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Holocellulose composite diaphragm for sodium ion battery as well as in-situ preparation method and application of holocellulose composite diaphragm

A sodium-ion battery, all-cellulose technology, applied in secondary batteries, battery pack parts, separators/films/diaphragms/spacers, etc., can solve the cumbersome process, difficult and time-consuming solvent liquid recovery and reuse and other problems, to achieve the effect of low energy consumption, good electrochemical performance and good thermal stability

Active Publication Date: 2022-06-07
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional sol-gel method to prepare regenerated cellulose is to completely sol the cellulose in the solvent system, make it into a casting solution and then put it into the solvent to solidify to form a film, but the required process is cumbersome and time-consuming. And it is more difficult to recover and reuse the remaining solvent liquid

Method used

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  • Holocellulose composite diaphragm for sodium ion battery as well as in-situ preparation method and application of holocellulose composite diaphragm
  • Holocellulose composite diaphragm for sodium ion battery as well as in-situ preparation method and application of holocellulose composite diaphragm
  • Holocellulose composite diaphragm for sodium ion battery as well as in-situ preparation method and application of holocellulose composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Cut the medium-speed qualitative filter paper into filter paper discs with a diameter of 18-20mm, prepare a 65% zinc chloride solution and heat it to 75°C, put the filter paper disc in the zinc chloride solution for 10s, remove it, and wipe it off The excess zinc chloride solution on the surface of the filter paper disc; after 4h of aging, soaked in water for 4 times, each time for 1h, dried to obtain a full cellulose composite membrane, placed in a 110°C vacuum drying box for 10h to dry the water to assemble the battery.

Embodiment 2

[0075] Cut the medium-speed qualitative filter paper into filter paper discs with a diameter of 18-20mm, prepare a 65% zinc chloride solution and heat it to 75°C, put the filter paper disc in the zinc chloride solution for 10s, remove it, and wipe it off The excess zinc chloride solution on the surface of the filter paper disc was aged for 4 hours, soaked in water for 2 times for 1 hour each time, and dried to obtain an all-cellulose composite membrane, which was placed in a vacuum drying box at 110 °C for 10 hours to dry the water to assemble the battery.

Embodiment 3

[0085] Cut the medium-speed qualitative filter paper into filter paper discs with a diameter of 18-20mm, prepare a 60% zinc chloride solution and heat it to 85°C, put the filter paper disc in the zinc chloride solution for 8s, remove it, and wipe it off After 4 hours of aging, the excess zinc chloride solution on the surface of the filter paper disc was soaked in water for 4 times, 1 hour each time, and then placed in a vacuum drying box at 110 °C for 10 hours to dry the water to assemble the battery.

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Abstract

The invention discloses a holocellulose composite diaphragm for a sodium ion battery and an in-situ preparation method and application of the holocellulose composite diaphragm, the preparation method comprises the following steps: cellulose filter paper is immersed in a zinc chloride aqueous solution with the temperature of 65-85 DEG C, taken out and aged, and the mass concentration of zinc chloride in the zinc chloride aqueous solution is 60-70%; and after aging is completed, soaking with water to wash away residual zinc chloride, and drying to obtain the holocellulose composite diaphragm for the sodium-ion battery. The raw materials used in the method are renewable, degradable, green and environment-friendly, and the solvent used in the preparation process is a green solvent, low in cost and easy to recover. The operation method is simple, convenient and feasible, the energy consumption is low, the selectable range of raw materials is wide, and the method has the basis of realizing large-scale production. The prepared holocellulose composite diaphragm has a multi-layer structure, the thickness is 120-400 [mu] m, the porosity is 40-80%, the electrolyte absorption rate is 150-400%, the thermal stability is excellent, certain safety is achieved, the electrochemical performance is good, and the holocellulose composite diaphragm is superior to a common glass fiber diaphragm.

Description

technical field [0001] The invention relates to the field of new energy, in particular to an all-cellulose composite membrane for sodium ion batteries and an in-situ preparation method and application thereof. Background technique [0002] Lithium-ion batteries (LIBs) have been widely used in portable electronics, and electric vehicles have developed rapidly in recent years, and the demand for lithium-ion batteries is also growing. Due to the same main group as lithium and similar chemical properties, sodium-ion batteries are considered to be an ideal choice for the next generation of large-scale energy storage technology due to their abundant resources and low price, and have also attracted extensive research by researchers in recent years. As a key material that isolates the positive and negative electrodes of the battery and provides a transport channel for sodium ions, the separator plays a very important role in the electrochemical performance and safety of the battery....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/457H01M10/054H01M50/40
CPCH01M50/40H01M50/403H01M50/457H01M10/054Y02E60/10
Inventor 林秀仪周弘扬古今沈程鹏章伟伟胡传双涂登云
Owner SOUTH CHINA AGRI UNIV