Patterned Coating Layer for Low-Resistance Lithium Battery Anodes

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Solution Overview

Problem

Rechargeable lithium batteries face challenges in achieving excellent cycle-life characteristics and low resistance, which are crucial for high-capacity and lightweight batteries used in electronic devices and electric vehicles.

Innovation Solution

A negative electrode for rechargeable lithium batteries is designed with a current collector, a negative active material layer, and a coating layer containing an organic metal-based material in a pattern shape, which enhances adhesion and maintains electrical conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a coating layer is applied between the current collector and negative active material layer, then adhesion is improved, but resistance increases

Engineering Contradiction:
ImproveadhesionVSAvoidresistance
Core Design Contradiction:
StrengthVSReliability

Solution Approach 1:

The coating layer is applied in a pattern shape rather than uniformly across the entire current collector surface. This creates regions with different properties: patterned areas provide enhanced adhesion while non-patterned areas maintain low resistance for electron transport, thus resolving the contradiction between adhesion strength and electrical conductivity

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The coating layer is divided into discrete patterned regions rather than forming a continuous film. This segmentation allows different functional zones to coexist on the same current collector surface, enabling simultaneous optimization of adhesion in patterned areas and electrical conductivity in non-patterned areas

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS20250087692A1Negative electrode for rechargeable lithium battery and rechargeable lithium battery including same
Publication Date: 2025.03.13 SAMSUNG SDI CO LTD
  • US20250087692A1 patent drawing
  • US20250087692A1 patent drawing
  • US20250087692A1 patent drawing

AI summary

A negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same are provided. The negative electrode includes a current collector, a negative active material layer including a negative active material, and a coating layer between the current collector and the negative active material layer, the coating layer including an organic metal-based material, and having a pattern shape.