Polymer composite solid electrolyte and preparation method and application thereof

A solid electrolyte and polymer technology, applied in the field of electrochemical energy storage, can solve the problems of inability to form rechargeable and dischargeable lithium-sulfur batteries, reduce the cycle life of lithium-sulfur batteries, loss of active materials, etc. The effect of migrating channels, improving cycle life and specific capacity

Active Publication Date: 2017-02-22
NANJING BOCHI NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, elemental sulfur is an electronic insulator at room temperature, and it is also an ionic insulator. Directly using elemental sulfur as the positive electrode cannot form a lithium-sulfur battery that can be charged and discharged.
At the same time, during the charging and discharging process of lithium-sulfur batteries, sulfur will form lithium polysulfide with lithium, an intermediate product that is easily soluble in electrolyte solution, resulting in a "shuttle effect", resulting in a large loss of active materials and deposition on the lithium metal negative electrode of the battery , reduce the cycle life of lithium-sulfur batteries
In addition, the final product of lithium-sulfur battery discharge, the volume of lithium sulfide is 70-80% larger than that of sulfur, which will cause the positive electrode to be damaged and reduce the cycle life.
In addition, it was found that in the all-solid-state battery structure, the solid-solid contact can prevent the dissolution of polysulfides formed by the electrode reaction in the lithium-sulfur battery, but in the existing lithium-sulfur battery system, the matching of the electrolyte and the battery There are still some problems, so it is necessary to find a new lithium-sulfur battery system to further improve the cycle performance of the battery

Method used

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  • Polymer composite solid electrolyte and preparation method and application thereof
  • Polymer composite solid electrolyte and preparation method and application thereof
  • Polymer composite solid electrolyte and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of Polymer Composite Solid Electrolyte

[0035] Polyphenylene sulfide (PPS) particles were mixed with lithium hydroxide (LiOH) and lithium carbonate (Li 2 CO 3 ) are mixed according to the mass ratio of 100:16:16, and then the mixture is made into a powder with a particle size of less than 1 μm by a jet mill. Dichlorodicyanoquinone (DDQ) was added to the above mixture according to the mass ratio of polyphenylene sulfide to dichlorodicyanoquinone being 100:50. The mixture was then placed in a sealed reaction vessel. Heating to 260° C. for 1 hour, and then cooling to room temperature to obtain a polymer composite solid electrolyte. The conductivity of the polymer composite solid electrolyte is shown in Table 1.

[0036] Preparation of Sulfur Composite Electrode Materials

[0037] The above-mentioned polymer composite solid electrolyte was taken out from the reactor and ground into fine particles, and then the polymer composite solid electrolyte was pulveri...

Embodiment 2

[0044] Preparation of Polymer Composite Solid Electrolyte

[0045]Polyphenylene sulfide (PPS) particles and lithium hydroxide (LiOH) were mixed according to a mass ratio of 100:30, and then the mixture was made into a powder with a particle size of less than 0.5 μm by jet milling. Chloro-p-benzoquinone was added to the above mixture according to the mass ratio of polyphenylene sulfide and tetrachloro-p-benzoquinone of 100:40, and then the mixture was placed in a sealed reaction vessel. Heated to 210° C. for 2 hours, then cooled to room temperature to obtain a polymer composite solid electrolyte. The conductivity of the polymer composite solid electrolyte is shown in Table 1.

[0046] Preparation of Sulfur Composite Electrode Material

[0047] The polymer composite solid electrolyte was taken out from the reactor and ground into fine particles, and then the polymer composite solid electrolyte was pulverized to a particle size of 2 μm by a jet mill. The polymer composite solid...

Embodiment 3

[0053] Preparation of Polymer Composite Solid Electrolyte

[0054] Polyphenylene sulfide (PPS) particles were mixed with lithium hydroxide (LiOH) at a mass ratio of 100:50, and then the mixture was made into a powder with a particle size of 0.5 μm by jet mill. Add tetracyanoquinodimethane to the above mixture according to the mass ratio of polyphenylene sulfide to tetracyanoquinodimethane of 100:60. The mixture was then placed in a sealed reaction vessel. Heating to 300°C for 0.5 hours, then cooling to room temperature to obtain a polymer composite solid electrolyte, the conductivity of the polymer composite solid electrolyte is shown in Table 1.

[0055] Preparation of Sulfur Composite Electrode Material

[0056] The above-mentioned polymer composite solid electrolyte was taken out from the reactor and ground into fine particles, and then the polymer composite solid electrolyte was pulverized to a particle size of 1 μm by a jet mill. Mix the polymer composite solid electro...

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Abstract

The invention discloses a polymer composite solid electrolyte and a preparation method and application thereof. The polymer composite solid electrolyte is prepared from polyphenylene sulfide, a lithium salt and an organic quinones electron acceptor and is taken as a polymer composite solid electrolyte of a lithium-sulfur battery, the polymer composite solid electrolyte, carbon black and elemental sulfur are fabricated to a composite sulfur electrode material, and thus, a novel lithium-sulfur battery system is formed. The high-molecular polymer composite solid electrolyte provides a relatively good lithium ion migration passage, the lithium ion conductivity of a composite positive electrode material is improved, the high-molecular polymer composite solid electrolyte has certain rigidity and toughness, the volume change of a positive electrode after charge and discharge of the lithium-sulfur battery is buffered, the discharge specific capacity of the lithium-sulfur battery is improved, and the cycle lifetime of the lithium-sulfur battery is prolonged.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a polymer composite solid electrolyte and its preparation method and application. Background technique [0002] A lithium-sulfur battery is a secondary battery that uses lithium metal as the negative electrode and a sulfur-containing material as the positive electrode. The theoretical specific capacity of lithium metal is 3861mAh / g, and the theoretical specific capacity of sulfur element reaches 1675mAh / g, so that the theoretical energy density of lithium-sulfur batteries is as high as 2600Wh / kg. At the same time, lithium-sulfur batteries have the advantages of abundant sulfur reserves, low price, and environmental friendliness, which have great application prospects and development value. But at the same time, elemental sulfur is an electronic insulator at room temperature, and it is also an ionic insulator. Directly using elemental sulfur as the positive electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0565H01M4/139
CPCH01M4/139H01M10/0525H01M10/0565Y02E60/10
Inventor 晁流
Owner NANJING BOCHI NEW ENERGY CO LTD
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