Method for preparing slurry composition for electrode of secondary cell
A secondary battery and composition technology, applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve problems such as excessive viscosity changes, low adhesion, and insufficient adhesive dispersion
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preparation example Construction
[0012] The preparation method of the slurry composition for secondary battery electrodes of the present invention comprises: A ) The solvent (S) of the polymer (A) having an insoluble component of 50% by weight or more A ) dispersion and electrode active material mixing, then the resulting mixing solution and polymer (B) solvent (S B ) solution for mixing.
[0013] First, materials used in the present invention will be described.
[0014] As the solvent used in the present invention (S A ) and solvent (S B ), preferably water and a non-aqueous solvent having a boiling point of 80 to 350° C. under atmospheric pressure. The non-aqueous solvent can be exemplified, for example, amides such as N-methylpyrrolidone, dimethylformamide, dimethylacetamide; hydrocarbons such as toluene, xylene, n-dodecane, tetrahydronaphthalene; 2- Ethyl-1-hexanol, 1-nonanol, lauryl alcohol and other alcohols; methyl ethyl ketone, cyclohexanone, phorone, acetophenone, isophorone and other ketones; b...
Embodiment 1
[0110] Disperse 0.4 parts of polymer A-1 in 15.6 parts of NMP dispersion, and 100 parts of lithium cobaltate (LiCoO 2 , active substance (i), liquid absorption 15.6g), kneaded for 60 minutes with a planetary mixer with two pairs of helical stirring blades, and prepared mixed solution a. The solid component concentration of the mixed solution a was 86.6%. In addition, to a solution in which 0.2 parts of polymer B-1 and 0.2 parts of polymer B-3 were dissolved in 6.3 parts of NMP, 3 parts of a conductivity-imparting agent, acetylene carbon black (denka black granular form manufactured by Denki Kagaku Kogyo Co., Ltd.) was added. , the solid component concentration is 35.1%, is kneaded with the same planetary mixer as above, and 1.8 parts of NMP is added to make a mixed solution b with a solid component concentration of 29.6%. Add the mixed solution b to the mixed solution a with the planetary mixer, and knead for 30 minutes to prepare the slurry composition for the positive elect...
Embodiment 2～6
[0113] According to composition and quantity shown in table 2, the same method as embodiment 1 prepares slurry composition. When preparing the mixed solution b, among the NMP amounts recorded in the table, 6.3 parts were first added when dissolving the polymer (B), and the remaining amount was added after mixing with the conductivity-imparting agent. However, in Example 3, the entire amount recorded in the table was added when dissolving the polymer (B). The characteristics of the slurry composition, the secondary battery electrode made with the slurry composition, and the secondary battery were tested. The test results are shown in Table 2.
[0114] Example
1
2
3
4
5
6
active substance
type * 1
Amount added (parts)
i
100
i
100
i
100
i
100
iii
100
i
100
polymer
(A)
type
Amount added (parts)
...
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Abstract
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