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Application of metal nitride, electrolyte containing metal nitride and application of electrolyte in secondary battery

A secondary battery, sodium secondary battery technology, applied in the direction of secondary battery, secondary battery repair/maintenance, organic electrolyte, etc., can solve the problems of few cycles, poor stability, low Coulombic efficiency, etc., and achieve Coulombic efficiency The effect of improving, prolonging the number of cycles, and suppressing lithium dendrites

Active Publication Date: 2019-08-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the electrolytes with mature technology, such as: carbonates and ether solvents and their corresponding lithium salts, have no significant effect on the protection of metal lithium, and all have problems such as poor stability, low Coulombic efficiency, and few cycles.

Method used

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  • Application of metal nitride, electrolyte containing metal nitride and application of electrolyte in secondary battery
  • Application of metal nitride, electrolyte containing metal nitride and application of electrolyte in secondary battery
  • Application of metal nitride, electrolyte containing metal nitride and application of electrolyte in secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0058] In the above electrolyte 1M LiTFSI / DOL:DME (1:1Vol%), add 0.5wt.%Mg 3 N 2 As an additive, the electrolyte assembled battery without adding magnesium nitride is used as a comparison sample, and the cycle life and Coulombic efficiency graph at 0.5C rate ( figure 1 ). Cycle at 0.5C with addition of Mg 3 N 2 The battery performance of the electrolyte is significantly better than that of the control sample, and after 60 cycles, the control sample begins to decline significantly, while the battery containing the additive can still continue to cycle stably up to 120 cycles. The addition of nitrides has obvious beneficial effects.

Embodiment 2

[0060] In the above electrolyte 1M LiTFSI / DOL:DME (1:1Vol%), add 1Wt.% AlN as an additive, and use the electrolyte assembled battery without adding magnesium nitride as a comparison sample, the cycle life and Coulombic efficiency diagram ( figure 2 ). The battery assembled with the electrolyte added with AlN can be cycled stably for 90 cycles, while the cycle capacity of the control battery keeps decreasing and cannot continue to cycle stably. The effect of nitride addition is obvious.

Embodiment 3

[0062] Add mass fractions of 0.3% and 0.5% Mg to the above electrolyte 1M LiTFSI / DOL:DME (1:1Vol%) 3 N 2 , after assembling the half-cell, at a charge density of 1mA / cm 2 , the power is 1mAh / cm 2 The next cycle, see the results image 3 . Add Mg 3 N 2 The beneficial effect of 0.5% of the electrolyte on the half-cell can reach more than 130 cycles, the beneficial effect of the electrolyte added at 0.3% on the half-cell can reach about 90 cycles, and the addition of different amounts of Mg 3 N 2 Both are significantly improved compared to the non-additive half-cell. But the effect of adding more than 0.5% is better.

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PUM

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Abstract

The invention discloses a metal lithium and metal sodium secondary battery electrolyte additive and application thereof. The electrolyte additive of the present invention includes one or more metal nitrides. The growth of lithium dendrites of lithium metal or sodium during charging can be effectively inhibited. The operation of the present invention is simple, and a corresponding electrolyte solution is prepared by adding the metal nitrides to the electrolyte. During the charging and discharging processes of the battery, the nitrides in the electrolyte chemically reacts with a lithium metal sheet or a sodium metal sheet to form a corresponding metal and lithium nitride or sodium nitride, an in-situ SEI film is formed on the surface of metal lithium, the generation of the lithium dendritescan be effectively avoided, and therefore, the charge and discharge coulombic efficiency and cycle life of a lithium metal negative electrode are improved.

Description

technical field [0001] The invention belongs to the field of secondary battery materials, and in particular relates to an electrolyte additive for inhibiting lithium dendrites. Background technique [0002] Lithium metal has very broad application prospects, especially its high theoretical specific capacity (3860mAh / g), the lowest electrode potential (-3.040V vs. SHE) and low density (0.53g / cm 3 ), which has significant advantages in battery materials. However, in the application process, the growth of its dendrites has been unavoidable. During the charging process, lithium ions are reduced to metallic lithium. During the reduction process, the reaction is affected by the subtle differences on the surface of the pole piece, and uneven deposition of metallic lithium occurs. When the uneven deposition continues to accumulate, it becomes lithium dendrites. The continuous growth of dendrites causes the internal diaphragm of the battery to be pierced, causing a short circuit of...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/054H01M10/42
CPCH01M10/0525H01M10/054H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 洪波赖延清董庆元覃昭铭范海林段柏禹
Owner CENT SOUTH UNIV
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