Lithium Titanate Anode Marker for SOC Potential Step
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lithium-ion battery systems face challenges in accurately determining the state of charge (SOC) due to flat potential versus SOC relationships, which hinders the precision of SOC estimators and requires improved methods for observable changes in potential measurements.
Innovation Solution
Incorporating a material additive, such as lithium titanate, into the anode of lithium-ion battery cells to create a significant change in potential measurements at selected SOC levels, resulting in a step change that enhances the accuracy of SOC estimation by introducing a non-flat potential versus SOC relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrode materials are used, then the battery structure is simple, but the potential versus SOC relationship is flat making SOC determination inaccurate
Solution Approach 1:
A marker material is introduced as an intermediary component in the electrode to mediate between the conventional electrode structure and the SOC measurement system. This marker material provides distinct potential signatures at specific SOC levels, enabling accurate SOC determination without fundamentally altering the overall electrode architecture or performance characteristics.
Solution Approach 2:
The invention changes the electrical potential parameter of the electrode by incorporating marker materials with specific potential characteristics. These marker materials create distinct potential plateaus or inflection points at predetermined SOC levels, transforming the flat potential-SOC relationship into one with measurable features for accurate SOC estimation.
2Measurement precision
If marker material is added to create observable potential changes, then SOC estimation accuracy improves, but electrode manufacturing complexity increases
Solution Approach 1:
The marker material is applied locally to specific regions or layers within the electrode structure rather than uniformly throughout. This localized application maintains the bulk electrode's manufacturing characteristics while introducing SOC-indicating features only where needed, minimizing impact on manufacturing processes.
Solution Approach 2:
The electrode is designed as a composite structure combining conventional active materials with marker materials having complementary properties. This composite approach allows the electrode to maintain its electrochemical performance while incorporating the SOC-marking functionality, and the marker materials can be selected to be compatible with existing manufacturing techniques.
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 use of lithium titanate as an SOC marker in the anode leads to improved accuracy in state of charge estimation by inducing a readily observable change in potential, thereby enhancing the precision of SOC determination and energy content assessment in lithium-ion battery systems.
Implementation Method 1
the second material becomes active to transfer ions at a selected SOC level to result in a readily observable change in measured potential
Data Source
AI summary
One embodiment includes a battery cell electrode having a first material constructed and arranged to be charged and discharged and having a first potential versus state of charge relationship; a second material having a second potential versus state of charge relationship; wherein said second material is constructed and arranged to become active to transfer ions at a selected state of charge level to produce an observable change in measured potential from said first to said second potential versus relationship, and wherein the amount of the second material ranges from about 2 to about 30 weight percent of the battery cell electrode.