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A nonaqueous electrolyte for lithium secondary battery

A non-aqueous electrolyte, lithium secondary battery technology, used in secondary batteries, circuits, electrical components, etc., can solve the problems of reduced solvent ignition point, reduced battery safety, poor low temperature performance of batteries, etc. The effect of suppressing further decomposition and increasing the internal resistance of the battery

Inactive Publication Date: 2006-10-25
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high melting point of EC, the low-temperature performance of the battery is poor, and it cannot work below -20°C
Generally speaking, low-viscosity solvents have a low boiling point. Although a large amount of addition is beneficial to the improvement of the performance of the electrolyte, there is also the problem that the solvent’s ignition point decreases and the safety of the battery decreases.
On the contrary, if the amount of addition is small, there will be a problem of poor low temperature performance of the battery
Therefore, it is difficult to balance the cycle characteristics, battery safety and low temperature characteristics of this type of battery at present.

Method used

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  • A nonaqueous electrolyte for lithium secondary battery
  • A nonaqueous electrolyte for lithium secondary battery
  • A nonaqueous electrolyte for lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, preparation contains the non-aqueous electrolyte of 0.1wt% tetrachlorethylene and simulation battery 1

[0028] In an argon atmosphere glove box with a water content of 6 Dissolved therein at an amount of 1 mol / L to prepare a non-aqueous electrolyte containing 0.1 wt % tetrachlorethylene.

[0029] The natural graphite powder of 90 parts by weight is mixed with the N-methylpyrrolidone binder solution of 10 parts by weight of PVDF (polyvinylidene fluoride) to form a uniform slurry, and evenly coated on the thickness of the negative electrode current collector On the 12μm copper foil, vacuum-dried at 120°C for 8 hours, cut into electrode sheets of a certain size, used as the cathode, and the lithium foil as the anode, with a separator impregnated with the prepared non-aqueous electrolyte in between to form a simulated battery 1 .

Embodiment 2～4

[0030] Embodiment 2~4, preparation contains the non-aqueous electrolyte of 3wt%, 5wt% and 10wt% perchlorethylene and simulation battery 2~4

[0031] According to the method of Example 1, 3wt%, 5wt% and 10wt% tetrachlorethylene were dissolved in propylene carbonate and LiPF respectively 6 Among them, non-aqueous electrolytes containing 3wt%, 5wt% and 10wt% tetrachlorethylene were prepared.

[0032] According to the method in Example 1, simulated batteries 2-4 were constructed.

Embodiment 5～8

[0033] Examples 5-8, preparation of non-aqueous electrolytes containing 0.1wt%, 3wt%, 5wt% and 10wt% tetrafluoroethylene and simulated batteries 5-8

[0034] According to the method of Example 1, 0.1wt%, 3wt%, 5wt% and 10wt% tetrafluoroethylene were dissolved in propylene carbonate and LiPF respectively 6 Among them, non-aqueous electrolytes containing 0.1wt%, 3wt%, 5wt% and 10wt% tetrafluoroethylene were prepared.

[0035] According to the method in Example 1, simulated batteries 5-8 were constructed.

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Abstract

The invention relates to a non-water electrolyte for lithium secondary cell, containing: (i) lithium salt; (ii) non-water organic solvent; (iii) an additive containing at least a halogen alkene compound which contains hydrogen, alkyl, cycloalkyl, thiazolinyl, aryl or halogen, as well as F, Cl, Br or I; the additive accounts for 0.1-10wt% of total weight of the non-water organic solvent. The invention uses the above additive before the decomposition of the organic solvent of the electrolyte and can form a layer of compact and stable solid electrolyte interface film on graphite cathode surface, thus furthest inhibiting the decomposition of the electrolyte and then improving the charge-discharge efficiency and circulating property of the lithium secondary cell.

Description

technical field [0001] The invention belongs to the field of high-energy batteries, in particular to nonaqueous electrolytes for lithium secondary batteries. technical background [0002] Since Japan's Sony Corporation successfully developed lithium-ion batteries in 1990, lithium-ion batteries have been widely used in mobile phones and cameras due to their excellent performance such as high working voltage (3.6V), high energy density, no memory effect, small self-discharge and long cycle life. , notebook computers and other portable electronic devices have been widely used. In recent years, the research and development of electric vehicle power batteries has gradually shifted to lithium secondary batteries with large capacity and high energy density. Furthermore, as the application field of lithium secondary batteries expands, further improvements in battery cycle characteristics and battery performance are highly expected. [0003] Although people have long regarded the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01B1/12
Inventor 胡勇胜孔维和陈立泉黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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