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Additive for lithium ion battery non-aqueous electrolyte and non-aqueous electrolyte made by the same

A non-aqueous electrolyte, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of difficulty in taking into account the performance of EC-based electrolytes, decreased battery safety performance, and reduced solvent ignition point, etc. Overcharge ability and flame retardancy, small effect of battery internal resistance, effect of inhibiting further decomposition

Inactive Publication Date: 2009-07-01
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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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. However, adding a large amount of low-viscosity chain carbonate will lead to a decrease in the ignition point of the solvent, and the safety performance of the battery will be greatly reduced.
Therefore, it is difficult to balance the performance of the above aspects of the EC-based electrolyte

Method used

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  • Additive for lithium ion battery non-aqueous electrolyte and non-aqueous electrolyte made by the same
  • Additive for lithium ion battery non-aqueous electrolyte and non-aqueous electrolyte made by the same
  • Additive for lithium ion battery non-aqueous electrolyte and non-aqueous electrolyte made by the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of phenyl-tris-2-methoxydiethoxysilane containing 10v / v% [C 6 h 5 Si(OCH 2 CH 2 OCH 2 CH 2 OCH 3 ) 3 ]. In an argon atmosphere glove box with a water content 6 Dissolved therein in an amount of 1.0 mol / L, a nonaqueous liquid electrolyte containing 10 v / v% of phenyl-tris-2-methoxydiethoxysilane was prepared.

[0029] Mix 90 parts by mass of artificial graphite CMS powder with 5 parts by mass of acetylene black, and 5 parts by mass of polyvinylidene fluoride PVDF plus N-methylpyrrolidone binder to form a uniform paste, which is evenly coated on the negative electrode On the copper foil of the current collector, vacuum-dry at 120°C for 12 hours, cut into electrode sheets of a certain size, as the working electrode, and use the lithium foil as the reference electrode and the counter electrode, in which there is phenyl-tri-2-methoxy Diethoxysilane non-aqueous liquid electrolyte and separator were assembled together into two simulated batteries3,4.

Embodiment 2

[0031]Preparation of vinyl-tris-2-methoxydiethoxysilane [CH 2 CHSi(OCH 2 CH 2 OCH 2 CH 2 OCH 3 ) 3 ] Non-aqueous liquid electrolyte and simulated battery 5,6. According to the method in Example 1, 5v / v% of vinyl-tri-2-methoxydiethoxysilane was mixed with propylene carbonate and dimethyl carbonate at a volume ratio of 1:1, and then Fully dry LiPF 6 Dissolved therein in an amount of 1.0 mol / L, a non-aqueous liquid electrolyte containing 5 v / v % of vinyl-tris-2-methoxydiethoxysilane was prepared. According to the method of Example 1, two simulated batteries 5 and 6 were assembled.

Embodiment 3

[0033] Tris-2-methoxyethoxy-2-thiocyanatoethylsilane [NCSCH 2 CH 2 Si(OCH 2 CH 2 OCH 3 ) 3 ] Non-aqueous liquid electrolyte. According to the method of Example 1, 3v / v% of tri-2-methoxyethoxy-2-thiocyanatoethylsilane was mixed with ethylene carbonate and dimethyl carbonate at a volume ratio of 1:1 Mix well, and then fully dry LiPF 6 Dissolved therein in an amount of 1.0 mol / L, a nonaqueous liquid electrolyte containing 3 v / v% of tris-2-methoxyethoxy-2-thiocyanatoethylsilane was prepared. According to the method of Example 1, two simulated batteries 7 and 8 were assembled.

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Abstract

The invention discloses an additive used in the nonaqueous electrolyte of a Li-ion battery for achieving good circle performance, safety performance and low-temperature performance of the Li-ion battery. The additive is a silane compound represented by formula (1): R1R2R3Si(OCH2CH2)nOCH3. The invention also discloses a nonaqueous electrolyte containing the additive. The nonaqueous electrolyte contains a Li salt, a nonaqueous organic solvent, and the silane compound represented by formula (1), wherein the silane compound accounts for 0.1 to 0.3 v / v% the nonaqueous organic solvent. The nonaqueous electrolyte in the Li-ion battery can form a dense and stable solid electrolyte interface membrane on the surface of negative electrodes, such as graphite so as to maximally suppress the decomposition of the electrolyte, thereby improving the charge / discharge efficiency and the circle property of the Li-ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an additive used in the nonaqueous electrolyte of the lithium ion battery and a nonaqueous electrolyte prepared by using the additive. Background technique [0002] Since Sony Corporation of Japan successfully developed lithium-ion batteries in 1990, lithium-ion batteries have been used in many electronic devices such as mobile phones, notebook computers, and digital cameras due to their high energy density, high specific power, good cycle performance, no memory effect, and no pollution. devices have been widely used. Recently, a series of progress has been made in the research and development of electric vehicle power batteries, which has further expanded the application field of lithium-ion batteries, and put forward higher requirements for lithium-ion battery cycle performance, safety performance and other aspects. [0003] In the early days, a series of studies were carr...

Claims

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Application Information

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IPC IPC(8): H01M10/40
CPCY02E60/122Y02E60/10
Inventor 夏琴王斌吴宇平熊鲲戴建才李霞
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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