Lithium Secondary Battery Electrode Composition for Lower Resistance
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Solution Overview
Problem
Existing lithium secondary batteries face challenges in improving resistance characteristics, which affect their performance and efficiency.
Innovation Solution
The lithium secondary battery incorporates specific active materials and conductive materials at the positive and negative electrodes, including lithium composite transition metal compounds, silicon oxide, and graphite, along with various types of conductive materials to enhance conductivity and reduce cell resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode materials and conductive materials are used, then battery structure is simple, but resistance characteristics are insufficient
Solution Approach 1:
The patent applies composite materials by combining multiple types of conductive materials (particulate, linear, and planar) with electrode active materials to form composite electrode structures. This resolves the contradiction by improving resistance characteristics through material composition while managing the increased structural complexity through systematic integration of the conductive material components.
Solution Approach 2:
The patent applies local quality by distributing different types of conductive materials (particulate, linear, and planar) throughout the electrode structure to create localized conductive pathways. This improves overall resistance characteristics by ensuring conductive properties are present at critical locations within the electrode, addressing the contradiction between reliability and complexity.
2Productivity
If conventional conductive materials are used, then electrode structure is simple, but rapid charging capability is insufficient
Solution Approach 1:
The patent combines three distinct types of conductive materials (particulate, linear, and planar) in the electrode composition to enhance rapid charging capability. This composite approach creates multiple conductive pathways that facilitate faster ion and electron transport, directly improving productivity while the systematic integration manages the complexity of the multi-component system.
Solution Approach 2:
The patent segments the conductive material function into three distinct types (particulate, linear, and planar), each contributing differently to the overall conductive network. This segmentation allows each material type to perform its specific function optimally, improving rapid charging capability while organizing the complexity into manageable functional segments.
Data Source
AI summary
A lithium secondary battery includes: a positive electrode; a separator; and a negative electrode. The positive electrode includes a positive electrode active material and a positive electrode conductive material. The negative electrode includes a negative electrode active material and a negative electrode conductive material. The positive electrode active material includes a lithium composite transition metal compound including nickel (Ni) and cobalt (Co), and the negative electrode active material includes silicon oxide, artificial graphite, and natural graphite. The positive electrode conductive material includes a particulate conductive material, a linear conductive material, and a planar conductive material, and the negative electrode conductive material includes a particulate conductive material, a linear conductive material, and a planar conductive material.