Preparation method for forming lithium molybdate diaphragm coating in situ

A technology of lithium molybdate and diaphragm, which is applied in the field of electrochemical energy storage devices, can solve the problems of low utilization rate of active materials, decreased lifespan, and decreased battery capacity, and achieves low utilization rate of active materials, reduced capacity decay rate, and simple The effect of synthetic methods

Pending Publication Date: 2021-11-09
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the reaction mechanism of Li-S batteries involves multi-step reactions and complex phase changes, its commercial promotion has been limited by the low utilization of active materials and the battery capacity caused by the shuttle effect of intermediate polysulfides across the separator. decline and lifespan

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] A preparation method for forming a lithium molybdate diaphragm coating in situ: it is characterized in that it comprises the steps:

[0020] 1. First add 1-2g (NH 4 ) 6 Mo 7 o 24 4H 2 O dissolved in HNO 3 / H 2 In a beaker of O (1:5, v / v), ultrasonically stir for 30 minutes to make it fully mixed.

[0021] 2. Transfer the above solution into the lining of a polytetrafluoroethylene reactor (100ml) and heat it at 200°C for 2h, and wait for it to cool down.

[0022] 3. The product obtained in the reaction kettle was vacuum filtered and washed with deionized water and ethanol in sequence, and finally dried in a vacuum oven at 60°C for 12 hours to obtain white MoO 3 nanorod material.

[0023] 4. Put MoO 3 , Super P, and PVDF were mixed according to the following mass ratio, thoroughly ground for 30 minutes, then dispersed in 10ml of NMP solvent, and magnetically stirred at room temperature for 12 hours to obtain a mixed slurry.

[0024] MoO 3 :Super P:PVDF=45-50:45...

Embodiment 1

[0029] Example 1: At room temperature, 1.6g (NH 4 ) 6 Mo 7 o 24 4H 2 O dissolved in 90ml HNO 3 / H 2 In a beaker of O (1:5, v / v), ultrasonically stir for 30 minutes to make it fully mixed. The above solution was transferred to a polytetrafluoroethylene reactor lining (100ml) and heated at 200°C for 2h, and then cooled. The product obtained in the reaction kettle was vacuum-filtered and washed 5 times with deionized water and ethanol in sequence, and finally dried in a vacuum oven at 60°C for 12 hours to obtain white MoO 3 nanorod material. At room temperature, the MoO 3: Super P: PVDF=0.2g: 0.25g: 0.05g mass ratio mixed, fully ground for 30min, then dispersed in 10ml of NMP solvent, magnetically stirred for 12h to obtain a mixed slurry. Coat the mixed slurry on the ordinary diaphragm with a coating machine and keep it set at room temperature for 1 hour, then transfer it to a vacuum drying oven to dry for 6 hours, and punch the dried coated diaphragm into a 19mm diamete...

Embodiment 2

[0030] Example two: at room temperature, 1.6g (NH 4 ) 6 Mo 7 o 24 4H 2 O dissolved in 90ml HNO 3 / H 2 In a beaker of O (1:5, v / v), ultrasonically stir for 30 minutes to make it fully mixed. The above solution was transferred to a polytetrafluoroethylene reactor lining (100ml) and heated at 200°C for 2h, and then cooled. The product obtained in the reaction kettle was vacuum-filtered and washed 5 times with deionized water and ethanol in sequence, and finally dried in a vacuum oven at 60°C for 12 hours to obtain white MoO 3 nanorod material. At room temperature, the MoO 3 : Super P: PVDF = 0.25g: 0.2g: 0.05g mass ratio mixed, fully ground for 30min, then dispersed in 10ml of NMP solvent, magnetically stirred for 12h to obtain a mixed slurry. Coat the mixed slurry on the ordinary diaphragm with a coating machine and keep it set at room temperature for 1 hour, then transfer it to a vacuum drying oven to dry for 6 hours, and punch the dried coated diaphragm into a 19mm di...

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PUM

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Abstract

The invention relates to a preparation method for forming a lithium molybdate coating on a diaphragm in situ. The method comprises the following steps of: mixing a MoO3 nanorod material with Super P and PVDF (Polyvinylidene Fluoride), scraping slurry, coating on a common diaphragm, sizing at room temperature, drying for later use, assembling with a Li metal negative electrode to form a CR2032 button cell at room temperature, mounting the button cell on an LAND CT2001A terser cell test system, and forming the lithium molybdate diaphragm coating in situ after 100 times of charging and discharging cycles. According to the lithium molybdate diaphragm coating prepared by the method, the phenomena of low utilization rate of active substances and polysulfide shuttle effect in the actual use process of the Li-S battery can be fundamentally overcome; and a simple and convenient synthesis mode is also beneficial to large-scale production and commercialized popularization.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a rechargeable lithium battery, which is applied in the technical field of electrochemical energy storage devices. Background technique [0002] With the increasing popularity of portable electronic devices, hybrid electric vehicles (HEV), and electric vehicles, there is an increasing need for efficient and economical energy storage systems to adapt to it. Since the 1990s, lithium-ion secondary batteries based on the intercalation / extraction reaction mechanism have been dominating the portable electronic device battery market due to their mature technology, small self-discharge, stable electrochemical performance, and long cycle life. However, although the highest energy density of existing commercial lithium-ion batteries is close to the limit, it still cannot meet the requirements of green industries such as electric energy storage. Therefore, it is of great significance to develop next-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M10/052H01M50/403H01M50/449H01M50/46H01M10/058
CPCH01M50/403H01M50/449H01M50/46H01M4/485H01M10/052H01M10/058Y02P70/50Y02E60/10
Inventor 刘瑞平李腾宇李亚男
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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