钴
电化学
镍
阴极
硅烷
材料科学
氧化钴
氧化镍
对偶(语法数字)
氧化物
化学工程
无机化学
化学
冶金
复合材料
电极
物理化学
艺术
文学类
工程类
作者
Sri Harsha Akella,Mamta Sham Lal,Yogendra Kumar,Melina Zysler,Dmitry Bravo‐Zhivotovskii,Yitzhak Apeloig,Malachi Noked
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2024-02-22
标识
DOI:10.1021/acsaem.3c03273
摘要
With an increasing demand for high-energy-density lithium-ion batteries (LIBs), nickel-rich cathodes such as LiNi0.9Mn0.05Co0.05O2 (NMC90) have gained significant interest due to their relatively low cobalt and high specific energy. However, cycling stability is compromised due to parasitic reactions at the electrode–electrolyte interfaces of NMC90. Herein, we demonstrate improved electrochemical properties of NMC90 using di-tert-butylmethyl adamantoyl silane (RSiCOAd: R is tBu(CH3)2 and Ad is 1-Ad) as an additive in a commercial electrolyte. Upon detailed electrochemical and spectroscopic analysis, we demonstrate that the RSiCOAd additive undergoes in situ decomposition to form a fluorinated organosiloxane passivation layer on the NMC90 surface and enhanced fluorination on the lithium anode surface. This phenomenon could significantly mitigate the parasitic reactions at the cathode–electrolyte interface while improving the electrochemical performances. Furthermore, the practical viability of the RSiCOAd additive is evaluated by full-cell studies with the graphite anode. After prolonged 200 cycles, full cells containing RSiCOAd with the incorporation of just 1% additive demonstrate an impressive ∼10% higher capacity retention, outperforming pristine NMC90 full cells.
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