Layered lithium-rich manganese oxide positive electrode material suppressing capacity/voltage attenuation during circulation process effectively and preparation method therefor and application thereof

[0048] Preparation of LiNiO by Spray Pyrolysis 2 Doped with 0.5Li 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2 (LNCMO) cathode material

[0049] Add Li, Ni, Co, Mn acetate into a certain amount of deionized water according to the stoichiometric ratio, and use mechanical stirring to obtain a uniform reaction solution; then press LiNiO 2 Adding molar percentages (0, 10, 20, 40 mol%), lithium acetate and nickel acetate are added to the reaction solution; the reaction solution is sprayed and pyrolyzed to obtain the precursor. The resulting precursor was heat-treated at 900 °C for 10 hours to obtain LiNiO 2 Doped 0.5Li 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2 The positive electrode materials are respectively marked as LiNiO2-0, LiNiO2-5, LiNiO2-10, LiNiO2-20, LiNiO2-40.

[0050] LNCMO-LiNiO 2 The positive electrode material and the binder are mixed in a certain proportion, and magnetically stirred for 4 hours to obtain a uniform slurry, and then the slurry is evenly coate

[0055] Preparation of LiNiO by Spray Pyrolysis 2 doped with 0.7Li 2 MnO 3 -0.3LiNi 0.33 co 0.33 mn 0.33 o 2 (LNCMO-1) cathode material

[0056] Add Li, Ni, Co, Mn acetate into a certain amount of deionized water according to the stoichiometric ratio, and use mechanical stirring to obtain a uniform reaction solution; then press LiNiO 2 Adding mole percentages (0, 10, 20, 40 mol%), lithium acetate and nickel acetate are added to the reaction solution; the reaction solution is sprayed and pyrolyzed to obtain a precursor. The resulting precursor was heat-treated at 900 °C for 10 hours to obtain LiNiO 2 The doped LNCMO-1 cathode materials are labeled LiNiO2-1-0, LiNiO2-1-5, LiNiO2-1-10, LiNiO2-1-20, LiNiO2-1-40, respectively.

[0057] Electrode material preparation and battery assembly are the same as in Example 1.

[0058] Figure 4 (a) is the cycle performance curve of LiNiO2-1-0, LiNiO2-1-5, LiNiO2-1-10, LiNiO2-1-20, LiNiO2-1-40 electrode materials. As shown, increasing

[0060] Preparation of LiNiO by Spray Pyrolysis 2 Doped with 0.5Li 2 MnO 3 -0.5LiNi 0.33 co 0.33 mn 0.33 o 2(LNCMO) Cathode Material - Nitrate

[0061] Add Li, Ni, Co, and Mn nitrates into a certain amount of deionized water according to the stoichiometric ratio, and use mechanical stirring to obtain a uniform reaction solution; then press LiNiO 2 Adding mole percentages (0, 10, 20, 40 mol%), lithium nitrate and nickel nitrate are added to the reaction solution; the reaction solution is sprayed and pyrolyzed to obtain a precursor. The resulting precursor was heat-treated at 900 °C for 10 hours to obtain LiNiO 2 The doped LNCMO cathode materials are labeled LiNiO2-2-0, LiNiO2-2-5, LiNiO2-2-10, LiNiO2-2-20, LiNiO2-2-40, respectively.

[0062] Electrode preparation and battery assembly are the same as in Example 1.

[0063] Figure 5 Shown are the XRD patterns of LiNiO2-0, LiNiO2-5, LiNiO2-10, LiNiO2-20, LiNiO2-40 electrode materials. Such as Figure 5 As shown, all the d