A kind of preparation method of gel state polymer lithium battery and battery
A polymer and lithium battery technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problems of poor cycle performance, low initial efficiency, large volume expansion, etc., and achieve good safety performance and good inhibition Expansion, the effect of inhibiting expansion
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Embodiment 1
[0040] The model of the prepared battery is 554065P / 2400mAh. The battery core adopts winding type and is packaged by aluminum-plastic film to form a polymer soft pack battery; the negative electrode active material is a mixed material of silicon carbon and artificial graphite, and the reversible capacity of the material after mixing is 450mAh / g, the first efficiency was 93.0%.
[0041] (1) Preparation of positive and negative pole pieces:
[0042] Mix 95.8 wt % of negative electrode active material, 1.0 wt % of S-P, 1.4 wt % of sodium carboxymethyl cellulose, 1.8 wt % of styrene-butadiene rubber and solvent water to form a slurry, and evenly coat it on 8 μm copper foil , the coating surface density is 194g / m on both sides 2 , after baking, rolling, and welding the tabs, the negative pole piece is made, and the negative pole piece is compacted to 1.65g / cm 3 .
[0043] 98 wt % lithium cobaltate, 0.5 wt % carbon nanotubes, 1.2 wt % polyvinylidene fluoride and N-methylpyrrolid...
Embodiment 2
[0066] The model of the prepared battery is P7090130 / 11.0Ah, and the cell is laminated, and is packaged by aluminum-plastic film to form a polymer soft pack battery; the negative electrode active material is a mixed material of silicon carbon, artificial graphite and mesocarbon microspheres, The mass percentage of artificial graphite in artificial graphite and mesocarbon microspheres is 60%, the material capacity after mixing is 650mAh / g, and the initial efficiency is 91.3%.
[0067] (1) Preparation of positive and negative pole pieces:
[0068] Mix 94.5% negative electrode active material, 2.0wt% S-P, 1.5wt% sodium carboxymethyl cellulose, 2.0wt% styrene-butadiene rubber and solvent water to form a slurry, and evenly coat it on a 10 μm copper foil, Coating surface density is 103.5g / m on both sides 2 , after baking, rolling, and welding the tabs, the negative pole piece is made, and the negative pole piece is compacted to 1.55g / cm 3 .
[0069] Mix 94.5% nickel-cobalt lithiu...
Embodiment 3
[0084] Adopt the same method as Example 2 to prepare pole piece and battery, battery design capacity 9.5Ah, the difference is that negative electrode active material adopts silicon carbon, soft carbon and artificial graphite to form after mechanical mixing, and the material capacity after mixing is 500mAh / g, the first efficiency is 87%.
[0085] Negative electrode coated double-sided surface density is 122.0g / m 2 , the density of both sides of the positive electrode coating is 363.4g / m 2 .
[0086] The actual capacity of the battery is about 9.5Ah, the positive electrode 1C gram capacity is greater than 153mAh / g, the negative electrode 1C gram capacity is more than 435mAh / g, and the first efficiency is greater than 86%.
[0087] The cycle life of the battery was tested by the same method as in Example 2. The 900-cycle capacity retention rate was greater than 79.0%, and the battery thickness expansion was less than 8%.
[0088] In the rate performance test, the 10C rate dis...
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