Do Increased Ni Contents in LiNixMnyCozO2 (NMC) Electrodes Decrease Structural and Thermal Stability of Li Ion Batteries? A Thorough Look by Consideration of the Li+ Extraction Ratio

被引：92

作者：

Kasnatscheew, Johannes ^{[1
]}

Roeser, Stephan ^{[2
]}

Boerner, Markus ^{[2
]}

Winter, Martin ^{[1
,2
]}

机构：

[1] Forschungszentrum Julich, Helmholtz Inst Munster, IEK 12, Corrensstr 46, D-48149 Munster, Germany

[2] Univ Munster, Inst Phys Chem, MEET Battery Res Ctr, Corrensstr 46, D-48149 Munster, Germany

来源：

ACS APPLIED ENERGY MATERIALS | 2019年 / 2卷 / 11期

关键词：

Ni-rich NMC; charge cutoff potential; Li+ extraction ratio; structural stability; thermal stability; TRANSITION-METAL OXIDE; CATHODE MATERIALS; RECENT PROGRESS; LITHIUM; PERFORMANCE; SAFETY; CELLS;

D O I：

10.1021/acsaem.9b01440

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Apparently, high nickel content in LiNixMnyCozO2 (NMC) is beneficial in terms of specific capacity but detrimental in terms of structural and thermal stabilities. Such conclusions are conventionally drawn from experiments where NMCs have been charged to an equal cutoff potential, which suggests an unequal Li+ extraction ratio. Therefore, the validity of those conclusions must be questioned, because the latter dictates structural stability. This study shows that the order of structural stability significantly differs when Li+ extraction ratio rather than charge cutoff potential is considered while the thermal stability indeed correlates with the nickel content, and is thus rather unaffected by the Li+ extraction ratio.

引用

页码：7733 / 7737

页数：9

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