Basic Inorganic Particles for Nonaqueous Battery HF Scavenging
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Solution Overview
Problem
Nonaqueous electrolyte batteries face challenges in achieving superior life characteristics and safety due to the deposition of metal ions, which can lead to reduced battery life and safety issues, and existing HF scavengers are inefficient and lack effective evaluation methods.
Innovation Solution
Incorporating specific basic inorganic particles with controlled physical properties into the nonaqueous electrolyte battery, such as calcium silicate, to effectively remove hydrofluoric acid (HF) and prevent metal ion deposition, thereby enhancing battery safety and life characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HF scavengers are used, then HF removal function is provided, but life characteristics and safety requirements cannot be met
Solution Approach 1:
The patent applies parameter changes by controlling the hydrophilic parameter A (BET1/BET2) of basic inorganic particles within a specific range (0.4 ≤ A ≤ 2.0). This parameter optimization enables the particles to effectively remove HF while satisfying life characteristics and safety requirements, resolving the contradiction between HF removal efficiency and battery reliability.
Solution Approach 2:
The patent uses composite basic inorganic particles that combine specific chemical composition with controlled physical properties (hydrophilic parameter). This composite approach creates materials that simultaneously achieve superior HF scavenging performance and meet stringent safety and life characteristics requirements for lithium ion secondary batteries.
2Measurement precision
If battery cell assembling is performed to evaluate HF scavengers, then actual battery performance can be assessed, but the process becomes complicated and time-consuming
Solution Approach 1:
The patent extracts the essential evaluation function from the complete battery cell assembly process. By using a simplified test cell configuration that contains only the critical components needed to assess HF scavenging performance, the invention enables rapid material screening without the complexity and time consumption of full battery assembly, while still providing meaningful evaluation data.
3Productivity
If aqueous solution evaluation method is used, then HF capture can be assessed without cell assembly, but the battery internal state cannot be reproduced
Solution Approach 1:
The patent introduces a nonaqueous electrolyte solution as an intermediary medium that bridges the gap between simple aqueous evaluation and complex cell assembly. This intermediary approach allows evaluation to be performed without full cell assembly (maintaining efficiency) while reproducing the actual battery chemical environment (ensuring accuracy), thus resolving the contradiction between productivity and reliability in evaluation methods.
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 use of these inorganic particles significantly improves the life characteristics and safety of nonaqueous electrolyte batteries by efficiently reducing HF concentration and preventing battery swelling, while providing an efficient evaluation method for HF scavengers.
Implementation Method 1
basic inorganic particles...effectively remove hydrofluoric acid (HF)...a hydrophilic parameter A of the basic inorganic particles satisfies 0.45≤A(BET1/BET2)≤2.0
Data Source
AI summary
The purpose of the present invention is to provide a nonaqueous electrolyte battery having excellent lifespan characteristics and/or excellent safety, which are essential in practice. The basic inorganic particles for a nonaqueous electrolyte battery according to the present invention include basic inorganic particles, wherein a hydrophilicity parameter A for the basic inorganic particles satisfies the expression: 0.45≤A(BET1/BET2)≤2.0. In the expression, BET1 represents the specific surface area of the basic inorganic particles calculated from an adsorption isotherm which is measured through adsorption of water vapor to the basic inorganic particles by a BET method. BET2 represents the specific surface area of the basic inorganic particles calculated from an adsorption isotherm which is measured through adsorption of nitrogen to the basic inorganic particles by a BET method.