We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Surface Architecture Design of LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub> Cathode with Synergistic Organics Encapsulation to Enhance Electrochemical Stability.
- Authors
Hu, Guorong; Fan, Ju; Lu, Yan; Zhang, Yinjia; Du, Ke; Peng, Zhongdong; Li, Luyu; Zhang, Baichao; Shi, You; Cao, Yanbing
- Abstract
Ni‐rich LiNi0.8Co0.15Al0.05O2 (NCA) material attracts extensive attention due to its high discharge specific capacity, but its distinct drawbacks of rapid capacity decline and poor cycle performance at elevated temperatures and high voltage during charge/discharge cycling restricts its widespread application. To solve these problems, a multifunctional coating layer composed of a lithium‐ion‐conductive lithium polyacrylate (LiPAA) inner layer and a cross‐linked polymer outer layer from certain organic substances of silane‐coupling agent (KH550) and polyacrylic acid (PAA) is successfully designed on the surface of NCA materials, which is favorable for eliminating residual lithium and improving lithium‐ion conductivity, surface stability, and hydrophobicity of NCA materials. In addition, the amount of the coating material is also investigated. A series of characterization methods such as XRD, FTIR, SEM, TEM, and X‐ray photoelectron spectroscopy are used to analyze the morphologies and structures for materials of pristine and modified NCA. It is revealed that the co‐coating layer plays a vital part in reducing the surface residual alkalis and improving the stability of NCA particles; as a result, the modified NCA exhibits a greatly improved rate capability, cycle performance, and low polarization impedance.
- Subjects
ARCHITECTURAL design; HIGH voltages; X-ray photoelectron spectroscopy; ELECTROLYTIC reduction; CROSSLINKED polymers; SURFACE stability; POLYACRYLIC acid
- Publication
ChemSusChem, 2020, Vol 13, Issue 21, p5699
- ISSN
1864-5631
- Publication type
Article
- DOI
10.1002/cssc.202001771