Lithium Nickel Manganese Composite Oxide Cathode Material
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Solution Overview
Problem
Current lithium secondary battery cathode materials face challenges such as high costs, environmental toxicity, poor thermal stability, and limited charge capacity due to the use of cobalt and nickel-based oxides, and manganese-based materials suffer from dissolution issues and low energy density.
Innovation Solution
Development of a lithium-nickel-manganese composite oxide with a layered crystal structure, specifically Li—Na—Ni—Mn composite oxides, and a method involving the precipitation and calcination of transition metal carbonates to produce nano-sized particles with controlled particle size and morphology, enhancing intercalation/deintercalation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LiCoO2 is used as positive electrode material, then stable charge-discharge characteristics and favorable discharge voltage characteristics are achieved, but high cost and environmental toxicity occur due to cobalt
Solution Approach 1:
The patent replaces expensive cobalt-based materials with cheaper manganese-based materials (LiMn2O4, Li1-xMn2-xMxO4 where M is Ni, Co, Al, or Ti). This substitution significantly reduces material cost while maintaining acceptable electrochemical performance through careful compositional design and surface modification
Solution Approach 2:
The patent employs composite cathode materials combining multiple elements (Li-Mn-Ni-Co-Al-Ti oxides) to achieve synergistic effects. The composite structure integrates the stability benefits of cobalt/nickel with the cost advantages of manganese, while additional elements like aluminum and titanium provide surface protection and structural stability
2Object-affected harmful factors
If LiNiO2 is used as alternative material to LiCoO2, then cost is reduced, but poor thermal stability and difficulty in synthesis occur
Solution Approach 1:
The patent applies surface modification where the bulk material composition is optimized for cost (manganese-rich) while the surface is modified with protective coatings or surface treatments that enhance thermal stability. This local differentiation allows the bulk to provide cost benefits while the surface provides thermal protection
Solution Approach 2:
The patent creates composite structures where LiNiO2 or LiMn2O4 is combined with other metal oxides (Al2O3, TiO2, or other stabilizing phases) to form a composite cathode material that exhibits improved thermal stability compared to the individual components
3Ease of manufacture
If LiMn2O4 spinel is used as positive electrode material, then low cost and ease of synthesis are achieved, but Mn ion dissolution occurs leading to graphite anode poisoning and limited charge capacity
Solution Approach 1:
The patent modifies the surface properties of LiMn2O4 particles through coating with protective layers (such as Al2O3, TiO2, or other stable oxides) or surface treatment processes. This surface modification prevents Mn dissolution into the electrolyte while maintaining the bulk material's ease of synthesis and low cost characteristics
Solution Approach 2:
The patent creates composite cathode materials where LiMn2O4 is combined with stabilizing phases or surface-modified layers that prevent manganese dissolution. The composite structure maintains the low-cost advantage of LiMn2O4 while adding protective functionality to prevent anode poisoning
4Ease of manufacture
If solid-state reaction process is used for preparing cathode materials, then simple process is achieved, but irregular phases and difficult particle size control occur with high production temperature and long time required
Solution Approach 1:
The patent employs pre-formed precursor materials (such as pre-synthesized metal oxides, hydroxides, or carbonate mixtures) with controlled particle size and composition before the final calcination step. This preliminary preparation ensures uniform phase formation and consistent particle size in the final product, reducing the need for extended high-temperature processing
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 solution provides cathode materials with improved charge capacity, thermal stability, and reduced production costs, while maintaining the advantages of Co and Ni oxides, and addressing the limitations of Mn-based materials, resulting in high-rate capability and long cycle life for lithium secondary batteries.
Implementation Method 1
graphite is used as a negative electrode material that is capable of intercalating/deintercalating lithium ions
Implementation Method 2
a method involving the precipitation and calcination of transition metal carbonates to produce nano-sized particles
Implementation Method 3
precipitation and calcination of transition metal carbonates to produce nano-sized particles
Data Source
AI summary
A method for producing a lithium alkali transition metal oxide for use as a positive electrode material for lithium secondary batteries by a precipitation method. The positive electrode material is a lithium alkali transition metal composite oxide and is prepared by mixing a solid state mixed with alkali and transition metal carbonate and a lithium source. The mixture is thermally treated to obtain a small amount of alkali metal residual in the lithium transition metal composite oxide cathode material.