Binder and lithium ion battery using the binder
A binder and polyacrylic acid technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problem of insufficient adhesive force of the binder, to improve the interaction force, improve the mechanical properties and bond strength, Solve the effect of poor long-term cycle stability
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[0056] As previously mentioned, the present invention also provides a method for preparing the above-mentioned binder, which comprises the steps of:
[0057] (1) dissolving the benzimidazole polymer in an organic solvent to obtain a solution of the benzimidazole polymer;
[0058] (2) adding polyacrylic acid into the above solution and reacting under heating conditions; preparing the binder.
[0059] In step (1), the organic solvent is one or more of the following: DMF (N,N-dimethylformamide), DMAc (N,N-dimethylacetamide), DMSO ( Dimethyl sulfoxide), NMP (N,N-dimethylpyrrolidone).
[0060] In step (1), the benzimidazole polymer can be purchased from a commercial source, or can be prepared by methods known in the art. The polyacrylic acid can be purchased from commercial sources, or can be prepared by methods known in the art.
[0061] In step (2), the mass ratio of the benzimidazole polymer to polyacrylic acid is 0.5:99.5-20:80, preferably 0.5:99.5-6:94, for example 0.5:99.5...
Embodiment 1
[0102] Binder preparation: 1g mPBI (molecular weight 250kDa) is dissolved in 19g DMAc to obtain a 5% solution, 10gPAA (molecular weight 1.5 million) is dissolved in 190g DMAc to obtain a 5% solution, according to the mass ratio of mPBI and PAA is 0.5: 99.5, the two solutions were mixed and then reacted at 150 ° C for 8 hours to obtain PAA 99.5 -g-mPBI 0.5 The adhesive has a viscosity of 3700mPa·s at 25°C.
[0103] Negative sheet preparation: the silicon oxide of 20 mass parts, the graphite of 75 mass parts, the conductive agent carbon black of 2.0 mass parts, the conductive agent carbon nanotube of 1.0 mass parts, the above-mentioned binding agent of 2.0 mass parts, and solvent ( Control the viscosity of the slurry (3500-5500mPa·s) and mix well and evenly to prepare negative electrode slurry, and coat it on the surface of 6μm copper foil, then dry it at 110°C, roll it under 40 tons of pressure, and the compaction density is 1.5-1.7 g / cm 3 , to obtain the negative electrode ...
Embodiment 2
[0107] Binder preparation: the same as in Example 1, except that the mass ratio of mPBI to PAA is 1:99.
[0108] The preparation of pole piece and battery is the same as in Example 1.
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