Lithium Trifluoro(Nitrato) Borate Electrolyte Additive for Stable SEI

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Solution Overview

Problem

Existing lithium-ion secondary cell electrolytes lack additives that effectively enhance the stability of the solid electrolyte interphase (SEI) layer, leading to inadequate ionic conductivity, thermal stability, and cathode protection, which affects battery performance and lifespan.

Innovation Solution

A manufacturing process is developed to produce lithium trifluoro(nitrato) borate as an additive for lithium-ion secondary cells, involving the reaction of boron trifluoride complex with lithium nitrate to form a stable SEI film, improving cell performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolyte additives are used, then basic electrolyte function is maintained, but SEI layer stability and cathode protection are insufficient

Engineering Contradiction:

ImproveSEI layer stabilityVSAvoidcathode degradation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention introduces a novel electrolyte additive with specific molecular structure parameters (lithium nitrate complex with borate) that changes the chemical composition and properties of the SEI layer, enhancing its stability and protective function against cathode degradation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The additive combines lithium nitrate and borate in a complex structure, creating a composite chemical entity that provides multiple functions: SEI layer stabilization, ionic conductivity enhancement, and cathode protection simultaneously

Inventive Principle:

Principle #40Composite materials

2Reliability

If existing electrolyte formulations are used, then ionic conductivity is maintained at basic levels, but thermal stability is insufficient

Engineering Contradiction:

Improvethermal stabilityVSAvoidthermal degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The lithium nitrate-borate complex modifies the thermal properties of the electrolyte system by changing its chemical composition, raising the thermal stability threshold and resistance to thermal degradation

Inventive Principle:

Principle #35Parameter changes

3Duration of action of moving object

If standard electrolytes are used, then basic battery operation is achieved, but cycle performance deteriorates over time

Engineering Contradiction:

Improvebattery lifespanVSAvoidcycle performance

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The additive performs preliminary protective action by forming a stable SEI layer during initial cycles, which then protects the electrode interfaces throughout subsequent cycling, extending battery lifespan and maintaining cycle performance

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The SEI layer stabilized by the additive acts as a protective cushion between the electrolyte and electrode surfaces, preventing direct harmful interactions and cushioning against degradation during cycling

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 the specific capacity and retention of lithium-ion secondary cells, maintaining efficiency above 85% after 100 cycles, and improves performance at both room and high temperatures.

Implementation Method 1

adding boron trifluoride complex dropwise to a solution of lithium nitrate in methanol to form a first solution

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Implementation Method 2

removing volatile solvents in vacuo to obtain a first solid product

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 3

adding toluene to form a second solution, stirring the second solution overnight to obtain a white precipitate

Methodology Applied

Scientific EffectPrecipitation: Precipitation

Implementation Method 4

decanting solvents in the second solution, drying the white precipitate in vacuo to obtain lithium trifluoro(nitrato) borate

Methodology Applied

Scientific EffectVacuum drying: Vacuum Distillation

Data Source

PatentUS20260011779A1Manufacturing Process of Lithium Trifluoro (Nitrato) Borate as An Additive For Lithium-Ion Secondary Cells, An Electrolyte And Lithium-Ion Secondary Cells

Publication Date: 2026.01.08 GOTION INC

AI summary

Method of manufacturing lithium trifluoro(nitrato) borate as an additive for lithium-ion secondary cells, including, a) at room temperature, adding boron trifluoride complex dropwise to a solution of lithium nitrate in methanol to form a first solution, stirring the first solution overnight and removing volatile solvents in vacuo to obtain a first solid product; b) dissolving the first solid product in ester solvent, adding toluene to form a second solution, stirring the second solution overnight to obtain a white precipitate; c) decanting solvents in the second solution, drying the white precipitate in vacuo to obtain lithium trifluoro(nitrato) borate as the additive for lithium-ion secondary cells. Further disclosed is an electrolyte containing the above prepared lithium trifluoro(nitrato) borate and lithium-ion secondary cells using the electrolytes. The addition lithium trifluoro(nitrato) borate in the electrolytes may, for example, improve specific capacity of the cell and maintain an efficiency of over 85% after 100 cycles.