Positive electrode plate of lithium ion battery and preparation method for positive electrode plate

Abstract

The invention discloses a positive electrode plate of a lithium ion battery and a preparation method for the positive electrode plate. The positive electrode plate comprises a positive electrode active material, a conductive agent, a binder and a current collector; the positive electrode active material is selected from one or more of lithium iron phosphate, lithium nickel cobalt manganate, lithium nickel manganate, lithium cobalt oxide or lithium manganate; the conductive agent is nanometer carbon fibers; the binder is polyvinylidene fluoride; and the current collector is carbon fiber composite non-woven fabrics. By virtue of the small additive amount of the binder, high conductivity of the electrode plate and the liquid-absorbing and liquid-holding capability of the carbon fiber composite non-woven fabrics, the lithium ion battery prepared from the positive electrode plate is high in charging-discharging performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium ion battery positive plate and a preparation method thereof. Background technique [0002] Lithium-ion batteries have high energy density, environmental protection, good safety performance and rate performance, and long cycle life, and have attracted widespread attention from humans. Lithium-ion batteries mainly include positive electrodes, negative electrodes, diaphragms, electrolytes and casings. As an important part of lithium-ion batteries, positive electrodes directly affect the overall performance of lithium-ion batteries. At present, the existing positive electrode sheets of lithium-ion batteries include positive active materials, conductive agents, aluminum current collectors, binders, etc. The positive active materials are generally lithium intercalation compounds. In order to improve the conductivity of the positive electrode, an appropriate amount...

AI Technical Summary

Problems solved by technology

The aluminum current collector and the binder occupy a certain weight ratio in the entire battery. The aluminum current collector does not have the ability to absorb and hold liquid, and the positive electrode active material and the conductive agent need a sufficient amount of binder to adhere to the aluminum current collector. The binder is an insulating substance, the addition of the binder will greatly reduce the conductivity of the battery and affect the overall performance of the material

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