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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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
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Example Embodiment

[0022] Example 1

[0023] (1) Preparation of electrolyte:

[0024] In an argon atmosphere, the electrolyte is prepared in a vacuum glove box with a moisture content of 6 , PS, lithium difluorophosphate and bicyclic phosphoric anhydride compounds. Among them, ethylene carbonate / ethyl methyl carbonate / diethyl carbonate=2 / 5 / 3 (mass ratio), LiPF 6 The concentration of the 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 is compound 1, and the bicyclic phosphoric anhydride compound 1 The content of 1% of the total mass of the electrolyte is uniformly mixed to obtain the electrolyte of the present invention.

[0025] (2) Preparation of positive pole piece: LiNi, a ternary material of nickel cobalt manganese oxide 0.5 Mn 0.3 Co 0.2 O 2 , Adhesive PVDF and conductive agent SuperP are mixed uniformly according to the mass r...

Example

[0028] Examples 2-9

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

Example Embodiment

[0030] Example 10

[0031] The preparation of the lithium ion battery in Example 10 is the same as that in Example 5, except that: the electrolyte of Example 10 uses 1-propyl phosphoric anhydride, while the electrolyte of Example 5 uses 1,3-propane sulfonic acid. For lactones, see Table 1 for specific components and content.

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PUM

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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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