Lithium battery fire-extinguishing filling material additive preparation method

A technology for preparation of additives and filling materials, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as flammable electrolyte leakage, and achieve excellent thermal stability, easy synthesis, and high flexibility Effect

Inactive Publication Date: 2018-12-21
浙江蓝盾电工新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in the leakage of flammable electrolyte from the battery and, in the case of disposable lithium batteries, the release of flammable lithium metal
Then there is a huge prob

Method used

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  • Lithium battery fire-extinguishing filling material additive preparation method
  • Lithium battery fire-extinguishing filling material additive preparation method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example one:

[0018] Take PEO-based full fire extinguishing additive as an example:

[0019] The embodiment of the present invention provides a preparation method of a lithium battery fire extinguishing filling material additive. The method includes the following steps:

[0020] 1) Preparation of PEO (polyethylene oxide)-based fire extinguishing additive: accurately weigh PEG (polyethylene glycol) and silane coupling agent according to the mass ratio. The mass ratio of PEG and silane coupling agent is 5:1. 20% THF (tetrahydrofuran) is used as a solvent to dissolve PEG and silane coupling agent. After the two are mixed, they are reacted under the protection of nitrogen. The reaction is carried out in the reactor for 4 hours. The stirring speed is 70 rpm and the reaction time. The reaction temperature was controlled at 60 degrees Celsius for 4 hours.

[0021] 2) Filter the product of step 1) to remove the unreacted silane coupling agent, leave the product PEG-silane conjugate a...

Example Embodiment

[0028] Embodiment two:

[0029] The difference from the first embodiment is that the physical doped dimethyl methyl phosphate fire extinguishing additive is selected as an example. The method includes:

[0030] 1) Accurately weigh the PEG and the silane coupling agent in a mass ratio of 5:1, use an appropriate amount of THF as a solvent to dissolve the PEG and the silane coupling agent, and mix the two and react under the protection of nitrogen. The product of the previous step is filtered and reacted with nano silica hydrosol under the protection of nitrogen, and the reaction product is centrifuged. Finally, the product of the previous step is reacted with PPG, and the resulting solution is mixed with dimethyl methyl phosphate (25%) and stirred uniformly, and poured on a PTFE mold to obtain a physically doped dimethyl methyl phosphate polymer electrolyte.

[0031] 2) Performance test: Put the product on the workstation for infrared absorption characteristic test, the results are sh...

Example Embodiment

[0032] Example three:

[0033] The difference from the first and second embodiments is:

[0034] Using a new type of dimethyl methyl phosphate fire extinguishing additive, the method includes:

[0035] 1) Accurately weigh the dimethyl methyl phosphate and PPG according to the mass ratio of 2:1, use an appropriate amount of chloroform as a solvent to dissolve the dimethyl methyl phosphate and PPG and add an appropriate amount of catalyst. After the two are mixed, under the protection of nitrogen reaction. Mix the product from the previous step with PEG, add an appropriate amount of catalyst to react under the protection of nitrogen. Finally, the product of the previous step is reacted with the silanized PEG, and the resulting solution is poured on a PTFE mold to obtain a phosphate composite electrolyte.

[0036] 2) Performance test: Put the product on the workstation to test the combustion characteristics such as limiting oxygen index. The results are shown in Table 1. It can be seen...

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Abstract

The invention discloses a lithium battery fire-extinguishing filling material additive preparation method. Preparation of a PEO-based fire-extinguishing additive comprises the steps that according toa mass ratio of 5 to 1, PEG and a silane coupling agent are accurately weighed, an appropriate amount of THF is used as a solvent for dissolving the PEG and the silane coupling agent, and after the PEG and the silane coupling agent are mixed, reaction is carried out under protection of nitrogen; a product, subjected to filtering treatment, of the last step is reacted with nano-silica hydrosol under protection of nitrogen, and a reaction product is subjected to centrifugation treatment; finally, the product of the last step is reacted with PPG. A product is observed through an electron microscope, a result shows that the product is good in reaction evenness, and both the dispersity and the mobility are up to standards; the novel high-flame retardation fire-extinguishing additive is easy tosynthesize, easy to use and low in waste, and a better choice is provided for replacing a toxic halogen-flame retardant.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a method for preparing a lithium battery fire extinguishing filling material additive. Background technique [0002] Lithium batteries can spontaneously ignite and subsequently explode due to overheating. Causes of overheating include electrical shorts, rapid discharges, overcharging, manufacturing defects, poor design, or mechanical damage, to name a few. Overheating can lead to the process of "thermal runaway", that is, an exothermic reaction inside the battery will cause the internal temperature and pressure of the battery to rise at a rapid rate, thereby wasting energy. [0003] Once a battery cell goes into thermal runaway, it can generate enough heat that the adjacent battery cells also go into thermal runaway. As each battery cell in turn ruptures and releases its contents, a recurring flame is created. This causes the battery to leak flammable electrolyte and, if a primary...

Claims

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Application Information

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IPC IPC(8): C09K21/14H01M10/42
CPCC09K21/14H01M10/4235Y02E60/10
Inventor 金法泉罗俊
Owner 浙江蓝盾电工新材料科技有限公司
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