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Preparation method and application of moisture-absorbing double-layer gel polymer electrolyte

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

Active Publication Date: 2021-09-24
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Preparation method and application of moisture-absorbing double-layer gel polymer electrolyte
  • Preparation method and application of moisture-absorbing double-layer gel polymer electrolyte
  • Preparation method and application of moisture-absorbing double-layer gel polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The gel polymer was prepared by impregnating the hydrogel in PEG200.

[0036] The scanning electron micrographs and stress-strain curves of the frozen-thawed bacterial cellulose hydrogel prepared in the present embodiment 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 showed a denser structure and smaller pore size, which contributed to the enhancement of its mechanical properties, and the thawed BC hydrogel The tensile strength increased rapidly from 3.55MPa to 18.16MPa.

[0037] The structural 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 and discharge curve of the battery at -20°C is as follows image 3 Shown in 32.

[0038] ...

Embodiment 2

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

[0041] The cycle performance graph of the hygroscopic double-layer gel polymer electrolyte applied to the zinc-ion hybrid battery prepared in this example is as follows Figure 5 shown. At -20°C, after 300 cycles, 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] The gel polymer was prepared by impregnating the hydrogel in PEG400.

[0044] The cycle performance graph of the hygroscopic double-layer gel polymer electrolyte applied to the zinc-ion hybrid battery prepared in this example is as follows Figure 6 shown. At -20°C, after 300 cycles, 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 moisture-absorbing double-layer gel polymer electrolyte and application of the moisture-absorbing double-layer gel polymer electrolyte to a zinc ion hybrid battery device. The moisture-absorbing double-layer gel polymer electrolyte is prepared by the following steps: filling frozen-unfrozen bacterial cellulose hydrogel with a polymer, soaking in an electrolyte containing Zn < 2 + > and Li < + >, drying, and placing in a constant-temperature and constant-humidity environment to spontaneously absorb moisture, thereby obtaining the moisture-absorbing double-layer gel polymer electrolyte. The electrolyte provided by the invention is prepared by adopting a reversible process of 'water in salt ', is low in price and environment-friendly, and can effectively improve the ionic conductivity of the gel electrolyte by regulating and controlling the water absorption capacity. The double-layer structure of the electrolyte is suitable for the zinc ion hybrid battery, a battery negative electrode comprises metal zinc foil, zinc powder, zinc alloy and the like, and a positive electrode active material comprises lithium iron phosphate, lithium cobalt oxide, lithium manganate, lithium nickelate and other transition metal oxides capable of reversibly intercalating and deintercalating lithium ions. The assembled battery can show excellent cycling stability at -20 DEG C, which has a wide application prospect 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 zinc-ion hybrid battery devices, 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 the water-driven parasitic reactions and inherently low freezing point of water mol...

Claims

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Application Information

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Patent Type & Authority Applications(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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