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Flame Retardant Additive in Electrolyte-save you Lithium Battery Burning

wallpapers News 2020-02-12

So one can reduce the flammability of the electrolyte, including a small quantity of flame retardant additive to the electrolyte of the lithium-ion battery can efficiently enhance the thermal balance of the electrolyte, thereby improving the protection of the lithium-ion battery.  The use of flame retardant additives is easy and powerful and is a study hotspot of liquid natural electrolytes for lithium-ion batteries.

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The organic solvent in the electrolyte causes combustion due to the chain response itself, The flame retardant is based on the precept of catalytic removal of loose radicals (together with H. or .OH) with high reactivity and combustion response, inhibiting the incidence of these chain reactions, and efficaciously improving the safety of lithium-ion batteries. These loose radicals keep a gasoline phase combustion reaction through a cascade of propagation mechanisms.

Flame retardants terminate this combustion reaction by means of viable mechanisms:

1 chemical response

Theflame retardant decomposes at high temperature to shape loose radicals (inclusive of PO2. or HPO2.) and terminates the chain-propagation response by using eliminating H. or.OH, radicals;

2 physical process

The flame retardant paperwork a thermal insulation layer among the condensed country and the gasoline segment, stopping the combustion response from proceeding. At present, the flame retardant mechanism generally frequent is the hydrogen radical trapping mechanism.

not unusual lithium-ion battery electrolyte flame retardant components in particular include (s)phosphoric acid ester flame retardants and phosphorus-nitrogen (P-N) composite flame retardants.they're effective in inactivating free radicals from the decomposition of organic carbonates and destroying the combustion due to chain-propagating reactions. The phosphate ester flame retardants especially consist of a few alkyl phosphates and phenyl phosphate compounds.  These compounds are liquid at room temperature and feature a sure mutual solubility with organic media. They are important flame retardant components for lithium-ion battery electrolytes.

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Trimethyl phosphate (TMP) and triethyl phosphate (TEP) are the various first flame retardants to be studied. But, TMP and TEP aren't stable on the bad graphite electrode at a low discount capability.because of the higher phosphorus content in TMP, TMP has a better flame retardant impact than TEP.however, its compatibility with graphite anodes is even worse, this means that that a balance among flame retardancy and reduction stability is sought. The flammability of the electrolyte is decreased because of the addition of the flame retardant, but that is at the cost of different houses of the battery, together with the ionic conductivity of the electrolyte and the reversibility of the battery.

ways to improve the discount stability of phosphate esters are:

1 boom the carbon atom on the alkyl institution;

2 replacing part of the alkyl organization with a phenyl group;

3 assemble a cyclic phosphate shape.

Studies have proven that phosphite compounds also have very good flame retardant effects.

The benefits of phosphite flame retardants compared to phosphate flame retardants are:、

1 Conducive to the formation of SEI movie;

2 it may inactivate PF5. prevent it from detrimental the SEI membrane, and maintain the electrode strong.

The composite flame retardant makes use of the synergistic effect between distinctive flame retardant factors to enhance the flame retardant effect and decrease the quantity of flame retardant.

The composite flame retardant typically utilized in lithium-ion battery electrolytes is especially P-N flame retardant. A cyclophosphamide compound is an excellent flame retardant. The advantages of this compound encompass:

1 because of the lifestyles of the annular shape, the phosphorus content material within the flame retardant is better, and the flame retarding effect is stepped forward;

2 incredible stability at each the advantageous electrode and the terrible graphite electrode at a decrease potential.


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