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A kind of electrolyte and its application and product

An electrolyte and electrolyte additive technology, applied in organic electrolytes, non-aqueous electrolytes, circuits, etc., can solve the problems of low coulombic efficiency, reduced cycle life and high reactivity of batteries, and achieve obvious effects, improve stability, raw materials cheap effect

Active Publication Date: 2021-02-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In traditional lithium-ion batteries, the negative electrode uses commercial graphite, which has a limited theoretical specific capacity (372mAh / g). Compared with commercial graphite, metallic lithium has a higher specific energy and is the most potential replacement A metal electrode of graphite negative electrode; however, lithium metal is prone to serious lithium dendrite problems due to the uneven deposition of lithium during the cycle; on the other hand, lithium metal is susceptible to Oxygen, moisture, and electrolyte attacks cause practical problems such as low battery Coulombic efficiency and reduced cycle life

Method used

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  • A kind of electrolyte and its application and product
  • A kind of electrolyte and its application and product
  • A kind of electrolyte and its application and product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 (comparative example)

[0042] Dissolve 2.87g of bistrifluoromethanesulfonylimide lithium salt in 10mL of dimethyl sulfoxide electrolyte, and stir at room temperature for 12 hours to obtain 1.0mol L -1 of electrolyte. The obtained electrolyte solution was injected into a lithium-lithium symmetric battery to obtain the lithium-lithium symmetric battery of this pair of embodiments.

[0043] Test the lithium-lithium battery under the condition of oxygen saturation, after standing for 6 hours, carry out the charge and discharge test on the LAND-CT2001A tester, 0.25mA cm -2 The current density was charged and discharged for 2 h, respectively.

[0044] After 40 hours of cycling, the polarization of the battery fluctuated greatly, until after 100 hours, the battery was short-circuited and the battery was terminated.

Embodiment 2

[0046] The formula of the electrolyte solution proposed by the present invention: first dissolve 0.0123g of boric acid solid in 10mL of dimethyl sulfoxide solvent, then add 2.87g of lithium bistrifluoromethanesulfonimide, stir at room temperature for 12h, and obtain the concentration of boric acid 0.02mol L -1 , the lithium salt concentration is 1.0mol L -1 of electrolyte.

[0047] The obtained electrolyte solution was injected into a lithium-lithium battery to obtain the lithium-lithium battery of this pair of examples.

[0048] Test the lithium-lithium battery under the condition of oxygen saturation, after standing for 6 hours, carry out the charge and discharge test on the LAND-CT2001A tester, at 0.25mA cm -2 The current density was charged and discharged for 2h, respectively. After stable cycling for 880h, the polarization of the battery is still below 0.08V.

[0049] Such as figure 2 as shown, figure 2 The time-voltage curve comparison diagram of the electrolyte ...

Embodiment 3

[0051] The method identical with embodiment 2 is prepared to contain 0.02mol L -1 boric acid, 1.0mol L -1 The electrolyte solution of lithium salt is injected into the lithium-lithium battery to obtain the lithium-lithium battery of this pair of embodiments.

[0052] Test the lithium-lithium battery under the condition of oxygen saturation, after standing for 6 hours, carry out the charge and discharge test on the LAND-CT2001A tester, 0.5mA cm -2 current density, capacity limit 0.5mAh cm -2 . After a stable cycle of 500h, the voltage polarization was stable below 0.10V, and the electrolyte without boric acid additives only cycled for 48h under the same conditions.

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Abstract

The invention belongs to the field of secondary batteries. The invention relates to an electrolyte and its application and products. The additive in the electrolyte is boric acid (BA), phenylboronic acid or benzene rings containing methoxy and methyl substituted benzene One of the base boronic acids. This type of additive can form a dense SEI film on the surface of metal lithium, and can effectively inhibit the decomposition of lithium dendrites, oxygen and electrolyte on the surface of metal lithium. In addition, when the electrolyte is applied to metal lithium batteries and lithium oxygen batteries, the stability of metal lithium can be significantly improved under oxygen conditions, and the cycle performance can be greatly improved.

Description

technical field [0001] The invention belongs to the field of secondary batteries, and in particular relates to an electrolyte and a metal lithium battery using the electrolyte. Background technique [0002] Since the first lithium-ion battery produced by Sony Corporation of Japan in 1990, lithium-ion batteries have set off a wave of commercialization at home and abroad. In recent years, lithium-ion batteries have been widely used in various consumer electronic products, partially replacing traditional Fossil fuels have played an important role in solving the energy crisis and environmental protection issues. However, the electrode materials used in commercial lithium-ion batteries have limited theoretical specific capacity and energy density, which cannot meet the growing demand for high energy density. Therefore, it is of great significance to develop lithium metal batteries with high energy density, as well as lithium oxygen batteries and lithium sulfur batteries. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 沈越黄志梅黄云辉
Owner HUAZHONG UNIV OF SCI & TECH