Method for producing boron lithium oxalic acid

A technology of boron oxalate and oxalic acid, which is applied in the field of lithium-ion batteries, can solve the problems of secondary pollution during storage time, complicated purification methods, and reduced production capacity, and achieve the effects of convenient operation and control, simple process, and low production cost

Inactive Publication Date: 2008-05-07
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Since LiBOB will cause secondary pollution during the purification process due to the impurity of the solvent or the long time in the air, etc., the above-mentioned various purification meth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Embodiment 1,

[0040] 1. Add 70.0 g of raw material oxalic acid dihydrate into 250 g of distilled water, heat to 55±5°C under stirring to dissolve completely, and obtain oxalic acid solution.

[0041] 2. Add raw material lithium hydroxide 11.74G to the above solution, heat to 75±5°C under stirring to dissolve and complete the reaction, and generate a lithium oxalate solution, which is filtered to remove impurities and set aside for later use.

[0042] 3. In the lithium oxalate solution, add 17.11G boric acid as raw material, heat to 85±5°C under stirring to dissolve and complete the reaction, and generate a lithium oxalate borate solution, which is filtered to remove impurities and set aside for later use.

[0043] 4. Evaporate the solution in step 3 under the condition of stirring and controlling the temperature at 90-110° C. to obtain lithium boron oxalate crystal slurry.

[0044] 5. Put the obtained crystallization slurry of lithium boron oxalate into special equip...

Example Embodiment

[0046] Embodiment 2,

[0047] 1. Add 70.0 g of oxalic acid dihydrate as a raw material into 250 g of distilled water, and heat to 55±5° C. under stirring to complete the dissolution to obtain an oxalic acid solution.

[0048] 2. Add raw material lithium hydroxide 11G to the above solution, heat to 75±5°C under stirring to dissolve and complete the reaction, and generate a lithium oxalate solution, which is filtered to remove impurities and set aside for later use.

[0049] 3. In the lithium oxalate solution, add 17G boric acid as the raw material, and heat to 85±5°C under stirring to dissolve and complete the reaction to form a lithium oxalate borate solution, which is filtered to remove impurities and set aside for later use.

[0050] 4. Evaporate the solution in step 3 under the condition of stirring and controlling the temperature at 90-110° C. to obtain 125 g of lithium boron oxalate crystal slurry.

[0051] 5. The obtained crystallization slurry of lithium boron oxalate wa...

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Abstract

The invention relates to a method for preparing oxalic acid rhodizite which is used as the electrolyte salt in a lithium ion battery. The method adopts oxalate dehydrate (H2C2O4, 2H2 or anhydrous oxalate, lithium hydroxide (LiOH) or lithium carbonate ( Li2CO3), boric acid (H3BO3) or diboron trioxide (B2O3) as the raw material to produce high-purity oxalic acid rhodizite. Moreover, the invention has the technical process including raw material purifying, reacting, vaporizing and crystallizing, mixing and vacuum drying so as to acquire the battery-class LiBOB product with the purity of more than 99.5 percent.

Description

Technical field: [0001] The invention relates to lithium ion battery technology, which is a preparation method of lithium boron oxalate. The lithium boron oxalate is mainly used as an electrolyte salt for lithium ion batteries, especially for power lithium ion batteries requiring good safety. Background technique: [0002] Lithium-ion battery is a new type of battery that developed rapidly in the field of rechargeable batteries in the late 1990s. Due to its excellent performance, it currently occupies almost the entire market of batteries for small electronic tools such as mobile phones and video cameras. The continuous development and progress of battery materials has gradually expanded the application of lithium-ion batteries to the fields of aviation, navigation, military and electric vehicles. [0003] Lithium salts used in lithium-ion batteries are generally lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, and lithium salts of organic...

Claims

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Application Information

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IPC IPC(8): C07C55/07C07C51/41
Inventor 郭西凤赵庆云宁延生
Owner CHINA NAT OFFSHORE OIL CORP
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