Positive Electrode Material Formation Using Oxygen-Assisted Fluoride Heating
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Solution Overview
Problem
Lithium-ion secondary batteries require improvements in capacity, cycle performance, charge and discharge characteristics, reliability, and safety, particularly in the development of lithium composite oxide LiMO2 with substituted elements, and a cost-effective and time-efficient method for forming this material is needed.
Innovation Solution
A method involving the use of a heating furnace with controlled atmospheres, including oxygen or evacuation followed by oxygen introduction, to form a positive electrode active material by heating a mixture of lithium oxide, fluoride, and magnesium compound at specific temperatures to create LiMO2, utilizing LiF and MgF2 as preferred sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to form positive electrode active material, then the material can be produced, but the formation time is long and cost is high
Solution Approach 1:
The patent changes the chemical composition parameters by introducing fluoride ions and controlling the ratio of lithium oxide to magnesium compound, which enables the formation process to proceed more rapidly. By adjusting these compositional parameters, the formation time is significantly reduced while maintaining material quality
Solution Approach 2:
The patent uses a composite mixture of lithium oxide, magnesium compound, and fluoride as starting materials. This composite approach allows for simultaneous multiple functions: lithium oxide provides lithium source, magnesium compound provides structural framework, and fluoride accelerates the reaction, collectively reducing formation time
2Ease of manufacture
If conventional methods are used to form positive electrode active material, then the material can be produced, but the production cost is high
Solution Approach 1:
The patent employs inexpensive starting materials including lithium oxide, magnesium compound, and fluoride that can be readily obtained. These materials are used in optimized quantities to reduce overall production cost while achieving the desired product quality
Solution Approach 2:
By optimizing the compositional ratios of starting materials and controlling processing parameters, the patent reduces material waste and improves yield, thereby lowering the effective production cost per unit of product
3Reliability
If lithium composite oxide LiMO2 with substituted elements is developed, then capacity and cycle performance improve, but the manufacturing complexity increases
Solution Approach 1:
The patent introduces substituted elements at specific positions within the lithium composite oxide structure, creating local variations in composition that enhance cycle performance. This localized substitution approach allows for performance improvement without requiring complete restructuring of the entire material system
Solution Approach 2:
The patent creates a composite structure by combining lithium oxide, magnesium compound, and fluoride in specific ratios. This composite approach enables the material to exhibit enhanced cycle performance while maintaining a relatively simple manufacturing process through controlled chemical reactions
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 enables the formation of a novel positive electrode active material with enhanced characteristics, allowing for efficient production of a power storage device with improved performance and reduced formation time.
Implementation Method 1
a third step of heating the inside of the heating furnace
Implementation Method 2
providing an atmosphere including oxygen in an inside of the heating furnace
Data Source
AI summary
A method for forming a positive electrode active material of a lithium ion secondary battery is provided. The method for forming a positive electrode active material includes a first step of placing a first container in which a mixture of a lithium oxide, a fluoride, and a magnesium compound are put, in a heating furnace, a second step of providing an atmosphere including oxygen in an inside of the heating furnace, and a third step of heating the inside of the heating furnace. The third step is performed after the first step and the second step are performed. Preferably, an atmosphere including oxygen is provided in the heating furnace before the inside of the heating furnace is heated. More preferably, the fluoride is lithium fluoride and the magnesium compound is magnesium fluoride.