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Solid-phase production method of lithium-borate-base electrolyte

A production method and technology of lithium borate, applied in the chemical field, can solve the problems of incomplete reaction, low product yield, affecting product purity, etc., and achieve the effects of low labor intensity of workers, high product purity, and easy operation.

Active Publication Date: 2016-07-06
CHAOYANG GUANGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the reaction is not complete, and impurities such as by-products are easily produced, the product yield is low, and the purity of the product is affected (purity is generally less than 99%)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 produces dioxalate lithium borate

[0029] In a 300-liter horizontal double-shaft forward and reverse vacuum stainless steel kneader, add 18.7 kg of anhydrous lithium hydroxide, add 48.3 kg of anhydrous boric acid, add 141 kg of anhydrous oxalic acid, replace the air of the kneader in a vacuum state, and start the main motor. After stirring and turning, heat to 80°C, control the pressure gauge at about -0.02MPa, and pre-synthesize for 2 hours; then raise the temperature to 150°C, control the pressure gauge at about -0.08MPa, and keep warm for 3 hours; then raise the temperature to 240°C , the pressure gauge is controlled at about -0.08MPa, and the drying and dehydration is completed for 7 hours to complete all the reaction steps.

[0030] Lithium dioxalate borate product yield 97.73%, analysis product purity: 99.53%

Embodiment 2

[0031] Embodiment 2 produces polymer lithium borate tartrate

[0032]In a 300-liter horizontal double-shaft forward and reverse vacuum stainless steel kneader, add 22.2 kg of anhydrous lithium hydroxide, add 43 kg of anhydrous boric acid, add 139.4 kg of anhydrous tartaric acid, replace the air of the kneader in a vacuum state, start the main motor, After stirring and rotating, heat to 90°C, and the pressure gauge is controlled at -0.02MPa, and the pre-synthesis reaction is 3 hours; then the temperature is raised to 150°C, the pressure gauge is controlled at about -0.08MPa, and the synthesis reaction is kept for 3 hours; then the temperature is raised to 240°C, The pressure gauge is controlled at about -0.08MPa, and all the reaction steps are completed by drying and dehydrating for 6 hours.

[0033] The yield of polymer lithium borate tartrate is 98.72%, and the purity of the analyzed product is 99.38%.

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Abstract

The invention discloses a solid-phase production method of a lithium-borate-base electrolyte. The method comprises the following steps: by using a solid boron-containing compound, a solid lithium-containing compound and a solid organic carboxylic acid as raw materials and a vacuum stainless steel kneader as a reactor, stirring and heating the raw materials under micro-positive or negative pressure to perform pre-synthesis reaction, and keeping the temperature to perform synthesis reaction; and in the vacuum state, keeping the temperature for drying and dewatering, thereby finishing the production steps. The method has the advantages of simple control in production operation and high conversion rate, solves the problems of high complexity and low efficiency in other multistep solid-phase reaction processes, can produce multiple solid lithium-borate-base electrolytes, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a solid-phase production method of lithium borate-based electrolyte, belonging to the technical field of chemical industry. Background technique [0002] Since the advent of lithium-ion batteries in the 1990s, they have attracted much attention due to their advantages such as high energy density and long cycle life, and have played an important role in various fields. Electrolyte lithium salt is an important part of lithium-ion secondary batteries. Among them, LiPF6 is used in lithium batteries and has been commercialized, but LiPF6 still has some disadvantages, such as: poor thermal stability, easy to decompose into LiF and PF5 , while PF5 is easily hydrolyzed to form HF and PF3O, which has a harmful effect on the performance of the battery. Therefore, it is very important to study new electrolyte lithium salts. Among many new lithium salts, LiBOB has shown its unique advantages, has attracted widespread attention, and is ex...

Claims

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Application Information

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IPC IPC(8): C07F5/02H01M10/056H01M10/058
CPCC07F5/022H01M10/056H01M10/058Y02E60/10Y02P70/50
Inventor 李绍通
Owner CHAOYANG GUANGDA CHEM
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