Negative electrode sheet and secondary battery and device containing it
A technology of negative pole piece and negative pole, applied in the field of electrochemistry, can solve problems such as battery performance deterioration, and achieve the effect of good cycle performance and rate performance
Active Publication Date: 2022-02-11
CONTEMPORARY AMPEREX TECH CO
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- Abstract
- Description
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- Application Information
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Problems solved by technology
However, the technical means used in the prior art to improve the energy density of the battery often lead to the deterioration of other aspects of the performance of the battery
Method used
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Experimental program
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Effect test
Embodiment 1
[0075] 1) Preparation of positive electrode sheet
[0076] The lithium nickel cobalt manganese ternary active material LiNi 0.5 co 0.2 mn 0.3 o 2 (NCM523) and conductive carbon black Super-P, binder polyvinylidene fluoride (PVDF) in a weight ratio of 94:3:3 in N-methylpyrrolidone solvent after fully stirring and mixing, the slurry is coated on On the aluminum foil substrate, the positive electrode sheet is obtained by drying, cold pressing, slitting, and cutting.
[0077] 2) Preparation of negative electrode sheet
[0078] The first negative electrode active material natural graphite, conductive carbon black Super-P, binder styrene-butadiene rubber (SBR), thickener carbon methyl cellulose sodium (CMC) are removed according to the weight ratio 96:1:2:1 Thoroughly stir and mix in deionized water to obtain the first negative electrode active material slurry, apply the first negative electrode active material slurry on the copper foil of the negative electrode current collector...
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Abstract
The application relates to a negative electrode sheet and a secondary battery and a device containing it. Specifically, the application provides a negative electrode sheet, including a negative electrode collector and a negative electrode film layer disposed on at least one surface of the negative electrode collector, the negative electrode film layer includes a first negative electrode film layer and a second negative electrode film layer, the first negative electrode film layer includes a first negative electrode active material and is arranged on at least one surface of the negative electrode current collector, and the second negative electrode film layer includes a second negative electrode active material and is arranged on the first negative electrode film layer, The first negative electrode active material includes natural graphite, and the OI value of the first negative electrode film layer is 10 to 35; the second negative electrode active material includes artificial graphite, and the OI value of the second negative electrode film layer is 2 to 15. The negative pole sheet can make the secondary battery containing it have good rate performance and long cycle life.
Description
technical field [0001] The application belongs to the technical field of electrochemistry, and more specifically, the application relates to a negative electrode sheet and a secondary battery and a device containing it. Background technique [0002] New energy vehicles represent the development direction of the world's automobile industry. As a new type of high-voltage, high-energy-density power battery, lithium-ion secondary batteries have outstanding features such as light weight, high energy density, no pollution, no memory effect, and long service life, so they are widely used in new energy vehicles. [0003] As the demand for the power battery market gradually expands, the demand for the energy density of the power battery is also getting higher and higher. However, the technical means used in the prior art to improve the energy density of the battery often lead to deterioration of other aspects of the performance of the battery. Therefore, there is an urgent need for...
Claims
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IPC IPC(8): H01M50/249H01M50/258H01M4/66
CPCH01M4/667H01M4/663Y02E60/10
Inventor 张小文黄亚萍金海族林永寿
Owner CONTEMPORARY AMPEREX TECH CO