Organic Lithium Salt Synthesis for High Li-Ion Purity

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Solution Overview

Problem

Organic lithium salts often contain impurities such as cations other than lithium ions, which can hinder the performance of applications like lithium ion batteries where lithium ion mobility is crucial.

Innovation Solution

A method for producing organic lithium salts with a low content of cations other than lithium ions by reacting specific compounds in the presence of lithium salts, using lithium-containing bases and solvents like acetic anhydride, to create compositions with a high lithium ion concentration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional methods are used to produce organic lithium salts, then production is simpler and faster, but the content of cations other than lithium ions increases

Engineering Contradiction:

Improvepurity of lithium ionsVSAvoidcomplexity of production process

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The production process is divided into multiple sequential steps: Step 1 involves reacting compound (D) with compound (E1) in the presence of at least two types of lithium salts to produce compound (A1); Step 2 involves reacting compound (A1) with compound (B1) to produce the final organic lithium salt compound (A). This segmentation allows for controlled introduction and removal of different cations, enabling high purity lithium ion content while managing process complexity systematically

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Compound (A1) serves as an intermediary substance that temporarily contains both lithium ions and other cations during synthesis. This intermediary compound allows the process to introduce cations in a controlled manner, then selectively remove non-lithium cations in subsequent steps, achieving high purity without requiring a single-step complex purification process

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If organic lithium salts with high lithium ion concentration are produced, then lithium ion transference number improves, but production complexity increases

Engineering Contradiction:

Improvelithium ion transference numberVSAvoidcomplexity of production process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The process controls the concentration parameters of lithium salts and other cations at different stages. By adjusting the ratios and amounts of lithium salts introduced in Step 1, and controlling the reaction conditions, the method achieves optimal lithium ion concentration in the final product, thereby improving lithium ion transference number while managing production complexity through parameter optimization

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If multiple lithium salts are used in the reaction, then lithium ion concentration increases, but purification becomes more difficult

Engineering Contradiction:

Improveconcentration of lithium ionsVSAvoidease of purification

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The method performs preliminary actions by introducing multiple lithium salts in a controlled sequence during Step 1, rather than attempting to purify a mixture afterward. The process pre-establishes the desired lithium ion concentration through controlled introduction, then uses Step 2 to selectively remove non-lithium cations, making purification easier by addressing it at a specific stage rather than dealing with a complex mixture throughout

Inventive Principle:

Principle #10Preliminary action

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 method results in organic lithium salts with improved lithium ion transference numbers, enhancing the performance of lithium ion batteries.

Implementation Method 1

reacting a compound (D) represented by the following formula (D) with a compound (E1) represented by the following formula (E1) in the presence of at least two types of lithium salts

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Implementation Method 2

reacting a compound (C) represented by the following formula (C) in a solvent in the presence of a lithium-containing base

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Data Source

PatentEP4707309A1Method for producing organic lithium salt, composition containing said organic lithium salt, and polymer

Publication Date: 2026.03.11 SUMITOMO CHEM CO LTD

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AI summary

The present disclosure provides a method for producing a compound (A1) represented by the following formula (A1), the method including a step of reacting a compound (D) represented by the following formula (D) with a compound (E1) represented by the following formula (E1) in the presence of at least two types of lithium salts. (In formula (A1), R1 is a hydrogen atom or a monovalent substituent, R3 is a hydrogen atom or a monovalent substituent, Y is a halogen atom or a monovalent organic group having 1 to 20 carbon atoms, and X and R2 satisfy the following (1) or (2): (1) X is a divalent organic group having 1 to 20 carbon atoms, and R2 is a monovalent organic group. (2) R2 and X are taken together to form a trivalent group.)