Lithium Iron Manganese Phosphate Cathode With Fe2P Carbon Network
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Solution Overview
Problem
Conventional positive electrode active materials for lithium secondary batteries face issues such as low energy density, poor electronic conductivity, and environmental pollution due to the generation of harmful substances like SOx and NOx during the manufacturing process, which also leads to energy consumption and yield losses.
Innovation Solution
A manufacturing method for a lithium composite compound comprising Fe and Mn, with a specific distribution of Fe2P phase and amorphous carbon coating, is used to produce a positive electrode active material without a separate precursor synthesis, eliminating harmful substance generation and improving conductivity and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium manganese iron phosphate is used to increase operating voltage and energy density, then energy density is improved, but electronic conductivity deteriorates
Solution Approach 1:
The patent uses a composite material structure where lithium manganese iron phosphate particles are coated with amorphous carbon and contain Fe2P phase distributed in the matrix. This composite structure combines the high voltage characteristics of lithium manganese iron phosphate with the excellent conductivity of carbon and Fe2P phase, resolving the contradiction between energy density and electronic conductivity.
Solution Approach 2:
The patent applies local quality by creating different regions within the positive electrode active material: the core contains lithium manganese iron phosphate for high voltage, the interior regions contain Fe2P phase for conductivity enhancement, and the surface is coated with amorphous carbon for protection and conductivity. This spatial distribution of different properties resolves the contradiction between bulk energy density and local conductivity.
2Ease of manufacture
If conventional precursor synthesis method is used, then positive electrode active material can be manufactured, but harmful substances (SOx and NOx) are generated causing environmental pollution
Solution Approach 1:
The patent extracts and eliminates the harmful precursor synthesis step from the manufacturing process. By directly synthesizing lithium manganese iron phosphate from raw materials without forming intermediate precursors, the process removes the source of SOx and NOx generation while maintaining manufacturability.
Solution Approach 2:
The patent converts the harmful high-temperature calcination process that generates pollutants into a beneficial direct synthesis process. By optimizing the direct synthesis conditions, the patent achieves complete reaction without harmful byproducts, turning a previously harmful process into an environmentally friendly one.
3Ease of manufacture
If lithium is added after precursor synthesis and dehydration/drying is performed, then positive electrode active material can be produced, but energy consumption increases and yield decreases
Solution Approach 1:
The patent applies preliminary action by incorporating lithium into the synthesis process from the beginning rather than adding it later. By mixing lithium-containing raw materials with other precursors before the main synthesis reaction, the patent eliminates subsequent dehydration and drying steps, reducing energy consumption and improving yield.
Solution Approach 2:
The patent merges the lithium addition step with the main synthesis step into a single integrated process. By combining multiple operations (mixing, reaction, and formation) into one continuous process, the patent eliminates intermediate dehydration and drying steps, thereby reducing energy consumption and improving overall yield.
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
The method results in an environmentally friendly production process that enhances electronic conductivity and energy density while maintaining battery stability and capacity, reducing the formation of resistive impurity phases.
Implementation Method 1
an Fe2P phase is present in at least a partial region of the particulate materials
Implementation Method 2
lithium ions are intercalated/deintercalated into/from the positive electrode and the negative electrode
Implementation Method 3
at least a portion of the particulate materials may have an amorphous carbon coating layer with a thickness of 1 to 500 nm formed on at least a part of the surface
Data Source
AI summary
The present disclosure relates to a positive electrode active material for a lithium secondary battery, and more particularly, to a positive electrode active material for a lithium secondary battery having excellent electrical conductivity and energy density, and to a positive electrode and a secondary battery comprising the same.