Negative plate and application thereof
A technology of negative electrode sheet and negative electrode, applied to the negative electrode sheet and its application field, can solve the problems of high current density, prone to lithium precipitation, insufficient setting of negative electrode active layer, etc., so as to improve the cycle life, improve the charging and discharging speed, reduce The effect of temperature rise
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[0064] The preparation method of negative electrode sheet in some embodiments of the present invention comprises the following steps:
[0065] 1) preparing the first negative electrode active slurry and the second negative electrode active slurry;
[0066] 2) On the first direction of the functional surface of the negative electrode current collector, the first negative electrode active slurry and the second negative electrode active slurry are sequentially arranged, and after drying, rolling, and slitting, the first negative electrode active layer and the second negative electrode active layer are obtained. layer negative electrode sheet;
[0067] Wherein, in step 2), the first negative electrode active slurry includes a conductive agent, the first negative electrode active material and a binder; the second negative electrode active slurry includes a conductive agent, a second negative electrode active material and a binder, and the second negative electrode The ratio of the...
Embodiment 1
[0106] The lithium-ion battery of this embodiment is prepared by a method comprising the following steps:
[0107] 1) Preparation of negative electrode sheet
[0108] A. Prepare the first negative electrode active slurry
[0109] With deionized water as solvent, sodium carboxymethyl cellulose (CMCNa) is the first thickener prepared as solute; Add conductive carbon black and artificial graphite to the first thickener under high-speed stirring, then mix uniformly to obtain mixed Slurry; then reduce the stirring speed, add styrene-butadiene rubber binder to the mixed slurry, mix evenly, obtain the first negative electrode active slurry;
[0110] Among them, the solid content of the first thickener is 1.6%, the D50 of the artificial graphite is 9 μm, and the diffusion coefficient of the artificial graphite is 1.1×10 -10 cm 2 the s -1 ; The mass ratio of CMCNa, conductive carbon black, artificial graphite, and styrene-butadiene rubber is: 1.0:0.9:97:1.1.
[0111] B. Preparatio...
Embodiment 2
[0131] The preparation method of the lithium ion battery of this embodiment is basically the same as that of Example 1, the only difference is that the lithium titanate in the second negative electrode active slurry in step 1) is replaced by lithium vanadate, the diffusion coefficient of lithium vanadate 3.1×10 -9 cm 2 the s -1 ;
[0132] The ratio of the diffusion coefficient of the second negative electrode active material to the diffusion coefficient of the first negative electrode active material is 28.18.
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