Silicon-containing negative plate and lithium ion battery comprising same
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A lithium-ion battery and negative electrode technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large electrolyte wettability, and achieve the effects of improving hydrophilicity, increasing energy density, and improving wettability
Pending Publication Date: 2021-03-09
ZHUHAI COSMX BATTERY CO LTD
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However, the contact angle between pure silicon oxide particles and non-aqueous solvent is too small, and coating it on the surface of the electrode sheet will make the wettability of the electrolyte too large
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Embodiment 1
[0059] Such as figure 1 As shown, this embodiment provides a negative electrode sheet, including a current collector 3, a first active layer 1, and a second active layer 2, and the second active layer 2 is arranged on the current collector 3 and the first active layer 1, the second active layer 2 is formed on both surfaces of the current collector 3 .
[0060] Wherein, the active material in the first active layer is graphite and silicon-oxygen material, the active material in the second active layer is graphite, and the current collector is composed of carbon-coated copper foil.
[0061] Preparation of lithium ion battery negative electrode sheet:
[0062] Mix the active material with conductive agent, dispersant, and binder according to the mass ratio of 93%: 1.1%: 0.9%: 5%, and then disperse them in the water solvent to make the first active layer slurry; wherein, the active material is composed of The weight percentage is composed of 60% graphite and 40% silicon-oxygen m...
Embodiment 2
[0073] The difference between the negative electrode sheet and its preparation method and the lithium-ion battery provided in this example and Example 1 is that the active material in the first active layer is composed of 70% by weight of graphite and 30% of silicon oxide, so The active material, conductive agent, dispersant, and binder in the first active layer 1 are in mass ratios of 94%:1.1%:0.9%:4%, and θ1 / a=250, θ2 / b=400.
[0074] Other conditions are all the same as in Example 1.
Embodiment 3
[0076] The difference between the negative electrode sheet and its preparation method and the lithium ion battery provided in this example and Example 1 is that the active material in the first active layer is composed of 80% by weight of graphite and 20% of silicon oxygen, and the first The active material, conductive agent, dispersant, and binder in the active layer 1 are in mass ratios of 94.5%: 1.1%: 0.9%: 3.5%, and θ1 / a=300, θ2 / b=400.
[0077] Other conditions are all the same as in Example 1.
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Abstract
The invention discloses a silicon-containing negative plate and a lithium ion battery comprising the same. The negative plate comprises a current collector, a first active layer and a second active layer, wherein the second active layer is arranged between the current collector and the first active layer, active substances in the first active layer are a silicon-oxygen material and graphite, and the second active layer is arranged between the first active layer and the second active layer, and the active substance in the second active layer is graphite. a contact angle between the first activelayer active substance and the non-aqueous solvent is theta 1, the porosity of the first active layer active substance is a, the contact angle between the bottom active substance and the non-aqueoussolvent is theta 2, and the porosity of the bottom active substance is b, so 100 <theta1/a<theta2/b<450 is obtained, through the above specific structure, as the silicon expands greatly during the charging and discharging process, it is beneficial to improve the porosity of the surface electrode plate so as to improve the liquid retention of the battery. and meanwhile, the silica surface containsmore functional groups, and the particles are smaller than the graphite particles, so that the energy density, the liquid retention capacity and the cycle life of the battery can be remarkably improved.
Description
technical field [0001] The invention relates to the field of batteries, in particular to a negative electrode sheet containing silicon and a lithium ion battery containing the negative electrode sheet. Background technique [0002] Nowadays, lithium-ion batteries have become the main energy storage devices for mainstream electronic products. With the improvement of people's requirements for battery performance, a lithium-ion battery with excellent performance must not only have a high energy density, but also need to take into account a long cycle life. At present, the energy density of the battery is increased mainly by increasing the compactness of the pole piece to reduce the thickness of the pole piece. However, high compaction will lead to low porosity of the pole piece, thereby reducing the liquid retention capacity of the battery. [0003] Due to its high gram capacity, the silicon-oxygen material can increase the energy density of the battery; at the same time, due ...
Claims
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