A method and device for gas-phase carbon coating of lithium battery positive electrode materials
A technology for positive electrode materials and lithium batteries, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems that the surface of positive electrode materials cannot be completely covered, and achieve the effect of improving rate performance, increasing capacity, and low cost
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Embodiment 1
[0037] The effective height H of the reaction chamber is 5m, and the cross-sectional area is 1m 2 . The interior is fed with a 700°C nitrogen + CO mixed gas flow from bottom to top, of which the nitrogen flow rate is 0.95m 3 / min, CO gas flow rate is 0.05m 3 / minute. The finished 523-type ternary cathode material powder is sent into the reaction chamber at a feeding speed of 5Kg / min. After being dispersed by a 100-mesh vibrating sieve, the powder falls slowly. During the falling process, CO splits on the surface of the ternary material to form a thin carbon film. After the material falls into the collection bin, it is discharged through the finished product conveying pipe. The finished conveying pipe has a cooling effect, which can cool the high-temperature material to below 100°C.
[0038] The 3.6V, 2200mAh 18650 lithium-ion battery is manufactured with this ternary material, and the internal resistance of the battery is reduced from 30mΩ to 21mΩ, which has an obvious e...
Embodiment 2
[0040] The effective height H of the reaction chamber is 15m, and the cross-sectional area is 5m 2 . Argon + CH at 750°C is passed through the interior from bottom to top 4 Mixed air flow, in which the flow rate of argon is 23.25m 3 / min, CH 4 The air flow is 1.25m 3 / minute. The crushed lithium iron phosphate finished product is sent into the reaction chamber at a feeding speed of 50Kg / min. After being dispersed by a 300-mesh vibrating sieve, the powder falls slowly. During the fall, CH 4A thin carbon film is formed by cracking on the surface of lithium iron phosphate material. After falling into the collection bin, it is discharged through the finished product conveying pipe. The finished conveying pipe has a cooling effect, which can cool the high-temperature material to below 100°C. The material has a good carbon coating on the surface, and the structure is smooth. For the corresponding electron micrographs, see figure 2 . However, ordinary untreated lithium i...
Embodiment 3
[0043] The effective height H of the reaction chamber is 8m, and the cross-sectional area is 10m 2 . Helium+CH at 575°C is fed from bottom to top inside 4 Mixed gas flow, in which the flow rate of argon gas is 19.6m 3 / min, CH 4 The air flow is 0.4m 3 / minute. The lithium manganate material is sent into the reaction chamber at a feeding speed of 80Kg / min. After being dispersed by a 150-mesh vibrating sieve, the powder falls slowly. The powder falls slowly. During the fall, CH 4 A thin carbon film is formed by cracking on the surface of lithium manganate material. After falling into the collection bin, it is discharged through the finished product conveying pipe. The finished conveying pipe has a cooling effect, which can cool the high-temperature material to below 100°C.
[0044] The lithium manganese oxide material is used to manufacture a 10Ah square aluminum shell battery, and the internal resistance of the battery is reduced from the original 5mΩ to about 3.5mΩ, ...
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Abstract
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