Affiliation:
1. Taiyuan University of Technology
2. Wuhan Institute of Technology
Abstract
Abstract
Nickel-rich layered oxide LiNi0.8Co0.1Mn0.1O2 (NCM) cathode material is widely noticed because of its high energy density and low cost. The widely explored NCM often shows inferior surface stability and tends to generate residual lithium carbonate (Li2CO3) on the surface, deteriorating the cyclic stability. The work attempts an efficient procedure by adopting polyphosphoric acid (PPA) to generate lithium phosphate (Li3PO4) as the surface coating layer, increasing the capacity retention ratio, which is 84.2% and 72.5% for the modified cathode material NCM@LP-3 (with the addition of 3% PPA) for 300 cycles and 500 cycles at 1 C. Electrochemical impedance spectra results show that the contact resistance and charge transfer resistance of NCM@LP-3 are significantly less than that of NCM after 500 cycles. SEM further demonstrates that microcracks of NCM@LP-3 are less severe than NCM. This work provides an effective method for surface modification.
Publisher
Research Square Platform LLC
Reference37 articles.
1. In situ inorganic conductive network formation in high-voltage single-crystal Ni-rich cathodes;Fan X;Nature Communications,2021
2. Optimized electrochemical performance of Ni rich LiNi0.91Co0.06Mn0.03O2 cathodes for high-energy lithium ion batteries;Lee SH;Sci Rep,2019
3. Surface regulation enables high stability of single-crystal lithium-ion cathodes at high voltage;Zhang F;Nat Commun,2020
4. Dual function Li-reactive coating from residual lithium on Ni-rich NCM cathode material for Lithium-ion batteries;Sattar T;Sci Rep-uk,2021
5. Lithium-ion conductive coating layer on nickel rich layered oxide cathode material with improved electrochemical properties for Li-ion battery;Yuan H;J Alloys Compd,2019