The Effect of the Lithium Borate Surface Layer on the Electrochemical Properties of the Lithium-Ion Battery Positive Electrode Material LiNi1/3Mn1/3Co1/3O2

• Published in: Russian journal of electrochemistry Vol. 57; no. 11; pp. 1055 - 1069
• Main Authors: Nefedova, K. V., Zhuravlev, V. D., Murzakaev, A. M., Yagodin, V. V., Kuznetsov, M. V., Evshchik, E. Yu, Skachkov, V. M., Bushkova, O. V.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.11.2021; Springer Nature B.V
• Subjects: Amorphous materials; Boron oxides; Chemistry; Chemistry and Materials Science; Electrochemical analysis; Electrochemistry; Electrode materials; Lithium; Lithium borates; Lithium-ion batteries; Physical Chemistry; Protective coatings; Rechargeable batteries; Solid solutions; Surface layers; 3Li; Mn; surface treatment; X‑ray photoelectron spectroscopy; X-ray diffraction; electrochemical behavior; transmission electron microscopy; LiNi; lithium-ion battery; O∙B; Сo; O
• ISSN: 1023-1935; 1608-3342
• DOI: 10.1134/S1023193521100104

The electrochemical behavior of layer-structure LiNi 1/3 Mn 1/3 Сo 1/3 O 2 solid solution, a positive electrode material of lithium-ion battery, with surface protective layer of amorphous lithium borate is studied. The protective coating is prepared by the eutectic incongruent melting at 750°C of a pre-synthesized compound Li 3 BO 3 , mechanically mixed with LiNi 1/3 Mn 1/3 Сo 1/3 O 2 powder. The glassy lithium borate 3Li 2 O∙B 2 O 3 is found to form island-like structures presumably localized in electrochemically active regions of the active-material particles’ surface. The optimal lithium borate content, which makes possible the LiNi 1/3 Mn 1/3 Сo 1/3 O 2 stable cycling at 0.5 C rate with the maximum discharge capacity, is found to be equal to 1 wt %.