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Electrolyte for inhibiting lithium dendrites and preparation method thereof, and lithium battery

An electrolyte and lithium dendrite technology, which is applied in the field of electrolyte and preparation for inhibiting lithium dendrites, and can solve the problem that the inhibition effect of lithium dendrites is not obvious.

Inactive Publication Date: 2017-10-20
东莞市航盛新能源材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the role of nano-additives is mainly to inhibit the problem of lithium metal dendrites by participating in the formation of negative electrode SEI. These nano-additives usually gradually fail after repeated cycles. Such nano-additives with a single effect cannot solve the problem of lithium metal negative electrodes very well. dendrite problem
Therefore, we propose a non-aqueous electrolyte in which nano-fluoride is used as a nano-additive with multiple inhibitory effects on the lithium metal anode dendrite problem. The mechanism of this system is to use the multiple effects of fluoride nanoparticles to suppress the lithium metal anode The growth effect of dendrites, thus effectively solving the problem that the inhibitory effect of nano-additives on lithium dendrites is not obvious

Method used

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  • Electrolyte for inhibiting lithium dendrites and preparation method thereof, and lithium battery
  • Electrolyte for inhibiting lithium dendrites and preparation method thereof, and lithium battery
  • Electrolyte for inhibiting lithium dendrites and preparation method thereof, and lithium battery

Examples

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Effect test

Embodiment 1

[0058] An electrolyte solution for inhibiting lithium dendrites, comprising lithium salts, nano-additives, and organic solvents, the concentration of the lithium salt is 1mol / L, the mass fraction of the nano-additives is 0.1%, and the mass fraction of the dispersant is 0.1%.

[0059] Wherein, the nano-additive is LiF; the dispersant is CMC; the organic solvent is composed of 1,3-dioxolane (DOL) and ethylene glycol dimethyl ether (DME) in a volume ratio of 1:1 Composition; the lithium salt is lithium bis(fluorosulfonyl)imide (LiFSI).

[0060] The preparation method includes the following steps: (1) dissolving the lithium salt in an organic solvent to form a lithium salt solution; (2) adding other raw materials to the lithium salt solution, and ultrasonically dispersing at 25°C for 2 hours to obtain the electrolyte .

[0061] (2) Installation of Li丨Li symmetrical battery: the specification of the battery case used is 2032. Install in the order of positive electrode case-lithi...

Embodiment 2

[0067] An electrolyte solution for inhibiting lithium dendrites, comprising lithium salts, nano-additives, and organic solvents, the concentration of the lithium salt is 1mol / L, the mass fraction of the nano-additives is 1%, and the mass fraction of the dispersant is 0.1%.

[0068] Wherein, the nano-additive is CsF; the dispersant is CMC; the organic solvent is composed of 1,3-dioxolane (DOL) and ethylene glycol dimethyl ether (DME) in a volume ratio of 1:1 Composition; The lithium salt is lithium hexafluorophosphate (LiPF 6 ).

[0069] The preparation method includes the following steps: (1) dissolving the lithium salt in an organic solvent to form a lithium salt solution; (2) adding other raw materials to the lithium salt solution, and ultrasonically dispersing at 25°C for 2 hours to obtain the electrolyte .

Embodiment 3

[0082] An electrolyte solution for inhibiting lithium dendrites, comprising lithium salts, nano-additives, and organic solvents, the concentration of the lithium salt is 10mol / L, the mass fraction of the nano-additives is 0.01%, and the mass fraction of the dispersant is 0.01%.

[0083] Wherein, the nano-additive is made of AlF 3 , NaF, MgF 2 Composition by weight ratio of 1:1:1; the dispersant is PEG; the organic solvent is composed of DMC, DEC, EC by volume ratio of 1:1:1; the lithium salt is LiPF 6 , LiClO 4 、LiBF 4 、LiBF 3 Cl is composed in a ratio of 1:1:1:1 by weight.

[0084] The preparation method includes the following steps: (1) dissolving the lithium salt in an organic solvent to form a lithium salt solution; (2) adding other raw materials to the lithium salt solution, and ultrasonically dispersing at 0°C for 48 hours to obtain the electrolyte .

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Abstract

The invention specifically relates to an electrolyte for inhibiting lithium dendrites and a preparation method thereof, and a lithium battery, belonging to the technical field of lithium batteries. The electrolyte comprises a lithium salt, a nanometer additive, a dispersant and an organic solvent, wherein the concentration of the lithium salt is 0.5 to 10 mol / L, and the mass percent of the nanometer additive is 0.01 to 10%. The nonaqueous electrolyte prepared with fluoride-containing nanoparticles as the nanometer additive enables the battery to have better stability and security and longer service life; the fluoride-containing electrolyte has continuous and stable effect in the battery; compared with traditional film-forming nanometer additives, the fluoride-containing nanoparticles achieves the effect of on-site rapid film formation on the surface of a negative electrode, so the growth of lithium dendrites and side reactions on the surface of a positive electrode are effectively inhibited; moreover, the fluoride-containing nanoparticles stably exist in the electrolyte and is free of problems like decline in effect.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an electrolyte for suppressing lithium dendrites, a preparation method and a lithium battery. Background technique [0002] With the development of science and technology, human's demand for energy is increasing day by day, and commercial lithium-ion batteries can no longer meet the demand due to their low theoretical specific capacity. The development of high-capacity-density batteries has become a research hotspot. Lithium metal has a high theoretical specific capacity. (3860mAh / g), has great application potential in the field of energy storage, but the growth of lithium dendrites not only reduces the performance of the battery, but also is prone to short-circuits and cause safety hazards. These problems have seriously hindered the development of metal lithium negative secondary batteries development and practical application. [0003] Solving the above problems main...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 谢科予田秀丽沈超刘小艳何叶黄继宏
Owner 东莞市航盛新能源材料有限公司
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