Lithium-ion battery, battery pole piece and preparation method thereof
A battery pole piece and electrode active material technology, applied in the field of new energy, can solve problems such as the inability to meet the cycle performance of silicon-based negative electrode materials, achieve suppression of powder removal and/or separation from current collectors, improve cycle performance, and inhibit pole piece rebound Effect
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[0033] Reference figure 2 The method for preparing battery pole pieces in an embodiment of the present invention to prepare the above-mentioned battery pole pieces includes:
[0034] S1: Premix the electrode active material and the conductive agent according to the first mass ratio to obtain a mixed powder.
[0035] The pre-mixing improves the dispersion uniformity of the electrode active material and the conductive agent in the forming slurry. In this embodiment, the motor active material is preferably a silicon-based negative electrode material, and the conductive agent is preferably conductive black.
[0036] S2: Disperse the mixed powder in the solution of the vinyl chloride-acrylate copolymer, stir and mix uniformly to form a slurry with a specified solid content.
[0037] The specified solid content of the slurry in this embodiment is preferably in the range of 40 wt% to 50 wt%, which is beneficial for uniform coating of the slurry on the current collector. In this embodiment...
Embodiment 1
[0044] According to the active material of nano silicon oxide powder: conductive agent: thickener (CMC-Na): (SBR+vinyl chloride-acrylate copolymer; the average molecular weight of the vinyl chloride-acrylate copolymer is 400,000)=91.6%: 3 %: 1.4%: (3.0+1.0)% ratio, first make 1.5wt% glue with thickener and water for later use; pre-mix nano-silica powder active material and conductive agent for 20min under 20Hz revolution, add step by step Stir the thickener glue solution, stir at 2000 rpm for 90 minutes at high speed, then add SBR emulsion and vinyl chloride-acrylate copolymer solution, disperse at 1000 rpm for 30 minutes, vacuum reverse defoaming, and obtain a uniformly dispersed solid content of 45% by weight Dark gray slurry. The black-gray slurry was coated on copper foil, vacuum-baked at 100°C for 30 minutes, and then dried to roll to obtain a compaction density of 1.6~1.7g / cm 3 The negative plate.
[0045] The positive electrode material adopts the NCM523 system, and the t...
Embodiment 2
[0048] According to nano-silicon oxide powder active material: conductive agent: thickener (CMC): (SBR+vinyl chloride-acrylate copolymer; the average molecular weight of vinyl chloride-acrylate copolymer is 490,000)=91.6%: 3%: 1.4%: (2.0+2.0)% ratio, first prepare a dispersion of vinyl chloride-acrylate copolymer and thickener for later use; premix the active main material and conductive agent for 20 minutes under 20Hz revolution, and add the stirred dispersion step by step Stir at high speed at 2000 rpm for 90 minutes, then add SBR emulsion, disperse at low speed at 1000 rpm for 30 minutes, vacuum reverse defoaming, and obtain a uniformly dispersed black-gray slurry with a solid content of 40 wt%. The black-gray slurry was coated on copper foil, vacuum-baked at 120°C for 20 minutes, and dried to roll to obtain a compacted density of 1.6~1.7g / cm 3 The negative plate. Others were the same as in Example 1, and a lithium ion battery B was obtained.
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