Lithium ion battery negative plate, preparation method thereof and lithium ion battery
A lithium-ion battery and negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unfavorable cell rate discharge performance, low-temperature charge-discharge performance and long-term cycle performance, weak affinity with electrolyte, The problem of poor liquid absorption effect of the pole piece can achieve the effect of improving the rate charge and discharge performance, reducing the conductivity and increasing the affinity.
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Embodiment 1
[0021] (1) Negative plate preparation: According to the solid weight ratio, graphite (C): conductive agent (SP): acrylic acid polymer is mixed according to the ratio of 96.9%: 0.5%: 2.6%, and a uniformly dispersed negative electrode slurry is obtained by high-speed stirring , the negative electrode slurry is evenly coated on both sides of the copper foil, and the negative electrode sheet is obtained through drying, rolling and cutting. The negative electrode slurry is evenly coated on both sides of the copper foil, and the negative electrode sheet is obtained after drying, rolling, and cutting. Among them, the relative molecular mass of the dispersant is 500-5000, the relative molecular mass of the binder is 5000-1,000,000, the relative molecular mass of the thickener is greater than 1,000,000, the dispersant acrylic polymer, the binder acrylic polymer and the thickener The mass percent of the agent acrylic acid polymer is 0.3%: 1.3%: 1.0%.
[0022] (2) Positive plate prepara...
Embodiment 2
[0026] Different from Example 1 is the preparation of negative electrode sheet:
[0027] According to the solid weight ratio, graphite (C): conductive agent (SP): acrylic acid polymer is mixed according to the ratio of 96.9%: 0.5%: 2.6%, and a uniformly dispersed negative electrode slurry is obtained by high-speed stirring, and the negative electrode slurry is evenly coated. On both sides of the copper foil, the negative electrode sheet is obtained through drying, rolling, and slitting. The negative electrode slurry is evenly coated on both sides of the copper foil, and the negative electrode sheet is obtained after drying, rolling, and cutting. Among them, the relative molecular mass of the dispersant is 500-5000, the relative molecular mass of the binder is 5000-1,000,000, the relative molecular mass of the thickener is greater than 1,000,000, the dispersant acrylic polymer, the binder acrylic polymer and the thickener The mass percentage of the agent acrylic acid polymer i...
Embodiment 3
[0030] Different from Example 1 is the preparation of negative electrode sheet:
[0031] According to the solid weight ratio, graphite (C): conductive agent (SP): acrylic acid polymer is mixed according to the ratio of 96.9%: 0.5%: 2.6%, and a uniformly dispersed negative electrode slurry is obtained by high-speed stirring, and the negative electrode slurry is evenly coated. On both sides of the copper foil, the negative electrode sheet is obtained through drying, rolling, and slitting. The negative electrode slurry is evenly coated on both sides of the copper foil, and the negative electrode sheet is obtained after drying, rolling, and cutting. Wherein, the mass percent of dispersant acrylic polymer, binder acrylic polymer and thickener acrylic polymer is 0.5%: 1.3%: 0.8%.
[0032] The rest are the same as in Embodiment 1, and will not be repeated here.
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