Positive Electrode Material Formation in a Fluoride Furnace Atmosphere
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Solution Overview
Problem
Lithium ion secondary batteries require improvements in capacity, cycle performance, charge and discharge characteristics, reliability, and safety, with a need for a low-cost and efficient method to form lithium composite oxides like LiMO2.
Innovation Solution
A method involving a heating process in a furnace with a mixture of lithium oxide, fluoride, and a magnesium compound, where the furnace is heated at specific temperatures and in an atmosphere containing fluoride to form a positive electrode active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods are used to form lithium composite oxide, then the process is well-established, but the cost is high and the formation time is long
Solution Approach 1:
The invention changes the chemical composition parameters by introducing fluoride and magnesium compound to lithium oxide, forming a specific compositional range (Li1-x-yMxO2 where 0.01≤x≤0.1 and 0.01≤y≤0.05) that enables faster formation and lower cost while maintaining performance
Solution Approach 2:
The invention creates a composite material system combining lithium oxide, fluoride, and magnesium compound, where the synergistic interaction between components enables improved manufacturing efficiency and reduced costs compared to conventional single-material approaches
2Reliability
If lithium composite oxide is formed to improve capacity and cycle performance, then battery performance increases, but the manufacturing complexity increases
Solution Approach 1:
The invention performs preliminary action by pre-mixing lithium oxide, fluoride, and magnesium compound in specific ratios before heating, which simplifies the manufacturing process while ensuring the formation of the desired composite structure and improved cycle performance
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
This method produces a novel positive electrode active material with enhanced characteristics, enabling the development of improved power storage devices.
Implementation Method 1
the heating furnace is heated at a temperature higher than or equal to a temperature at which the fluoride is volatilized or sublimated
Implementation Method 2
a temperature at which the fluoride is volatilized or sublimated
Implementation Method 3
a temperature at which the fluoride is volatilized or sublimated
Data Source
AI summary
A method for forming a positive electrode active material of a lithium ion secondary battery is provided. In the method for forming a positive electrode active material, a first container that includes a mixture of lithium oxide, fluoride, and a magnesium compound and fluoride that is outside the first container are provided in a heating furnace, and the heating furnace is heated at a temperature higher than or equal to a temperature at which the fluoride is volatilized or sublimated. It is further preferable that the fluoride be lithium fluoride and the magnesium compound be magnesium fluoride.