Composite Positive Electrode Sheet for High Compacted Density

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Solution Overview

Problem

Current lithium battery positive electrode materials, such as lithium iron phosphate, have low theoretical capacity and energy density, limiting the development of high-energy-density lithium batteries, and existing methods for preparing lithium iron manganese phosphate electrodes do not achieve sufficient compacted density for optimal performance.

Innovation Solution

A composite positive electrode sheet is designed with inserts of larger particle size than the coating layer, inserted into the coating layer on a current collector, and subjected to a pressing process to achieve a compacted density of at least 2.3 g/cm³, facilitating better electrolyte infiltration and electrochemical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If lithium iron phosphate is used as positive electrode material, then safety property is improved, but theoretical gram capacity and energy density are low

Engineering Contradiction:

Improvesafety propertyVSAvoidtheoretical gram capacity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent uses lithium iron manganese phosphate as a composite positive electrode material that combines the safety benefits of lithium iron phosphate with higher energy density characteristics, achieving both safety and improved capacity

Inventive Principle:

Principle #40Composite materials

2Reliability

If lithium iron phosphate is used as positive electrode material, then safety property is improved, but energy density is low

Engineering Contradiction:

Improvesafety propertyVSAvoidenergy density

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent employs lithium iron manganese phosphate composite material that maintains the safety properties of lithium iron phosphate while achieving 20% higher energy density through its 4.1V voltage platform

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If conventional coating method is used to prepare positive electrode sheet, then manufacturing process is simple, but compacted density is insufficient

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidcompacted density

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent segments the electrode structure into coating layer and insert layers with different particle sizes, allowing each layer to be optimized independently for both manufacturability and high compacted density

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by using larger particle size material specifically in the insert layers while maintaining smaller particles in the coating layer, creating localized density enhancement without compromising overall manufacturability

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP4475215A1Composite positive electrode sheet with high compacted density, method for preparing the same, and energy storage device

Publication Date: 2024.12.11 HITHIUM TECH HK LTD

Figure 1(a)~1(d)
Figure 2(a)~4

AI summary

The present application relates to a composite positive electrode sheet with a high compacted density, and a method for preparing the same, and an energy storage device. The composite positive electrode sheet of the present application comprises a current collector, a coating layer and a plurality of inserts.