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journal article·2018-06-01Open access

Temperature coefficient of redox potential of LixFePO4

Yuya Fukuzumi, Yoyo Hinuma, Yutaka Moritomo

AIP Advances· Volume 8· Issue 6
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Source abstract

Abstract

The temperature coefficient (α≡∂V∂T) of the redox potential (V) is a significant physical quantity for energy conversion. A thermocell can convert heat energy into electric energy by using the difference in α between cathode and anode materials. Here, we carefully determined α of a prototypical intercalation compound, LixFePO4, against Li concentration (x). α is found to be ≈ 0.90 mV/K irrespective of x, reflecting phase separation (PS) into LiFePO4 and FePO4. We further evaluated the entropies (S) of LiFePO4 and FePO4 by means of first-principles calculations. Considering the solvent effect of ≈ 0.50 mV/K, the residual amount (≈ 0.40 mV/K) of α is well reproduced by 1eΔS between LiFePO4 and FePO4, where e is the elementary charge (> 0).
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Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Transition Metal Oxide Nanomaterials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Graduate School of Pure and Applied Sciences, University of Tsukuba 1 , Tsukuba 305-8571, Japan

Center for Frontier Science, Chiba University 2 , Chiba 263-8522, Japan

Graduate School of Pure and Applied Sciences, University of Tsukuba 3 , Tsukuba 305-8571, Japan ; , Tsukuba 305-8571, Japan ; and , Tsukuba 305-8571, Japan

Faculty of Pure and Applied Sciences, University of Tsukuba 3 , Tsukuba 305-8571, Japan ; , Tsukuba 305-8571, Japan ; and , Tsukuba 305-8571, Japan

Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba 3 , Tsukuba 305-8571, Japan ; , Tsukuba 305-8571, Japan ; and , Tsukuba 305-8571, Japan

Funding

Japan Society for the Promotion of Science

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