Modified diatomite additive for electrolyte for lithium battery and preparation method

A diatomaceous earth and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as flatulence, achieve the effects of improving viscosity stability, reducing flatulence, and improving low-temperature performance

Inactive Publication Date: 2018-10-16
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problem of flatulence caused by the decomposition of lithium salt in the electrolyte during the working process of lithium batteries that are currently widely used, and the performance of the electrolyte at low

Method used

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  • Modified diatomite additive for electrolyte for lithium battery and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation process is:

[0034] (1) The starch ether solution was prepared by etherified starch and deionized water; the etherified starch was hydroxyalkyl starch; the mass concentration of the starch ether solution was 4%;

[0035] (2) Use sodium hydroxide to adjust the starch ether solution to strong alkalinity; the pH of the starch ether solution is 11;

[0036] (3) Add fatty acid and diatomite powder to the starch ether solution, heat and cook for 110 minutes; the ratio of raw materials is 70 parts by weight of starch ether solution, 7 parts by weight of fatty acid, and 23 parts by weight of diatomite powder; the cooking temperature is 93°C ;

[0037] (4) Use dilute hydrochloric acid to adjust the system to strong acidity; the pH of the system is 2;

[0038] (5) Filter and wash with deionized water until neutral;

[0039] (6) Vacuum drying and dehydration to prepare the electrolyte modified diatomite additive for lithium batteries; the temperature of vacuum ...

Embodiment 2

[0041] The preparation process is:

[0042] (1) The starch ether solution is prepared by etherified starch and deionized water; the etherified starch is carboxymethyl starch; the mass concentration of the starch ether solution is 3%;

[0043] (2) Use sodium hydroxide to adjust the starch ether solution to strong alkalinity; the pH of the starch ether solution is 11;

[0044] (3) Add fatty acid and diatomite powder to the starch ether solution, heat and cook for 95 minutes; the ratio of raw materials is 71 parts by weight of starch ether solution, 7 parts by weight of fatty acid, and 22 parts by weight of diatomite powder; the cooking temperature is 91°C ;

[0045](4) Use dilute hydrochloric acid to adjust the system to strong acidity; the pH of the system is 2;

[0046] (5) Filter and wash with deionized water until neutral;

[0047] (6) Vacuum drying and dehydration to prepare the electrolyte modified diatomite additive for lithium batteries; the temperature of vacuum dryi...

Embodiment 3

[0049] The preparation process is:

[0050] (1) The starch ether solution was prepared by etherified starch and deionized water; the etherified starch was cationic starch; the mass concentration of the starch ether solution was 4.6%;

[0051] (2) Use sodium hydroxide to adjust the starch ether solution to strong alkalinity; the pH of the starch ether solution is 11;

[0052] (3) Add fatty acid and diatomite powder to the starch ether solution, heat and cook for 140 minutes; the ratio of raw materials is 63 parts by weight of starch ether solution, 9 parts by weight of fatty acid, and 28 parts by weight of diatomite powder; the cooking temperature is 95°C ;

[0053] (4) Use dilute hydrochloric acid to adjust the system to strong acidity; the pH of the system is 2;

[0054] (5) Filter and wash with deionized water until neutral;

[0055] (6) Vacuum drying and dehydration to prepare the electrolyte modified diatomite additive for lithium batteries; the temperature of vacuum dr...

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Abstract

The invention provides a modified diatomite additive for an electrolyte for a lithium battery and a preparation method. The method comprises the steps of firstly preparing a starch ether solution andadjusting the starch ether solution to strong alkalinity by using sodium hydroxide; adding fatty acid and diatomite powder to the starch ether solution, carrying out heating and stewing and adjustinga system to strong acidity by using diluted hydrochloric acid; and filtering, washing a product to neutrality by using deionized water and carrying out vacuum drying dehydration to obtain the modifieddiatomite additive for the electrolyte for the lithium battery. According to the method, decomposition of hexafluorophosphate is inhibited in a lithium ion dissociation process through filling diatomite with starch ether and absorbing the hydrogen fluoride and trace water by the diatomite, gas expansion of the lithium battery is effectively reduced and the viscosity stability of the electrolyte for the lithium battery at low temperature can be improved, thereby improving the low temperature performance of the lithium battery.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to the preparation of electrolyte additives, in particular to an electrolyte modified diatomite additive for lithium batteries and a preparation method thereof. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainstream now. The positive electrode material, negative electrode material and electrolyte are the three major elements that make up a lithium-ion battery. Among them, the electrolyte is composed of organic solvent, electrolyte lithium salt ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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