Binder for lithium ion battery compound pole piece, preparation method for binder, compound pole piece, battery core, and lithium ion battery
A technology of lithium-ion batteries and binders, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as pole piece misalignment, achieve the effects of avoiding displacement, avoiding thermal runaway, and improving the uniformity of dispersion
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[0043] Example 1
[0044] The binder for the lithium ion battery composite pole piece in this embodiment is composed of the following components by weight: 1 part of ethylene-vinyl acetate copolymer, 120 parts of barium sulfate particles, and 1.2 parts of thickener carboxymethyl Sodium cellulose and 98.8 parts of water, wherein the particle size D50 of the barium sulfate particles is 0.3 μm.
[0045] The preparation method of the binder for the above-mentioned lithium ion battery composite pole piece comprises the following steps:
[0046] 1) adding sodium carboxymethyl cellulose into water to make sodium carboxymethyl cellulose aqueous solution;
[0047]2) adding an ethylene-vinyl acetate copolymer emulsion with a solid content of 40% to the sodium carboxymethyl cellulose aqueous solution obtained in step 1), and stirring for 2h to obtain a mixed solution;
[0048] 3) adding barium sulfate particles to the mixed solution obtained in step 2), stirring for 5h, vacuum defoamin...
Example Embodiment
[0054] Example 2
[0055] The binder for the composite pole piece of the lithium ion battery in this embodiment is composed of the following components in parts by weight: 0.5 part of ethylene-vinyl acetate copolymer, 100 parts of barium sulfate particles, and 1 part of thickener carboxymethyl Sodium cellulose and 99 parts of water, wherein the particle size D50 of the barium sulfate particles is 0.3 μm.
[0056] The preparation method of the binder for the above-mentioned lithium ion battery composite pole piece comprises the following steps:
[0057] 1) adding sodium carboxymethyl cellulose into water to make sodium carboxymethyl cellulose aqueous solution;
[0058] 2) adding the ethylene-vinyl acetate copolymer emulsion with a solid content of 38% to the sodium carboxymethyl cellulose aqueous solution obtained in step 1), and stirring for 2h to obtain a mixed solution;
[0059] 3) adding barium sulfate particles to the mixed solution obtained in step 2), stirring for 8h, ...
Example Embodiment
[0065] Example 3
[0066] The binder for the composite pole piece of the lithium ion battery in this embodiment is composed of the following components in parts by weight: 1.5 parts of ethylene-vinyl acetate copolymer, 150 parts of barium sulfate particles, and 1.5 parts of thickener carboxymethyl Sodium cellulose and 98.5 parts of water, wherein the particle size D50 of the barium sulfate particles is 0.3 μm.
[0067] The preparation method of the binder for the above-mentioned lithium ion battery composite pole piece comprises the following steps:
[0068] 1) adding sodium carboxymethyl cellulose into water to make sodium carboxymethyl cellulose aqueous solution;
[0069] 2) adding an ethylene-vinyl acetate copolymer emulsion with a solid content of 45% to the sodium carboxymethyl cellulose aqueous solution obtained in step 1), and stirring for 2h to obtain a mixed solution;
[0070] 3) adding barium sulfate particles to the mixed solution obtained in step 2), stirring for...
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