Oxygen-Controlled Negative Electrode Layer for Smooth Li-Ion Anodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The formation of a negative electrode active material layer with low surface roughness and uniform distribution of carbon material and metal is challenging in anodeless lithium-ion secondary batteries, affecting the battery's operating characteristics.
Innovation Solution
A negative electrode with a negative electrode active material layer containing 2 to 10 at% oxygen, uniformly distributing carbon material and metal, improves surface roughness and enhances battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a very thin film negative electrode active material layer is formed, then the battery can be thinned and energy density improved, but it becomes difficult to achieve low surface roughness
Solution Approach 1:
The invention introduces oxygen content as a critical parameter (2-10 at%) to control the properties of the negative electrode active material layer. By adjusting the oxygen content in the carbon material, the invention achieves both low surface roughness and uniform metal distribution while maintaining the thin film structure, thus resolving the contradiction between thinning the battery and achieving manufacturing precision.
Solution Approach 2:
The invention creates a composite structure by incorporating metal particles (0.1-5 at%) into the carbon material matrix with controlled oxygen content. This composite approach allows the thin film layer to achieve both low surface roughness and uniform metal distribution, solving the contradiction between reduced thickness and improved manufacturing precision.
2Reliability
If carbon material and metal are uniformly distributed in the negative electrode active material layer, then battery operating characteristics are improved, but achieving uniform distribution in a thin film is difficult
Solution Approach 1:
The invention uses oxygen content (2-10 at%) as a controlling parameter to achieve uniform metal distribution in the carbon material matrix. The oxygen functional groups on the carbon material surface provide anchoring sites that promote uniform dispersion of metal particles, thereby achieving both reliability improvement and manufacturing precision in the thin film layer.
Solution Approach 2:
The oxygen-containing functional groups on the carbon material act as an intermediary that facilitates uniform distribution of metal particles. These functional groups provide binding sites that prevent metal aggregation and ensure homogeneous distribution throughout the thin film, resolving the contradiction between achieving uniformity and maintaining thin film structure.
Data Source
AI summary
A negative electrode includes a current collector and a negative electrode active material layer, wherein the negative electrode active material layer includes one or more layers, and any one of the one or more layers of the negative electrode active material layer contains oxygen in an amount of 2 to 10 at %. A lithium-ion secondary battery containing the negative electrode and a method of making the negative electrode are also provided.