effect on temperature coefficient of redox potential of P 2-Na x CoO 2

Year: 2019

Type: article

Abstract: The temperature coefficient ( α ) of redox potential ( V ) is a significant material parameter that coverts thermal energy into electric energy. In this paper, we determined α of P 2-type Na x CoO 2 against the Na + concentration ( x ). The solid component ( α solid ) of α scatters from −0.18 to 0.64 mV K −1 . The phase separation model cannot reproduce the x -dependence even qualitatively. We interpreted the unexpected disagreement in terms of the residual configuration entropy in the pseudo-disordered region between the Na + ordered phases.

Source: Japanese Journal of Applied Physics

DOI: 10.7567/1347-4065/ab19db

Authors: Yuya Fukuzumi, Yoyo Hinuma, Yutaka Moritomo

Institutions: University of Tsukuba, Chiba University, Center for Frontier Science, Chiba University, Tsukuba Research Center for Energy Materials Science

Language: English

Topic: Advancements in Battery Materials

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funder: Japan Society for the Promotion of Science

Awards: G1287008229, 酸化還元電位の温度係数の応用と統一的理解, G3445661345, Local structure and structural evolution of battery materials, G8798173305