A method for improving lithium-ion battery ternary positive electrode material by oxygen-absorbing self-healing film
A technology for lithium-ion batteries and positive electrode materials, which is applied in the direction of battery electrodes, positive electrodes, electrical components, etc., can solve problems such as uneven surface coating, achieve the effects of improving interface stability, high safety performance, and improving battery safety
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Embodiment 1
[0027] Prepare pyrogallol and polyethyleneimine into solutions with a mass fraction of 0.2%, and mix the above solutions uniformly at a volume of 1:1 under an argon atmosphere, and mix 1gLiNi 0.88 co 0.06 mn 0.06 o 2 The material was added into 20 g of the mixed solution and stirred for 20 minutes to make it uniformly dispersed. Under continuous stirring, oxygen was introduced into the solution at a rate of 10 ml / min for 30 min. The solution is freeze-dried, washed with ethanol, filtered, and vacuum-dried to obtain a coated lithium-ion battery ternary positive electrode material.
[0028] The physicochemical performance characterization of the obtained coated positive electrode material is shown in figure 1 , figure 2 , image 3 .
[0029] from figure 1 The XRD results show that the crystal structure of the ternary material is intact before and after coating, which indicates that the coating process will not affect the structure of the material. Since the nano-film is...
Embodiment 2
[0033] Catechol and ethylenediamine were respectively configured into a solution with a mass fraction of 0.05%, and the above solutions were mixed uniformly at a volume of 1:2 under an argon atmosphere, and 0.5g LiNi 0.85 co 0.075 mn 0.075 o 2The material was added into 20 g of the mixed solution and stirred for 20 minutes to make it uniformly dispersed. Under continuous stirring, oxygen gas was passed into the solution at a rate of 1 ml / min for 180 min. The coated positive electrode material is obtained after the solution is freeze-dried.
[0034] The positive electrode material after the resulting coating is assembled into a coin cell, such as Figure 4 As shown, the pristine LiNi 0.85 co 0.075 mn 0.075 o 2 Material from 181.2mA g -1 Attenuates to 149.5mA g -1 , the capacity retention rate was 82.5%; the cycle stability of the coated material was significantly improved, from the initial capacity of 182.2mA g -1 Attenuates to 173.6mA g -1 , The capacity retention ...
Embodiment 3
[0036] Prepare pyrogallol and polyethyleneimine respectively as a solution with a mass fraction of 10%, and mix the above solutions uniformly at a volume of 1:1 under an argon atmosphere, and mix 1 g of LiNi 0.8 co 0.1 mn 0.1 o 2 The material was added to 50 g of the mixed solution and stirred for 20 minutes to make it uniformly dispersed. Under continuous stirring, oxygen gas was passed into the solution at a rate of 20ml / min for 10min. The solution was freeze-dried, washed with ethanol and filtered to obtain the coated ternary positive electrode material.
[0037] In order to verify the storage performance of the material, the material before and after coating was exposed to the air for 10 days. Get above-mentioned material and measure and show lithium hydroxide and lithium carbonate content, the lithium hydroxide and lithium carbonate that coating material shows are respectively 1351 and 684ppm, and the lithium hydroxide and lithium carbonate of uncoated material are re...
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