Polymer Composite Cathode for High-Voltage Rapid Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for improved materials compatible with lithium secondary batteries that offer high operating potential and rapid charging capabilities, particularly for applications in small portable electronics and environmentally friendly vehicles.
Innovation Solution
A polymer with a specific repeating unit, represented by Formula 1a or Formula 1b, is used to create a composite positive active material, which includes a metal oxide and is integrated into the lithium secondary battery's electrode, enhancing its oxidation-reduction potential and enabling high-rate charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional materials are used in lithium secondary batteries, then the battery structure is simple and easy to manufacture, but the operating potential and charging rate are limited
Solution Approach 1:
The patent applies composite materials by combining a polymer compound with specific chemical structures (containing heteroatoms like O, S, N, or halogens in cyclic groups) with metal oxides or sulfides as positive active materials. This composite structure enables high operating potential (4.0-5.0 V vs. Li/Li+) and rapid charging capabilities while maintaining structural stability during charge-discharge cycles, directly resolving the contradiction between achieving high power/charging rate and managing material complexity
2Productivity
If high operating potential materials are used, then the battery capacity and charging speed improve, but the materials become unstable and decompose during charging
Solution Approach 1:
The patent changes the chemical parameters of the polymer material by incorporating specific heteroatomic groups (O, S, N, or halogens) in cyclic structures with defined molecular weights and functional groups. These parameter changes enable the material to maintain stability at high operating potentials (4.0-5.0 V) while supporting rapid charging, as the specific molecular structure prevents decomposition during high-rate charging cycles
Solution Approach 2:
The patent applies local quality by designing specific functional groups and molecular structures at particular locations within the polymer chain. The polymer contains cyclic groups with heteroatoms (O, S, N, or halogens) at specific positions, creating localized regions with enhanced stability and electron-withdrawing properties that prevent decomposition while enabling high operating potential and rapid charging
3Loss of time
If rapid charging technology is implemented, then the charging time is reduced, but the battery requires advanced materials with specific chemical structures
Solution Approach 1:
The patent changes material parameters by specifying polymers with molecular weights of 400-100,000 Daltons and particular functional group compositions (heteroatomic cyclic groups). These parameter specifications enable rapid charging capability while providing clear synthesis targets that balance manufacturing feasibility with performance requirements
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 polymer composite active material improves the lithium secondary battery's capacity and charge rate, maintaining stability and preventing decomposition during high-rate charging, thus supporting high-capacity and rapid charging capabilities.
Implementation Method 1
a repeating unit of the polymer compound may have a structure represented by at least one of Formula 1a or Formula 1b... the polymer compound... facilitates lithium ion insertion and extraction
Implementation Method 2
the polymer compound... enabling high-rate charging... improving the lithium secondary battery's capacity and charge rate
Data Source
AI summary
A polymer includes a repeating unit represented by at least one of Formula 1a or Formula 1b:wherein, in Formulae 1a or 1b, CY1 is a group represented by at least one of Formula 1-2 or Formula 1-4, CY2 is a group represented by Formula 1-3, and L1, L2, a1, and a2 are defined the same as in the specification, andin Formulae 1-2, Formula 1-3, or 1-4, X, Y, R1, R2, R11 to R14, b1, b2, R21, R22, b21, b22, Z1, Z2, c1, and c2 are defined the same as in the specification.