Lithium Metal Battery Thermal Gradient for Dendrite Control

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Solution Overview

Problem

Lithium metal anodes in rechargeable batteries face challenges such as unstable plating and stripping, leading to dendrite formation and internal short circuits, which are not accurately replicated by current safety testing methods, and hinder the development of safe and efficient lithium metal batteries.

Innovation Solution

A method involving a thermal gradient across the electrodes, where the cooler electrode is maintained at least 1°C warmer than the warmer electrode, to control lithium deposition and minimize dendrite formation, using a thermal gradient to simulate real-world failure conditions for safety testing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If lithium metal is used in anodes to increase capacity, then energy density is improved, but dendrite formation and internal short circuits occur

Engineering Contradiction:

Improveenergy densityVSAvoidinternal short circuit risk

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent applies thermal gradient parameter changes by maintaining different temperatures at the anode and cathode during charging. The anode is kept cooler than the cathode, creating a temperature differential that modifies lithium ion deposition behavior. This parameter change suppresses dendrite formation while preserving the high capacity benefits of lithium metal anodes.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If thermal gradient is applied to control lithium deposition, then dendrite formation is reduced, but device complexity increases

Engineering Contradiction:

Improvedendrite formation controlVSAvoidthermal management system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The thermal management system is segmented into separate temperature control zones for the anode and cathode. Independent temperature control allows each electrode to be optimized separately, with the anode kept cooler to suppress dendrites and the cathode at a higher temperature. This segmentation achieves effective dendrite control while managing the complexity through modular temperature zones.

Inventive Principle:

Principle #1Segmentation

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

This method effectively induces controlled dendrite formation for safety testing, improving the reliability and safety of lithium metal batteries by reducing dendrite-related failures and enhancing long-term cycling stability.

Implementation Method 1

A method involving a thermal gradient across the electrodes, where the cooler electrode is maintained at least 1°C warmer than the warmer electrode

Methodology Applied

Scientific EffectThermal gradient: Temperature Gradient

Implementation Method 2

plating lithium with high overpotentials evinces that Li+-ion diffusion is poor, which will lead to unwanted, high-aspect ratio Li plating morphologies

Methodology Applied

Scientific EffectIon diffusion: Diffusion

Data Source

PatentUS20260018686A1Battery internal short circuit trigger and improved performance method

Publication Date: 2026.01.15 THE GOVERNMENT OF THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY DEPARTMENT OF HEALTH & HUMAN SERVICES

AI summary

Disclosed is a method of: providing an electrochemical energy storage device having a first electrode and a second electrode; and simultaneously: a) maintaining the first electrode and a first temperature; b) maintaining the second electrode at a second temperature; and c) charging or discharging the device. The coolest portion of the second electrode is at least 1° C. warmer than the warmest portion of the first electrode.