a ti 4+ ,al 3+ ,fe 3+ ,f - Co-doped composite lithium-rich cathode material and preparation method
A lithium-rich cathode material and co-doping technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as incomplete understanding of the mechanism of action, and achieve reduced irreversible capacity loss, high ionic conductivity, and good cycle capacity retention effect of ability
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Embodiment 1
[0012] Example 1: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O: butyl titanate: Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 1.073: 0.5365: 0.4365: 0.009: 0.009: 0.009: 0.009 (molar ratio) ratio is evenly mixed, joins in deionized water, the amount of substance added is the tartaric acid that the total amount of all metal ions is 2.5 times and fully stirs to Dissolve completely; raise the temperature of the system to 70°C and continue to stir until 71% of the water evaporates, at this time the solution gradually becomes viscous and forms a jelly. The jelly-like substance was dried in an oven at 130° C. for 22 hours and then ground in a mortar for 10 minutes. The obtained powder was heated up to 500°C at a rate of 2°C / min in a tube furnace and calcined at this temperature for 3 hours. After cooling, the powder was taken out and continued to grind in a mortar for 10 minutes, and the powder was pressed with a pressure of 100MPa. After being formed into a shee...
Embodiment 2
[0013] Example 2: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O: butyl titanate: Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 1.415: 0.7125: 0.2125: 0.025: 0.025: 0.025: 0.03 (molar ratio) ratio is evenly mixed, joins deionized water, the amount of substance added is the tartaric acid of all metal ion total amount 4.0 times fully stirs to Dissolve completely; raise the temperature of the system to 85°C and continue to stir until 85% of the water evaporates, then the solution gradually becomes viscous and forms a jelly. The jelly-like mass was dried in an oven at 200° C. for 48 hours and then ground in a mortar for 30 minutes. The obtained powder was heated up to 600°C at a rate of 10°C / min in a tube furnace and calcined at this temperature for 5 hours. After cooling, the powder was taken out and continued to grind in a mortar for 30 minutes, and the powder was pressed with a pressure of 300MPa. It was formed into a sheet, and then calcined in a tube furnace...
Embodiment 3
[0014] Embodiment 3: LiNO 3 :Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O: butyl titanate: Fe(NO 3 ) 3 9H 2 O:Al(NO 3 ) 3 9H 2 O: LiF is 1.136: 0.576: 0.376: 0.016: 0.016: 0.016: 0.024 (molar ratio) ratio is evenly mixed, joins in deionized water, the amount of substance added is the tartaric acid that the total amount of all metal ions is 3.2 times and fully stirs until Dissolve completely; raise the temperature of the system to 78°C and continue to stir until 78% of the water evaporates, at this time the solution gradually becomes viscous and forms a jelly. The jelly-like mass was dried in an oven at 170° C. for 35 hours and then ground in a mortar for 20 minutes. The obtained powder was heated up to 550°C at a rate of 7°C / min in a tube furnace and calcined at this temperature for 4 hours. After cooling, the powder was taken out and continued to grind in a mortar for 20 minutes, and the powder was pressed with a pressure of 200MPa. After being formed into a sheet...
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