Electrolyte and lithium ion battery with same

An electrolyte and lithium salt technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problem of improving the oxidation of the positive electrode, so as to improve oxidation resistance, improve storage and cycle performance, and prevent dissolution Effect

Inactive Publication Date: 2016-11-09
HIGHPOWER TECH HUIZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the increase of voltage, the potential of the positive electrode increases and the oxidation of the positive electrode increases. Under high potential, the traditional electrolyte has been difficult to

Method used

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  • Electrolyte and lithium ion battery with same
  • Electrolyte and lithium ion battery with same
  • Electrolyte and lithium ion battery with same

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1:

[0025] (1) Preparation of electrolyte

[0026] According to the various materials and their addition amounts shown in Table 1, multiple sets of tests were carried out, and different quality fluorocarbonate, cyclohexanetrinitrile, adiponitrile, fluoroethylene carbonate, vinylene carbonate, The propane sultone and the lithium salt are dissolved in an organic solvent and mixed uniformly to obtain multiple sets of electrolytes. The addition amount in Table 1 refers to the mass fraction of each material in the total mass of the electrolyte. Wherein, the structural formula of the fluorocarbonate is Where R 1 , R 2 They are fluorine-containing alkyl groups at the end, and the organic solvents are ethylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, r-butyrolactone, methyl formate, and ethyl formate One or more of them. The lithium salt is lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsen...

Example Embodiment

[0047] Example 2:

[0048] Take a mixed solvent of ethylene carbonate: diethyl carbonate: ethyl methyl carbonate with a volume ratio of 1:1:1 as the organic solvent, and add lithium salt to it, the lithium salt is lithium hexafluorophosphate, and the concentration is 1.1 mol / L to obtain Electrolyte mother liquor. According to each material and its addition amount shown in Table 5, each material was added to the electrolyte mother liquor. The addition amount in the table is the mass fraction of each material in the total electrolyte mass to obtain electrolyte samples 1-6.

[0049] Table 5 Each material and its added amount

[0050]

[0051]

[0052] Take the unfilled batteries, respectively inject electrolyte samples 1-6, and then fully charge the finished batteries to 4.5V with 0.5C constant current and constant voltage, the current cut-off is 0.02C, and the batteries are placed in the glove Disassemble the box. The moisture and oxygen content in the glove box is ≤10ppm. After taki...

Example Embodiment

[0056] Example 3:

[0057] Dissolve fluorocarbonate, cyclohexanetrinitrile, adiponitrile, fluoroethylene carbonate, vinylene carbonate, propane sultone and lithium salt in an organic solvent and mix them evenly to obtain an electrolyte. The structural formula of the fluorocarbonate is Where R 1 for R 2 for The mass of the fluorocarbonate accounts for 0.1% of the total mass of the electrolyte, the mass of cyclohexanetrinitrile accounts for 10% of the total mass of the electrolyte, and the mass of fluoroethylene carbonate accounts for 0.1% of the total mass of the electrolyte. The mass of vinyl ester accounts for 3% of the total mass of the electrolyte, and the mass of propane sultone accounts for 0.1% of the total mass of the electrolyte. The organic solvent is a mixed solvent with a volume ratio of ethylene carbonate: diethyl carbonate: ethyl methyl carbonate of 1:1:1, and the lithium salt is lithium hexafluorophosphate with a concentration of 1.1 mol / L. The battery cell is p...

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Abstract

The invention discloses an electrolyte and a lithium ion battery with the same. On the basis of a traditional electrolyte, an additive system is improved optimally to develop a combined additive which comprises fluorocarbonate and cyclohexane tricarbonitrile, wherein the fluorocarbonate accounts for 0.1-10% of the total mass of the electrolyte, and the cyclohexane tricarbonitrile accounts for 0.1-10% of the total mass of the electrolyte. The cyclohexane tricarbonitrile is capable of effectively forming a complex on the surface of a cathode and effectively preventing dissolution of transition metal to further improve storage and cycle performances of a high-voltage battery cell; moreover, along with potential rise, oxidation resistance of a solvent and additives in the electrolyte is urgent in need of improvement, and the fluorocarbonate which is high in electrochemical window can improve oxidation resistance of the electrolyte. In conclusion, the electrolyte is capable of effectively improving performances of cycling, high-temperature storage, safety and the like of the lithium ion battery under a high voltage (4.40 V or above).

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an electrolyte and a lithium ion battery comprising the electrolyte. Background technique [0002] Lithium-ion batteries have the advantages of high open circuit voltage, large specific capacity, long cycle life, good safety performance, small self-discharge, wide application range, no memory effect, and no pollution. As a new type of green battery, it has been widely used in consumer electronics products, and is actively developing into the defense industry, space technology, electric vehicles and static backup power and other fields. With the widespread use of portable electronic products, especially in the field of civilian 3C consumer electronics such as smartphones and notebooks, the market has higher requirements for the service time of lithium-ion batteries, that is, the energy density of lithium-ion batteries. Therefore, the pursuit of high Performance energy d...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 陈启多于立娟秦雪英李掌权朱建平程君李文良
Owner HIGHPOWER TECH HUIZHOU
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