Electrochemical apparatus and electronic apparatus

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Solution Overview

Problem

Lithium-ion batteries face issues with high internal resistance and heat dissipation, leading to prolonged charging times, potential safety hazards such as swelling and explosion, due to inadequate heat dissipation mechanisms.

Innovation Solution

An electrochemical apparatus with an electrode structure featuring a current collector, an intermediate layer with a specific area ratio to the active material layer, and an electrolyte containing a sulfur-oxygen double bond-containing compound, which reduces direct current internal resistance and enhances safety by improving heat management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If lithium-ion battery charging and discharging rate is increased, then power output is improved, but internal resistance increases causing excessive heat generation

Engineering Contradiction:

Improvepower outputVSAvoidheat generation

Core Design Contradiction:

PowerVSTemperature

Solution Approach 1:

The patent modifies the chemical composition parameters of the electrolyte by introducing a sulfur-oxygen double bond-containing compound (such as vinylene carbonate or fluoroethylene carbonate) with specific molecular structure characteristics. This compound has a sulfur-oxygen double bond and specific functional groups that change the electrolyte's physical-chemical parameters, enabling it to form protective films on electrode surfaces that reduce internal resistance and improve heat dissipation efficiency during high-rate charging and discharging operations

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolyte system by combining the sulfur-oxygen double bond-containing compound with traditional lithium salt (LiPF6) and conventional carbonate solvents (EC, PC, DM). This composite electrolyte formulation synergistically combines the film-forming and resistance-reducing properties of the sulfur-containing compound with the ionic conductivity of traditional components, achieving both low internal resistance and effective heat management during high-power operation

Inventive Principle:

Principle #40Composite materials

2Productivity

If charging time is reduced through fast charging, then productivity is improved, but internal resistance increases leading to safety hazards

Engineering Contradiction:

Improvecharging speedVSAvoidsafety performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The sulfur-oxygen double bond-containing compound performs preliminary action by rapidly forming protective surface films on electrode particles during initial contact with the electrolyte. These pre-formed films serve as stable interfaces that prevent subsequent heat generation and safety issues during fast charging, enabling high-rate charging without compromising safety

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The sulfur-containing compound acts as an intermediary substance between the electrode and the bulk electrolyte. It forms interfacial protective layers that mediate the interaction between lithium ions and electrode surfaces, reducing internal resistance and preventing harmful side reactions that would otherwise occur during fast charging, thus ensuring safety while enabling high productivity

Inventive Principle:

Principle #24Intermediary (Mediator)

3Temperature

If heat dissipation is improved, then temperature control is enhanced, but internal resistance increases reducing battery performance

Engineering Contradiction:

Improveheat dissipationVSAvoidbattery performance

Core Design Contradiction:

TemperatureVSPower

Solution Approach 1:

The patent changes the thermal and electrical parameters of the electrolyte system by incorporating the sulfur-oxygen double bond-containing compound. This compound modifies the electrolyte's viscosity, ionic conductivity, and thermal conductivity parameters, creating a balanced system that achieves effective heat dissipation while maintaining low internal resistance and high power output capability

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 significantly decreases direct current internal resistance and thickness swelling rate, enhancing the safety and performance of lithium-ion batteries by stabilizing the electrode structure and improving heat dissipation.

Implementation Method 1

the electrolyte includes a sulfur-oxygen double bond-containing compound

Methodology Applied

Scientific EffectElectrochemical reaction: Redox Reactions

Data Source

PatentUS20230275273A1Electrochemical apparatus and electronic apparatus

Publication Date: 2023.08.31 NINGDE AMPEREX TECHNOLOGY LTD

AI summary

An electrochemical apparatus includes an electrode and an electrolyte. The electrode includes a current collector, an intermediate layer disposed on the current collector, and an active material layer disposed on the intermediate layer. The intermediate layer has a specific area ratio to the active material layer. The electrolyte includes a sulfur-oxygen double bond-containing compound. The electrochemical apparatus has improved direct current internal resistance and safety performance.