Method for preparing nano-scale lithium carbonate for battery

A nano-scale, lithium carbonate technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problem that lithium carbonate cannot be used in battery electrolyte, etc., and achieve the effect of improving battery capacity and low-temperature discharge performance

Inactive Publication Date: 2010-03-24
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is in order to overcome the shortcoming that the lithium carbonate that existing lithium carbonate preparation method makes can not be used in battery electrolyte, provides a kind of preparation method that can prepare the lithium carbonate suitable for use in battery electrolyte

Method used

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  • Method for preparing nano-scale lithium carbonate for battery
  • Method for preparing nano-scale lithium carbonate for battery
  • Method for preparing nano-scale lithium carbonate for battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This example is used to illustrate the preparation method of nanoscale lithium carbonate for batteries provided by the present invention.

[0027] Accurately weigh 23.94 grams of analytically pure lithium hydroxide and 0.18 grams of γ-butyrolactone and dissolve them in 250 ml of deionized water to obtain a clear solution. The solution was heated to 65°C, and carbon dioxide gas in a cylinder with a pressure of 6.5 atmospheres was continuously fed into the solution at a rate of 0.05 liters / min. After 22 hours, carbon dioxide gas was stopped. The final pH value of the solution is 9. The reaction system was cooled to room temperature and settled for 24 hours, and then filtered with a sand core funnel. The obtained solid was washed three times with 45°C warm water, and then the solid product was baked in a 120°C oven for 48 hours to obtain a white powder. Lithium carbonate product S1.

Embodiment 2

[0032] This example is used to illustrate the preparation method of nanoscale lithium carbonate for batteries provided by the present invention.

[0033] Accurately weigh 42.39 grams of analytically pure lithium chloride and 1.23 grams of tributylamine and dissolve them in 400 ml of deionized water to obtain a clear solution. The solution was heated to 65°C, and carbon dioxide gas in a cylinder with a pressure of 6.5 atmospheres was continuously fed into the solution at a rate of 0.05 liters / min. After 22 hours, carbon dioxide gas was stopped. The final pH value of the solution is 9. The reaction system was cooled to room temperature and settled for 24 hours, and then filtered with a sand core funnel. The obtained solid was washed three times with 45°C warm water, and then the solid product was baked in a 120°C oven for 48 hours to obtain a white powder. Lithium carbonate product S2.

Embodiment 3

[0035] This example is used to illustrate the preparation method of nanoscale lithium carbonate for batteries provided by the present invention.

[0036] Accurately weigh 68.94 grams of analytically pure lithium nitrate and 0.49 grams of tributylamine and dissolve them in 250 ml of deionized water to obtain a clear solution. The solution was heated to 75°C, and carbon dioxide gas in a cylinder with a pressure of 6.5 atmospheres was continuously fed into the solution at a rate of 0.05 liters / min. After 22 hours, carbon dioxide gas was stopped. The final pH value of the solution is 9. The reaction system was cooled to room temperature and settled for 24 hours, then filtered with a sand core funnel, and the obtained solid was washed three times with 55°C warm water, and then the solid product was placed in a 120°C oven for 48 hours to obtain a white powder. Lithium carbonate product S3.

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Abstract

The invention relates to a method for preparing nano-scale lithium carbonate which is used for a battery. The method comprises the following steps: lithium ion and carbonate ion are contacted and react in water solution, wherein, the contact reaction is carried out in the presence of dispersant, which is anionic surface active agent which contains carboxylate group and/or sulfonate unit and/or organic amine. The lithium carbonate which is prepared by the method provided by the invention has very small grain size, and grain diameter of D10 can be as small as below 80 nanometer, and the final lithium carbonate product only contains minim impurity that does not bring adverse effect to the performance of the battery, thus fully meeting the requirement of battery electrolyte to the grain size and the purity of the lithium carbonate and being suitable for being used in battery electrolyte. When used in the battery electrolyte, the lithium carbonate prepared by the invention does not bring any adverse effect to the battery performance, on the contrary, the lithium carbonate can improve various performances of the battery, such as overcharging resistance, discharge performance at low temperature and battery capacity.

Description

technical field [0001] The present invention relates to a preparation method of lithium carbonate, in particular to a preparation method of nanoscale lithium carbonate for batteries. Background technique [0002] Lithium carbonate is widely used in industrial production, and is usually used as a basic raw material for obtaining metallic lithium and its isotopes and various fine lithium salts, special glasses, ceramics and enamels, electronic components and photochemical devices, and also used in medical treatment. diseases such as depression. Recently, it has been found that adding lithium carbonate as an additive to the electrolyte can improve the film-forming performance of the battery, thereby improving the cycle performance and low-temperature discharge performance of the battery. [0003] The method of adding lithium carbonate to the electrolyte to improve battery performance requires lithium carbonate to meet at least two requirements: 1. lithium carbonate must have a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08
Inventor 杜楠周贵树
Owner BYD CO LTD
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