Ni-Ti Lithium Composite Cathode for Si Anode Balance

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Solution Overview

Problem

Conventional lithium secondary batteries face challenges in achieving high charge capacity and balanced charge/discharge efficiency when using Si-based anode active materials, leading to inferior lifespan characteristics and reduced energy density due to the mismatch between cathode and anode active materials.

Innovation Solution

A novel lithium composite metal oxide containing nickel (Ni) and titanium (Ti) as main components is developed, which balances charge capacity, discharge capacity, and charge/discharge efficiency, optimizing performance when used with Si-based anode active materials by minimizing cation mixing and stabilizing the crystal structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If Si-based anode active material is used, then energy density is improved, but charge/discharge efficiency is reduced

Engineering Contradiction:
Improveenergy densityVSAvoidcharge/discharge efficiency
Core Design Contradiction:
Use of energy by moving objectVSProductivity

Solution Approach 1:

The invention changes the cathode material parameters to match the anode's charge/discharge efficiency characteristics, creating a balanced cell where both electrodes operate at optimal efficiency levels

Inventive Principle:
Principle #35Parameter changes

2Quantity of substance

If capacity is increased, then energy density is improved, but lifespan is reduced

Engineering Contradiction:
ImprovecapacityVSAvoidlifespan
Core Design Contradiction:
Quantity of substanceVSDuration of action of stationary object

Solution Approach 1:

The invention optimizes the compositional parameters of the cathode active material to achieve a balance between capacity and lifespan, preventing the degradation that occurs when capacity is increased through conventional means

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The invention replaces expensive and unstable elements (Co, Mn) with more stable and abundant elements (Ti), creating a material that maintains performance over longer periods

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS20220344658A1Novel lithium-metal oxide composite, and lithium secondary battery comprising same
Publication Date: 2022.10.27 L & F CO LTD

AI summary

Disclosed is a lithium composite metal oxide containing nickel (Ni) and titanium (Ti) as main components. The lithium composite metal oxide, which is a cathode active material for a lithium secondary battery, has high charge capacity and desirable lifespan characteristics, and realizes optimal performance of a lithium secondary battery when used in combination with an anode active material having high energy density. In particular, the lithium composite metal oxide is capable of maintaining optimal balance with the charge and discharge efficiency of the Si-based anode active material and thus enables manufacture of a high-performance lithium secondary battery.