Power polymer lithium ion battery and fabricating process thereof
A lithium-ion battery and polymer technology, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as low bulk density and tap density, difficulty in coating positive electrode slurry, and slow diffusion of lithium ions. , to achieve the effect of high rate charge and discharge performance improvement, high rate performance improvement, uniform and full contact
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[0033] Example one:
[0034] The manufacturing steps of Example 1 are roughly the same as the above-mentioned embodiments, except that the weight percentage of each component is determined. In the step 1, the modified lithium iron phosphate is 86.5%, KS-6 conductive agent 4%, and Super-p conductive agent 4%, Hypermer KD-1 dispersant 0.5%, mix, grind, dry, then add 5% of PVDFHSV900 positive electrode binder, then add 0.5% of Hypermer KD-1 dispersant and stir to prepare positive electrode slurry. The viscosity is 10000~15000mPa·s, and the slurry is coated on both sides of the aluminum foil. After drying at 110°C, roll pressing, and forming a pole piece with a thickness of 135μm after roll pressing, with a compacted density of 2.3g / cm 3 , Get the positive electrode sheet. In the second step, 95% of artificial graphite is added to the deionized water solution containing 8% of LA132 negative electrode binder to prepare negative electrode slurry. The viscosity of the slurry should be 20...
Example Embodiment
[0036] Embodiment two:
[0037]The manufacturing steps of the second embodiment are roughly the same as those of the first embodiment, but the difference is the weight percentage of each component of the positive electrode slurry. In the first step, the modified lithium iron phosphate 80%, the KS-6 conductive agent 8%, and the Super-p Conductive agent 2%, mix, grind, dry, add a colloid made by mixing 10% of 761PVDF positive electrode binder and NMP, and stir to prepare positive electrode slurry.
[0038] Such as image 3 Shown is the 1C charging and discharging cycle life of the power polymer lithium-ion battery of Example 2 of the present invention. After testing, the charging and discharging voltage is 2.2-3.8V, and the discharge is at 1C. The discharge platform is 3.2V, the battery capacity is about 4300mAh, and the cycle is 450. The weekly capacity retention rate was 91.3%.
[0039] By comparing the first embodiment with the second embodiment, it can be found that the weight pe...
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