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A modified silicate aluminate additive for lithium sulfur battery electrolyte and a preparation method thereof

A technology of aluminosilicate and lithium-sulfur batteries, which is applied in the field of modified aluminosilicate additives and preparations of lithium-sulfur battery electrolytes, can solve problems such as difficulty in dissolving lithium polysulfide, achieve improved long-cycle performance, and have a simple method , the effect of stable structure and performance

Inactive Publication Date: 2019-01-08
CHENDU NEW KELI CHEM SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem that the existing lithium-sulfur battery electrolyte is difficult to effectively control the dissolution of lithium polysulfide, the present invention proposes a modified aluminosilicate additive for lithium-sulfur battery electrolyte and a preparation method thereof. The salt is made of mesoporous lithium-loaded aluminosilicate particles with a stable structure, which inhibits polysulfides from passing through the electrolyte through the separator, thereby keeping the negative electrode material from being corroded in complex working environments

Method used

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  • A modified silicate aluminate additive for lithium sulfur battery electrolyte and a preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] (1) Weigh 10 parts by mass of sodium metaaluminate, 9 parts by mass of sodium hydroxide, and 16 parts by mass of water glass solution with a mass concentration of 16%, add sodium metaaluminate and sodium hydroxide to the water glass solution and heat and stir , the stirring temperature is 75°C, the stirring speed is 60rpm, until the solution is completely clear, the clear solution is transferred to a polytetrafluoroethylene airtight container for aging, the aging pressure is 0.8MPa, the aging temperature is 180°C, and the aging is 24h , to obtain a Y-type zeolite molecular sieve precursor;

[0028] (2) Dissolve cetyltrimethylammonium bromide (CTAB) in deionized water at a mass ratio of 22:100, then add ammonia water with an excess concentration of 15% and the precursor solution prepared in step A, slowly drop Add 10% sulfuric acid solution until the pH is 9-10, control the dropping rate to 15mL / min, stir slowly for 4 hours, place the solution in a closed container, crys...

Embodiment 2

[0032] (1) Weigh 13 parts by mass of sodium metaaluminate, 8 parts by mass of sodium hydroxide, and 19 parts by mass of water glass solution with a mass concentration of 11%, add sodium metaaluminate and sodium hydroxide to the water glass solution for heating and stirring , the stirring temperature is 85°C, the stirring speed is 50rpm, until the solution is completely clear, the clear solution is transferred to a polytetrafluoroethylene airtight container for aging, the aging pressure is 1.5MPa, the aging temperature is 160°C, and aging for 24h , to obtain a Y-type zeolite molecular sieve precursor;

[0033] (2) Dissolve cetyltrimethylammonium bromide (CTAB) in deionized water at a mass ratio of 17:100, then add ammonia water with an excess concentration of 14% and the precursor solution prepared in step A, slowly drop Add 10% sulfuric acid solution until the pH is 9-10, control the dropping rate to 20mL / min, stir slowly for 4 hours, place the solution in a closed container, ...

Embodiment 3

[0037] (1) Weigh 8 parts by mass of sodium metaaluminate, 10 parts by mass of sodium hydroxide, and 14 parts by mass of water glass solution with a mass concentration of 11%, add sodium metaaluminate and sodium hydroxide to the water glass solution for heating and stirring , the stirring temperature is 67°C, the stirring speed is 85rpm, until the solution is completely clear, the clear solution is transferred to a polytetrafluoroethylene airtight container for aging, the aging pressure is 1.0MPa, the aging temperature is 180°C, and aging for 24h , to obtain a Y-type zeolite molecular sieve precursor;

[0038] (2) Dissolve cetyltrimethylammonium bromide (CTAB) in deionized water at a mass ratio of 20:100, then add ammonia water with an excess concentration of 17% and the precursor solution prepared in step A, slowly drop Add 10% sulfuric acid solution until the pH is 9-10, control the dropping rate to 10mL / min, stir slowly for 4.5h, put the solution in a closed container, cryst...

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Abstract

The invention provides a modified aluminosilicate additive for lithium sulfur battery electrolyte and a preparation method thereof, Y-type molecular sieve precursor was prepared by sodium meta-aluminate, sodium hydroxide and sodium silicate, then mesoporous silicate aluminate was obtained by surfactant and acid-base crystallization, finally mesoporous silicate aluminate was modified by organic lithium salt to make organic lithium source enter mesoporous silicate aluminate pores, and mesoporous silicate aluminate particles loaded with lithium were obtained. The additive prepared by the invention has stable structure, Through the adsorption of modified mesoporous aluminosilicate on polysulfide in electrolyte, The polysulfide is immobilized in the solid particles, which effectively solves theproblem that the electrolyte of the existing lithium sulfide battery is difficult to control the dissolution of lithium polysulfide for a long time, inhibits the polysulfide from passing through theelectrolyte through the separator, thereby keeping the negative electrode material from being corroded, improving the capacity stability of the battery, and improving the long-cycle performance of thebattery.

Description

technical field [0001] The invention relates to the field of lithium-sulfur battery materials, in particular to a modified aluminosilicate additive for lithium-sulfur battery electrolyte and a preparation method thereof. Background technique [0002] In order to reduce the dependence on non-renewable petrochemical resources, and at the same time reduce the exhaust gas emissions that greatly pollute the environment, and with the increase in human demand for power batteries and mobile power equipment, lithium-ion batteries that are environmentally friendly, long cycle life, and high specific capacity Research on batteries is becoming more and more meaningful. [0003] Lithium-sulfur batteries have a theoretical specific energy of up to 2600Wh / kg, which is 3-4 times that of ordinary batteries such as lead-acid batteries, and are far superior to other traditional lithium-ion battery cathode materials. , which has the advantages of relatively low cost, abundant reserves, and non...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052H01M10/42
CPCH01M10/052H01M10/0567H01M10/4235Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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