Secondary Battery Electrode Films for Stable Cation Migration
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Solution Overview
Problem
Existing secondary batteries do not achieve sufficient battery characteristics, necessitating improvements in their configuration to enhance performance.
Innovation Solution
A secondary battery design incorporating a positive electrode with a nitrogen and boron-containing positive electrode film, a nitrogen and boron-containing negative electrode film, and an electrolyte salt and additive that includes specific ester compounds and nitrogen-boron-containing anions, optimized through X-ray photoelectron spectroscopy to improve battery characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte and electrode configurations are used, then the battery structure is simple, but the battery characteristic is insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the electrolyte composition with specific additives (lithium monofluorophosphate and lithium difluorophosphate) and controlling the concentration ratios of carbonate esters to improve battery characteristics. The electrode film compositions are also optimized with specific nitrogen and boron compound ratios to enhance performance while managing complexity
Solution Approach 2:
The patent employs composite materials by combining multiple electrolyte components (cyclic carbonate esters, chain carbonate esters, carboxylic acid esters) with specific additives to create a composite electrolyte system. The electrode films are also constructed as composites containing nitrogen compounds, boron compounds, and conductive materials to achieve superior battery characteristics
2Reliability
If electrode films with nitrogen and boron compounds are used, then battery characteristic improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for the electrode films, including nitrogen compound content (0.1-10 wt%), boron compound content (0.1-10 wt%), and specific XPS peak positions (N1s: 395-405 eV, B1s: 188-198 eV). These controlled parameters ensure consistent battery performance while providing clear manufacturing specifications
Solution Approach 2:
The patent replaces traditional mechanical or chemical characterization methods with X-ray photoelectron spectroscopy (XPS) analysis to precisely control and verify the electrode film composition. This substitution enables non-destructive, highly precise measurement of surface chemistry without complex mechanical preparation
3Speed
If electrolyte salt with nitrogen-boron anion is used, then cation migration improves, but electrolyte stability requirements increase
Solution Approach 1:
The patent optimizes electrolyte stability by controlling the concentration of lithium monofluorophosphate (0.01-5 wt%) and lithium difluorophosphate (0.01-5 wt%), and maintaining specific ratios between cyclic and chain carbonate esters. These parameter controls enable fast cation migration while preventing electrolyte decomposition
Solution Approach 2:
The patent introduces lithium monofluorophosphate and lithium difluorophosphate as intermediary substances that mediate between the nitrogen-boron anion and the electrode materials. These intermediaries facilitate cation migration while stabilizing the electrolyte composition by forming protective interfaces
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
The described configuration enhances battery performance by stabilizing the electrolyte solution, improving cation migration, and suppressing electrode reactant precipitation, thereby achieving superior battery characteristics.
Implementation Method 1
Based on a surface analysis of the positive electrode by X-ray photoelectron spectroscopy, an N1s spectrum derived from nitrogen and a B1s spectrum derived from boron are detectable
Data Source
AI summary
Provided is a secondary battery. The secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The electrolytic solution includes an electrolyte salt and an additive. The positive electrode includes a positive electrode active material layer, and a positive electrode film that covers a surface of the positive electrode active material layer. The positive electrode film includes nitrogen and boron as constituent elements. Based on a surface analysis of the positive electrode by X-ray photoelectron spectroscopy, an N1s spectrum derived from nitrogen and a B1s spectrum derived from boron are detectable, the N1s spectrum has a peak position within a range of greater than or equal to 395 eV and less than or equal to 405 eV, and the B1s spectrum has a peak position within a range of greater than or equal to 188 eV and less than or equal to 198 eV.