Monocrystalline Cathode Battery Cell for Electrolyte Infiltration
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Solution Overview
Problem
Existing battery technologies face challenges in achieving high energy density and long cycle life, particularly due to issues with electrolyte solution infiltration and structural stability of lithium-containing transition metal oxides.
Innovation Solution
The battery cell design incorporates a positive electrode active material with layered lithium-containing transition metal oxide in monocrystalline morphology, optimized dimensions (length to width ratio of 2.0 to 10.5) and electrode assembly structures to enhance electrolyte infiltration and ion transmission, along with differential coating of negative electrode active materials to improve power performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery cell length is increased to improve energy density, then the energy density is improved, but the electrolyte solution infiltration ability deteriorates
Solution Approach 1:
The patent optimizes the battery cell's length-to-width ratio parameter within the specific range of 2.0 to 10.5, and sets the length to at least 180 mm. This parameter optimization enables the battery to achieve high energy density while maintaining adequate electrolyte solution infiltration capability, resolving the contradiction between increasing cell size for energy density and preserving infiltration ability.
2Quantity of substance
If the battery cell length is increased to improve energy density, then the energy density is improved, but the cycle life deteriorates
Solution Approach 1:
The patent specifies optimizing the battery cell dimensions with length-to-width ratio between 2.0 and 10.5, and length of at least 180 mm. This dimensional parameter optimization achieves high energy density while maintaining long cycle life, resolving the contradiction between energy density improvement and cycle life preservation.
3Quantity of substance
If lithium-containing transition metal oxide is used as positive electrode active material to improve capacity, then the capacity is improved, but the structural stability deteriorates
Solution Approach 1:
The patent employs lithium-containing transition metal oxide as the positive electrode active material, which provides high capacity. The material is used in conjunction with optimized electrode structure and controlled cell dimensions (length-to-width ratio of 2.0 to 10.5, length ≥180 mm) to maintain structural stability during cycling, thus resolving the contradiction between high capacity and structural stability.
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 design achieves high energy density and long cycle life by ensuring effective electrolyte infiltration, reducing side reactions, and maintaining structural stability, thereby enhancing battery performance.
Implementation Method 1
transmission of lithium ions is facilitated
Implementation Method 2
electrolyte solution infiltration in an entire region of the electrode assembly including a central region can be further improved
Data Source
AI summary
A battery cell includes an electrode assembly and an outer package. The electrode assembly includes a positive electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode film layer arranged on at least one surface of the positive electrode current collector. The positive electrode film layer includes a positive electrode active material. The positive electrode active material includes layered lithium-containing transition metal oxide in monocrystalline morphology. A length of the battery cell is denoted as a, and a width of the battery cell is denoted as b. a is greater than or equal to 180 mm, and a/b ranges from 2.0 to 10.5.