Aggregate material, non-metal current collector and preparation method and application of non-metal current collector
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A current collector and aggregate technology, applied in the field of aggregate materials, can solve the problems of low mechanical strength, difficult to apply to lithium ion batteries, etc., and achieve the effects of good electrical conductivity, damage prevention and mechanical strength improvement
Pending Publication Date: 2022-03-15
SHANGHAI ELECTRICAL GUOXUAN NEW ENERGY TECH CO LTD
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to overcome the low mechanical strength of non-metallic current collectors in the prior art, which is difficult to be suitable for lithium-ion batteries, and provide an aggregate material, non-metallic current collectors and their preparation methods, application
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Embodiment 1
[0111] A lithium battery current collector, which includes a polymer aggregate and a modified carbon fiber layer on the surface;
[0112] The polymer fiber aggregate is composed of natural wood pulp fibers (5-20 μm in length), conductive agent (carbon nanotubes), and dispersant polyacrylamide, and the mass ratio of the three is 80:18:2;
[0113] The modified carbon fiber layer is composed of polypropylene fiber (1-5 μm in length), activated carbon fiber (3-20 μm in diameter, 5-20 μm in length), heteroatom precursor and polyacrylamide (binder), with a mass ratio of 10 :88:2:2; The heteroatom precursor is selected from aniline.
[0114] A kind of current collector of lithium battery, its preparation method comprises the following steps:
[0115] 1) Referring to Table 1, the wood pulp fiber (component A in the polymer aggregate) is air-dried and broken into individual fibers by a crusher, and then transported to the wood pulp former, and the conductive agent (component A in the ...
Embodiment 2-8、 comparative example 1-2
[0121] Concrete components and process are shown in Table 1 and Table 2 below, and all the other steps are the same as in Example 1.
[0122] Table 1
[0123]
[0124]
[0125] Note: The dimensions of natural wood pulp fibers, polypropylene fibers, activated carbon fibers and conductive carbon fibers in Table 1 refer to the length.
[0126] Table 2
[0127]
[0128]
[0129] Note: The dimensions of natural wood pulp fibers, polypropylene fibers, activated carbon fibers and conductive carbon fibers in Table 2 refer to the length; " / " means that this component is not added.
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Abstract
The invention discloses an aggregate material, a non-metal current collector and a preparation method and application of the non-metal current collector. The raw material composition of the aggregate material comprises the following components: wood pulp fibers, a conductive agent and a dispersing agent, wherein the mass ratio of the wood pulp fibers to the conductive agent is 1: (0.2-0.5); the mass ratio of the wood pulp fibers to the dispersing agent is 1: (0.01-0.1); the length of the wood pulp fibers is 5-20 microns. The nonmetal current collector comprises the aggregate material and a modified carbon fiber layer attached to the surface of the aggregate material. The aggregate material disclosed by the invention is high in mechanical strength, good in conductivity and strong in adhesion; the non-metal current collector has the characteristics of good conductivity, high mechanical strength and the like, can effectively reduce the weight ratio of the current collector in the lithium ion battery, and can be widely used in the field of lithium ion batteries.
Description
technical field [0001] The invention relates to an aggregate material, a non-metallic current collector, a preparation method and an application thereof. Background technique [0002] Traditional lithium-ion batteries generally use metal materials such as aluminum foil, copper foil / iron foil, etc. as current collectors for the positive and negative electrodes. However, there are many shortcomings in the use of metal current collectors, such as the low reduction potential of metal materials, and the oxidation reaction is prone to occur during battery charging and discharging to produce metal ions that contaminate the lithium-ion battery, resulting in a decline in the performance of the lithium-ion battery; Subsequent cutting (mold cutting, laser cutting, disc knife cutting, etc.) is prone to burrs and poses hidden dangers to safety; the density of metal materials is high, which occupies more of the overall weight of the battery, affecting the further improvement of battery qu...
Claims
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