Lithium Primary Battery Anode Alloy for Capacity Retention

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Solution Overview

Problem

Battery capacity decreases due to degradation of the negative electrode in lithium primary batteries, particularly due to expansion during discharge and side reactions with the electrolyte solution, especially in high-temperature environments.

Innovation Solution

Incorporating a lithium alloy with a magnesium content of 10% by mass or less in the negative electrode, along with additives like cyclic imide compounds, phthalic acid ester compounds, and isocyanate compounds in the nonaqueous electrolyte solution, enhances the strength of the negative electrode and inhibits side reactions, thereby maintaining capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If metal lithium or lithium alloy is used for the negative electrode, then high energy density is achieved, but battery capacity decreases due to degradation of the negative electrode

Engineering Contradiction:

Improveenergy densityVSAvoidbattery capacity

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent changes the compositional parameters of the lithium alloy by precisely controlling the magnesium content to be 10% by mass or less. This parameter optimization resolves the contradiction by achieving the right balance between maintaining high energy density (through lithium alloy usage) and preventing negative electrode degradation (through controlled magnesium addition that enhances structural stability)

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite lithium alloy material combining lithium with controlled amounts of magnesium (10% by mass or less). This composite approach allows the material to benefit from both the high energy density of lithium and the degradation-resistant properties of magnesium, simultaneously addressing both requirements of the contradiction

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If lithium alloy is used in high-temperature environments, then operational flexibility is improved, but side reactions with electrolyte solution increase causing capacity degradation

Engineering Contradiction:

Improveoperational flexibilityVSAvoidside reactions with electrolyte solution

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes the compositional parameters of the lithium alloy by limiting magnesium content to 10% by mass or less. This parameter control enhances the electrochemical stability of the negative electrode, reducing its reactivity with the electrolyte solution while maintaining operational flexibility across different temperature conditions

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260051516A1Lithium primary battery

Publication Date: 2026.02.19 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A lithium primary battery inches a positive electrode, a negative electrode, and a nonaqueous electrolyte solution. The positive electrode contains manganese dioxide and the negative electrode contains a lithium alloy. The lithium alloy contains magnesium. The percentage content of the magnesium in the lithium alloy is 10% by mass or less.