Reciprocal irreversibility compensation of LiNi0.2Co0.2Al0.1Mn0.45O2 cathode and silicon oxide anode in new Li-ion battery

被引：3
作者：
Minnetti L. [1 ]
Marangon V. [2 ,3 ]
Andreotti P. [3 ]
Staffolani A. [1 ]
Nobili F. [1 ]
Hassoun J. [2 ,3 ,4 ]
机构：
[1] School of Sciences and Technologies – Chemistry Division, University of Camerino, Via Madonna delle Carceri ChIP, Camerino
[2] Graphene Labs, Istituto Italiano di Tecnologia, via Morego 30, Genoa
[3] Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, Via Fossato di Mortara 17, Ferrara
[4] National Interuniversity Consortium of Materials Science and Technology (INSTM) University of Ferrara Research Unit, University of Ferrara, Via Fossato di Mortara, 17, Ferrara
来源：
Electrochimica Acta | 2023年 / 452卷
基金：
欧盟地平线“2020”;
关键词：
Cell balance; Li-ion battery; LiNi[!sub]0.2[!/sub]Co[!sub]0.2[!/sub]Al[!sub]0.1[!/sub]Mn[!sub]0.45[!/sub]O[!sub]2[!/sub] cathode; Silicon oxide anode; Synthesis;
D O I：
10.1016/j.electacta.2023.142263
中图分类号：
学科分类号：
摘要：
A layered LiNi0.2Co0.2Al0.1Mn0.45O2 cathode is herein synthetized and investigated. Scanning electron microscopy (SEM) shows the layered morphology of the composite powder, while energy dispersive X-ray spectroscopy (EDS) and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) confirm the achieved stoichiometry. X-ray diffraction (XRD) well identifies the layered structure unit cell, and Raman spectroscopy displays the corresponding M-O bonds motions. The cycling voltammetry (CV) of LiNi0.2Co0.2Al0.1Mn0.45O2 in lithium half-cell reveals an electrochemical process characterized by a remarkable irreversible oxidation taking place at 4.6 V vs. Li+/Li during the first scan, and subsequent reversible Li (de)intercalation centered at 3.8 V vs. Li+/Li with interphase resistance limited to 16 Ω upon activation as indicated by electrochemical impedance spectroscopy (EIS). The relevant irreversibility during first charge is also detected by galvanostatic cycling in a lithium half-cell subsequently operating at an average voltage of 3.8 V with a stable trend, and a maximum specific capacity of 130 mAh g−1. The initial irreversible capacity of the layered cathode is advantageously exploited for compensating the pristine inefficiency of the Li-alloying composite anode in a proof-of-concept Li-ion battery achieved by combining the LiNi0.2Co0.2Al0.1Mn0.45O2 with a silicon oxide composite (SiOx-C) without any preliminary pre-treatment of the electrodes. The full-cell displays a cycling behavior strongly influenced by the anode/cathode ratio, and the corresponding EIS performed both on the single electrodes and on the Li-ion cell by using an additional lithium reference suggests a controlling role of the anode interphase and possible enhancements through a slight excess of cathode material. © 2023 Elsevier Ltd
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