Physiochemical pretreatment for battery current collector

Abstract

The disclosure relates to physiochemical pretreatment for battery current collector. A battery electrode having improved adhesion is disclosed. The electrode may include a copper current collector, a layer of copper hydroxide contacting the copper current collector, a buffer layer contacting the layer of copper hydroxide, the buffer layer including a flexible material and a conductive material, and an electrode active material layer contacting the buffer layer. The electrode active material may be an anode active material including a carbon-silicon composite. The electrode may be formed by chemically treating the current collector to have an increased surface area and then applying a buffer layer to the chemically treated current collector surface and an electrode active material to the buffer layer. The battery electrode may be included in a secondary battery, such as a lithium-ion battery, and may improve electrode active material adhesion and battery capacity.

Description

technical field [0001] The present disclosure relates to physicochemical pretreatment of battery current collectors, such as lithium-ion batteries. Background technique [0002] During charge and discharge cycles, certain secondary battery electrodes undergo volume changes. For example, high-energy electrode materials like silicon (Si) may undergo large volume changes during lithiation and delithiation in lithium-ion (Li-ion) batteries. Lateral expansion and contraction of the electrode material can lead to delamination from standard current collectors such as bare copper or aluminum, which can degrade performance and repeatability. Additionally, high energy electrodes may contain lower amounts of binder, which can hinder initial adhesion to the bare current collector foil, possibly exacerbating the problem. Contents of the invention [0003] In at least one embodiment, a battery electrode is provided. The battery electrode may include: a copper current collector; a cop...

AI Technical Summary

Problems solved by technology

Lateral expansion and contraction of the electrode material can lead to delamination from standard current collectors such as bare copper or aluminum, which can degrade performance and repeatability

Additionally, high-energy electrodes may contain lower amounts of binder, which can hinder initial adhesion to the bare current collector foil, potentially exacerbating the problem

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