A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve hidden dangers, high and low temperature safety problems, etc., and achieve the effects of preventing expansion, widening the liquid temperature range, and reducing the amount of gas

Active Publication Date: 2011-12-14
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of high and low temperature problems and potential safety hazards in the electrolyte composed of organic solvents and lithium salts in the prior art, and to provide a battery with good low-temperature discharge and high-temperature storage performance and flame-retardant or non-combustible properties. lithium-ion battery electrolyte

Method used

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  • A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte
  • A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte
  • A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte

Examples

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Effect test

Embodiment 1

[0041] This example is used to illustrate the electrolyte solution provided by the present invention.

[0042] (1) Preparation of ionic liquid

[0043] Under the protection of nitrogen, with 30 ml of acetonitrile as solvent, 20.4 g of N-methylpiperidine and 28.2 g of bromobutane were refluxed at 70°C for 4 hours, filtered, and vacuum-dried at 50°C for 5 hours to obtain N- Methyl-N-butylpiperidinium bromide. Take 30.0 grams of the obtained N-methyl-N-butylpiperidine bromide and 24.6 grams of lithium bisoxalate borate at room temperature for 3 hours, after liquid separation and evaporation of the solvent, vacuum dry at 90 ° C for 10 hours to obtain N - Bisoxalate borate of methyl-N-butylpiperidine (PP14BOB).

[0044] The obtained ionic liquid was separated and purified by silica gel column chromatography, and then stored in a glove box. figure 1 is the FTIR image of the obtained PP14BOB, where the wavenumber is 1275cm -1 The peak is the stretching vibration peak of the B-O s...

Embodiment 2

[0048] This example is used to illustrate the electrolyte solution provided by the present invention.

[0049] (1) Preparation of ionic liquid

[0050] Prepare the bisoxalate borate (Py13BOB) of N-methyl-N-propylpyrrole according to the same method as in Example 1 step (1), except that 17.5 grams of N-methylpyrrole replaces 20.4 gram of N-methylpiperidine, 25.3 grams of bromopropane instead of 28.2 grams of bromobutane.

[0051] (2) Preparation of electrolyte

[0052] At room temperature, in a glove box, Py13BOB, propylene carbonate, and ethyl methyl carbonate were mixed in a weight ratio of 30:35:35, and then LiPF was added to it 6 The electrolyte is formulated into an electrolyte solution with a concentration of 0.6 mol / liter. The prepared electrolyte sample is denoted as A2.

Embodiment 3

[0054] This example is used to illustrate the electrolyte solution provided by the present invention.

[0055] (1) Preparation of ionic liquid

[0056] Prepare trimethylpropylammonium dioxalate borate (N1113BOB) in the same manner as in Example 1 step (1), except that 12.1 grams of trimethylamine replace 20.4 grams of N-methylpiperine Pyridine, 25.3 grams of bromopropane instead of 28.2 grams of bromobutane.

[0057] (2) Preparation of electrolyte

[0058] At room temperature, in a glove box, N1113BOB, propylene carbonate, and ethyl methyl carbonate were mixed in a weight ratio of 50:25:25, and then LiPF was added to it 6 The electrolyte is formulated into an electrolyte solution with a concentration of 1.5 mol / liter. The prepared electrolyte sample is denoted as A3.

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Abstract

A Li-ion battery electrolyte contains lithium salt, ionic liquid and a non-aqueous solvent, wherein the anion contained in the ionic liquid is showed by formula (1). A Li-ion battery comprises an electrical core and the above electrolyte, which can retard combustion of organic solvents. The Li-ion battery using the electrolyte can suppress capacity fade at low temperature, and can reduce the amount of gas generated by the electrolyte at high temperature, thereby effectively preventing battery expansion and improving the high-temperature performance of the battery.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] In lithium-ion batteries, lithium metal and carbon materials can be used as negative electrode materials. When lithium metal is used as the negative electrode material, it can provide large capacity and high output voltage. The currently used electrolyte is mainly composed of organic solvents and lithium salts, and this electrolyte is prone to chemical reactions with lithium metal, resulting in uneven passivation of the lithium metal surface, resulting in dendrites during charging and discharging, making the battery invalid. Moreover, organic solvents are flammable and explosive, and there are potential safety hazards. [0003] In addition, the conventional electrolytic solution composed of organic solvent and lithium salt is a binary or ternary electrolytic solution based on EC (ethyl carbonate). During the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40
CPCY02E60/122Y02E60/10
Inventor 王岩
Owner BYD CO LTD
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