Security lithium-ion power battery electrolyte and lithium-ion power battery

A power battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of negative impact, poor mutual solubility, easy to damage the layered structure of graphite anode, and achieve stable film formation, low impedance, and improved The effect of power output and low temperature output performance

Inactive Publication Date: 2016-12-21
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, some overcharge protection additives have poor miscibility with the electrolyte solvent system,

Method used

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  • Security lithium-ion power battery electrolyte and lithium-ion power battery
  • Security lithium-ion power battery electrolyte and lithium-ion power battery
  • Security lithium-ion power battery electrolyte and lithium-ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Electrolyte preparation steps: In a glove box filled with argon, mix ethylene carbonate, diethyl carbonate and ethyl methyl carbonate according to the mass ratio of EC:DEC:EMC=3:2:5, and then add to the mixed solution Slowly add 1.0mol / L lithium hexafluorophosphate and 0.1mol / L lithium bisfluorosulfonyl imide, and finally add 0.3wt% lithium difluorophosphate (LiPO 2 f 2 ), 1wt% vinyl sulfate (DTD), 0.5wt% vinylene carbonate (VC) and 2wt% o-terphenyl (o-TP), after stirring evenly, the lithium-ion battery electrolyte of Example 1 was obtained.

[0029] Inject the prepared lithium-ion power battery electrolyte into the fully dried graphite / LiNi 0.5 co 0.2 mn 0.3 o 2 In the power battery, after the battery is put on hold at 45°C, formed in a high-temperature fixture and sealed twice, it is routinely divided.

[0030] 1) Cycling performance test at room temperature: At 25°C, charge the divided battery to 4.20V at 1C constant current and constant voltage, with a cut-off ...

Embodiment 2～8

[0039] Embodiment 2~8 and comparative example 1~4

[0040] Examples 2-8 and Comparative Examples 1-4 are the same as Example 1 except that the proportions of the components of the electrolyte are added as shown in Table 1. Table 1 is the composition ratio of each component of the electrolyte solution of Examples 1-8 and Comparative Examples 1-4:

[0041]

[0042]

[0043] Table 1

[0044] In the above Table 1, the abbreviations / chemical formula corresponding names of each chemical substance are as follows:

[0045] LiPF 6 (lithium hexafluorophosphate), LiFSI (lithium difluorosulfonyl imide), LiDFOB (lithium difluorooxalate borate), EC (ethylene carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), PP (propylene Propyl carbonate), DMC (dimethyl carbonate), PC (propylene carbonate), LiPO 2 f 2 (Lithium difluorophosphate), DTD (ethylene sulfate), o-TP (o-terphenyl), FBP (2-fluorobiphenyl), CHB (cyclohexylbenzene), BP (biphenyl), m-TP ( m-terphenyl), Tol (...

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PUM

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Abstract

The invention discloses a security lithium-ion power battery electrolyte and a lithium-ion power battery. The electrolyte comprises a non-aqueous organic solvent, a lithium salt, a low-impedance film-forming additive and an overcharge protection additive, wherein the low-impedance film-forming additive is at least one of lithium difluorophosphate and ethylene sulfate; and the overcharge protection additive is an aromatic or fluorinated aromatic compound containing a benzene ring. When the lithium-ion power battery is overcharged, the overcharge protection additive disclosed by the invention can be subjected to oxidation polymerization on the surface of an electrode or can be decomposed to produce a gas, so that the internal resistance of the battery is instantly increased, continuous charging for the battery is blocked and combustion and explosion of the battery are effectively avoided. Meanwhile, the low-impedance film-forming additive can form a stable SEI film on the surface of the electrode, side reaction of the overcharge protection additive and the electrode is inhibited and the internal resistance of the battery is reduced, so that the long cycle performance and the output characteristic of the power battery are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a safe lithium ion power battery electrolyte and a lithium ion power battery. Background technique [0002] Due to the advantages of high working voltage, high energy density, long life and environmental friendliness, lithium-ion batteries are widely used in 3C digital products, power tools, electric vehicles, aerospace and other fields. Especially in the field of electric vehicles, it has shown explosive growth since 2015. According to the national "Energy Saving and New Energy Automobile Industry Development Plan", the energy density of power batteries is required to reach more than 300Wh / Kg by 2020. [0003] As a means of transportation, electric vehicles are the focus of attention on their mileage, acceleration performance, climbing ability and safety performance. These aspects mainly depend on the performance of the power battery as a key component. In terms of lithium...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/056H01M10/0567H01M10/0566
CPCH01M10/0525H01M10/056H01M10/0566H01M10/0567Y02E60/10
Inventor 曾庆鹏吕家斌仰永军万华平潘立宁
Owner GUANGZHOU TINCI MATERIALS TECH
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