Cylindrical Lithium Cathode Particles for Heat and Gas Reduction

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Solution Overview

Problem

Large cylindrical lithium secondary batteries face safety concerns due to increased heat and gas generation, leading to potential explosions and reduced output, especially during quick charging.

Innovation Solution

The use of single particles or quasi-single particles as positive electrode active material in lithium secondary batteries, with a minimum particle size (Dmin) of 1.0 μm or more, to enhance thermal stability and minimize gas generation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the battery volume is increased to achieve high capacity, then the energy storage capacity is improved, but the heat generation increases and safety deteriorates

Engineering Contradiction:

Improvebattery capacityVSAvoidheat generation

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent changes the particle size parameter of the positive electrode active material to Dmin of 1.0 μm or more, which fundamentally alters the thermal behavior of the battery system. This parameter change reduces heat generation during charging and discharging while maintaining high capacity, directly resolving the contradiction between battery capacity and heat generation.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If the battery volume is increased to achieve high capacity, then the energy storage capacity is improved, but the risk of explosion increases

Engineering Contradiction:

Improvebattery capacityVSAvoidbattery safety

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

By changing the particle size parameter to Dmin of 1.0 μm or more, the patent reduces gas generation and internal pressure buildup during battery operation. This parameter change enhances thermal stability and prevents explosion risks even in large-capacity batteries, resolving the contradiction between capacity and safety.

Inventive Principle:

Principle #35Parameter changes

3Speed

If quick charging is performed at high voltage, then the charging speed is improved, but a large amount of heat is generated around the electrode tab

Engineering Contradiction:

Improvecharging speedVSAvoidheat generation at electrode tab

Core Design Contradiction:

SpeedVSTemperature

Solution Approach 1:

The patent changes the particle size parameter of the positive electrode active material to Dmin of 1.0 μm or more, which reduces overall heat generation during high-voltage quick charging. This parameter change mitigates the temperature rise around electrode tabs, enabling fast charging while maintaining safety.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12308429B2Lithium secondary battery

Publication Date: 2025.05.20 LG ENERGY SOLUTION LTD

AI summary

A lithium secondary battery which includes an electrode assembly in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction, a battery can in which the electrode assembly is accommodated, and a sealing body which seals an open end of the battery can. The positive electrode plate includes positive electrode active material comprising single particles, quasi-single particles, or a combination thereof, and the positive electrode active material has Dmin of 1.0 μm or more.