Impact of 3‐Cyanopropionic Acid Methyl Ester on the Electrochemical Performance of ZnMn2O4 as Negative Electrode for Li‐Ion Batteries

Zijian Zhao,Julia Maibach,Annika Bothe,Andrea Balducci,Sonia Dsoke,Lydia Gehrlein

doi:10.1002/ente.202100247

Abstract

Due to their high theoretical capacity, transition metal oxide compounds are promising electrode materials for lithium‐ion batteries. However, one drawback is associated with relevant capacity fluctuations during cycling, widely observed in the literature. Such strong capacity variation can result in practical problems when positive and negative electrode materials have to be matched in a full cell. Herein, the study of ZnMn2O4 (ZMO) in a nonconventional electrolyte based on 3‐cyanopropionic acid methyl ester (CPAME) solvent and LiPF6 salt is reported for the first time. Although ZMO in LiPF6/CPAME electrolyte displays a dramatic capacity decay during the first cycles, it shows promising cycling ability and a suppressed capacity fluctuation when vinylene carbonate (VC) is used as an additive to the CPAME‐based electrolyte. To understand the nature of the solid electrolyte interphase (SEI), the electrochemical study is correlated to ex situ X‐ray photoelectron spectroscopy (XPS).

Highlights

Introduction1. Introduction promising electrode materials for lithium-ion batteries
We investigated the use of a CAPME-based electrolyte in combination with ZMO -based electrodes
This work reports for the first time about the electrochemical behavior of cyanopropionic acid methyl ester (CPAME)-based electrolytes with conversion-type materials (i.e., ZMO, in this specific case)

Summary

Introduction

1. Introduction promising electrode materials for lithium-ion batteries. One drawback is associated with relevant capacity fluctuations during cycling, widely observed in the literature. Such strong capacity variation can result in practical problems when positive and negative electrode materials have to be matched in a full cell. The study of ZnMn2O4 (ZMO) in a nonconventional electrolyte based on Conversion/alloying-type metal oxide (or sulfide) materials are gaining increasing attention as a new class of negative electrodes for Li-ion batteries (LIBs). To understand the nature of the solid electrolyte interphase (SEI), the electrochemical study is correlated to ex situ X-ray type of compound, lithium storage relies on the combination of both mechanisms, which can confer much higher theoretical capacities, lower average operational potentials, and smaller discharge/charge voltage hysteresis.[1] After the conversion reaction, metallic nanograins are generated and disphotoelectron spectroscopy (XPS). Zhao College of Chemical Engineering and Material Science Tianjin University of Science & Technology (TUST) Tianjin 300457, China

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