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Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion battery electrolyte and lithium-ion batteries, can solve the problems of lithium dendrites and other problems, improve cycle stability and safety, meet high rate, and improve cycle life Effect

Active Publication Date: 2021-04-13
吴翠云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to: provide a kind of lithium ion electrolytic solution, to solve the existing lithium ion battery electrolytic solution to the voltage of lithium ion battery and suppress lithium dendrite under the large rate, high power charging and discharging unsatisfactory technology question

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 18

[0046] Embodiment 1 to Embodiment 18 respectively provide an electrolyte solution for a lithium-ion battery. The basic components contained in each embodiment lithium-ion battery electrolyte are as follows:

[0047] The mass ratio of ethylene carbonate (EC), ethyl propionate (EP), propyl propionate (PP), and propylene carbonate (PC) EC:PC:EP:PP=1:1:2:6, 0.5wt %VC, 1.5wt% FEC, 3%wt PS, 1.0%wt ADN, 1.0%wt SN, 15.0wt% lithium hexafluorophosphate (LiPF 6 ).

Embodiment 19～22

[0049] Embodiment 19 to Embodiment 22 respectively provide an electrolyte solution for a lithium-ion battery. The basic components contained in each embodiment lithium-ion battery electrolyte are as follows:

[0050] The mass ratio of ethylene carbonate (EC), ethyl propionate (EP), propyl propionate (PP), and propylene carbonate (PC) EC:PC:EP:PP=1:1:2:6, 0.5wt %VC, 1.5wt% FEC, 3%wt PS, 1.0%wt ADN, 1.0%wt SN, lithium hexafluorophosphate (LiPF 6 ), lithium hexafluoroarsenate (LiAsF 6 ); among them, LiPF 6 with LiAsF 6 The weight ratio is 1:0.1, LiPF 6 with LiAsF 6 The total mass accounts for 15.0wt% of the total mass of the electrolyte.

Embodiment 23～24

[0052] Embodiment 23 to Embodiment 24 respectively provide an electrolyte solution for a lithium-ion battery. The basic components contained in each embodiment lithium-ion battery electrolyte are as follows:

[0053] The mass ratio of ethylene carbonate (EC), ethyl propionate (EP), propyl propionate (PP), and propylene carbonate (PC) EC:PC:EP:PP=1:1:2:6, 0.5wt %VC, 1.5wt% FEC, 3%wt PS, 1.0%wt ADN, 1.0%wt SN, lithium hexafluorophosphate (LiPF 6 ), lithium nitrate (LiNO 3 ); among them, LiPF 6 with LiNO 3 The weight ratio is 1:0.1, LiPF 6with LiNO 3 The total mass accounts for 15.0wt% of the total mass of the electrolyte.

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Abstract

The present invention provides a lithium ion battery electrolyte which comprises a solvent, a lithium salt and an additive, the lithium salt and the additive are dissolved in the solvent, the solvent is a non-aqueous organic solvent, and the additive comprises at least two secondary carboxylic acid salts. Compared with the prior art, the electrolyte disclosed by the invention has the advantages that at least two types of secondary carboxylate are added into the electrolyte, so that a synergistic interaction effect can be achieved between salt additives or between the salt additives and lithium salt, and the electrolyte for the lithium ion battery is effectively endowed with a relatively wide working voltage range; the electrolyte is endowed with excellent chemical stability in high-rate charging and discharging and high-power charging and discharging states, the cycle requirements of high rate, high power and high temperature are met, the cycle stability and safety of the lithium ion battery are effectively improved, and the direct-current impedance of the lithium ion battery is effectively reduced.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] Compared with other batteries, lithium-ion batteries have the advantages of light weight, small size, high working voltage, high energy density, high output power, high charging efficiency, no memory effect, long cycle life, etc., not only in mobile phones, notebook computers and other fields It has been widely used, and is also considered to be one of the best choices for electric vehicles and large energy storage devices. [0003] With the gradual improvement of people's living requirements and the continuous development of electronic products. While the energy density of lithium-ion batteries is getting higher and higher, the safety and cycle performance of lithium-ion batteries are also constantly improving. For example, for drone lithium-ion batteries, car batteries, electric tool ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0569H01M10/0525H01M2300/0025Y02E60/10
Inventor 吴翠云刘伟
Owner 吴翠云