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Method for preparing lithium metal battery negative electrode supported by carbon/tin composite substrate

A technology for lithium metal batteries and composite substrates, which is applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve problems such as the inability to solve lithium volume changes, and achieve inhibiting the formation of dendrites, high specific surface area, and good lithophilicity. Effect

Inactive Publication Date: 2019-10-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods cannot solve the difficult problem of volume change of lithium.

Method used

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  • Method for preparing lithium metal battery negative electrode supported by carbon/tin composite substrate
  • Method for preparing lithium metal battery negative electrode supported by carbon/tin composite substrate
  • Method for preparing lithium metal battery negative electrode supported by carbon/tin composite substrate

Examples

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Effect test

Embodiment 1

[0021] This embodiment includes the following steps:

[0022] Step 1: Weigh 0.108g of potassium stannate and 0.675g of urea in a mixed solution of 15mL of water and 15mL of ethanol. After stirring evenly, add the solution into the hydrothermal reaction kettle, and then add 3 pieces of commercial Carbon cloth, heated at 180°C for 18 hours, after the reaction, the product was washed 3 times with deionized water and dried;

[0023] The second step: calcinate the product obtained in the first step at 600 ° C for 2 hours in an inert atmosphere furnace, and the heating rate is 5 ° C min -1 , the reaction is completed, after the obtained carbon / tin composite support material is cooled to normal temperature, the product is transferred to a vacuum environment;

[0024] Step 3: Melt the commercial lithium sheet at 300°C under vacuum conditions, and then soak the composite support material in the molten lithium metal to complete the loading. The obtained product is the negative electrod...

Embodiment 2

[0027] This embodiment includes the following steps:

[0028] Step 1: Weigh 0.216g of potassium stannate and 1.675g of urea in a mixed solution of 20mL of water and 20mL of ethanol. After stirring evenly, add the solution into the hydrothermal reaction kettle, and then add 3 pieces of commercial Carbon cloth, heated at 180°C for 24 hours, after the reaction, the product was washed 3 times with deionized water and dried;

[0029] The second step: calcinate the product obtained in the first step at 600 ° C for 2 hours in an inert atmosphere furnace, and the heating rate is 5 ° C min -1 , the reaction is completed, after the obtained carbon / tin composite support material is cooled to normal temperature, the product is transferred to a vacuum environment;

[0030] Step 3: Melt the commercial lithium sheet at 300°C under vacuum conditions, and then soak the composite support material in the molten lithium metal to complete the loading. The obtained product is the negative electrod...

Embodiment 3

[0033] This embodiment includes the following steps:

[0034] Step 1: Weigh 0.5g of potassium stannate and 3g of urea in a mixed solution of 40mL of water and 40mL of ethanol. After stirring evenly, add the solution into the hydrothermal reaction kettle, and then add 4 pieces of commercial carbon with a diameter of 10mm. cloth, heated at 240°C for 24 hours, after the reaction, the product was washed 5 times with deionized water and dried;

[0035] The second step: calcinate the product obtained in the first step at 600 ° C for 2 hours in an inert atmosphere furnace, and the heating rate is 5 ° C min -1 , the reaction is completed, after the obtained carbon / tin composite support material is cooled to normal temperature, the product is transferred to a vacuum environment;

[0036] Step 3: Melt the commercial lithium sheet at 350°C under vacuum conditions, and then infiltrate the composite support material in the molten lithium metal to complete the loading. The resulting produc...

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Abstract

The invention provides a method for preparing a lithium metal battery negative electrode supported by a carbon / tin composite substrate. The method comprises the steps of loading tin oxide on a commercial carbon cloth by adopting a hydrothermal reaction, then heating under an inert gas protection condition, performing in-situ formation of metal tin on the surface of the carbon cloth, finally loading heated molten metal lithium on the composite substrate with the metal tin as a lithiophilicity site to obtain an improved lithium negative electrode. The method is characterized in that: the doubleaffinity of the metal tin to the carbon cloth and the metal lithium is used, the defects such as dendrite growth during the cycle of the negative electrode of the metal lithium battery are improved, and the lithium metal battery negative electrode with high cycle stability, high battery capacity and low non-reactive energy consumption is prepared.

Description

technical field [0001] The invention relates to the preparation of negative electrode materials for batteries, in particular to a method for preparing negative electrodes of lithium metal batteries supported by carbon / tin composite substrates. Background technique: [0002] The development of efficient and clean new energy is also an important part of the country becoming a socialist modern power and optimizing the energy structure. Electrochemical energy storage is an indispensable part of the new energy field. As one of the most representative electrochemical energy storage devices, the development of lithium batteries has attracted much attention. At present, commercial lithium-ion batteries are close to their theoretical limit, but people's requirements for battery performance are constantly increasing. Therefore, it is imminent to develop battery materials with high energy density. Due to its ultra-high theoretical capacity (3860mAh g -1 ), low electrode potential (-3...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/04H01M4/66H01M10/052
CPCH01M4/0483H01M4/1395H01M4/661H01M4/663H01M4/665H01M10/052Y02E60/10
Inventor 丁书江曾嘉诚王元坤
Owner XI AN JIAOTONG UNIV
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