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A kind of lithium-based electrolyte for solvent self-sacrifice in-situ protection electrode and its preparation and application

A technology for protecting electrodes and electrolytes, applied in electrolytes, non-aqueous electrolytes, non-aqueous electrolyte batteries, etc., can solve problems such as poor cycle stability of high-voltage electrochemical systems, reduce electrolyte consumption, increase specific energy, and increase specific energy Effect

Active Publication Date: 2022-06-17
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the current situation of poor cycle stability of the high-voltage electrochemical system, the present invention proposes an active sacrifice strategy, that is, a strategy of actively sacrificing a small part of the solvent when the lithium-based battery is charged for the first time, so as to generate more stable SEI and CEI on the surface of the positive and negative electrodes. So as to achieve the purpose of protecting the positive and negative electrodes in situ at the same time

Method used

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  • A kind of lithium-based electrolyte for solvent self-sacrifice in-situ protection electrode and its preparation and application
  • A kind of lithium-based electrolyte for solvent self-sacrifice in-situ protection electrode and its preparation and application
  • A kind of lithium-based electrolyte for solvent self-sacrifice in-situ protection electrode and its preparation and application

Examples

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Embodiment 1

[0058] A preparation method of a lithium-based electrolyte with a solvent self-sacrificing in-situ protection electrode is as follows:

[0059] ①Solvent mixing: Weigh DMC and MMA as main solvents according to the proportions in Table 1, FEC and TFEB are fluorinated solvents and put them into a stainless steel tank container. A; wherein DMC:MMA=1:2, FEC:TFEB=1:4 by volume ratio;

[0060] ②Lithium salt mixing: weigh LATP and LiPF according to the ratio in Table 1 6 It is a lithium salt, in the state where the solvent A described in step 1 has a stirring vortex, add lithium salt to the vortex, then seal the container and transfer it to an ultrasonic device in an environment with a relative humidity of 0.5%, and ultrasonically treat it for 30min. Solvent A for lithium salts; LATP:LiPF by mass 6 =1:23;

[0061] ③Mixing of self-sacrificing inducers: Weigh AIBN and TTE as self-sacrificing inducers according to the proportions in Table 1, add them to the lithium salt-containing sol...

Embodiment 2

[0066] A preparation method of a lithium-based electrolyte with a solvent self-sacrificing in-situ protection electrode is as follows:

[0067] ①Solvent mixing: Weigh EMC and EA as main solvents, TFEB and TFPC are fluorinated solvents and put them into a PTFE tank container according to the proportions in Table 1, and place the container in a magnetic stirrer and stir at 500 r / min for 1 min to obtain solvent A;

[0068] ②Lithium salt mixing: weigh LLZTO, LiDOFB, LiPF according to the proportions in Table 1 6 For lithium salt, in the state of stirring vortex in the solvent A described in step 1, add lithium salt to the vortex, then seal the container and transfer it to an ultrasonic device in an environment with a relative humidity of 1.0%, and ultrasonically treat it for 30min. Solvent A for lithium salt;

[0069] ③Mixing of self-sacrificial inducers: Weigh VC and BPO as self-sacrificial inducers according to the proportions in Table 1, add them to the lithium salt-containin...

Embodiment 3

[0074] A preparation method of a lithium-based electrolyte with a solvent self-sacrificing in-situ protection electrode is as follows:

[0075] ①Solvent mixing: Weigh EMC and EA as main solvents, TFEB and TFPC are fluorinated solvents and put them into a corundum tank container according to the proportions in Table 1, and place the container in a turbine mixer and stir at 600 r / min for 1 min to obtain Solvent A ;

[0076] ②Lithium salt mixing: weigh LiDOFB and LiBF according to the ratio in Table 1 4 For lithium salt, in the state of stirring vortex in the solvent A described in step 1, add lithium salt to the vortex, then seal the container and transfer it to an ultrasonic device in an environment with a relative humidity of 1.0%, and ultrasonically treat it for 10min to obtain a solution containing lithium salt. Solvent A for lithium salt;

[0077] ③Mixing of self-sacrifice inducers: weigh SL and MF according to the proportions in Table 1 3 As a self-sacrificing inducer, ...

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Abstract

The invention relates to the field of lithium-based battery electrolytes, in particular to a lithium-based electrolyte in which a solvent self-sacrifices in-situ protection electrodes and its preparation and application; the lithium-based electrolyte is composed of a solvent and a lithium salt, and the concentration of the lithium salt is 0.9mol / L ~7mol / L; the solvent is composed of the following components in terms of mass percentage: fluorinated solvent 18%~49%, self-sacrifice inducer 0.5%~9.9%, main solvent 55%~90%, the electrolyte is used for For the production of lithium-based batteries, the added amount is not more than 2.4g / Ah according to the ratio of the electrolyte mass to the designed capacity, and the invention can be used to prepare a 500Wh / kg lithium-based secondary battery, which has extremely high engineering application value.

Description

technical field [0001] The invention relates to the field of lithium-based battery electrolytes, in particular to a lithium-based electrolyte for solvent self-sacrificing in-situ protection electrodes, preparation and application thereof. Background technique [0002] The ever-increasing energy consumption of modern society has led to the need for higher energy density energy storage technologies. Lithium-ion batteries (LIBs) are the most popular energy storage devices, widely used in portable electronics, electric vehicles. The energy density of LIBs is proportional to the operating voltage and lithium storage capacity. Therefore, the development of cathode materials with larger reversible capacity and compatibility with higher voltage charging has always been a hot research topic, aiming to break through the 500Wh / kg specific energy shackles of secondary batteries, such as the famous US Battery500 program. [0003] LiCoO, which was first recognized as a promising cathode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M10/0563H01M10/0569
CPCH01M10/052H01M10/0563H01M10/0569H01M2300/0091H01M2300/0017Y02E60/10
Inventor 郭灏杨泽林石斌邹睿吴宁宁陈晓涛王建勇刘富亮
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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