Trigonal Cathode Additive for Low-Gas Lithium Supplementation

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Solution Overview

Problem

Existing irreversible additives in lithium secondary batteries cause impurity and gas generation due to structural changes during operation, leading to reduced energy density and stability issues.

Innovation Solution

A trigonal crystal structured lithium nickel molybdenum oxide (Li2Ni1-bMobO2) is used as an irreversible additive, with Mo doping to stabilize the structure and minimize impurity and gas generation, maintaining structural stability during voltage changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If Li2NiO2 with orthorhombic crystal structure is used as irreversible additive, then lithium ions are supplemented at initial charge, but structural changes occur during operation causing impurity and gas generation

Engineering Contradiction:

Improvelithium ion supplementationVSAvoidimpurity and gas generation

Core Design Contradiction:

Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

The patent changes the crystal structure parameter from orthorhombic to trigonal system, and modifies the chemical composition by doping with Mo elements. This parameter change stabilizes the additive structure during voltage changes, preventing the three-stage structural transformations that previously caused impurity and gas generation while maintaining lithium ion supplementation capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material by doping Mo elements into the Li2NiO2 structure, forming Li2Ni1-bMobO2. This composite approach enhances structural stability and prevents decomposition reactions that generate impurities and gases, while preserving the irreversible lithium ion supplementation function

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If irreversible additive undergoes three stages of structural changes in operating voltage range, then lithium ions are de-intercalated, but crystal structure stability deteriorates

Engineering Contradiction:

Improvelithium ion de-intercalationVSAvoidcrystal structure stability

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

The patent modifies the crystal structure parameter from orthorhombic to trigonal system and adjusts composition through Mo doping. This parameter change enables the structure to maintain stability during lithium ion de-intercalation in the 3.0-4.25V range, eliminating the three-stage structural transformations and their associated stability deterioration

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 additive enhances lithium ion delivery while reducing impurity and gas formation, improving battery performance and lifespan by maintaining stable crystal structures during operation.

Implementation Method 1

Methodology Applied

Scientific EffectCrystal structure stability:

Implementation Method 2

The additive enhances lithium ion delivery while reducing impurity and gas formation, improving battery performance and lifespan by maintaining stable crystal structures during operation.

Methodology Applied

Scientific EffectLithium ion delivery:

Data Source

PatentUS12418028B2Irreversible additive comprised in cathode material for secondary battery, cathode material comprising the same, and secondary battery comprising cathode material

Publication Date: 2025.09.16 LG ENERGY SOLUTION LTD

AI summary

The present disclosure provides an irreversible additive contained in a cathode material for a secondary battery, wherein the irreversible additive is an oxide represented by the following chemical Formula 1, and wherein the oxide has a trigonal structure, a cathode material including the irreversible additive, and a secondary battery including the cathode material:Li2+aNi1-bMObO2+c (1)in Formula 1, −0.25≤a≤0.2, 0<b≤0.2, 0≤c≤0.2.