A Novel Perspective on Surface Modification of LiNi0.5Co0.2Mn0.3O2 Cathode Material for Lithium‐Ion Batteries. Issue 18 (19th September 2022)

• Record Type: Journal Article
• Authors: Zhang, Yang; Song, Ye; Liu, Lin; Ma, Juanjuan; Liu, Jie
• Is Part Of: ChemElectroChem. Volume 9:Issue 18(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-19
• Subjects: Cathode material -- Lithium-ion batteries -- Load point welding -- Structure stability -- Surface modification; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202200814
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: High nickel ternary cathode materials have caught much consideration because of their remarkable energy density, cycling stability, and low pollution. However, the materials with the instability of nickel are prone to crack during long‐term cycling processes; secondly, the residual alkali on the surface of materials would react with the electrolyte to corrode the electrode. To solve the above problems, the particle surface is usually coated with a protective layer of Al2 O3 with good compatibility and thermal stability. But this method is relatively complicated and produces toxic organic solvents. In addition, the thick coating layer increases the charge transport resistance and decreases the lithium‐ion transport rate. Herein, we design a novel surface modification strategy: nano‐Al2 O3 is loaded on the micro‐particles to form a series of stable points to improve the stability of the interface boundary, while the charge transmission impedance does not change significantly. As a result, the lithium‐ion transmission coefficient is greatly improved, whose capacity retention rate is still up to 86.17 % at 1 C after 100 cycles. This surface modification strategy is simple to operate and low in cost, which could meet industrial mass production. Abstract : Point‐coating adopts dry grinding method, which simplifies the relatively complex wet chemical process of surface‐coating. It can inhibit surface side reactions and prevent particle cracking with the same effect as surface‐coating. At the same time, it will not form a thick inert coating layer to hinder the migration of lithium ions.