Positive Electrode Additive Coating Temperature to Prevent Deformation
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Solution Overview
Problem
Conventional positive electrode additives in lithium secondary batteries suffer from structural deformation due to temperature fluctuations during the manufacturing process, leading to degradation of battery characteristics.
Innovation Solution
A method of manufacturing a positive electrode for lithium secondary batteries involving the application of slurry at controlled temperatures (≤40°C) and rolling operations to minimize deformation, using a two-layer structure with specific XRD peak intensity ratios and a positive electrode additive composed of lithium cobalt oxide with controlled doping elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional positive electrode additives are used in lithium secondary batteries, then charging/discharging characteristics and lifetime characteristics are improved, but thermal stability deteriorates causing structural deformation under temperature influence during manufacturing
Solution Approach 1:
The patent applies parameter changes by precisely controlling the coating temperature of the slurry to 40°C or less during the manufacturing process. This temperature parameter control prevents thermal deformation of the positive electrode additive while maintaining its electrochemical performance, resolving the contradiction between reliability and thermal stability.
2Productivity
If the coating temperature of slurry is increased during positive electrode manufacturing, then manufacturing efficiency is improved, but structural deformation of positive electrode additive occurs
Solution Approach 1:
The patent changes the temperature parameter to 40°C or less during slurry coating to prevent structural deformation of the positive electrode additive. This parameter control ensures manufacturing precision is maintained while the process remains efficient.
Solution Approach 2:
The patent uses XRD analysis with specific peak intensity ratios (A/B≤1 at 2θ=38.5° and 47.9°) as feedback to monitor and control the structural integrity of the positive electrode additive during manufacturing, ensuring temperature control effectiveness.
3Device complexity
If temperature control during slurry coating is not implemented, then manufacturing process complexity is reduced, but battery characteristics degrade due to additive deformation
Solution Approach 1:
The patent implements a specific temperature parameter control (≤40°C) during slurry coating, which adds controlled complexity to the manufacturing process but is necessary to maintain battery characteristics and prevent additive deformation.
Solution Approach 2:
The patent introduces XRD analysis with defined peak intensity ratio criteria (A/B≤1) as a feedback mechanism to verify that temperature control has been effective, ensuring battery characteristics are maintained through measurable structural integrity.
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.