Lithium electrolyte of solvent self-sacrifice in-situ protection electrode, preparation and application thereof

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: 2021-12-10
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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  • Lithium electrolyte of solvent self-sacrifice in-situ protection electrode, preparation and application thereof
  • Lithium electrolyte of solvent self-sacrifice in-situ protection electrode, preparation and application thereof
  • Lithium electrolyte of solvent self-sacrifice in-situ protection electrode, preparation and application thereof

Examples

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Effect test

Embodiment 1

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

[0059] ① Solvent mixing: Weigh DMC and MMA as the main solvent according to the ratio in Table 1, and put FEC and TFEB as the fluorinated solvent into a stainless steel tank container, place the container in a propeller stirrer and stir at 400r / min for 1min to obtain the solvent A; where DMC:MMA=1:2 by volume ratio, FEC:TFEB=1:4;

[0060] ② Lithium salt mixing: weigh LATP and LiPF according to the ratio in Table 1 6 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 0.5%, ultrasonic treatment for 30min to obtain Solvent A of lithium salt; by mass ratio LATP: LiPF 6 =1:23

[0061] ③ Self-sacrifice inducer mixing: Weigh AIBN and TTE as the self-sacrifice inducer a...

Embodiment 2

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

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

[0068] ② Lithium salt mixing: weigh LLZTO, LiDOFB, LiPF according to the ratio in Table 1 6 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 30 minutes to obtain Solvent A of lithium salt;

[0069] ③ Self-sacrifice inducer mixing: Weigh VC and BPO as the self-sacrifice inducer according to the ratio in Table 1, and add them to the solvent A c...

Embodiment 3

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

[0075] ①Solvent mixing: Weigh EMC and EA as the main solvent according to the ratio in Table 1, and put TFEB and TFPC as the fluorinated solvent into a corundum tank container, place the container in a turbo stirrer and stir at 600r / min for 1min to obtain solvent A ;

[0076] ② Lithium salt mixing: weigh LiDOFB and LiBF according to the ratio in Table 1 4 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 10 minutes to obtain Solvent A of lithium salt;

[0077] ③ Self-sacrifice inducer mixing: weigh SL and MF according to the ratio in Table 1 3 As a self-sacrificing inducer, add it to the lithium salt-containing solvent A ob...

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Abstract

The invention relates to the field of lithium battery electrolytic solutions, in particular to a lithium electrolyte of a solvent self-sacrifice in-situ protection electrode, preparation and application thereof. The lithium electrolyte is composed of a solvent and a lithium salt, wherein the concentration of the lithium salt is 0.9 mol/L-7 mol/L, the solvent comprises the following components in percentage by mass: 18-49% of a fluorinated solvent, 0.5-9.9% of a self-sacrifice inducer and 55-90% of a main solvent, the electrolyte is used for manufacturing a lithium battery, and the addition amount is that the ratio of the mass of the electrolyte to the designed capacity is not more than 2.4 g/Ah. According to the invention, the lithium secondary battery with the weight of 500 Wh/kg can be prepared by adopting the electrolyte disclosed by the invention, and extremely high engineering application value is achieved.

Description

technical field [0001] The invention relates to the field of lithium-based battery electrolytes, in particular to a lithium-based electrolyte for self-sacrificing in-situ protection electrodes by solvents, as well as its preparation and application. Background technique [0002] The ever-increasing energy consumption in modern society has led to the demand 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 greater reversible capacity and compatibility with higher voltage charging has always been a hot research topic, with the aim of breaking through the shackles of the specific energy of secondary batteries of 500Wh / kg, such as the famous American Battery500 project. [0003] LiCoO was first c...

Claims

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Application Information

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Patent Type & Authority Applications(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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