A kind of preparation method of hygroscopic double-layer gel polymer electrolyte and its application

A double-layer gel and polymer technology, applied in the direction of electrolytes, acidic electrolytes, aqueous electrolytes, etc., can solve problems such as battery failure, high manufacturing costs, salting out, etc., achieve stable cycle life, long cycle life, and inhibit parasitic reactions Effect

Active Publication Date: 2022-07-12
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a solution with too high a salt concentration will cause salting-out at low temperatures, and the crystallization of the electrolyte will cause the battery to fail.
At the same time, high salt concentration will also bring high manufacturing costs
So, just using the "water in salt" strategy to make the battery run at low temperature is not a satisfactory option

Method used

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  • A kind of preparation method of hygroscopic double-layer gel polymer electrolyte and its application
  • A kind of preparation method of hygroscopic double-layer gel polymer electrolyte and its application
  • A kind of preparation method of hygroscopic double-layer gel polymer electrolyte and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Gel polymers were prepared by dipping the hydrogel in PEG200.

[0036] The scanning electron microscope image and the stress-strain curve of the frozen-thawed bacterial cellulose hydrogel prepared in this example are as follows figure 1 and figure 2shown. Among them, 11 and 21 are original bacterial cellulose gels, and 12 and 22 are freeze-thawed bacterial cellulose gels. The three-dimensional porous structure plays a key role in promoting ion transport, in which the thawed BC hydrogel shows a denser structure and smaller pore size, which promotes the enhancement of its mechanical properties. The tensile strength increased rapidly from 3.55MPa to 18.16MPa.

[0037] The structure diagram of the zinc-ion hybrid battery prepared in the embodiment of the present invention is as follows: image 3 Shown in 31; the constant current charge-discharge curve of the battery at -20°C is as follows image 3 shown in 32.

[0038] The cycle performance of the hygroscopic double-...

Embodiment 2

[0040] The gel polymer was prepared by dipping the hydrogel in PEG300.

[0041] The cycle performance of the hygroscopic double-layer gel polymer electrolyte prepared in this example applied to a zinc-ion hybrid battery is shown in the figure below Figure 5 shown. After 300 cycles at -20°C, the discharge specific capacity of the battery is 43.9mAh g -1 , the capacity retention rate is 74.76%, and the Coulombic efficiency is about 100%.

Embodiment 3

[0043] Gel polymers were prepared by dipping the hydrogel in PEG400.

[0044] The cycle performance of the hygroscopic double-layer gel polymer electrolyte prepared in this example applied to a zinc-ion hybrid battery is shown in the figure below Image 6 shown. After 300 cycles at -20°C, the discharge specific capacity of the battery is 34.1mAh g -1 , the capacity retention rate is 73.87%, and the Coulombic efficiency is about 100%.

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Abstract

The invention discloses a preparation method of a hygroscopic double-layer gel polymer electrolyte and its application to a zinc-ion hybrid battery device. The hygroscopic double-layer gel polymer electrolyte is filled with a polymer into a frozen-thawed bacterial cellulose hydrogel, and contains Zn 2+ and Li + After soaking and drying in the electrolyte, it is obtained by placing it in a constant temperature and humidity environment to absorb moisture spontaneously. The electrolyte of the present invention is prepared by a reversible process of "water-in-salt", which is inexpensive and environmentally friendly, and the ionic conductivity of the gel electrolyte can be effectively improved by regulating the amount of water absorption. The double-layer structure of the electrolyte is suitable for zinc-ion hybrid batteries, in which the negative electrode of the battery includes metal zinc foil, zinc powder and zinc alloy, etc., and the positive active material includes lithium iron phosphate, lithium cobaltate, lithium manganate, lithium nickelate, etc. Reversible deintercalation Transition metal oxides of lithium ions. The assembled battery can exhibit excellent cycling stability at ‑20°C, which has broad application prospects in the field of low-temperature energy storage.

Description

technical field [0001] The invention relates to a preparation method of a hygroscopic double-layer gel polymer electrolyte and its application to a zinc-ion hybrid battery device, belonging to the technical field of zinc-ion batteries. Background technique [0002] At present, the application of rechargeable batteries in energy storage is expanding, including consumer electronics, electric vehicles, drones and small satellites. For traditional lithium-ion batteries, there are greater risks in daily life due to the flammability and volatility of organic electrolytes. Compared with lithium-ion batteries, aqueous batteries have attracted extensive attention due to their non-flammability, environmental friendliness, and suitable energy density, and have high application value in the field of large-scale energy storage. [0003] However, the development of aqueous batteries is still limited due to water-driven parasitic reactions and the inherently low freezing point of water mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J9/40C08J9/36C08L1/02H01M10/38
CPCC08J9/28C08J9/40C08J9/36H01M10/38C08J2301/02C08J2201/0484H01M2300/0005H01M2300/0085H01M2300/0094Y02P70/50
Inventor 邓先宇闫长媛王洋洋陈子璇
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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