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High-rate electrolyte suitable for lithium battery of unmanned aerial vehicle

An electrolyte and high-rate technology, applied in the field of lithium-ion batteries, can solve problems such as performance degradation and graphite peeling, and achieve the effects of reduced viscosity and high conductivity

Active Publication Date: 2022-01-28
郑州中科新兴产业技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most power battery electrolytes on the market cannot form a stable solid electrolyte. Decomposition occurs, exfoliating the graphite, resulting in reduced performance

Method used

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  • High-rate electrolyte suitable for lithium battery of unmanned aerial vehicle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A high-rate electrolyte suitable for drone batteries, including the following raw materials: 12g ethylene carbonate, 10g diethyl carbonate, 5g propylene carbonate, 15g ethyl methyl carbonate, 10g ethyl propionate, γ-butyrol 4g ester, 0.56g vinylene carbonate, 0.56g difluoroethylene carbonate, 0.56g diethylene glycol dibenzoate, 8.5g lithium hexafluorophosphate, 0.56g lithium oxalate borate, 1.6g lithium tetrafluoroborate and bis Lithium fluorosulfonyl imide 0.84. These ingredients were prepared and stirred in a glove box according to the above mentioned qualities.

[0016] Inject the prepared electrolyte into the lithium cobalt oxide / graphite soft-pack battery. The design capacity of the soft-pack battery is 16 Ah, and the injection coefficient is 3.5g / Ah. Sub-packaging, capacity separation and other processes to obtain high-power lithium-ion batteries for drones.

Embodiment 2

[0018] A high-rate electrolyte suitable for drone batteries, including the following raw materials: 15g ethylene carbonate, 10g diethyl carbonate, 2g propylene carbonate, 15g ethyl methyl carbonate, 5g ethyl propionate, γ-butyrol 4g ester, 0.5g vinylene carbonate, 0.5g difluoroethylene carbonate, 0.5g diethylene glycol dibenzoate, 7.6g lithium hexafluorophosphate, 0.5g lithium oxalate borate, 0.94g lithium tetrafluoroborate and bis Lithium fluorosulfonyl imide 0.75 g. These ingredients were prepared and stirred in a glove box according to the above mentioned qualities.

[0019] Inject the prepared electrolyte into the lithium cobalt oxide / graphite soft-pack battery. The design capacity of the soft-pack battery is 16 Ah, and the injection coefficient is 3.5g / Ah. Sub-packaging, capacity separation and other processes to obtain high-power lithium-ion batteries for drones.

Embodiment 3

[0021] A high-rate electrolyte suitable for drone batteries, including the following raw materials: ethylene carbonate 8g, diethyl carbonate 10g, propylene carbonate 8g, methyl ethyl carbonate 15g, methyl acetate 12g, γ-butyrolactone 5g, vinylene carbonate 0.58g, difluoroethylene carbonate 0.58g, diethylene glycol dibenzoate 0.58g, lithium hexafluorophosphate 8.8g, dinegative lithium oxalate borate 0.58g, lithium tetrafluoroborate 1.1g and difluoro Lithium sulfonylimide 0.58g. These ingredients were prepared and stirred in a glove box according to the above mentioned qualities.

[0022] Inject the prepared electrolyte into the lithium cobalt oxide / graphite soft-pack battery. The design capacity of the soft-pack battery is 16 Ah, and the injection coefficient is 3.5g / Ah. Sub-packaging, capacity separation and other processes to obtain high-power lithium-ion batteries for drones.

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Abstract

The invention provides a high-rate electrolyte suitable for a lithium battery of an unmanned aerial vehicle. The high-rate electrolyte comprises a lithium salt, an organic solvent and a functional additive. The organic solvent is a common carbonic ester solvent and linear carboxylic ester, and comprises ethylene carbonate, diethyl carbonate, methyl ethyl carbonate, propylene carbonate, ethyl propionate, methyl acetate and gamma-butyrolactone. The lithium salt is lithium hexafluorophosphate, lithium difluoro (oxalato) borate, lithium tetrafluoroborate and lithium bis (fluorosulfonyl) imide. The additives are vinylene carbonate, difluoroethylene carbonate and diethylene glycol dibenzoate. The method of mixing and matching the ethylene carbonate-based solvent and the propylene carbonate-based solvent is adopted, the solvent composition of the electrolyte is optimized, the solvation effect of lithium ions is improved, the impedance of a solid electrolyte interface formed by the electrolyte on the surface of an electrode material is greatly reduced by using the additive, and the electrolyte is more suitable for high-rate charging and discharging of a battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-rate electrolyte suitable for unmanned aerial vehicles. Background technique [0002] In recent years, with the expansion of UAV application fields and the continuous growth of market share, the UAV industry has also received more and more attention, and has been described as "the next blue ocean market". "Heart" will also face higher challenges. As a new type of secondary battery, lithium-ion batteries are very suitable for unmanned aerial vehicles due to their high energy density, high working voltage, and no memory effect. The development of high-power and fast-discharging lithium-ion batteries has also become an unmanned The inevitable trend of machine industry development. [0003] The electrolyte is an important part of the lithium-ion secondary battery, which is responsible for the transfer of positive and negative charges. It plays a vital role in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0569H01M10/0567H01M10/058H01M10/0525H01M10/4235H01M2220/20H01M2300/0042Y02E60/10Y02P70/50
Inventor 刘景博刘艳侠张若涛李蒙王恩阳秦盼盼
Owner 郑州中科新兴产业技术研究院
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