LFP Electrode Material Spheniscidite Precursor Low-Temperature Performance

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Solution Overview

Problem

Current lithium iron phosphate (LFP) materials for lithium-ion batteries have limitations in extreme temperature environments, such as low energy storage at temperatures below 0°C, and exhibit issues with impedance, power during cold cranking, high rate capacity retention, and charge transfer resistance, making them unsuitable for a broader range of applications.

Innovation Solution

A high-purity ammonium iron phosphate precursor, spheniscidite, is synthesized to produce lithium iron phosphate (LFP) with specific characteristics, including a plate-shaped morphology, controlled impurity levels, and a high surface area, which improves the electrochemical properties of LFP materials, enhancing their performance in extreme temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional LFP materials are used, then manufacturing simplicity is maintained, but performance in extreme temperature environments deteriorates

Engineering Contradiction:

Improveperformance in extreme temperature environmentsVSAvoidenergy storage capability below 0°C

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent modifies the physical and chemical parameters of LFP materials by controlling particle size (reducing to nanoscale), increasing surface area, and adjusting morphology to enhance low-temperature ionic conductivity and electrochemical performance, thereby improving energy storage capability below 0°C

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material strategies by combining LFP with conductive additives, carbon coatings, or surface-modified structures to improve overall performance in extreme temperature conditions while maintaining the core LFP material's stability and safety

Inventive Principle:

Principle #40Composite materials

2Reliability

If LFP materials with high purity are synthesized, then impedance and charge transfer resistance are reduced, but manufacturing complexity increases

Engineering Contradiction:

Improveimpedance and charge transfer resistanceVSAvoidsynthesis process complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs preliminary purification steps and controlled synthesis conditions during the manufacturing process to preemptively remove impurities and prevent formation of unwanted phases, thereby reducing final product impedance and charge transfer resistance without requiring excessive post-processing

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent utilizes hydrothermal synthesis methods involving controlled aqueous environments, pressure, and temperature to facilitate pure phase formation and high-purity LFP material synthesis, achieving low impedance products through optimized hydraulic and thermal conditions

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Power

If LFP materials are optimized for high power, then cold cranking performance improves, but capacity retention at high rates deteriorates

Engineering Contradiction:

Improvecold cranking powerVSAvoidcapacity retention at high rates

Core Design Contradiction:

PowerVSProductivity

Solution Approach 1:

The patent divides LFP material into smaller particles or nanostructures, increasing the surface-area-to-volume ratio to enhance ionic transport kinetics and electron conductivity, thereby simultaneously improving cold cranking power and maintaining capacity retention at high discharge rates

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies surface modification or coating techniques to specific regions of LFP particles, enhancing local conductivity and reaction kinetics at the surface while preserving the bulk material's structural stability, thus improving both power output and rate capability

Inventive Principle:

Principle #3Local quality

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 LFP material synthesized from spheniscidite exhibits improved capacity at low temperatures, increased power during cold cranking, enhanced high rate capacity retention, and reduced charge transfer resistance, making it suitable for a wider range of applications, including those in extreme temperature conditions.

Implementation Method 1

During charge the anode intercalates lithium ions from the cathode and during discharge releases the ions back to the cathode

Methodology Applied

Scientific EffectIntercalation:

Implementation Method 2

Lithium-ion (Li-ion) batteries are a type of rechargeable battery which produce energy from electrochemical reactions

Methodology Applied

Scientific EffectElectrochemical reactions:

Implementation Method 3

an ionic electrolyte solution that supports the movement of ions back and forth between the two electrodes

Methodology Applied

Scientific EffectIon movement:

Implementation Method 4

reduced charge transfer resistance

Methodology Applied

Scientific EffectCharge transfer:

Data Source

PatentUS20230253561A1High power electrode materials

Publication Date: 2023.08.10 A123 SYSTEMS LLC

AI summary

An LFP electrode material is provided which has improved impedance, power during cold cranking, rate capacity retention, charge transfer resistance over the current LFP based cathode materials. The electrode material comprises crystalline primary particles and secondary particles, where the primary particle is formed from a plate-shaped single-phase spheniscidite precursor and a lithium source. The LFP includes an LFP phase behavior where the LFP phase behavior includes an extended solid-solution range.