Ternary Li-Ion Cathode Structure for Cycle Life and Low Gas
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Solution Overview
Problem
The cycle life and gas production of ternary lithium-ion batteries need to be improved to meet the increasing demands of portable electronic devices and electric vehicles.
Innovation Solution
A secondary battery design incorporating a nickel-cobalt-manganese ternary material with magnesium and aluminum, an inorganic additive, and a dinitrile compound in the electrolyte solution, which synergistically enhances the positive electrode interface film to improve capacity retention and reduce gas production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a nickel-cobalt-manganese ternary material is used in the positive electrode, then charging efficiency is improved, but cycle life deteriorates and gas production increases
Solution Approach 1:
The patent modifies the chemical composition parameters of the nickel-cobalt-manganese ternary material by introducing a fifth element (Fe, Co, Mn, Ni, Cu, Zn, Sr, or Ba) at controlled concentrations (0.1-5 wt%). This parameter change optimizes the material's structural stability and electrochemical properties, improving cycle life while maintaining charging efficiency. The specific element selection and concentration control adjust the crystal structure and surface properties to reduce degradation during cycling.
Solution Approach 2:
The patent creates a composite positive electrode material by combining nickel-cobalt-manganese ternary oxide with a fifth element compound. This composite structure leverages the high capacity of the ternary material while the fifth element provides structural reinforcement and stability. The composite approach allows synergistic effects where the fifth element mitigates the inherent instability of the nickel-rich ternary structure, resolving the contradiction between charging efficiency and cycle life.
2Use of energy by moving object
If a nickel-cobalt-manganese ternary material is used in the positive electrode, then charging efficiency is improved, but gas production increases
Solution Approach 1:
The patent adjusts the chemical composition parameters of the nickel-cobalt-manganese ternary material by incorporating a fifth element at optimized concentrations. This parameter modification suppresses side reactions between the electrolyte and the positive electrode material, particularly reducing electrolyte decomposition that leads to gas generation. The fifth element acts as a buffer that stabilizes the electrode-electrolyte interface, maintaining high charging efficiency while minimizing harmful gas production.
3Reliability
If the positive electrode material layer is enhanced to improve capacity retention, then the structure becomes more complex
Solution Approach 1:
The patent merges the functions of multiple components into a single integrated positive electrode material layer. Instead of using separate coating layers and additives, the fifth element is incorporated directly into the nickel-cobalt-manganese ternary material matrix, creating a unified composite structure. This merging approach simplifies the overall electrode architecture while achieving improved capacity retention through the synergistic effects of the composite material itself.
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 battery exhibits improved capacity retention rates and reduced residual gas, achieving enhanced performance under high- and low-temperature conditions.
Implementation Method 1
The positive electrode material layer in the secondary battery provided in this application can interact synergistically with the dinitrile compound in the electrolyte solution to improve the toughness of the positive electrode interface film
Implementation Method 2
A secondary battery, also known as a rechargeable battery, is a type of battery that is repeatedly chargeable and dischargeable
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolyte solution. The positive electrode includes a positive current collector and a positive electrode material layer. The positive electrode material layer includes a first material layer and a second material layer. The second material layer is disposed between the positive current collector and the first material layer. The first material layer includes a nickel-cobalt-manganese ternary material. The nickel-cobalt-manganese ternary material includes a first element. The first element includes magnesium and aluminum. The second material layer includes an inorganic additive. The inorganic additive includes a second element. The second element includes at least one of titanium, chromium, yttrium, zirconium, lanthanum, niobium, indium, tin, zinc, or antimony. The electrolyte solution includes a dinitrile compound. The secondary battery exhibits a good capacity retention rate and a relatively small amount of residual gas.