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Carbonic ester electrolyte additive and application thereof

A technology of electrolyte additives and carbonates, applied in the directions of organic electrolytes, non-aqueous electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of complicated operation, limited practical application, high cost, etc., and achieves a simple formula and is conducive to large batches. Production, the effect of improving cycle life

Active Publication Date: 2021-10-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are complex and costly, which limits their practical application.

Method used

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  • Carbonic ester electrolyte additive and application thereof
  • Carbonic ester electrolyte additive and application thereof
  • Carbonic ester electrolyte additive and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) The reference electrolyte 1M LiPF 6 EMC / FEC (7 / 3, volume ratio) is transferred to a glass bottle, and then the additive 2-fluorophenylsulfur pentafluoride of the present invention that accounts for 5wt.% of the reference electrolyte is added in the glass bottle, and it is stirred overnight to form a uniform liquid electrolyte.

[0039] 2) Take the electrolyte in 1), and then assemble Li / / Cu half cells and Li / / Li symmetrical cells as examples.

[0040] At the same time, as a comparison, a lithium metal battery assembled with a reference electrolyte without additives was used as a comparative example, and other operations were the same as above.

[0041] Test results such as figure 1 As shown, there are a large number of needle-like lithium dendrites and loose and porous lithium metal in the comparative example, indicating that the lithium deposition is not uniform under the electrolyte system in the comparative example. In the electrolyte of the embodiment, the su...

Embodiment 2

[0044] 1) The reference electrolyte 1M LiPF 6 EMC / FEC (7 / 3, volume ratio) is transferred to the glass bottle, and then the additive 4-fluorophenyl sulfur pentafluoride of the present invention accounting for 5wt.% of the reference electrolyte is added in the glass bottle, and it is stirred overnight to form a uniform liquid electrolyte.

[0045] 2) Take the electrolyte in 1), and then assemble a Li / / LCO full battery as an example.

[0046] At the same time, as a comparison, a Li / / LCO full battery assembled with a reference electrolyte without additives was used as a comparative example, and other operations were the same as above.

[0047] Test results such as image 3 As shown, under the condition of current density of 0.2C, the first-cycle coulombic efficiency of the Li / / LCO full battery of the embodiment is 96.38%, and the first-cycle discharge capacity is 210.8mAh g -1 , far superior to the comparative example.

Embodiment 3

[0049] 1) The reference electrolyte 1M LiPF 6 EMC / FEC (7 / 3, volume ratio) is transferred to a glass bottle, and then the additive 2-fluorophenylsulfur pentafluoride of the present invention that accounts for 1wt.% of the reference electrolyte is added in the glass bottle, and it is stirred overnight to form a uniform liquid electrolyte.

[0050] 2) Take the electrolyte in 1), and then assemble Li / / Cu half cells and Li / / Li symmetrical cells as examples.

[0051] At the same time, as a comparison, a lithium metal battery assembled with a reference electrolyte without additives was used as a comparative example, and other operations were the same as above.

[0052] Test result: at 1mAcm -2 and 1mAh cm -2 Under these conditions, the average coulombic efficiency of the Li / / Cu battery of the embodiment after 300 cycles is 96.23%, which is far better than that of the comparative example. at 1 mA cm -2 and 1mAh cm -2 Under the conditions, the Li / / Li symmetric battery of the emb...

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Abstract

The invention provides a carbonic ester electrolyte additive and application thereof. The additive is phenyl sulfur pentafluoride and isomer or derivative thereof. The invention also provides a carbonic ester electrolyte containing the additive and a lithium metal total battery. The electrolyte additive can effectively guide ordered deposition of Li < + > and reduce nucleation overpotential and polarization, so that growth of lithium dendrites is inhibited, a flat and smooth lithium metal surface is obtained, and short circuit is avoided.

Description

technical field [0001] The invention relates to a carbonate electrolyte additive and its application, belonging to the technical field of lithium metal batteries. Background technique [0002] Lithium metal batteries (LMBs) refer to batteries that use metallic lithium as the negative electrode, and the matching positive electrode materials can be oxygen, elemental sulfur, metal oxides and other substances. Lithium metal batteries are one of the most promising next-generation high-energy-density storage devices capable of meeting the stringent requirements of emerging industries. Carbonate electrolytes have a wide voltage window and can be used as electrolytes for lithium metal batteries. However, uncontrolled side reactions of Li metal in carbonate electrolytes cause low Coulombic efficiency and dendrite growth, leading to unstable cycling and battery short circuits. [0003] At present, the methods for improving lithium metal anodes mainly include constructing various lit...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/0567H01M10/052H01M2300/0025Y02E60/10
Inventor 郑明森范镜敏董全峰崔学阳
Owner XIAMEN UNIV
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