Lithium ion battery non-aqueous electrolyte and lithium ion battery

A non-aqueous electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of insufficient high-temperature storage performance and high-temperature cycle performance

Active Publication Date: 2019-06-28
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of insufficient high-temperature storage performance and high-temperature cycle performance of existing lit

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

[0045] The preparation of fluorine-containing compound in compound A adopts corresponding carbonate and F 2 / N 2 After fluorination of the mixed gas, it can be purified by recrystallization or column chromatography. An example of its synthetic route is as follows:

[0046]

[0047] The cyano-containing compound in compound A is prepared by chlorinating the corresponding carbonate with sulfuryl chloride, then reacting with NaCN or KCN, and obtaining it through recrystallization or column chromatography purification. An example of its synthetic route is as follows:

[0048]

[0049] The trimethylsiloxy-containing compound in compound A is prepared by the substitution reaction between the corresponding hydroxycarbonate and nitrogen silane, and then purified by recrystallization or column chromatography. An example of its synthetic route is as follows:

[0050]

[0051] In some embodiments, the bicyclic sulfate compound is selected from compound B shown in structural fo...

Embodiment 1

[0076] 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:

[0077] The positive electrode preparation steps are: mix the positive electrode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 92:4:3 0.5 co 0.2 mn 0.3 o 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), dispersed in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry, which is evenly coated on the aluminum foil Both sides are dried, calendered and vacuum-dried, and aluminum lead-out wires are welded with an ultrasonic welder to obtain a positive plate, the thickness of which is between 120-150 μm.

[0078] Negative electrode preparation steps are: mix artificial graphite, conductive carbon black Super-P, binder styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) acc...

Embodiment 2～14

[0084] Embodiments 2 to 14 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:

[0085] Based on the total weight of the non-aqueous electrolytic solution as 100%, the non-aqueous electrolytic solution contains the components shown in the mass percentages of Examples 2 to 14 in Table 1.

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Abstract

In order to overcome the problems that a current lithium ion battery is poor in high-temperature storage performance and high-temperature cycle performance, the present invention provides a lithium ion battery non-aqueous electrolyte. The lithium ion battery non-aqueous electrolyte comprises a bicyclic sulfate compound and a compound A shown in a structural formula 1, in the formula 1, R3, R4, R5,R6, R7 and R8 are respectively selected from hydrogen atoms, fluorine atoms or a group containing 1-5 carbon atoms. The present invention further discloses a lithium ion battery comprising the lithium ion battery non-aqueous electrolyte. The lithium ion battery non-aqueous electrolyte facilitates improvement of the high-temperature storage and high-temperature cycle performances.

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 have made great progress in the field of portable electronic products because of their high operating voltage, high safety, long life and no memory effect. At the same time, with the development of new energy vehicles, lithium-ion batteries have great application prospects in power supply systems for new energy vehicles. [0003] In non-aqueous electrolyte lithium-ion batteries, the non-aqueous electrolyte is a key factor affecting the high and low temperature performance of the battery. In particular, the additives in the non-aqueous electrolyte are particularly important for the high and low temperature performance of the battery. During the initial charging process of the lithium-ion battery, the lithium ions in the positive el...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567Y02E60/10H01M10/0569H01M2300/0025
Inventor 胡时光石桥邓朝晖林雄贵
Owner SHENZHEN CAPCHEM TECH
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