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A kind of lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery, electrolyte technology, applied in the field of materials, can solve the problems that are not involved, and achieve the effect of improving the cycle

Active Publication Date: 2021-07-13
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application number is "201710978247.4", which discloses a lithium-ion battery electrolyte. In this invention, four kinds of additives are added to the electrolyte for combination. Additive A is fluoroethylene carbonate, 1,2-difluoroethylene carbonate Additive B is an organic ester compound containing phosphorus and / or boron, additive C is a lithium salt additive, and additive D is a nitrile compound with 2 to 3 nitrile functional groups, so that lithium ions The battery can solve the above problems without adding anti-overcharge additives. The power type lithium-ion battery electrolyte satisfies the power type battery electrolyte's ability to charge and discharge large currents in a wide temperature range, temperature rise control, high temperature storage and Requirements for anti-overcharge performance; but the above are not related to the types of additives in this patent, on the other hand, although the additives lithium difluorodismalonate phosphate and its derivatives and lithium tetrafluoromalonate phosphate and its derivatives It has been reported that it has a significant effect on improving the charge and discharge performance of 5V lithium-ion batteries, but whether the combination of other specific compounds, such as phenylboronic anhydride compounds, can be improved by improving the composition of positive and negative electrodes in lithium-ion batteries Membrane performance to improve the cycle, storage, high voltage, and rate performance of lithium-ion batteries, but has not been studied yet

Method used

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  • A kind of lithium ion battery electrolyte and lithium ion battery
  • A kind of lithium ion battery electrolyte and lithium ion battery
  • A kind of lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The non-aqueous organic solvents are ethylene carbonate, diethyl carbonate, ethyl methyl carbonate, and propylene carbonate, which respectively account for 29.5%, 20%, 25%, and 5% of the total mass of the electrolyte; the lithium salt is LiPF 6 , and the lithium salt accounts for 14.3% of the total mass fraction of the electrolyte; the additive lithium difluorooxalate borate accounts for 0.5% of the total mass of the electrolyte, and the additive lithium bisfluorosulfonyl imide accounts for 0.9% of the total mass of the electrolyte %, the additive is vinyl sulfate, the percentage of the total mass of the electrolyte is 2%, the additive is fluoroethylene carbonate, the percentage of the total mass of the electrolyte is 2%, and the additive 2,4-difluorobiphenyl accounts for the total mass of the electrolyte The percentage is 0.3%, the additive The percentage of the total mass of the electrolyte is 0.5%. And the electrolyte solution is denoted as S1.

Embodiment 2

[0051] The non-aqueous organic solvents are ethylene carbonate, diethyl carbonate, ethyl methyl carbonate, and propylene carbonate, which respectively account for 29%, 20%, 25%, and 5% of the total mass of the electrolyte; the lithium salt is LiPF 6 , and the lithium salt accounts for 14.3% of the total mass fraction of the electrolyte; the additive lithium difluorooxalate borate accounts for 0.5% of the total mass of the electrolyte, and the additive lithium bisfluorosulfonyl imide accounts for 0.9% of the total mass of the electrolyte %, the additive is vinyl sulfate, the percentage of the total mass of the electrolyte is 2%, the additive is fluoroethylene carbonate, the percentage of the total mass of the electrolyte is 2%, and the additive 2,4-difluorobiphenyl accounts for the total mass of the electrolyte The percentage is 0.3%, the additive The percentage of the total mass of the electrolyte is 0.5%, the additive The percentage of the total mass of the electrolyte is ...

Embodiment 3

[0053] The non-aqueous organic solvents are ethylene carbonate, diethyl carbonate, ethyl methyl carbonate, and propylene carbonate, which respectively account for 29%, 20%, 25%, and 5% of the total mass of the electrolyte; the lithium salt is LiPF 6 , and the lithium salt accounts for 14.3% of the total mass fraction of the electrolyte; the additive lithium difluorooxalate borate accounts for 0.5% of the total mass of the electrolyte, and the additive lithium bisfluorosulfonyl imide accounts for 0.9% of the total mass of the electrolyte %, the additive is vinyl sulfate, the percentage of the total mass of the electrolyte is 2%, the additive is fluoroethylene carbonate, the percentage of the total mass of the electrolyte is 2%, and the additive 2,4-difluorobiphenyl accounts for the total mass of the electrolyte The percentage is 0.3%, the additive The percentage of the total mass of the electrolyte is 0.5%, the additive The percentage of the total mass of the electrolyte is ...

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Abstract

The invention relates to a lithium ion battery electrolyte, including an organic solvent, a lithium salt and an additive, the additive includes an additive A and an additive B, and the additive A is a fluorinated cyclic ester, an unsaturated cyclic carbonate, an unsaturated sulfuric acid ester, an unsaturated One or more of saturated sulfites and sultones; Additive B is lithium difluorobismalonate phosphate shown in structural formula (1) and its derivatives and / or tetrafluoroethylene phosphate shown in structural formula (2) Lithium fluoromalonate phosphate and its derivatives; wherein, Rx, Ry, and Rz independently represent oxygen atoms. The present invention improves the cycle, storage, high voltage, and rate performance of lithium-ion batteries through the combined use of additives.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a lithium-ion battery electrolyte and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics, energy storage, and power batteries due to their advantages such as high specific energy, long cycle life, and low self-discharge. With the widespread application of lithium-ion batteries, their use environments have long tended to be diverse, and the performance requirements for batteries are getting higher and higher. On the one hand, with the development of portable electronic products in the direction of miniaturization and multi-function and the higher requirements of power batteries for cruising range, the energy density requirements of lithium-ion batteries are getting higher and higher. On the other hand, in the process of high-current discharge Rapidly realize the diffusion of lithium ions to reduce polar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 陈黎甘朝伦陈晓荣王婷婷
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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