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Preparation of a flexible electrode-electrolyte integrated all-solid-state lithium-sulfur battery

A flexible electrode, lithium-sulfur battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, lithium batteries, etc.

Active Publication Date: 2021-07-06
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods treat the symptoms but not the root cause, and can only inhibit the dissolution of polysulfides to a certain extent. To fundamentally solve the above problems, the optimal solution is to replace liquid electrolytes with solid electrolytes

Method used

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  • Preparation of a flexible electrode-electrolyte integrated all-solid-state lithium-sulfur battery
  • Preparation of a flexible electrode-electrolyte integrated all-solid-state lithium-sulfur battery
  • Preparation of a flexible electrode-electrolyte integrated all-solid-state lithium-sulfur battery

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specific Embodiment approach 1

[0027] Specific Embodiment 1: The preparation of a flexible electrode-electrolyte integrated all-solid-state lithium-sulfur battery in this embodiment is carried out according to the following steps:

[0028] 1. Preparation of active material carrier conductive carbon material

[0029] Zinc oxide and fructose were ground in an agate mortar for 1 hour according to the mass ratio of 4:1-2:1, transferred to a ball mill, and ball milled at 250 r / min for 2 hours to obtain a white powder. Transfer the white powder to a tube furnace, raise the temperature to 700° C. under nitrogen, and keep it warm for 1-3 hours to obtain a black powder. The black powder was washed with 20% HCl to remove ZnO, and the black carbon material was obtained by repeated suction filtration.

[0030] 2. Preparation of conductive carbon-sulfur composites

[0031] Grind the black carbon material and elemental sulfur at a ratio of 3:7 for 1 hour, and raise the temperature to 155°C under airtight conditions to ...

specific Embodiment approach 2

[0042] Embodiment 2: The difference between Embodiment 1 and Embodiment 1 is that the mass ratio of fructose and zinc oxide in Step 1 is 4:1 to 2:1, and the others are the same as Embodiment 1.

specific Embodiment approach 3

[0043] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the mass percentages of polyvinylidene fluoride, polyvinylpyrrolidone and ethylenediaminetetraacetic acid added in step three are respectively 80-97%, 1- 10%, 1-10%, and others are the same as those in Embodiments 1 to 2.

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Abstract

The invention relates to the preparation of a flexible electrode-electrolyte integrated all-solid-state lithium-sulfur battery, in particular to a preparation method of a lithium-sulfur battery electrode-electrolyte material. The specific steps of the present invention are as follows: 1. Preparation of conductive carbon material for active material carrier; 2. Preparation of conductive carbon-sulfur composite material; 3. Preparation of polymer electrolyte and binder; 4. Integrated flexible electrode-electrolyte material Preparation; five, battery assembly. The solid-state lithium-sulfur battery prepared by the method of the present invention has good cycle stability, and the discharge specific capacity after 55 cycles is 573.1mAh g ‑1 , the capacity retention rate was 80.89%, and the average Coulombic efficiency was 97.24%. The invention fundamentally solves the irreversible attenuation of capacity caused by the shuttle effect of the liquid lithium-sulfur battery, inhibits the growth of lithium dendrites and effectively solves various safety problems caused by the electrolyte.

Description

technical field [0001] The invention relates to the preparation of a flexible electrode-electrolyte integrated all-solid-state lithium-sulfur battery, specifically the technical field of solid-state lithium-sulfur batteries. Background technique [0002] Undoubtedly, lithium metal due to its low electrochemical potential and high capacity density (3860mAhg -1 ) and become the most widely used anode material. Currently, efforts are being made to study lithium-ion batteries with high energy density, such as lithium-sulfur batteries, lithium-air batteries, multivalent ion, plasma, and solid-state batteries. Lithium-sulfur batteries have an ultra-high theoretical specific capacity (1675mAhg -1 ) and theoretical energy density (2600Whkg -1 ), which are several times that of traditional lithium-ion batteries. [0003] The commercialization of lithium-sulfur batteries faces many challenges, the most notable of which are the shuttling effect caused by the dissolution of polysulf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/38H01M4/62H01M10/052H01M10/0565
CPCH01M4/13H01M4/139H01M4/362H01M4/38H01M4/625H01M10/052H01M10/0565Y02E60/10
Inventor 李丽波单宇航
Owner HARBIN UNIV OF SCI & TECH
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