Composite Positive Electrode Sheet with High Compacted Density, Method for Preparing the Same, and Energy Storage Device
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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 positive electrode sheets do not achieve optimal compacted density and electrolyte infiltration.
Innovation Solution
A composite positive electrode sheet with inserts of larger particle size than the coating layer, inserted into the coating layer to form a compacted structure with a density of at least 2.3 g/cm3, enhancing electrolyte infiltration and electrochemical performance by controlling the width, distance, and depth of the inserts within specific ranges.
Engineering Contradictions & Design Principles
Engineering 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
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
2Reliability
If lithium iron phosphate is used as positive electrode material, then safety property is improved, but energy density is low
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
3Ease of manufacture
If conventional coating method is used to prepare positive electrode sheet, then manufacturing process is simple, but compacted density is insufficient
Solution Approach 1:
The patent introduces inserts with larger particle sizes at specific locations within the coating layer, creating local density enhancements that improve overall compacted density while maintaining the simplicity of the conventional coating process
Solution Approach 2:
The patent changes the particle size parameter by introducing inserts with larger particle sizes into the coating layer, achieving higher compacted density of at least 2.3 g/cm3 without fundamentally altering the manufacturing process
4Ease of manufacture
If conventional coating method is used to prepare positive electrode sheet, then manufacturing process is simple, but electrolyte infiltration is insufficient
Solution Approach 1:
The inserts with larger particle sizes create localized regions within the coating layer that facilitate electrolyte infiltration, improving overall electrolyte access while maintaining process simplicity
Solution Approach 2:
The inserts create a porous-like structure within the coating layer that enhances electrolyte infiltration pathways, improving electrochemical performance without complicating the manufacturing process
Data Source
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.