Modified lithium-rich manganese-based cathode material for lithium ion battery

[0023] (La 0.85 Sr 0.15 ) 0.9 MnO 3-δ Solution coated Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2

[0024] The coating content is 1wt% (La 0.85 Sr 0.15 ) 0.9 MnO 3-δ Take La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 3 , Manganese acetate is used as the coating raw material, and it is formulated into a clear solution with citrate according to the stoichiometric ratio, and the ratio of metal ions to citric acid is 1:1. Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 As the coating object, take 2g Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 Add the above solution, after ultrasonic dispersion, stir and heat to gel, dry the gel at 80°C for 5h, and treat at 850°C for 10h to obtain a certain amount of coated Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 . Li with a mass ratio of 80:10:10 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 The sample, conductive carbon black and polyvinylidene fluoride were evenly mixed to make a working electrode, and the negative electrode was a metal lithium sheet. The irreversible capaci

[0026] (La 0.85 Sr 0.15 ) 0.9 MnO 3-δ Solution coated Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2

[0027] Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 As a coating object, the coating content is 3wt% (La 0.85 Sr 0.15 )- 0.9 MnO 3- δ Take La(NO 3 ) 3 ·6H 2 O, Sr(NO3 ) 3 , manganese acetate as the coating raw material, a certain amount of citrate as a complexing agent, after drying at 80 ℃, calcined at 850 ℃ / 10h. Li with a mass ratio of 80:10:10 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 The sample, conductive carbon black and polyvinylidene fluoride were uniformly mixed to make a working electrode, and the negative electrode was prepared by buckling metal lithium sheet for testing. The same irreversible capacity loss decreased significantly.

[0029] (La 0.85 Sr 0.15 ) 0.9 MnO 3-δ Powder Mechanical Mixing and Coating Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2

[0030] Co-precipitated lithium-rich cathode material Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 As coating object, La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 3 , manganese acetate as coating material. The powder prepared by burning the above-mentioned nitrate with glycine method was pre-fired at 800°C and mechanically mixed with lithium-rich positive electrode materials, and then sintered at 850°C to prepare Li with a coating content of 1.5wt%. 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 Cathode material. Coated Li with a mass ratio of 80:10:10 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 The sample, conductive carbon black and polyvinylidene fluoride were evenly mixed to make a working electrode, and the negative electrode was a metal lithium sheet. figure 1 for (La 0.85 Sr 0.15 ) 0.9 MnO 3- δ Coated Li 1.2 mn 0.54 co 0.13 Ni 0.13 0 2 The subsequent charge and discharge curv