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Electrolyte for battery and battery using electrolyte

An electrolyte and battery technology, applied to secondary batteries, circuits, electrical components, etc., can solve the problems of increased heat generation of batteries, failure to improve battery performance of ternary lithium batteries, increase battery internal resistance, etc., to improve utilization efficiency , Improve antioxidant capacity, inhibit oxidation decomposition effect

Pending Publication Date: 2022-04-05
SHANGHAI RUIPU ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the ternary lithium battery, the combination of the fluoroester compound and the cyanocyclic unsaturated hydrocarbon cannot produce the same effect as in the lithium cobaltate battery, and the cyanocyclic unsaturated hydrocarbon When the temperature is high, a polymerization reaction will occur, and the product will increase the internal resistance of the battery, which will increase the heat generation of the battery, thus vicious circle
Therefore, the battery performance of the ternary lithium battery cannot be improved

Method used

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  • Electrolyte for battery and battery using electrolyte
  • Electrolyte for battery and battery using electrolyte
  • Electrolyte for battery and battery using electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of lithium electronic electrolyte, comprising the steps of:

[0038] In the glove box, ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) were mixed according to the mass ratio of 3:2:5, and then 6% mass fraction was added to the mixed solvent The fluoroester compound (1); then add 1.1M lithium hexafluorophosphate to dissolve. After that, 1% vinylene carbonate (VC) and 0.8% lithium difluorophosphate (LiPO 2 f 2 ), 1% vinyl sulfate (DTD), plus 0.5% trimethyl silicon carbonate compound (5).

[0039] Inject the prepared lithium-ion battery electrolyte into the fully dried 4.45V LiNi 0.6 co 0.2 mn 0.2 o 2 / Graphite soft-pack battery, after shelving at 45°C, high-temperature fixture formation, and secondary sealing, the battery performance test was carried out to obtain the battery used in Example 1.

Embodiment 2-32

[0045] Except that the fluorinated ester compound solvent and the silicon trimethylcarbonate compound were added as shown in Table 1, the others were the same as in Example 1. The electrolyte formulations of each embodiment and comparative example are shown in Table 1.

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Abstract

The invention discloses an electrolyte for a battery and the battery using the electrolyte. The electrolyte for the battery comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent contains one or more of chain carbonic ester, cyclic carbonic ester, carboxylic ester and fluoro-ester substances, the additive contains trimethyl silicon carbonate substances, and the invention also discloses a battery containing the electrolyte containing the fluoro-ester substances and the trimethyl silicon carbonate substances. According to the invention, the fluoro-ester substance is good in wettability, has the characteristic of flame retardance and can form a low-impedance SEI film on a negative electrode, the addition of the trimethylsilyl carbonate substance can generate a layer of compact oxide film on the surface of a positive electrode, the charge transfer capability of the electrode is improved, and through the synergistic effect of the trimethylsilyl carbonate substance and the trimethylsilyl carbonate substance, the charge transfer capability of the electrode is improved. The high-temperature and high-pressure cycle performance and the safety performance of the battery are improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a battery electrolyte and a battery using the electrolyte, in particular to an electrolyte containing fluorinated esters and trimethylsilicon carbonate substances and a battery using the electrolyte Lithium Ion Battery. Background technique [0002] Since Tesla spontaneously ignited on April 21, 2019, new energy electric vehicle spontaneous combustion accidents have occurred frequently. With the increase in the installed capacity of ternary lithium batteries and square shell batteries, the causes of accidents have a common feature. From the perspective of battery type, most of the accident vehicles are equipped with ternary lithium-ion batteries. [0003] The standard operating voltage of the ternary power lithium battery is 3.6-3.8V, and the energy density is 140-160wh / kg. High energy density and good low temperature performance are the biggest advantages of the ternary power lithium b...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCY02E60/10
Inventor 曹辉付逊刘婵侯敏
Owner SHANGHAI RUIPU ENERGY CO LTD
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