Multivalent metal battery containing two-dimensional nanosheet additive

A two-dimensional nano, multivalent metal technology, applied in secondary batteries, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problem of losing control of metal deposition, and achieve high utilization of inhibiting the formation of loose and uneven metal deposition. , the effect of excellent cycle stability

Pending Publication Date: 2022-04-05
ZHEJIANG UNIV HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the electrodeposition process, this functional coating fixed on the current collector will be covered by the deposited metal, gradually losing control over the metal deposition

Method used

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  • Multivalent metal battery containing two-dimensional nanosheet additive
  • Multivalent metal battery containing two-dimensional nanosheet additive
  • Multivalent metal battery containing two-dimensional nanosheet additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Prepared with 2.0mol L -1 ZnSO 4 , 0.5mg mL -1 The electrolyte solution of carbon nitride two-dimensional nanosheets uses water as a solvent and ultrasonically disperses at 25°C for 1 hour until the dispersion is uniform to form a colloidal electrolyte.

[0038] The electrolyte is used to use 100μm thick zinc metal foil as the negative electrode of the battery, and the surface capacity of the positive electrode is 1mAh cm -2 MnO 2 As the positive electrode, the glass fiber membrane is used as the diaphragm, and the constant current 1.0C is charged and discharged on the battery tester (Wuhan Landian Company), the Coulombic efficiency of the battery can reach 99.9%, and the cycle life is 1500 cycles.

[0039] figure 1 It is the scanning electron microscope zinc metal deposition map of the first lap deposition in the electrolyte of this embodiment. It can be found from observation that the zinc metal deposition is dense and orderly arranged by using the electrolyte of ...

Embodiment 2

[0046] Prepared with 2.0mol L -1 ZnSO 4 , 1.0mg mL -1 The electrolyte solution of carbon nitride two-dimensional nanosheets uses water as a solvent and ultrasonically disperses at 0°C for 2 hours until the dispersion is uniform to form a colloidal electrolyte.

[0047] The electrolyte is used to use 20μm thick zinc metal foil as the negative electrode of the battery, and the surface capacity of the positive electrode is 6mAh cm -2 Zn x V 2 o 5 nH 2 O is the positive electrode, the glass fiber membrane is used as the diaphragm, and the constant current 1.0C is charged and discharged on the battery tester (Wuhan Landian Company), the Coulombic efficiency of the battery can reach 99.9%, and the cycle life is 400 cycles.

Embodiment 3

[0051] The preparation process is basically the same as that of Example 2, the only difference being that boron nitride two-dimensional nanosheets are added to the electrolyte.

[0052] The assembly and testing of the battery are exactly the same as those in Example 2. After testing, the Coulombic efficiency is 99.5%, the cycle life is 225 cycles, and the internal short circuit of the battery occurs.

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Abstract

The invention discloses a multivalent metal battery containing a two-dimensional nanosheet additive, the multivalent metal battery comprises an electrolyte and a multivalent metal negative electrode, the electrolyte comprises an electrolyte salt, the two-dimensional nanosheet additive and a solvent; the two-dimensional nanosheet additive is selected from one or more of carbon nitride, boron nitride, nitrogen-doped graphene, sulfur-doped graphene and oxygen-doped graphene. By adding the two-dimensional nanosheet additive into the electrolyte, metal deposition can be continuously and orderly induced on an electrochemical interface to form a compact and ordered metal deposit, so that the electrochemical performance of a total battery based on polyvalent metal as a negative electrode is improved, and the cycle life of the total battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of secondary high energy density batteries, in particular to a multivalent metal battery containing two-dimensional nano sheet additives. Background technique [0002] With the rapid development of new energy technology industries such as portable electronic devices and electric vehicles, the global demand for energy storage devices with high energy density and high safety factor is increasing. Due to its high energy density (200~300Whkg -1 ) and good cycle life (1000-1500 cycles) have become one of the most important energy storage devices at present, but are limited by the scarce lithium source reserves (0.0065wt%) in the earth’s crust and the high flammability of electrode materials and organic electrolytes. characteristics, the large-scale and in-depth promotion and application of lithium batteries are limited. Zinc metal based on multiple electron transfer (Zn / Zn 2+ ), magnesium metal (Mg / Mg 2 + ) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/054H01M10/058H01M10/056H01M10/36
CPCY02E60/10Y02P70/50
Inventor 陆盈盈张魏栋范磊
Owner ZHEJIANG UNIV HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
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