Method for preparing high-power lithium-ion battery conductive agent and lithium-ion battery

Abstract

The invention discloses a method for preparing a high-power lithium-ion battery conductive agent and a lithium-ion battery, relating to the technical field of lithium-ion batteries. The specific scheme is as follows: a polymer monomer is added into an aqueous solution containing a templating agent, uniformly dispersed, and allowed to stand at 30 to 50 DEG C for 0.5 to 24 hours, and a polymer initiator is added to initiate the polymerization of a polymer monomer to obtain a conductive agent polymer suspension with the solid content of 5 to 55 wt%; after the centrifugal separation of the conductive agent polymer suspension, a lower layer sediment is washed with absolute ethanol for several times until a supernatant is colorless and clear, after removing the supernatant, the lower layer sediment is placed in a 60 to 90 DEG C vacuum environment in a vacuum drying oven for 12 to 48 hours and is ground to obtain solid powder S; the solid powder S is placed in a N2 or Ar gas atmosphere environment for high-temperature carbonization to obtain the high-power lithium-ion battery conductive agent. Positive and negative electrodes made by using the conductive agent prepared by the invention have high electron conductivity and ionic conductivity, and the large-rate charge and discharge ability of the lithium-ion battery can be significantly improved.

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...

AI Technical Summary

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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