Cathode Material With Functionalized CNTs for Mn Dissolution Control
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Solution Overview
Problem
Lithium-ion batteries face manganese dissolution issues during charging and discharging, leading to irreversible losses and poor cycling performance due to manganese-containing active materials reacting with the electrolyte, resulting in reduced battery life and efficiency.
Innovation Solution
Incorporating a functionalized carbon nanotube with lone pair electrons into the positive electrode material, which forms a coordination structure with Mn2+ ions to reduce dissolution and enhance cycling performance by improving electron transmission and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If manganese-containing active material is used in the positive electrode, then high energy storage density and high open-circuit voltage are achieved, but manganese dissolution occurs during charging and discharging leading to poor cycling performance
Solution Approach 1:
A functionalized carbon nanotube is introduced as an intermediary substance between the manganese-containing active material and the electrolyte. The carbon nanotube surface contains lone pair electrons that form coordination structures with Mn2+ ions, preventing their dissolution into the electrolyte while allowing the manganese-containing active material to maintain its high energy storage density and voltage characteristics.
Solution Approach 2:
The positive electrode material is designed as a composite system combining manganese-containing active material with functionalized carbon nanotubes. This composite structure leverages the high energy storage properties of the manganese-containing material while the carbon nanotube component provides protective coordination with Mn2+ ions, resolving the contradiction between energy density and cycling stability.
2Reliability
If functionalized carbon nanotube is added to capture Mn2+ ions, then cycling performance is improved, but device complexity increases
Solution Approach 1:
The functionalization of carbon nanotubes is controlled by adjusting specific parameters such as functionalization degree and the types of functional groups introduced. By optimizing these parameters, the carbon nanotubes achieve effective Mn2+ coordination capability while maintaining a relatively simple overall electrode structure, thus improving cycling performance 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 use of functionalized carbon nanotubes effectively captures dissolved Mn2+ ions, reducing manganese deposition on the negative electrode, improving cycling performance, energy density, and storage capacity while minimizing impedance, thus extending battery life and enhancing overall battery performance.
Implementation Method 1
The lone pair electrons on the surface of the functionalized carbon nanotube have a strong coordination capability. During charging and discharging of the secondary battery, the lone pair electrons can form a coordination structure with Mn2+ dissolved from the manganese-containing active material
Implementation Method 2
The use of functionalized carbon nanotubes effectively captures dissolved Mn2+ ions, reducing manganese deposition on the negative electrode
Data Source
AI summary
Provided are a positive electrode material, a positive electrode plate, a secondary battery, a battery module, a battery pack, and an electrical apparatus. The positive electrode material comprises a manganese-containing active material and a functionalized carbon nanotube, where a surface of the functionalized carbon nanotube comprises lone pair electrons. The lone pair electrons on the surface of the functionalized carbon nanotube have a strong coordination capability. During charging and discharging of the secondary battery, the lone pair electrons can form a coordination structure with Mn2+ dissolved from the manganese-containing active material, to reduce the dissolution of the Mn2+, thereby improving a manganese dissolution phenomenon of the secondary battery, and then improving cycling performance of the secondary battery.