A method for coating and modifying cathode material of lithium ion battery
A lithium-ion battery and positive electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of restricting large-scale production and application, poor rate performance and cycle stability, etc., to improve cycle stability, Improved high-magnification performance and easy-to-control parameters
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Embodiment 1
[0021] (1) Dissolve 2-methylimidazole in 200mL of methanol solution, the concentration of 2-methylimidazole is 320mmol / L, stir to obtain a clear solution, then add 800mmol of LiNi 0.6 co 0.2 mn 0.2 o 2 Positive electrode material, stir to obtain suspension A; Co(NO 3 ) 2 ·6H 2 O dissolved in 200mL methanol, Co(NO 3 ) 2 ·6H 2 The concentration of O was 80mmol / L, and solution B was obtained.
[0022] (2) Add solution B prepared in step (1) to suspension A dropwise, and stir at room temperature for 24 hours.
[0023] (3) Suction filter the turbid liquid after the reaction in step (2), vacuum-dry the filter cake at 80°C for 24 hours, pass through a 300-mesh sieve after grinding, raise the temperature from room temperature to 700°C at a rate of 5°C / min, and keep it warm for 2 hours 1. Obtain the coated lithium-ion battery positive electrode material after natural cooling.
[0024] The XRD image of ZIF-67@Co obtained in the present embodiment is as follows figure 1 , it c...
Embodiment 2
[0026] (1) Dissolve 2-methylimidazole in 200mL methanol solution, the concentration of 2-methylimidazole is 280mmol / L, stir to obtain a clear solution, then add 800mmol of LiNi 0.6 co 0.2 mn 0.2 o 2 Positive electrode material, stir to obtain suspension A; Co(NO 3 ) 2 ·6H 2 O dissolved in 200mL methanol, Co(NO 3 ) 2 ·6H 2 The concentration of O was 90mmol / L, and solution B was obtained.
[0027] (2) Add solution B prepared in step (1) to suspension A dropwise, and stir at room temperature for 18 hours.
[0028] (3) Suction filter the turbid liquid after the reaction in step (2), vacuum-dry the filter cake at 80°C for 24 hours, pass through a 300-mesh sieve after grinding, raise the temperature from room temperature to 650°C at 10°C / min, and keep it warm for 4 hours 1. Obtain the coated lithium-ion battery positive electrode material after natural cooling. There is a certain range of coating layers on the surface of the coating material prepared in this example, the m...
Embodiment 3
[0030] (1) Dissolve 2-methylimidazole in 200mL of methanol solution, the concentration of 2-methylimidazole is 360mmol / L, stir to obtain a clear solution, then add 900mmol of LiNi 0.6 co 0.2 mn 0.2 o 2 Positive electrode material, stir to obtain suspension A; Co(NO 3 ) 2 ·6H 2 O dissolved in 200mL methanol, Co(NO 3 ) 2 ·6H 2 The concentration of O was 70mmol / L, and solution B was obtained.
[0031] (2) Add solution B prepared in step (1) to suspension A dropwise, and stir at room temperature for 30 hours.
[0032] (3) Suction filter the turbid liquid after the reaction in step (2), vacuum-dry the filter cake at 80°C for 24 hours, pass through a 300-mesh sieve after grinding, raise the temperature from room temperature to 750°C at a rate of 7°C / min, and keep it warm for 2 hours 1. Obtain the coated lithium-ion battery positive electrode material after natural cooling. The structure of the coating material prepared in this example has not changed, the coating layer mat...
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