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Diaphragm capable of preventing lithium dendrites and rechargeable lithium battery

A lithium battery and lithium dendrite technology, which is applied in the field of diaphragm preparation, can solve the problems of no lithium ion transmission channel, the inability to inhibit the growth of lithium dendrites or prevent the penetration of lithium dendrites, and the inability to charge and discharge lithium battery diaphragms. , to achieve excellent cycle characteristics, facilitate the transfer of lithium ions, and improve safety and reliability

Inactive Publication Date: 2019-08-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the conventional commercial products of PBO film are relatively dense, there is no channel for lithium ion transmission, and there are defects in lithium ion conduction, so commercial PBO film cannot be directly used in lithium ion batteries
Due to the high strength of PBO, the traditional cold-drawing and heating treatment process is not suitable for manufacturing porous PBO separators, and the through-holes obtained by the cold-drawing and heating treatment process of the separator cannot inhibit the growth of lithium dendrites or prevent the penetration of lithium dendrites.
Therefore, like other traditional lithium-ion battery separators, it cannot be directly used as a rechargeable lithium battery separator

Method used

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  • Diaphragm capable of preventing lithium dendrites and rechargeable lithium battery
  • Diaphragm capable of preventing lithium dendrites and rechargeable lithium battery
  • Diaphragm capable of preventing lithium dendrites and rechargeable lithium battery

Examples

Experimental program
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preparation example Construction

[0040] The preparation method of the positive electrode is: take the positive electrode material, acetylene black and PBO resin powder, grind and mix them evenly, add DMSO as a dispersant, prepare a paste, apply it on the aluminum film, dry it at 60°C, and then dry it at 100Kg cm -2 Under a certain pressure, the dried pole piece is pressed into shape to obtain a positive electrode; wherein, the mass ratio of the positive electrode material, acetylene black, and PBO resin powder is 95:5:5.

[0041] The positive electrode material is a commercially available layered structure positive electrode material LiMO 2 , spinel structure cathode material LiM 2 o 4 And olivine structure cathode material LiMPO 4 (M is one of Co, Ni, Mn, or a mixture of two or more materials in an equal molar ratio).

Embodiment 1P

[0042] Embodiment 1PBO solution preparation

[0043] Take 100mL dimethyl sulfoxide (DMSO), add 1.1g PBO resin, and disperse with ultrasonic vibration (ultrasonic frequency 40kHz) for 30 minutes to obtain a 1wt% PBO solution.

Embodiment 2

[0044] Example 2 Dendritic Microporous Diaphragm Preparation

[0045] Get 100mL dimethyl sulfoxide (DMSO), add 11g PBO resin, obtain 10wt% PBO solution after ultrasonic vibration (ultrasonic frequency 40kHz) disperse for 30 minutes; Get PBO solution (1mL) and pour on flat glass (30×40× 1 mm), flattened with a 500 μm applicator, immersed in a Dewar bottle filled with liquid nitrogen for flash-freezing film formation, moved to a freeze-vacuum dryer for 24 hours to remove the solvent DMSO, and obtained a dendritic microporous membrane, such as figure 1 shown.

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Abstract

The invention relates to the technical field of lithium batteries, and aims to provide a diaphragm capable of preventing lithium dendrites and a rechargeable lithium battery. The preparation method comprises the following steps: ultrasonically dispersing dimethyl sulfoxide and PBO resin, and pouring the dimethyl sulfoxide and the PBO resin on flat glass for flash freezing to form a film; performing freeze vacuum drying to remove the solvent to obtain a PBO diaphragm; adding THF, lithium sulfide and elemental sulfur under the protection of argon; after raising the temperature for reaction, filtering to obtain a lithium polysulfide solution; adding the PBO diaphragm into the lithium polysulfide solution under the protection of argon for dipping; and washing and drying to obtain the lithium polysulfide doped dendritic microporous diaphragm. According to the invention, the safety and reliability of the rechargeable lithium battery are greatly improved, and directional dendritic pore channels are obtained through flash freezing and pore forming, so that lithium ion transfer is facilitated. The content of lithium ions in the film is increased, the internal impedance of the lithium battery is reduced, the growth of lithium dendrites in the film is passivated, the lithium dendrites are greatly prevented from penetrating through the diaphragm, the possibility of contact between the poly-lithium dendrites and the positive electrode in the charging and discharging process is eliminated, and the short circuit of the battery is prevented.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a diaphragm capable of preventing lithium dendrites using PBO resin as a raw material. Background technique [0002] Lithium metal is the solid electrode material with the highest energy density. The rechargeable lithium battery is a secondary battery with lithium metal as the negative electrode material, which has the advantages of light weight and large capacity. The specific energy of rechargeable lithium batteries is much higher than that of commercially widely used lithium-ion batteries. Moreover, lithium batteries are environmentally friendly elements and basically have no pollution to the environment. Rechargeable lithium battery is a very promising secondary battery. [0003] The rechargeable lithium battery uses a liquid electrolyte. During discharge, the negative electrode reaction is that lithium loses electrons and becomes lithium i...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M10/42
CPCH01M10/052H01M10/4235H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 李洲鹏李岩刘宾虹
Owner ZHEJIANG UNIV
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