Lithium Ion Battery Negative Electrode Conductive Assistant Ratio
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Solution Overview
Problem
Conventional lithium ion secondary batteries do not adequately improve output characteristics at both low and room temperatures, with existing solutions focusing primarily on low-temperature improvements.
Innovation Solution
A lithium ion secondary battery design incorporating a negative electrode mix layer with a graphite-type material, metal oxide, and a carbon-based conductive assistant that does not dope or dedope lithium ions, with a specific mixing ratio of 0.4 weight % to 1.2 weight % of the conductive assistant, to enhance performance at both low and room temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a composite negative electrode material including graphite material, non-graphitic material, and mixed metal materials is used, then output characteristics at low temperature are improved, but output characteristics at room temperature are not improved
Solution Approach 1:
The patent changes the material composition parameters by introducing a specific conductive assistant (carbon material) at controlled ratios (0.4-1.2 wt%) into the negative electrode mix layer. This parameter adjustment simultaneously improves both low-temperature output characteristics and room-temperature output characteristics, resolving the contradiction where previous solutions only improved low-temperature performance.
Solution Approach 2:
The patent creates a composite negative electrode material system combining graphite-type material, metal oxide, and conductive assistant (carbon material). This composite structure provides synergistic effects where the conductive assistant enhances electron conductivity across different temperature conditions, improving output characteristics at both low and room temperatures simultaneously.
2Power
If conductive assistant ratio is increased to improve output characteristics, then resistance decreases, but excessive amount may harm battery performance
Solution Approach 1:
The patent precisely controls the conductive assistant ratio parameter within 0.4-1.2 wt% of the negative electrode mix layer. This optimized parameter range achieves the optimal balance between improving output characteristics (reducing resistance) and maintaining overall battery performance, avoiding the harmful effects of excessive conductive assistant addition.
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
This configuration improves output characteristics and reduces resistance at low temperatures while maintaining performance at room temperature, effectively addressing the limitations of existing battery technologies.
Implementation Method 1
the conductive assistant is a carbon material that does not dope or dedope lithium ions
Implementation Method 2
a negative electrode mix layer contains a graphite-type material, metal oxide, and a conductive assistant
Data Source
AI summary
An object of the present invention is to provide a lithium ion secondary battery enabling improvement of output characteristics at the time of charge and discharge at low temperature and at room temperature. A lithium ion secondary battery according to the present invention for achieving the above object includes a positive electrode plate (11) including a positive electrode mix layer, and a negative electrode plate (12) including a negative electrode mix layer (45). The negative electrode mix layer (45) contains a graphite-type material (42), metal oxide (44), and a conductive assistant (43). The conductive assistant (43) is a carbon material that does not dope or dedope lithium ions, and a mixing ratio of the conductive assistant (43) is 0.4 weight % or more and less than 1.2 weight % of weight of the negative electrode mix layer (45).