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Lithium ion battery electrolyte and lithium ion battery containing the same

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

Active Publication Date: 2009-07-01
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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  • Lithium ion battery electrolyte and lithium ion battery containing the same
  • Lithium ion battery electrolyte and lithium ion battery containing the same
  • Lithium ion battery electrolyte and lithium ion battery containing the same

Examples

Experimental program
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Effect test

Embodiment 1

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

[0042] (1) Preparation of ionic liquid

[0043] Under the protection of nitrogen, using 30 ml of acetonitrile as the 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-butylpiperidine bromide. Take 30.0 g of the prepared N-methyl-N-butylpiperidine bromide and 24.6 g of lithium bisoxalate borate to react for 3 hours at room temperature. After liquid separation, evaporation of the solvent, vacuum drying at 90°C for 10 hours to obtain N -Methyl-N-butylpiperidine bisoxalic acid borate (PP14BOB).

[0044] After the obtained ionic liquid is separated and purified by silica gel column chromatography, it is stored in a glove box. figure 1 Is the FTIR diagram of PP14BOB obtained, where the wave number is 1275cm -1 The peak of is the stretching vibration peak of the B-O single bo...

Embodiment 2

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

[0049] (1) Preparation of ionic liquid

[0050] Prepare N-methyl-N-propylpyrrole bisoxalic acid borate (Py13BOB) according to the same method as in Example 1 step (1), except that 17.5 g of N-methylpyrrole is used instead of 20.4 Grams 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, mix Py13BOB, propylene carbonate, and ethyl methyl carbonate in a weight ratio of 30:35:35, and then add LiPF to it 6 The electrolyte is formulated into an electrolyte solution with a concentration of 0.6 mol / liter. The prepared electrolyte sample is referred to as A2.

Embodiment 3

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

[0055] (1) Preparation of ionic liquid

[0056] Prepare trimethylpropylammonium bisoxalic acid borate (N1113BOB) according to the same method as in Example 1 step (1), except that 12.1 g of trimethylamine is used instead of 20.4 g of N-methylpiperidine 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, mix N1113BOB, propylene carbonate, and ethyl methyl carbonate at a weight ratio of 50:25:25, and then add LiPF to it 6 The electrolyte is formulated into an electrolyte solution with a concentration of 1.5 mol / liter. The prepared electrolyte sample is referred to 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 anode materials. When lithium metal is used as the anode material, it can provide large capacity and high output voltage. The electrolytes currently used are mainly composed of organic solvents and lithium salts, and this electrolyte is prone to chemical reactions with lithium metal, causing uneven passivation on the surface of lithium metal, resulting in dendrite phenomenon during charging and discharging, making the battery failure. In addition, organic solvents are flammable and explosive, which poses safety risks. [0003] In addition, the conventional electrolyte composed of an organic solvent and a lithium salt is an electrolyte of a binary or ternary system based on EC (ethyl carbonate). During the first charge of the battery, EC can b...

Claims

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Application Information

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