Positive Electrode Material Formation Using Fluoride Sublimation
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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 fluoride is volatilized or sublimated at specific temperatures, and an oxygen-rich atmosphere is maintained to form a positive electrode active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to form lithium composite oxide LiMO2, then the material can be produced, but the production cost is high and the process time is long
Solution Approach 1:
The patent changes the chemical composition parameters by introducing fluoride (LiF) and magnesium compound (MgF2) into the reaction system, which modifies the reaction kinetics and enables faster formation of LiMO2 at lower temperatures, thereby reducing both production time and energy costs
Solution Approach 2:
The fluoride and magnesium compound act as intermediary substances that facilitate the reaction between lithium oxide and other precursors. These intermediaries lower the activation energy required for LiMO2 formation, enabling the process to proceed more efficiently under milder conditions
2Reliability
If the battery capacity and cycle performance are improved, then the reliability increases, but the manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-mixing the fluoride and magnesium compound with the lithium oxide precursor before the main reaction. This pre-preparation ensures uniform distribution of reactive components, leading to consistent product quality and reliable cycle performance without requiring complex post-processing steps
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 formation of LiMO2 efficiently and effectively, improving battery performance and safety.
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
the heating furnace is heated at a temperature higher than or equal to 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.