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Electrolytic solution and lithium ion battery using same

An electrolyte and lithium salt technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems affecting the storage performance and cycle performance of lithium-ion batteries, and achieve guaranteed performance, high ionic conductivity, and high thermodynamics. The effect of stability

Inactive Publication Date: 2020-07-03
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the heterocyclic compound undergoes electropolymerization, it will generate hydrogen ions, and the excess hydrogen ions will be combined with LiFP 6 Continuously react with the SEI film generated by the negative electrode, thereby affecting the storage performance and cycle performance of lithium-ion batteries

Method used

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  • Electrolytic solution and lithium ion battery using same
  • Electrolytic solution and lithium ion battery using same
  • Electrolytic solution and lithium ion battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of electrolyte:

[0024] Under argon atmosphere, the electrolyte solution is prepared in a vacuum glove box with a moisture content of 6 , PS, lithium difluorophosphate and bicyclic phosphoric anhydride compounds. Wherein, ethylene carbonate / ethyl methyl carbonate / diethyl carbonate=2 / 5 / 3 (mass ratio), LiPF 6 The concentration of lithium salt is 1.0mol / L, the content of PS is 2% of the total weight of the electrolyte, the content of lithium difluorophosphate is 1% of the total weight of the electrolyte, the bicyclic phosphoric anhydride compound uses compound 1, and the bicyclic phosphoric anhydride compound 1 The content accounts for 1% of the total mass of the electrolyte, and is mixed uniformly to obtain the electrolyte of the present invention.

[0025] (2) Preparation of the positive electrode sheet: the nickel-cobalt lithium manganate ternary material LiNi 0.5 mn 0.3 co 0.2 o 2 , the binder PVDF and the conductive agent SuperP are mixed uniform...

Embodiment 2～9

[0029] The preparation of lithium-ion batteries in Examples 2-9 is the same as in Example 1, the difference is that different bicyclic phosphoric anhydride compounds are used in the electrolytes of each example, and the corresponding bicyclic phosphoric anhydride compounds 2-9 are used in Examples 2-9. , while Example 1 uses bicyclic phosphoric anhydride compound 1, and the specific components and contents are shown in Table 1.

Embodiment 10

[0031] The preparation of the lithium-ion battery in Example 10 is the same as in Example 5, the difference being that 1-propyl phosphoric anhydride is used in the electrolyte of Example 10, and 1,3-propanesulfonic acid is used in the electrolyte of Example 5 Lactone, the specific components and content are shown in Table 1.

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Abstract

The invention provides an electrolytic solution, which comprises a non-aqueous organic solvent, a lithium salt and an additive, wherein the additive comprises a bicyclic phosphoric anhydride compound,the structural formula of the bicyclic phosphoric anhydride compound is defined in the specification, and R1-R8 are independently selected from one or more of a fluorine atom, an alkoxy group, an alkenyloxy group, a ynyloxy group, an aryl group, a nitrile group and a saturated or unsaturated alkyl group with a carbon atom of 1-10. According to the invention, a bicyclic phosphoric anhydride compound is introduced into the electrolytic solution disclosed by the invention, so that a compact solid-state interface film can be formed on the surface of a positive electrode active material, has highthermodynamic stability and ionic conductivity, and can protect an electrolytic solution from being oxidized and decomposed even in high-temperature, high-voltage and deteriorated environments so as to ensure the performance providing of a lithium ion battery and improve the high-temperature storage and cycle performance of the lithium ion battery. The invention also provides a lithium ion batteryprepared from the electrolytic solution.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] Lithium-ion batteries have significant advantages such as high specific energy, high specific power, long cycle life, and small self-discharge. They have been widely used in electronic products such as mobile communications, digital cameras, and video cameras, and have become a hot spot in the development of energy storage and power batteries. . In order to increase the energy density of lithium-ion batteries, developing high-voltage lithium-ion batteries is one of the effective methods. At present, lithium-ion batteries with an operating voltage above 4.35V have become a research hotspot for many scientific research institutes and enterprises. However, under high voltage, the oxidation activity of the positive electrode becomes higher, and the non-aqueous electrolyte eas...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 黄秋洁王霹霹毛冲欧霜辉白晶梁洪耀戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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