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Lithium ion battery non-aqueous electrolyte and lithium ion battery

A non-aqueous electrolyte, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of difficult to take into account the high and low temperature performance of the battery, and achieve the effect of improving high temperature storage and low temperature performance and good stability

Active Publication Date: 2020-01-07
SANMING HEXAFLUO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing electrolyte additives are difficult to take into account the high and low temperature performance of the battery, the present invention provides a non-aqueous electrolyte for a lithium ion battery and a lithium ion battery

Method used

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  • Lithium ion battery non-aqueous electrolyte and lithium ion battery
  • Lithium ion battery non-aqueous electrolyte and lithium ion battery
  • Lithium ion battery non-aqueous electrolyte and lithium ion battery

Examples

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preparation example Construction

[0049] The preparation method of polymer 1~6 in the table 1 is: be dissolved in the organic solvent by a plurality of vinylene carbonates (VC), add the initiator (dibenzoyl peroxide BPO, dibenzoyl peroxide BPO, Azobisisobutyronitrile AIBN, n-butyllithium, etc.), placed under heat or light to initiate polymerization for 2-24 hours, to obtain a homopolymer composed of multiple structural units A, hydrolyze part of the structure under alkaline conditions The cyclic carbonate of unit A obtains hydroxyl-containing polyvinylene carbonate, through adding hexamethyldisilazane; acrylonitrile; trifluoroacetic anhydride; dimethyl sulfate; hexamethyldisilazane+sulfuric acid Dimethyl ester; hexamethyldisilazane+trifluoroacetic anhydride reacts with hydroxyl, and finally purifies by sedimentation or column chromatography to obtain a polymer additive including structural unit A and structural unit B.

[0050] The synthetic route of polymer 1~6 in table 1 is as follows:

[0051]

[0052] ...

Embodiment 1

[0069] This embodiment is used to illustrate the lithium-ion battery non-aqueous electrolyte, lithium-ion battery and preparation method thereof disclosed in the present invention, comprising the following steps:

[0070] 1) Preparation of non-aqueous electrolyte:

[0071] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, taking the total weight of the non-aqueous electrolytic solution as 100%, adding the components shown in the mass percent in Example 1 in Table 2.

[0072] 2) Preparation of positive plate:

[0073] Mix the positive electrode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.5 co 0.2 mn 0.3 o 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain pos...

Embodiment 2～15

[0082] Embodiments 2 to 15 are used to illustrate the lithium ion battery non-aqueous electrolyte, lithium ion battery and preparation method thereof disclosed in the present invention, including most of the operating steps in Example 1, the difference being:

[0083] In the preparation step of described non-aqueous electrolytic solution:

[0084] Based on the total mass of the non-aqueous electrolytic solution as 100%, the non-aqueous electrolytic solution is added with the components shown in the mass percentages in Example 2 to Example 15 in Table 2.

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Abstract

The invention provides a lithium ion battery non-aqueous electrolyte. The invention aims to solve the problem that an existing electrolyte additive has little possibility of balancing the high-temperature and low-temperature performance of a battery. The lithium ion battery non-aqueous electrolyte of the invention a solvent, lithium salt and a polymer additive; the polymer additive comprises at least one structural unit A and at least one of a structural unit B1 and a structural unit B2, wherein the structural unit A, the structural unit B1 and the structural unit B2 are orderly or disorderlyarranged; and R, R1 and R2 in the molecular structures of the structural unit A, the structural unit B1 and the structural unit B2 are independently selected from functional groups containing 1-5 carbon atoms. The invention also discloses a lithium ion battery comprising the non-aqueous electrolyte. The non-aqueous electrolyte provided by the invention can effectively improve the high-temperatureand low-temperature cycle performance of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery non-aqueous electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in the field of 3C consumer electronics because of their high energy density and high power, long cycle life and high safety, wide operating temperature range and no memory effect. With countries vigorously advocating new energy and low-carbon economy, and with the rapid growth of electric vehicles and energy storage equipment in the future, lithium-ion batteries have great application prospects. [0003] In the non-aqueous electrolyte lithium-ion battery, the non-aqueous electrolyte plays the role of transporting and conducting current between the positive and negative electrodes, and is the key factor determining the high and low temperature performance of the battery. Additives can significantly improve performa...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 曹朝伟陈群石桥胡时光熊得军黄佳豪
Owner SANMING HEXAFLUO CHEM CO LTD