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Preparation method of modified metal lithium negative electrode

A lithium metal anode and modification technology, applied in battery electrodes, lithium storage batteries, electrical components, etc., can solve the problems of lithium battery coulombic efficiency and cycle life attenuation, difficult formation and growth, and increased contact area. Battery safety, formation and growth inhibition, and stable cycling effects

Active Publication Date: 2018-08-24
利信(江苏)能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many problems to be overcome in order to completely replace graphite anodes with lithium metal anodes. The problem of inhibiting the formation and growth of lithium dendrites in lithium metal anodes is always difficult to solve.
The formation and growth of lithium dendrites mainly bring the following two hazards: first, lithium dendrites will pierce the separator, resulting in a short circuit inside the battery, forming a serious safety hazard; second, the formation and growth of lithium dendrites will lead to electrolysis The contact area between the liquid and lithium metal increases, the lithium dendrites continue to grow, and the electrolyte continues to decompose, resulting in a rapid decline in the Coulombic efficiency and cycle life of the lithium battery.

Method used

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  • Preparation method of modified metal lithium negative electrode
  • Preparation method of modified metal lithium negative electrode
  • Preparation method of modified metal lithium negative electrode

Examples

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Effect test

Embodiment 1

[0024] A method for preparing a modified lithium metal negative electrode, comprising the steps of:

[0025] (1) Oxidize metal lithium sheet at room temperature for 0.5h under pure oxygen gas atmosphere to obtain substance A;

[0026] (2) React substance A with γ-mercaptopropyltrimethoxysilane and tetrabutyl orthosilicate in a steam flow with a volume ratio of 1:1 at 100°C for 4 hours;

[0027] (3) heating the reaction product obtained in step (2) at 120° C. for 0.5 h to obtain the modified lithium metal negative electrode.

Embodiment 2

[0029] A method for preparing a modified lithium metal negative electrode, comprising the steps of:

[0030] (1) Oxidize metal lithium powder at room temperature for 2 hours in air atmosphere to obtain substance A;

[0031] (2) React substance A with γ-mercaptopropyltrimethoxysilane and ethyl orthosilicate in a steam flow with a volume ratio of 1:2 at 150°C for 8 hours;

[0032] (3) heating the reaction product obtained in step (2) at 100° C. for 1 h to obtain the modified lithium metal negative electrode.

Embodiment 3

[0034] (1) Oxidize the metal lithium strip for 1 hour in an atmosphere with a nitrogen and oxygen volume ratio of 1:1 to obtain substance A;

[0035] (2) React substance A with γ-mercaptopropyltrimethoxysilane and methyltriethoxysilane in a steam flow with a volume ratio of 2:1 at 200°C for 12 hours;

[0036] (3) heating the reaction product obtained in step (2) at 80° C. for 2 hours to obtain the modified lithium metal negative electrode.

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Abstract

The invention discloses a preparation method of a modified metal lithium negative electrode. The preparation method comprises the steps of oxidizing metal lithium for 0.5-2 hours under a gas atmosphere, and performing reaction in steam flow of a silane coupling agent and silicate ester for 4-16 hours under 60-200 DEG C; and finally, heating for 0.5-2 hours under 60-200 DEG C, thereby obtaining themodified metal lithium negative electrode. Compared with the prior art, the preparation method has the following advantages that the preparation process is simple, the material cost is low, the formation and the growth of lithium dendrites are effectively prevented, the safety of a battery is improved, and the probability of a potential risk is reduced; the prepared modified metal lithium negative electrode has the advantages of long circulation and high stability; and compared with a lithium-sulfur full battery prepared from a sulfur positive and the metal lithium negative electrode which isnot modified, the modified metal lithium negative electrode has longer service lifetime and stable cycle property.

Description

technical field [0001] The invention relates to the field of lithium metal electrodes, in particular to a preparation method of a modified lithium metal negative electrode. Background technique [0002] In recent years, with the rapid development of portable electronic devices, electric vehicles, and grid energy storage technologies, the demand for high-energy-density, high-safety batteries and energy storage systems has become increasingly urgent. Among the electrochemical energy storage devices that have been commercialized, lithium-ion batteries have become the best choice for people because of their high energy density and long cycle life. However, efforts to increase the energy density of lithium-ion batteries have been slow in recent years due to limitations in electrode materials. Graphite is currently the most widely used anode material for lithium-ion batteries. The theoretical capacity of graphite is only 372mAh / g, which has become increasingly difficult to meet p...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/1395H01M10/052
CPCH01M4/1395H01M4/382H01M10/052Y02E60/10
Inventor 朱业程君王玉虎
Owner 利信(江苏)能源科技有限责任公司