Electrode, method for manufacturing an electrode, and battery

A multilayer electrode structure with varying particle sizes addresses the low porosity issue in lithium-ion batteries, enhancing lithium ion diffusion and maintaining high compaction density for improved energy density and kinetic performance.

JP7864142B2Active Publication Date: 2026-05-22BYD CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
BYD CO LTD
Filing Date
2022-08-05
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

The challenge in improving the volumetric energy density of lithium-ion batteries is hindered by the low porosity of electrodes at high compaction densities, which impedes lithium ion diffusion and degrades kinetic properties.

Method used

A multilayer electrode structure is designed with varying particle sizes, where the first layer near the separator has larger particles and subsequent layers incorporate smaller particles, creating a gradient increase in porosity, enhancing lithium ion diffusion and maintaining high compaction density.

Benefits of technology

The multilayer electrode structure achieves higher volumetric energy density and improved kinetic characteristics by optimizing lithium ion diffusion and maintaining high compaction density.

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Abstract

The present invention discloses an electrode, a method for manufacturing the electrode, and a battery, the electrode including n electrode plate layers stacked in order, the electrode plate layer adjacent to a separator of the battery being a first layer, the electrode plate layer adjacent to a current collector of the battery being an nth layer, n being a natural number of 2 or more, the electrode material of the first electrode plate layer including first particles, the electrode material of each of the electrode plate layers from the second layer to the nth layer including at least first particles and second particles, the average particle size of the first particles being larger than the average particle size of the second particles, and the porosity of each of the electrode plate layers gradually increasing in the direction from the nth layer to the first layer.
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