Positive Electrode Additive Coating to Prevent Thermal Deformation
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Solution Overview
Problem
Conventional positive electrode additives in lithium secondary batteries suffer from structural deformation due to temperature during the manufacturing process, leading to degradation of battery characteristics.
Innovation Solution
A method of manufacturing a positive electrode with a two-layer structure, where the first and second mixture layers are formed at controlled temperatures of 40 °C or less, and a positive electrode additive with a specific X-ray diffraction intensity ratio is used to minimize deformation, along with controlled rolling operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional blending methods (3-roll mill, internal mixer, Banbury mixer) are used to mix positive electrode active material particles with positive electrode additive, then mixing can be achieved, but aggregation of particles occurs and production efficiency is poor
Solution Approach 1:
The patent replaces conventional mechanical mixing methods (3-roll mill, internal mixer, Banbury mixer) with a fluidized bed system where air flow suspends particles and enables uniform distribution through fluid dynamics rather than mechanical shear forces, eliminating aggregation while achieving thorough mixing
Solution Approach 2:
The patent employs a fluidized bed structure that creates porous, suspended particle environments allowing uniform additive distribution throughout the active material particles without direct particle-to-particle contact that causes aggregation
2Quantity of substance
If 3-roll mill is used for mixing, then mixing can be achieved, but production efficiency is poor and particle shape changes
Solution Approach 1:
The patent replaces the mechanical rolling and pressing action of the 3-roll mill with a fluidized bed system using air suspension, eliminating mechanical contact that deforms particle shapes while achieving uniform additive distribution through fluid dynamic forces
3Quantity of substance
If internal mixer or Banbury mixer is used for mixing, then mixing can be achieved, but aggregation of particles occurs
Solution Approach 1:
The patent replaces the high-shear mechanical mixing action of internal mixers and Banbury mixers with a fluidized bed system where air suspension and fluid dynamic forces distribute additives uniformly without the intense mechanical forces that cause particle aggregation
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 method prevents structural deformation of the positive electrode additive, maintaining battery characteristics and improving charging capacity and lifetime performance.
Implementation Method 1
a positive electrode additive capable of absorbing/discharging lithium
Data Source
AI summary
Provided are a positive electrode including a positive electrode additive, a method of manufacturing the positive electrode, and a lithium secondary battery including the positive electrode. A coating temperature of a slurry is adjusted when the positive electrode is manufactured, and thus the deformation of the positive electrode additive due to temperature is minimized, and accordingly, structural deformation of the positive electrode additive included in the positive electrode is prevented.