Titanium Boride Additive for High-Voltage Lithium Nickel Battery Stability
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Solution Overview
Problem
Non-aqueous secondary batteries, particularly those with lithium nickel complex oxide as a positive electrode active material, face challenges in maintaining superior charge-discharge characteristics, high-temperature storage, and cycle performance when charged with high voltages, leading to deterioration in battery performance.
Innovation Solution
A method involving heat-treating titanium boride particles in an oxygen-containing atmosphere to form heat-treated particles, which are then mixed with lithium transition metal complex oxide particles containing nickel, at specific ratios to create a positive electrode composition that enhances the battery's charge-discharge, high-temperature storage, and cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium nickel complex oxide is used as positive electrode active material to increase capacity, then capacity per unit mass is improved, but charge-discharge characteristics and cycle performance deteriorate when charged with high voltage
Solution Approach 1:
The patent uses a composite material system consisting of lithium nickel complex oxide particles combined with titanium boride particles (heat-treated at 150-300°C) and carbon-coated particles. This composite structure allows the battery to achieve high capacity from the lithium nickel complex oxide while the titanium boride and carbon coating protect against degradation during high-voltage charging, thus maintaining both high capacity and good charge-discharge characteristics.
Solution Approach 2:
The patent introduces titanium boride particles (heat-treated at 150-300°C) as an intermediary substance between the lithium nickel complex oxide and the electrolyte. This intermediary layer facilitates ion transport while protecting the lithium nickel complex oxide from direct contact with the electrolyte, preventing degradation and maintaining cycle performance even at high charging voltages.
2Quantity of substance
If lithium nickel complex oxide is used as positive electrode active material, then capacity per unit mass is improved, but high-temperature storage characteristics deteriorate
Solution Approach 1:
The patent creates a composite structure where lithium nickel complex oxide particles are combined with heat-treated titanium boride particles (150-300°C) and carbon-coated particles. This composite material provides thermal stability at high temperatures while maintaining the high capacity characteristics of the lithium nickel complex oxide, thus improving high-temperature storage characteristics without sacrificing capacity.
Solution Approach 2:
The patent applies a protective coating of carbon and heat-treated titanium boride on the lithium nickel complex oxide particles before battery assembly. This pre-applied protective layer acts as a cushion against thermal degradation and chemical reactions at high temperatures, preserving both capacity and storage characteristics under elevated temperature conditions.
3Use of energy by moving object
If lithium nickel complex oxide is charged with high voltage, then energy density is improved, but cycle characteristics deteriorate
Solution Approach 1:
The patent introduces heat-treated titanium boride particles (150-300°C) and carbon-coated particles as intermediary protective layers that enable high-voltage charging. These intermediaries allow the battery to operate at high voltages (achieving high energy density) while protecting the lithium nickel complex oxide from electrochemical degradation, thus maintaining good cycle characteristics over extended use.
Solution Approach 2:
The patent employs a composite material system where lithium nickel complex oxide is combined with heat-treated titanium boride (150-300°C) and carbon coating. This composite structure enables the battery to achieve high energy density through high-voltage charging while the titanium boride and carbon components protect against structural degradation, preserving cycle characteristics even under high-voltage operation conditions.
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 resulting non-aqueous secondary battery exhibits improved charge-discharge efficiency, high-temperature storage, and cycle performance when charged with high voltages, making it suitable for large devices like electric vehicles.
Implementation Method 1
heat-treating titanium boride particles at a temperature ranging from 150° C. to 300° C. under an oxygen-containing atmosphere to obtain heat-treated particles
Data Source
AI summary
A positive electrode composition for a non-aqueous secondary battery, including: titanium boride particles; and a positive electrode active material comprising lithium transition metal complex oxide particles that comprise nickel in a composition and have a layered structure. The titanium boride particles comprise an oxygen component in a content of greater than or equal to 1.5 wt % and less than or equal to 2.9 wt %. A content of the titanium boride particles relative to the lithium transition metal complex oxide particles is less than or equal to 1.5 mol % in titanium equivalent terms.