Non-Aqueous Battery Electrolyte Tuning for Uniform Anode Coating
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Solution Overview
Problem
The existing manufacturing process for non-aqueous electrolyte rechargeable batteries faces issues with sodium contamination, leading to uneven coatings on the negative electrode due to the reaction between lithium bis(oxalato)borate and sodium, which affects the battery's performance and lifespan.
Innovation Solution
A non-aqueous electrolyte rechargeable battery with a sodium concentration between 532 ppm and 71,100 ppm and a lithium bis(oxalato)borate equivalent concentration of 0.35 wt% to 0.56 wt% is used, ensuring a balanced coating formation and maintaining high delamination resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium bis(oxalato)borate is added to the non-aqueous electrolyte to form a protective coating on the negative electrode, then the coating protects the surface of the negative electrode, but when sodium exists in the negative electrode, the lithium bis(oxalato)borate reacts with the sodium and causes unevenness when forming the coating
Solution Approach 1:
The patent changes the concentration parameters of both sodium in the negative electrode (532-71100 ppm) and lithium bis(oxalato)borate in the electrolyte (0.35-0.56 wt%). By optimizing these parameters within specific ranges, the patent achieves a balance where the LiBOB forms a uniform protective coating on the negative electrode without excessive reaction with sodium, thus resolving the contradiction between coating protection and uniformity
Solution Approach 2:
The patent creates a composite structure by allowing controlled reaction between lithium bis(oxalato)borate and sodium to form a composite coating layer. This composite material approach transforms the harmful reaction into a beneficial process, where the reaction products contribute to forming a uniform and stable protective coating on the negative electrode surface
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 achieves a stable and uniform coating on the negative electrode, enhancing the battery's input/output characteristics and extending its lifespan by optimizing the sodium and lithium bis(oxalato)borate concentrations.
Implementation Method 1
lithium bis(oxalato)borate reacts with the sodium and causes unevenness when forming the coating
Data Source
AI summary
A non-aqueous electrolyte rechargeable battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode has a sodium concentration of greater than 532 ppm and less than 71100 ppm. The non-aqueous electrolyte rechargeable battery includes a LiBOB equivalent. The LiBOB equivalent is lithium bis(oxalato)borate in the non-aqueous electrolyte or a substance formed when the lithium bis(oxalato)borate reacts with another substance. The non-aqueous electrolyte has a hypothetical concentration of the LiBOB equivalent of 0.35 wt % or greater and 0.56 wt % or less when an amount of the LiBOB equivalent is converted into a weight of the lithium bis(oxalato)borate.