Lithium-ion secondary battery and electric apparatus

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Solution Overview

Problem

Existing lithium-ion secondary batteries face challenges with high direct current resistance and metal dendrite formation, which affect power performance and cycling performance.

Innovation Solution

Incorporating alkali metal ions with a larger ionic radius than lithium ions and a film-forming additive into the electrolyte, along with specific mass percentage ratios, to form favorable lithium-ion transport channels and a uniform inorganic SEI film, thereby reducing direct current resistance and suppressing metal dendrites.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If conventional electrolyte composition is used, then battery structure is simple, but direct current resistance is high and power performance is poor

Engineering Contradiction:

Improvepower performanceVSAvoiddirect current resistance

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the electrolyte by introducing alkali metal ions (Na+, K+, Cs+) with larger ionic radii than lithium ions, and controls their mass percentage within 1-7000 ppm. This parameter change creates favorable channels for lithium-ion transport, reducing direct current resistance and improving power performance without compromising reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolyte system by combining traditional lithium salts with alkali metal salts and film-forming additives. This composite approach allows the electrolyte to simultaneously provide ionic conductivity, dendrite suppression, and stable SEI formation, resolving the contradiction between power performance and reliability

Inventive Principle:

Principle #40Composite materials

2Power

If electrolyte composition is optimized for performance, then power performance improves, but manufacturing complexity increases

Engineering Contradiction:

Improvepower performanceVSAvoidmanufacturing complexity

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent establishes specific parameter ranges for alkali metal ion concentration (1-7000 ppm) and film-forming additive ratios (0.10≤B/A≤6×104), making the manufacturing process controllable and reproducible. These defined parameters simplify quality control and manufacturing standardization despite the enhanced composition

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If film-forming additive is added to suppress dendrites, then safety improves, but direct current resistance increases

Engineering Contradiction:

Improvemetal dendritesVSAvoiddirect current resistance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies film-forming additives locally at the electrode-electrolyte interface to form protective SEI films, while maintaining the bulk electrolyte composition optimized for ionic conductivity. This localized approach suppresses dendrites at the interface without significantly increasing overall direct current resistance

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent precisely controls the mass percentage of film-forming additives and their ratio to alkali metal ions (0.10≤B/A≤6×104), optimizing the balance between dendrite suppression capability and ionic conductivity. This parameter optimization ensures safety improvement without excessive resistance increase

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 solution enhances power performance and cycling performance by improving lithium-ion transport and mitigating dendrite formation, resulting in improved safety and stability of the lithium-ion secondary battery.

Implementation Method 1

introducing alkali metal ions with a metal ionic radius greater than a radius of lithium ions into the electrolyte facilitates the formation of favorable channels for lithium-ion transport during charge/discharge of the lithium-ion secondary battery, thereby reducing the direct current resistance of the lithium-ion secondary battery

Methodology Applied

Scientific EffectIon transport: Diffusion

Implementation Method 2

introducing the film-forming additive into the electrolyte facilitates the formation of a uniform and dense inorganic SEI film at an interface between the negative electrode plate and the electrolyte can effectively suppress metal dendrites

Methodology Applied

Scientific EffectFilm formation: Deposition (physical)

Implementation Method 3

The inorganic SEI film is also capable of further inhibiting interfacial side reactions between the electrolyte and the negative electrode plate, improving the cycling performance of the lithium-ion secondary battery

Methodology Applied

Scientific EffectInhibition of side reactions:

Data Source

PatentUS20260074287A1Lithium-ion secondary battery and electric apparatus

Publication Date: 2026.03.12 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

AI summary

A lithium-ion secondary battery and an electric apparatus are provided. The lithium-ion secondary battery includes an electrolyte. The electrolyte includes alkali metal ions having an ionic radius greater than a radius of lithium ions and a film-forming additive. Based on a total mass of the electrolyte, a mass percentage A of the alkali metal ions and a mass percentage B of the additive satisfy 0.10≤B/A≤6×104.