An electrolyte and a lithium ion battery

An electrolyte and lithium salt technology, applied in the field of electrolyte and lithium-ion batteries, can solve the problems of increased battery impedance, heating of the battery cell, strong oxidation of the electrolyte, etc., and achieve the effect of good ion conductivity and low viscosity

Active Publication Date: 2017-11-17
NINGDE AMPEREX TECH
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Problems solved by technology

The current commercial lithium-ion battery electrolyte is mainly based on carbonate-based organic solvents. When the voltage is higher than 4.5V, the electrolyte will be strongly oxidized, resulting in deterioration of battery performance.
In order to adapt to highly oxidative positive electrode materials, adding positive electrode passivation additives to reduce the oxidation activity of the positive electrode surface is still the main method at present, but the use of passivating additives will inevitably lead to increased battery impedance, poor kinetic performance and high rate discharge. The problem of battery heating

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  • An electrolyte and a lithium ion battery
  • An electrolyte and a lithium ion battery
  • An electrolyte and a lithium ion battery

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Embodiment Construction

[0011] The electrolyte solution and the lithium ion battery according to the present invention will be described in detail below.

[0012] First, the electrolytic solution according to the first aspect of the present invention will be described.

[0013] The electrolytic solution according to the first aspect of the present invention includes a lithium salt and an organic solvent. The lithium salt includes: LiPF 6 and lithium bis(trifluoromethanesulfonyl)imide (abbreviated as LiTFSI) and / or lithium bis(fluorosulfonyl)imide (abbreviated as LiFSI). The organic solvent includes: carboxylate and / or fluorocarboxylate; carbonate and / or fluorocarbonate; and sulfone. The room temperature viscosity of the carboxylate is 0.3mPa.s-0.5mPa.s. The room temperature viscosity of the fluorocarboxylate is less than 0.3mPa.s. Neither the carboxylate nor the fluorocarboxylate has a boiling point lower than 65°C under normal pressure. The weight of the carboxylate and / or the fluorocarboxylate...

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Abstract

An electrolyte and a lithium ion battery are provided. The electrolyte includes lithium salts and an organic solvent. The lithium salts include LiPF6 and LiTFSI and/or LiFSI. The organic solvent includes carboxylate and/or fluorinated carboxylate, carbonate and/or fluorinated carbonate, and sulphone. The room-temperature viscosity of the carboxylate is 0.3-0.5 mPa.s. The room-temperature viscosity of the fluorinated carboxylate is less than 0.3 mPa.s. The boiling points under atmospheric pressure of the carboxylate and the fluorinated carboxylate are not lower than 65 DEG C. The weight of the carboxylate and/or the fluorinated carboxylate is 5-30% of the total weight of the organic solvent. The electrolyte has characteristics of low viscosity, good ionic conductivity and resistance to high voltages. The electrolyte can be applied for lithium ion batteries the working voltages of which are 4.5 V or above.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to an electrolyte and a lithium ion battery. Background technique [0002] With the development of the battery industry, in order to solve the problem of battery life, both consumer electronics and power batteries have put forward higher requirements on the energy density of batteries. In order to adapt to the development trend of smaller and lighter batteries, it is particularly important to use battery cathode materials with both high voltage and large capacity. Battery cathode materials currently in the stage of large-scale application such as LiCoO 2 , LiMn 2 o 4 and LiFePO 4 The operating voltage is lower than 4.5V, with LiNi 0.5 mn 1.5 o 4 and LiCoPO 4 The discharge voltage of the high-voltage positive electrode materials represented by such as can be as high as about 5V. These high-voltage positive electrode materials can be used in lithium-ion batteries to improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0568H01M10/0569Y02E60/10
Inventor 湛英杰颜剑
Owner NINGDE AMPEREX TECH
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