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Flame-retardant microsphere electrolyte and preparation method thereof

An electrolyte and microsphere technology, which is applied in the field of flame-retardant microsphere electrolyte and its preparation, can solve the problems of loss of initial capacity and poor cycle performance of standard electrolytes, and achieve the goal of preventing battery combustion, avoiding adverse effects, and broad application prospects Effect

Inactive Publication Date: 2020-04-10
SHANGHAI AEROSPACE POWER TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Standard electrolyte cycle performance is poor, losing approximately 50% of initial capacity in the first 50 cycles

Method used

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  • Flame-retardant microsphere electrolyte and preparation method thereof
  • Flame-retardant microsphere electrolyte and preparation method thereof
  • Flame-retardant microsphere electrolyte and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Preparation of TPP@PVDF-HFP core-shell microspheres: TPP and PVDF-HFP were mixed and dissolved at a ratio of 1:1 (w / w) in a mixed solution of dimethylacetamide and acetone (3:7, w / w), the concentration after dissolution was 16 wt%. Afterwards, a high voltage of 9kV, an injection speed of 1.0ml / h and a receiving distance of 25cm were used to obtain 50-100nm size core-shell structure microspheres TPP@PVDF-HFP by electrostatic spraying technology.

[0039] (2) Preparation of TPP@PVDF-HFP flame retardant electrolyte: firstly dissolve 2% wt TPP@PVDF-HFP in 1.0mol / L LiPF 6 / EC+DMC (1:1wt%) ordinary electrolyte, add 0.2%wt dispersant MF to make flame retardant electrolyte.

Embodiment 2

[0041] Preparation of TPP@PVDF-HFP core-shell microspheres: TPP and PVDF-HFP were mixed and dissolved in a mixed solution of dimethylacetamide and acetone (4:6w / w) at a ratio of 3:2 (w / w), The concentration after dissolution was 20 wt%. After that, 150-200nm core-shell structure microspheres TPP@PVDF-HFP were obtained by electrostatic spraying technology with a high voltage of 12kV, an injection speed of 2.0ml / h and a receiving distance of 20cm.

[0042] Preparation of TPP@PVDF-HFP flame retardant electrolyte: Firstly, 4% wt TPP@PVDF-HFP was dissolved in 1.2mol / LLiPF 6 / EC+DEC (1.2: 1wt%) ordinary electrolyte, add 0.4%wt dispersant MF to make a flame retardant electrolyte.

Embodiment 3

[0044] Preparation of TPP@PVDF-HFP core-shell microspheres: TPP and PVDF-HFP were mixed and dissolved in a mixed solution of dimethylacetamide and acetone (5:5) at a ratio of 2:3, and the dissolved concentration was 25wt% . After that, 250-300nm core-shell structure microspheres TPP@PVDF-HFP were obtained by electrostatic spraying technology with a high voltage of 16kV, an injection speed of 4.0ml / h and a receiving distance of 15cm.

[0045] Preparation of TPP@PVDF-HFP flame retardant electrolyte: Firstly, 5%wt TPP@PVDF-HFP was dissolved in 1.1mol / L LiPF 6 / EC+DMC+DEC (1:1:1wt%) ordinary electrolyte, add 0.5% wt5040 dispersant to make flame retardant electrolyte.

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Abstract

The invention discloses a flame-retardant microsphere electrolyte and a preparation method thereof. The electrolyte comprises core-shell microspheres, a dispersing agent and an electrolyte, the core-shell microspheres are composed of an inner core flame retardant TPP and a packaging shell PVDF-HFP, wherein the mass ratio of the core-shell microspheres in the electrolyte is 2%-10%, the dispersing agent is one or more of sodium methylene dimethyl naphthalene sulfonate, 2-naphthalene sulfonic acid formaldehyde polymer sodium salt and a polyacrylic acid copolymer, and the mass ratio of the dispersing agent in the electrolyte is 0.1%-3.0%. According to the flame-retardant microsphere electrolyte disclosed in the invention, the core-shell structure TPP(at)PVDF-HFP flame-retardant microspheres are added into the electrolyte in combination with a microcapsule technology and a flame-retardant technology, so that the battery combustion can be prevented fundamentally, the adverse effect on the electrochemical performance of the battery due to direct addition of a flame retardant is avoided, and the core-shell structure TPP(at)PVDF-HFP flame-retardant microspheres have a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of battery electrolyte, more specifically, to a flame-retardant microsphere electrolyte and a preparation method thereof. Background technique [0002] In order to realize the large-scale promotion of electric vehicles, improving the energy density of power batteries has become the most important research direction in the world. Improving the energy density of the battery can not only increase the cruising range, but also reduce the cost of the battery and prolong the service life. However, from another point of view, the substantial increase in the energy density of power batteries has led to an increase in the energy that can be released in a concentrated manner. Once the battery explodes, the greater the energy released, the higher the risk. Therefore, the safety problem of lithium-ion batteries is the biggest obstacle restricting the development of large-scale batteries and high specific energy. [000...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/42H01M10/0525
CPCH01M10/0566H01M10/4235H01M10/0525H01M2300/0025Y02E60/10
Inventor 廖喻星白雪君那伟王刚庆宋晓波钱培权蒋新华
Owner SHANGHAI AEROSPACE POWER TECH
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