Nonplanar Silicon Anode Pre-Lithiation for Uniform Lithium Uptake

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Solution Overview

Problem

Existing methods for pre-lithiating anode electrodes in battery cells face challenges in controlling the pre-lithiation level, leading to high reactivity, low efficiency, and spatial inhomogeneity, particularly with planar silicon electrodes, which limits energy density and cycle life.

Innovation Solution

Employing a nonplanar silicon film, such as a columnar structure, and a lithium-arene complex solution in a controlled chemical process to form a pre-lithiation coating, allowing precise control of lithiation levels through a chemical potential equilibrium.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If planar silicon electrodes are used for pre-lithiation, then the structure is simple and easy to manufacture, but the pre-lithiation level cannot be controlled, leading to high reactivity and spatial inhomogeneity

Engineering Contradiction:

Improveease of manufactureVSAvoidpre-lithiation level control

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent employs a nonplanar silicon film with a columnar structure instead of a planar structure. The curved columnar morphology provides spatial heterogeneity that enables controlled lithiation propagation, solving the problem of spatial inhomogeneity while maintaining manufacturability through deposition processes

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent changes the structural parameter of the silicon film from planar to nonplanar columnar form. This geometric parameter change fundamentally alters the lithiation behavior, enabling controlled pre-lithiation levels by leveraging the curved surface area and internal stress distribution differences

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If planar silicon electrodes are used for pre-lithiation, then the manufacturing process is simple, but the reactivity is high and efficiency is low

Engineering Contradiction:

Improveease of manufactureVSAvoidpre-lithiation efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The columnar nonplanar structure reduces overall reactivity by distributing lithium insertion sites across curved surfaces and internal interfaces, preventing runaway reactions while maintaining efficient lithium uptake. The curved geometry provides controlled reaction pathways that improve pre-lithiation efficiency

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Device complexity

If planar silicon electrodes are used for pre-lithiation, then the structure is simple, but spatial inhomogeneity occurs

Engineering Contradiction:

Improvestructure complexityVSAvoidspatial homogeneity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The nonplanar columnar structure inherently provides spatial heterogeneity through its curved surfaces and internal architecture. This geometric complexity enables uniform lithium distribution by creating multiple reaction interfaces and reducing preferential reaction sites, thereby achieving spatial homogeneity in pre-lithiation

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Ease of manufacture

If conventional pre-lithiation methods are used, then the process is straightforward, but energy density and cycle life are limited

Engineering Contradiction:

Improveease of manufactureVSAvoidcycle life

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The columnar nonplanar structure improves cycle life by providing a stable framework that accommodates lithium insertion and extraction. The curved columnar morphology reduces mechanical stress concentration and prevents electrode degradation, enhancing battery reliability and cyclability

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

By changing the silicon film structure from planar to nonplanar columnar form, the patent fundamentally improves electrochemical performance. The geometric parameter change enables better lithium ion transport pathways and reduces degradation mechanisms, extending cycle life

Inventive Principle:

Principle #35Parameter changes

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 method enhances energy density and cyclability of battery cells by achieving homogeneous pre-lithiation with controlled areal capacity and reduced electrolyte decomposition, improving discharge efficiency and cycle life.

Implementation Method 1

allowing precise control of lithiation levels through a chemical potential equilibrium

Methodology Applied

Scientific EffectChemical potential equilibrium: Chemical Bonding

Implementation Method 2

heating the anode electrode to remove the organic solvent and the arene after the predetermined period

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS20250210621A1High performance anode electrode including silicon film with controlled pre-lithiation

Publication Date: 2025.06.26 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A method for manufacturing a battery cell includes providing an anode electrode including a nonplanar silicon film arranged on an anode current collector; immersing the anode electrode in a solution comprising lithium metal, an arene, and an organic solvent for a predetermined period to form a pre-lithiation coating on the nonplanar silicon film; and heating the anode electrode to remove the organic solvent and the arene after the predetermined period.