Positive Electrode Composition for Mn Dissolution Control
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Solution Overview
Problem
Manganese (Mn) dissolution during high temperature storage in electrochemical apparatuses, such as lithium-ion batteries, leads to capacity fading and increased costs due to the Jahn-Teller effect and HF corrosion, compromising the safety and performance of manganese-containing materials.
Innovation Solution
Control the mass ratio of manganese-containing materials, such as lithium manganate, in the positive electrode active material layer within a specific range (0.4 to 1) and adjust the surface density of the positive electrode active material layer (18-52 g/cm²) to minimize Mn dissolution, using conductive agents and binders like carbon black and polyvinylidene fluoride, and optimize the electrolyte composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manganese-containing materials are used in the positive electrode active material layer, then cost is reduced and safety performance is improved, but Mn dissolution occurs during high temperature storage causing capacity fading
Solution Approach 1:
The patent applies parameter changes by optimizing the mass ratio of manganese-containing material to positive electrode active material within a specific range (0.4 to 1), and controlling the surface density of the positive electrode active material layer between 18-52 g/cm². These parameter optimizations reduce Mn dissolution while maintaining cost-effectiveness and safety performance.
Solution Approach 2:
The patent uses composite materials by combining manganese-containing materials (such as lithium manganate) with other positive electrode active materials to form a composite positive electrode active material layer. This composite structure reduces Mn dissolution through synergistic effects while maintaining the cost and safety advantages of manganese-containing materials.
2Reliability
If the mass ratio of manganese-containing material is increased to improve safety and reduce cost, then Mn dissolution increases causing capacity fading
Solution Approach 1:
The patent applies parameter changes by precisely controlling the mass ratio of manganese-containing material to positive electrode active material within the range of 0.4 to 1. This optimized ratio maintains sufficient safety performance while limiting Mn dissolution by preventing excessive manganese content that would加剧 dissolution.
3Quantity of substance
If the surface density of the positive electrode active material layer is increased to improve energy density, then Mn dissolution is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by establishing a specific range for the surface density of the positive electrode active material layer (18-52 g/cm²). This optimized range achieves high energy density while remaining manufacturable, balancing performance requirements with manufacturing precision capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces Mn dissolution, maintaining storage capacity and improving safety and cost-effectiveness of electrochemical apparatuses by controlling the mass ratio and surface density of manganese-containing materials, thereby enhancing the performance and competitiveness of lithium-ion batteries.
Implementation Method 1
during high temperature storage, due to the Jahn-Teller (Jahn-Teller) effect and HF corrosion in the electrolyte, Mn is dissolved out
Implementation Method 2
during high temperature storage, due to the Jahn-Teller (Jahn-Teller) effect and HF corrosion in the electrolyte, Mn is dissolved out
Data Source
AI summary
An electrochemical apparatus includes a positive electrode plate, the positive electrode plate includes a positive electrode active material layer, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material includes a manganese-containing material, and a mass ratio Y of the manganese-containing material to the positive electrode active material ranges from 0.4 to 1. Through control of the mass ratio Y of the manganese-containing material to the positive electrode active material in the positive electrode active material layer, Mn dissolution out of the positive electrode active material layer can be effectively controlled.