Negative Electrode Boron Compound Mixing for Heat-Stable Batteries
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face challenges in maintaining high-quality battery characteristics when exposed to high temperature environments, particularly in pulse discharge modes at low temperatures.
Innovation Solution
Incorporating a lithium titanium composite oxide, an additive, and a boron compound into the negative electrode mixture, which are mixed together to enhance the battery's thermal stability and reduce reactions with the electrolytic solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is exposed to high temperature environments, then the battery characteristics deteriorate, but the battery needs to operate in pulse discharge mode at low temperature
Solution Approach 1:
A boron compound is introduced as an intermediary substance between the electrolytic solution and the negative electrode active material. The boron compound preferentially reacts with the electrolytic solution to form a protective interface layer, preventing direct contact and harmful reactions between the electrolyte and the negative electrode, thereby maintaining battery characteristics after high temperature exposure
Solution Approach 2:
The invention changes the chemical composition parameters of the negative electrode by incorporating a boron compound (0.01-5 wt% relative to the negative electrode active material). This parameter change modifies the electrode's chemical stability and reactivity characteristics, enabling the battery to maintain performance after high temperature exposure while retaining low-temperature pulse discharge capability
2Ease of manufacture
If conventional negative electrode materials are used, then manufacturing is simple, but reactions with electrolytic solution occur at high temperature
Solution Approach 1:
The boron compound serves as a protective intermediary that is mixed with the negative electrode active material and additive. This intermediary substance preferentially reacts with the electrolytic solution to form a stable interface layer, preventing direct harmful reactions between the electrolyte and conventional negative electrode materials, while maintaining ease of manufacture through simple mixing
Data Source
AI summary
A disclosed non-aqueous electrolyte secondary battery includes a negative electrode. The negative electrode includes a negative electrode mixture containing a lithium titanium composite oxide as a negative electrode active material, an additive, and a boron compound which are mixed with one another. A disclosed method of manufacturing a negative electrode mixture for a non-aqueous electrolyte secondary battery includes a mixing step of mixing a lithium titanium composite oxide as a negative electrode active material, an additive, and a boron compound.