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Lithium ion battery with nickel-based cathode, and electrolyte therefor

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low solubility, low concentration and conductivity, poor low-temperature performance electrolyte system, etc., to improve high-temperature performance, low-temperature The effect of excellent performance and good high temperature performance

Active Publication Date: 2013-07-17
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solubility of lithium bisoxalate borate in carbonate solvent is small, and its low concentration and conductivity cannot meet the requirements of industrialization and increasing energy density; and its low temperature performance is better than that of LiPF 6 Poor electrolyte system for lithium salt

Method used

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  • Lithium ion battery with nickel-based cathode, and electrolyte therefor
  • Lithium ion battery with nickel-based cathode, and electrolyte therefor
  • Lithium ion battery with nickel-based cathode, and electrolyte therefor

Examples

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Effect test

Embodiment 1

[0042] Example 1, The electrolyte solution for a nickel-based cathode lithium-ion battery provided in this embodiment includes a non-aqueous organic solvent, a lithium salt and a non-lithium salt additive, and also includes a boron-containing lithium salt additive, a cyclic ether compound and a cyclophosphazene compound, Among them, the non-aqueous organic solvent is a mixture of ethylene carbonate, diethyl carbonate and propylene carbonate (1:2:1 volume ratio), and the non-lithium salt additives are vinyl sulfite and fluoroethylene carbonate. The mass percentages of those accounting for the total mass of the electrolyte are 2% and 3%, and the lithium salt is LiPF 6 (molar concentration is 1mol / L), the boron-containing lithium salt additive is LiBOB, and its concentration is 0.1mol / L, and the cyclic phosphazene compound is a cyclic phosphazene derivative represented by the following chemical formula (VIII):

[0043]

[0044] The cyclic phosphazene derivative accounts for 2...

Embodiment 2

[0045] Example 2, The electrolyte solution for a nickel-based cathode lithium-ion battery provided in this embodiment includes a non-aqueous organic solvent, a lithium salt and a non-lithium salt additive, and also includes a boron-containing lithium salt additive, a cyclic ether compound and a cyclophosphazene compound, Among them, the non-aqueous organic solvent is a mixture of propylene carbonate, dimethyl carbonate and ethyl methyl carbonate (volume ratio 1:2:1), and the non-lithium salt additives are fluoroethylene carbonate, 1,3-propanesulfonate Lactone, the mass percentage of the two accounts for the total mass of the electrolyte is 1% and 2%, and the lithium salt is LiPF 6 (molar concentration is 1mol / L), the boron-containing lithium salt additive is LiBF 4 , and its concentration is 0.3mol / L, and the cyclophosphazene compound is a cyclophosphazene derivative represented by the following chemical formula (IV):

[0046]

[0047] The cyclic phosphazene derivative a...

Embodiment 3

[0048] Example 3, The electrolyte solution for a nickel-based cathode lithium-ion battery provided in this embodiment includes a non-aqueous organic solvent, a lithium salt and a non-lithium salt additive, and also includes a boron-containing lithium salt additive, a cyclic ether compound and a cyclophosphazene compound, Among them, the non-aqueous organic solvent is a mixture of propylene carbonate, dimethyl carbonate and ethyl methyl carbonate (volume ratio 1:2:1), and the non-lithium salt additives are fluoroethylene carbonate and acetonitrile. The mass percentage of the total liquid mass is 3% and 5%, and the lithium salt is LiPF 6 (molar concentration is 1mol / L), the boron-containing lithium salt additive is LiDFOB, and its concentration is 0.5mol / L, and the cyclic phosphazene compound is a cyclic phosphazene derivative represented by the following chemical formula (IX):

[0049]

[0050] The cyclic phosphazene derivative accounts for 6% by mass of the total mass of ...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to electrolyte for a lithium ion battery with a nickel-based cathode. The electrolyte comprises non-aqueous organic solvent, lithium salt, boron-containing lithium salt additive, cyclic ether compound and cyclic phosphonitrile compound. The cyclic phosphonitrile compound is hexaphenoxycyclotriphosphazene or cyclic phosphonitrile derivative. Compared with the prior art, the electrolyte is provided with the boron-containing lithium salt additive capable of improving high temperature performance of the lithium ion secondary battery with nickel-based cathode material, the cyclic phosphonitrile compound, and the cyclic ether compound, and the addition of the cyclic phosphonitrile compound and the cyclic ether compound enables the battery to be fine in high temperature performance, low temperature performance and cycle performance. In addition, the invention discloses the lithium ion battery comprising the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolytic solution for a nickel-based cathode lithium ion battery and a lithium ion battery containing the electrolytic solution. Background technique [0002] In recent years, the rapid development of electronic products has promoted the rapid growth of lithium-ion batteries, and also put forward higher energy density requirements for lithium-ion batteries, and also requires lithium-ion batteries to be able to work normally in harsh environments, such as in It can charge and discharge normally under high temperature (-80°C) and low temperature (-20°C) environments. [0003] Lithium-ion batteries containing nickel-based cathode materials have the advantages of large capacity, high voltage platform, and good safety. However, the existing electrolyte system is difficult to fully meet the industrial application of lithium-ion batteries using nickel-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 钟松材胡念姜玲燕张耀
Owner DONGGUAN AMPEREX TECH
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