A kind of preparation method of high-power type lithium-ion battery conductive agent and lithium-ion battery

Abstract

A preparation method of a high-power lithium-ion battery conductive agent and the lithium-ion battery relate to the technical field of lithium-ion batteries. The specific scheme is as follows: add the polymer monomer into the aqueous solution containing the templating agent, disperse evenly, let stand at -30-50°C for 0.5-24h, add a polymer initiator to initiate the polymerization of the polymer monomer, and obtain a solid content of 5-55wt% conductive agent polymer suspension; after the conductive agent polymer suspension is centrifuged, the lower sediment is washed several times with absolute ethanol until the upper layer is colorless and clear, after removing the supernatant, the The lower precipitate was placed in a vacuum drying oven at 60-90°C for 12-48 hours in a vacuum environment and ground to obtain a solid powder S; the solid powder S was placed in N 2 Or high-temperature carbonization in an Ar gas environment to obtain a high-power lithium-ion battery conductive agent. The positive and negative electrodes prepared by using the conductive agent prepared by the invention have high electronic conductivity and ion conductivity, and can significantly improve the high-rate charge and discharge capability of the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a high-power lithium ion battery conductive agent and a lithium ion battery containing the conductive agent. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, flexible size, and unlimited application fields, so they have received keen attention and vigorous pursuit from various industries. The rapid development of lithium-ion battery technology has greatly promoted industries such as mobile phones, laptops and other portable electronic devices, as well as new energy vehicles. Higher and more advanced technical product requirements. Today, when the volume energy density and weight energy density have reached the bottleneck, various industries have begun to put forward more and more stringent technical requirements for batteries in terms of fast charging, instantaneous power, and low-temperat...

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Problems solved by technology

A good conductive agent should have a relatively high specific surface area, a moderate particle size, and a high oil absorption value. However, because the current conductive agent is an inorganic conductive agent, it has poor affinity for the electrolyte, which makes the ionic conductivity of the diaphragm Very low, resulting in a large ion diffusion resistance, hindering the improvement of the power performance of the battery cell, manifested as weak fast charging performance, low instantaneous power and poor low temperature cold start performance

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