Fluorinated Li-Rich Cathode Material for Better Battery Load Characteristics
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries using Li-excess LixMn1-xO2 materials with a rock-salt structure have low load characteristics, limiting their practical application.
Innovation Solution
Introducing a predetermined amount of fluoride ions into the lithium-transition metal composite oxide and incorporating Li into the tetrahedral site of the crystal structure to form a cation-rich rock-salt related structure, represented by LiaMnbMcO2−xFx, enhances the load characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Li-excess LixMn1-xO2 material with rock-salt structure is used as positive electrode active material, then battery capacity is improved, but load characteristic deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the compositional formula to LiaMnbMcO2−xFx, where fluorine (F) is introduced as a substitution element. This changes the chemical composition parameters of the rock-salt structure material, transforming it from a simple Li-excess composition to a fluorinated composite oxide that maintains high capacity while improving load characteristics through altered electronic and ionic properties
Solution Approach 2:
The patent employs composite materials by creating a lithium-transition metal composite oxide with fluorine substitution (LiaMnbMcO2−xFx). This composite structure combines lithium, transition metals (Ni, Co, Mn, Fe), and fluorine in specific ratios, forming a multi-element compound that synergistically provides both high capacity and improved load characteristics that single-element materials cannot achieve
Data Source
AI summary
This positive electrode active material for a non-aqueous electrolyte secondary battery contains a lithium-transition metal composite oxide that has a rock salt-related structure and is represented by the compositional formula LiaMnbMcO2−XFx (in the formula: M is at least one metal element excluding Li and Mn; 2.000<a+b+c≤2.195; 1.0<a≤1.4; 0.4≤b≤0.9; 0≤c≤0.2; and 0.2≤x≤0.6). The metal element M preferably is at least one selected from Ni, Sn, Mo, Ti, W, Zn, and Al.