Electrolyte Additives for Lithium-Ion Battery Hot-Box Stability
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Solution Overview
Problem
Lithium-ion batteries face challenges in achieving high-safety and long-life performance, particularly in terms of hot-box performance and room-temperature cycling stability, as they become thinner and more portable, requiring improved electrolytes to enhance their high-temperature and voltage stability.
Innovation Solution
The development of an electrolyte comprising a compound of formula I, lithium difluorophosphate, and additional additives such as acrylonitrile, malononitrile, and fluoroethylene carbonate, which are combined in specific ratios to improve the cycling stability and hot-box performance of electrochemical apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in lithium-ion batteries, then the batteries can achieve basic operating function, but the hot-box performance and room-temperature cycling stability are insufficient
Solution Approach 1:
The patent employs a composite electrolyte system combining multiple additives (compound of formula I, lithium difluorophosphate, and other auxiliary additives) to achieve synergistic effects. This composite approach allows the electrolyte to simultaneously improve hot-box performance, cycling stability, and high-temperature stability by forming comprehensive protective films on electrodes through the combined action of different additive components.
Solution Approach 2:
The patent optimizes specific parameter ranges including the content ratio of compound of formula I (0.01-5%), lithium difluorophosphate (0.01-1%), and auxiliary additives (0.1-5%), along with their molar ratios. By precisely controlling these compositional parameters, the electrolyte achieves optimal balance between hot-box performance, cycling stability, and high-temperature resistance without sacrificing basic battery function.
2Weight of moving object
If the battery is made thinner and more portable, then portability is improved, but safety and long-life performance become more difficult to achieve
Solution Approach 1:
The patent applies local quality improvement by forming protective films specifically on electrode surfaces through the electrolyte additives. The compound of formula I and lithium difluorophosphate preferentially deposit on electrode interfaces to create localized protective layers that enhance safety and stability precisely where needed (at electrode-electrolyte interfaces) without adding bulk to the overall battery structure, thus maintaining portability while improving reliability.
3Duration of action of stationary object
If electrolyte additives are added to improve cycling stability, then room-temperature cycling performance is enhanced, but the complexity of electrolyte composition increases
Solution Approach 1:
The patent achieves multi-functionality by designing an electrolyte system where the compound of formula I and lithium difluorophosphate perform multiple functions simultaneously: they improve room-temperature cycling stability, enhance hot-box performance, provide high-temperature stability, and form protective films on electrodes. This universal approach allows a single additive system to address multiple performance requirements without proportionally increasing complexity.
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 proposed electrolyte significantly enhances the high-temperature storage and cycling performance of lithium-ion batteries, improving safety and stability by forming protective films on electrodes and reducing impedance, thereby increasing the pass rate in hot-box tests and extending cycle life.
Implementation Method 1
The electrolyte includes a compound of formula I and lithium difluorophosphate... significantly improves hot-box performance and room-temperature cycling performance... forming protective films on electrodes
Implementation Method 2
The proposed electrolyte significantly enhances the high-temperature storage and cycling performance... by forming protective films on electrodes and reducing impedance
Data Source
AI summary
An electrolyte, including a compound of formula I and lithium difluorophosphate, where X is selected from a substituted or unsubstituted C1-10 alkyl group, a substituted or unsubstituted C2-10 alkenyl group, a substituted or unsubstituted C1-5 alkyl sulfonyl group, and a substituted or unsubstituted C2-5 acyl group. In the case of substitution, a substituent is selected from a cyano group and halogen. This application further relates to an electrochemical apparatus and an electronic apparatus that include the electrolyte.