Li2MnO3 Composite Cathode for High Energy Density EV Batteries
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Solution Overview
Problem
Conventional cathode materials for lithium secondary batteries, such as LMO, NMC, and olivine-based LiFePO4, have limitations in terms of safety, energy density, and durability, particularly for medium and large-sized batteries used in electric vehicles, with insufficient energy density and limited charging distance.
Innovation Solution
A Li2MnO3-based composite material Li(LixNiyCozMnwO2 is synthesized through co-precipitation using a starting material mixture of nickel, manganese, and cobalt nitrates with a complex agent, followed by sintering, and then mixed with LiMn1/3Co1/3Ni1/3O2 (NMC) to enhance capacity and energy density, and used in the manufacturing of electrodes with a specific composition and structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cathode materials (LMO, NMC, olivine LiFePO4) are used, then safety is improved, but energy density deteriorates
Solution Approach 1:
The patent uses Li2MnO3 as a composite cathode material that combines the safety advantages of manganese-based materials with high capacity characteristics. The material achieves both safety and high energy density by utilizing the specific crystal structure and electrochemical properties of Li2MnO3, which provides stable framework structure for safety while enabling high lithium ion insertion/extraction for high energy density.
2Ease of manufacture
If conventional cathode materials are used, then manufacturing cost is reduced, but energy density deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by using Li2MnO3 with specific stoichiometry and crystal structure modifications to achieve high energy density. By optimizing the lithium content and manganese oxidation states, the material achieves superior performance while maintaining cost-effectiveness through earth-abundant elements.
3Quantity of substance
If conventional cathode materials are used, then battery capacity is limited, but charging distance deteriorates
Solution Approach 1:
The patent achieves high battery capacity (175 mAh/g at 15 cycles) by optimizing the Li2MnO3 composition and structure, which directly translates to extended charging distance for electric vehicles. The high capacity is achieved through efficient lithium ion transport and high operating voltage.
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 Li2MnO3-based composite material achieves a high capacity of 175 mAh/g at 15 cycles and maintains a high energy density, improving the charging efficiency, durability, and safety of lithium secondary batteries, thereby enhancing the driving distance of electric vehicles and reducing costs.
Implementation Method 1
A Li2MnO3-based composite material Li(LixNiyCozMnwO2 is synthesized through co-precipitation using a starting material mixture of nickel, manganese, and cobalt nitrates with a complex agent
Implementation Method 2
followed by sintering, and then mixed with LiMn1/3Co1/3Ni1/3O2 (NMC) to enhance capacity and energy density
Data Source
AI summary
The present invention relates to the manufacture of a high capacity electrode by synthesizing an excellent Li2MnO3-based composite material Li(LixNiyCozMnwO2) to improve the characteristics of an inactive Li2MnO3 material with a specific capacity of about 460 mAh/g. Here, a manufacturing method of a cathode material for a lithium secondary battery uses a Li2MnO3-based composite material Li(LixNiyCozMnwO2) by reacting a starting material wherein a nickel nitrate solution, a manganese nitrate solution and a cobalt nitrate solution are mixed, with a complex agent by co-precipitation.