Composite Cathode Material for High-Voltage Lithium Battery Conductivity
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Solution Overview
Problem
Existing rechargeable lithium batteries face challenges in achieving high energy density, high operating voltage, and high conductivity, particularly in positive electrode active materials.
Innovation Solution
The positive electrode active material comprises first particles with an olivine-based lithium compound and second particles with specific elemental compositions, along with a conductive material and binder, enhancing electrical conductivity and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a high operating voltage is pursued to increase energy density, then the energy density is improved, but the conductivity deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of Li1.2Mn0.54Co0.13Ni0.13O2 particles combined with conductive carbon materials and binder polymers. This composite structure allows the high-voltage cathode material to maintain its energy density advantage while the conductive additives compensate for the conductivity loss, resolving the contradiction between high operating voltage and electrical conductivity.
2Use of energy by moving object
If the positive electrode active material is optimized for high energy density, then the energy density is improved, but the capacity retention deteriorates
Solution Approach 1:
The patent optimizes the composition parameters of the Li1.2Mn0.54Co0.13Ni0.13O2 material, specifically controlling the ratios of metal elements and the particle size distribution. By adjusting these parameters, the material achieves high energy density while maintaining structural stability that ensures good capacity retention over multiple charge-discharge cycles.
3Use of energy by moving object
If different lithium transition metal oxides are mixed to improve energy density and operating voltage, then the energy density and operating voltage are improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple lithium transition metal oxides (LiCoO2, LiMn2O4, LiNi0.8Co0.1Mn0.1O2) into a single composite cathode material Li1.2Mn0.54Co0.13Ni0.13O2. This merging approach integrates the advantages of different materials (high voltage from LiMn2O4, high capacity from LiNi0.8Co0.1Mn0.1O2) while simplifying the overall structure compared to physical mixtures, thus improving energy density without excessive complexity increase.
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 solution results in a rechargeable lithium battery with improved energy density, operating voltage, and conductivity, particularly at low temperatures, with enhanced capacity retention.
Implementation Method 1
produces electrical energy through the oxidation and reduction reactions when lithium ions are intercalated into and deintercalated from the positive electrode and negative electrode
Implementation Method 2
enhancing electrical conductivity and structural stability
Data Source
AI summary
Positive electrode active materials for a rechargeable lithium battery, positive electrodes including the positive electrode active material, and rechargeable lithium batteries including the positive electrode active material are provided. The positive electrode active material comprises first particles comprising a compound of Lia1Mnz1Fex1Ay1PO4−c1 and second particles comprising a compound of Lia2Nix2Mnz2Xc2O2−b2. The cobalt (Co) content (e.g., amount) in the positive electrode active material is about 100 ppm or less.