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A functional separator for lithium sulfide battery and a preparation method thereof

A lithium-sulfur battery, functional technology, applied in battery components, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of lithium-sulfur battery volume expansion effect, battery electrochemical performance instability, etc. Achieve the effects of promoting fast migration, good electronic conductivity, and large specific surface area

Active Publication Date: 2019-01-08
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a functional separator for lithium-sulfur batteries and its preparation method for the defects of current lithium-sulfur battery cathode materials, by introducing graphene-cobalt-molybdenum sulfide solid solution composite separators in lithium-sulfur batteries as functional It can absorb lithium polysulfide generated during charging and discharging of lithium-sulfur battery, improve the cycle performance and coulombic efficiency of lithium-sulfur battery; overcome the obvious "shuttle effect" of polysulfide in existing lithium-sulfur battery, and the volume of lithium-sulfur battery Significant swelling effect and unstable electrochemical performance of the battery

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  • A functional separator for lithium sulfide battery and a preparation method thereof
  • A functional separator for lithium sulfide battery and a preparation method thereof
  • A functional separator for lithium sulfide battery and a preparation method thereof

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Embodiment 1

[0034] The raw materials of the functional separator for lithium-sulfur batteries include cobalt-molybdenum sulfide solid solution and graphene.

[0035] The mass ratio of the cobalt molybdenum sulfide solid solution to graphene is 2:1.

[0036] The preparation method of the functional separator for lithium-sulfur battery comprises the following steps:

[0037] (1) Preparation of cobalt-molybdenum sulfide solid solution: mix 1.5g sodium molybdate with cobalt nitrate and thioacetamide according to molar

[0038] Dissolve in 200mL deionized water at a ratio of 1:1:4 to obtain a mixed solution, place the mixed solution in a water bath, heat and stir, and keep warm for 15 minutes when the temperature rises to 90°C; add 15mL of absolute ethanol, and then add 15mL Hydrochloric acid with a concentration of 9mol / L, after the solution is naturally cooled to room temperature, the precipitated product is collected, the precipitated product is repeatedly washed three times with deionized...

Embodiment 2

[0045] The raw materials of the functional separator for lithium-sulfur batteries include cobalt-molybdenum sulfide solid solution and graphene.

[0046] The mass ratio of the cobalt molybdenum sulfide solid solution to graphene is 3:1.

[0047] The preparation method of the functional separator for lithium-sulfur battery comprises the following steps:

[0048] (1) Preparation of cobalt-molybdenum sulfide solid solution: mix 1g of sodium molybdate with cobalt nitrate and thioacetamide according to the molar ratio

[0049] Dissolve in 100mL deionized water at a ratio of 1:1:3 to obtain a mixed solution, place the mixed solution in a water bath, heat and stir, and keep warm for 10 minutes when the temperature rises to 80°C; add 10mL of absolute ethanol, and then add 10mL of concentration It is 8mol / L hydrochloric acid. After the solution is naturally cooled to room temperature, the precipitated product is collected. The precipitated product is washed three times repeatedly with...

Embodiment 3

[0054] The raw materials of the functional separator for lithium-sulfur batteries include cobalt-molybdenum sulfide solid solution and graphene.

[0055] The mass ratio of the cobalt molybdenum sulfide solid solution to graphene is 1:1.

[0056] The preparation method of the functional separator for lithium-sulfur battery comprises the following steps:

[0057] (1) Preparation of cobalt-molybdenum sulfide solid solution: mix 2g of sodium molybdate with cobalt nitrate and thioacetamide according to the molar ratio

[0058] Dissolve in 300mL deionized water at a ratio of 1:1:5 to obtain a mixed solution, place the mixed solution in a water bath, heat and stir, and keep warm for 20 minutes when the temperature rises to 100°C; add 20mL of absolute ethanol, and then add 20mL of concentration It is 10mol / L hydrochloric acid. After the solution is naturally cooled to room temperature, the precipitated product is collected. The precipitated product is repeatedly washed three times wi...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, in particular to a functional separator for lithium-sulfur batteries and a preparation method thereof. The functional separator for lithium sulfide battery comprises cobalt molybdenum sulfide solid solution and graphene. By introducing graphene -Cobalt-molybdenum sulfide solid solution composite membrane into lithium sulfidebatteries as functional membrane to adsorb lithium polysulfide produced in the charge and discharge process of lithium-sulfide battery and improve the cycle performance and coulomb efficiency of lithium-sulfide battery. The invention overcomes the defects of obvious 'shuttle effect' of polysulfide, obvious volume expansion effect of lithium sulfide batteries and instability of electrochemical performance of batteries in existing lithium sulfide batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a functional separator for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the rapid development of the electric vehicle industry and energy storage technology, the global demand for clean and sustainable energy [0003] The task of developing secondary batteries with high energy density is becoming more and more urgent. At present, scientists are committed to seeking new high-energy materials to obtain primary and secondary batteries with higher energy density, so as to meet the needs of the rapid development of industries such as communications and electric vehicles. [0004] Since the 1990s, the development of rechargeable lithium-ion batteries has brought great convenience to human society. [0005] Advantages, high cycle life of lithium-ion secondary batteries; strong charge retention; no environmen...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/406H01M50/431
CPCH01M50/403H01M50/409Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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