High cycle stability of LiNi0.83Co0.11Mn0.06O2 by coating mixed conductors Li7.3La3Zr1.7Co0.3O12 using the anhydrous method.

Nickel-rich cathode LiNi_0.83Co_0.11Mn_0.06O₂ (NCM) has a high specific discharge capacity and low cost, and is a very promising cathode material. However, NCM exhibits poor structural and chemical stability, resulting in poor cycle stability. Surface coating can maintain structural stability, isolate cathode materials and electrolytes, and effectively improve the cycle stability of NCM. The mixed ion–electron conductor Li_7.3La₃Zr_1.7Co_0.3O₁₂ (LZC) was coated on the surface of NCM using an anhydrous co-precipitation method, with a coating thickness of 2% (molar ratio), which promotes the conduction of electrons and ions. The coated positive electrode material was prepared into a liquid electrolyte half battery. After 200 cycles at 1 C between 2.8 and 4.5 V, the capacity retention of NCM is only 62.2%, while the capacity retention of the most excellent coating sample increased to 79.2%. [ABSTRACT FROM AUTHOR]