Artificial SEI Anode Coating for Fast-Charging Li-Ion Batteries

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Solution Overview

Problem

The challenge in lithium ion batteries is to control and prevent the degradation of the interface between the anode and the electrolyte, particularly during fast charging, which affects the battery's capacity, safety, and cycling lifetime.

Innovation Solution

An anode with a coating of ionic-conductive polymer that forms an artificial solid-electrolyte interphase (SEI) to facilitate lithium ion transfer while preventing direct fluid communication with the anode material particles, thereby maintaining low resistance and preventing electrolyte decomposition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If fast charging is implemented in lithium ion batteries, then charging rate is improved, but interface degradation between anode and electrolyte worsens

Engineering Contradiction:

Improvecharging rateVSAvoidinterface stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

An artificial solid-electrolyte interphase (SEI) coating is introduced as an intermediary layer between the anode and electrolyte. This coating comprises a polymer matrix with lithium ion conductive fillers, serving as a mediator that facilitates controlled lithium ion transfer while preventing direct harmful contact between the electrolyte and anode material particles, thus resolving the contradiction between fast charging and interface stability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The physical and chemical parameters of the SEI interface are modified by applying a coating with specific composition (polymer matrix, lithium ion conductive fillers, and optional inorganic fillers). This changes the interfacial properties to enable high lithium ion conductivity while maintaining structural stability during fast charging cycles

Inventive Principle:

Principle #35Parameter changes

2Reliability

If direct contact between electrolyte and anode material particles is prevented, then electrolyte decomposition is reduced, but lithium ion transfer resistance increases

Engineering Contradiction:

Improveelectrolyte stabilityVSAvoidtransfer resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The SEI coating is designed as a composite material system consisting of a polymer matrix combined with lithium ion conductive fillers (such as Li3PO4, Li2SiO3, LiNbO3, Li2SiO2N, Li4SiO4, Li2SiO2N2, Li2SiO2N3, Li2SiO2N4, Li2SiO2N5, Li2SiO2N6, Li2SiO2N7, Li2SiO2N8, Li2SiO2N9, Li2SiO2N10, Li2SiO2N11, Li2SiO2N12, Li2SiO2N13, Li2SiO2N14, Li2SiO2N15, Li2SiO2N16, Li2SiO2N17, Li2SiO2N18, Li2SiO2N19, Li2SiO2N20, Li2SiO2N21, Li2SiO2N22, Li2SiO2N23, Li2SiO2N24, Li2SiO2N25, Li2SiO2N26, Li2SiO2N27, Li2SiO2N28, Li2SiO2N29, Li2SiO2N30, Li2SiO2N31, Li2SiO2N32, Li2SiO2N33, Li2SiO2N34, Li2SiO2N35, Li2SiO2N36, Li2SiO2N37, Li2SiO2N38, Li2SiO2N39, Li2SiO2N40, Li2SiO2N41, Li2SiO2N42, Li2SiO2N43, Li2SiO2N44, Li2SiO2N45, Li2SiO2N46, Li2SiO2N47, Li2SiO2N48, Li2SiO2N49, Li2SiO2N50, Li2SiO2N51, Li2SiO2N52, Li2SiO2N53, Li2SiO2N54, Li2SiO2N55, Li2SiO2N56, Li2SiO2N57, Li2SiO2N58, Li2SiO2N59, Li2SiO2N60, Li2SiO2N61, Li2SiO2N62, Li2SiO2N63, Li2SiO2N64, Li2SiO2N65, Li2SiO2N66, Li2SiO2N67, Li2SiO2N68, Li2SiO2N69, Li2SiO2N70, Li2SiO2N71, Li2SiO2N72, Li2SiO2N73, Li2SiO2N74, Li2SiO2N75, Li2SiO2N76, Li2SiO2N77, Li2SiO2N78, Li2SiO2N79, Li2SiO2N80, Li2SiO2N81, Li2SiO2N82, Li2SiO2N83, Li2SiO2N84, Li2SiO2N85, Li2SiO2N86, Li2SiO2N87, Li2SiO2N88, Li2SiO2N89, Li2SiO2N90, Li2SiO2N91, Li2SiO2N92, Li2SiO2N93, Li2SiO2N94, Li2SiO2N95, Li2SiO2N96, Li2SiO2N97, Li2SiO2N98, Li2SiO2N99, Li2SiO2N100). This composite structure provides both protective function and high lithium ion conductivity, eliminating the trade-off between protection and resistance

Inventive Principle:

Principle #40Composite materials

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 solution enhances the stability and cycling lifetime of lithium ion batteries, enabling fast charging rates and maintaining cell performance by reducing resistance and preventing parasitic reactions.

Implementation Method 1

a coating of the initial anode, the coating comprising a layer of an ionic-conductive polymer that provides an artificial SEI (solid-electrolyte interphase) to facilitate lithium ion transfer therethrough

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS11916226B2Anode coating in lithium ion batteries

Publication Date: 2024.02.27 STOREDOT

AI summary

Anodes for lithium-ion batteries and methods for their production are provided. Anodes comprise an initial anode made of consolidated anode material particles, and a coating of the initial anode, that comprises a layer of an ionic-conductive polymer which provides an artificial SEI (solid-electrolyte interphase) to facilitate lithium ion transfer through the coating while preventing direct fluid communication with the anode material particles and electrolyte contact thereto. The coating may be configured to keep the anode resistance low while preventing electrolyte decomposition thereupon, enhancing cell stability and cycling lifetime.