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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 problem, these fires cannot be treated like "normal" fires and require targeted training, prevention and control planning, proper storage and establishment of fire suppression systems, etc.

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

Embodiment 1

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

[0019] An embodiment of the present invention provides a method for preparing a lithium battery fire extinguishing filling material additive, the method comprising the following steps:

[0020] 1) Prepare 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 the PEG and silane coupling agent is 5:1, use mass Concentration is 20% THF (tetrahydrofuran) as a solvent to dissolve PEG and silane coupling agent, after the two are mixed, react under the protection of nitrogen, react in the reactor for 4 hours, the stirring speed is 70 rev / min, the reaction time For 4 hours, the reaction temperature was controlled at 60°C.

[0021] 2) Filter the product of step 1), remove the unreacted silane coupling agent, leave the product PEG-silane conjugate and react with nano-silica hydrosol under t...

Embodiment 2

[0029] The difference with embodiment one is: select physical doping dimethyl phosphate fire extinguishing additive as an example. The method includes:

[0030] 1) Accurately weigh PEG and silane coupling agent according to the mass ratio of 5:1, dissolve PEG and silane coupling agent with an appropriate amount of THF as a solvent, mix them and react under the protection of nitrogen. The product from the previous step is filtered and reacted with the nano-silica hydrosol under the protection of nitrogen, and the reaction product is centrifuged. Finally, react the product of the previous step with PPG, mix the obtained solution with dimethyl methyl phosphate (25%) and stir evenly, and pour it 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, see the results figure 1 , it can be seen that the infrared absorption characteristic pe...

Embodiment 3

[0033] The difference with Embodiment 1 and 2 is that:

[0034] Using the new dimethyl phosphate fire extinguishing additive, the method includes:

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

[0036] 2) Performance test: put the product on the workstation to test the combustion characteristics such as the limiting oxygen index, the results are shown in Table 1, it can be seen that the limiting oxygen index and flame retardancy o...

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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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