LFMP Positive Electrode Composition for Battery Output and Thermal Stability
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Solution Overview
Problem
Lithium cobalt composite oxides (LiCoO2) used in lithium secondary batteries have poor thermal properties and high costs, while lithium manganese-based oxides exhibit reduced stability and output characteristics, limiting their use in applications like electric vehicles.
Innovation Solution
A positive electrode for lithium secondary batteries is designed with a carbon layer on a current collector and a LiFe1-x-yMnxMyPO4-based positive electrode active material layer, where M is Mg, Al, or Ni, and the carbon content ratio is controlled to enhance conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium cobalt composite oxide (LiCoO2) is used as positive electrode active material, then high working voltage and excellent capacity characteristics are achieved, but thermal properties deteriorate and cost increases
Solution Approach 1:
The patent uses lithium iron phosphate (LiFePO4) as a composite material alternative to lithium cobalt oxide, combining the advantages of high voltage with improved thermal stability and cost-effectiveness through material composition optimization
2Reliability
If lithium manganese-based oxides are used as positive electrode active material, then cost is reduced and thermal stability is improved, but structural stability and output characteristics deteriorate
Solution Approach 1:
The patent optimizes the crystal structure parameters of lithium manganese-based oxides by controlling Fe2+ content (0.01 ≤ x ≤ 0.05) and sintering conditions to maintain structural stability while preserving thermal stability advantages, resolving the contradiction between structural integrity and thermal performance
3Ease of manufacture
If lithium manganese-based oxides are used as positive electrode active material, then cost is reduced, but output characteristics deteriorate
Solution Approach 1:
The patent enhances output characteristics by optimizing electrochemical parameters including Fe2+ content control (0.01 ≤ x ≤ 0.05), sintering temperature (900-1100°C), and carbon coating thickness, achieving improved output performance while maintaining cost advantages of lithium manganese-based materials
Data Source
AI summary
The present invention relates to an LFMP-based positive electrode active material for a lithium secondary battery, provided with excellent capacity and lifetime characteristics, and a secondary battery including the same, and specifically, relates to an LFMP-based positive electrode active material for a lithium secondary battery, provided with excellent capacity and long life characteristics due to the composition of the LFMP-based positive electrode active material and structural characteristics of a positive electrode including the same, and a lithium secondary battery including the same.