Alkali metal composite negative electrode and preparation method thereof and application of alkali metal composite negative electrode in preparing solid-state alkali metal battery

An alkali metal battery and alkali metal technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve problems such as unsatisfactory lithium dendrite effect, uneven alkali metal recombination, and uneven lithium distribution. To achieve the effect of inhibiting the growth of dendrites, enhancing the ability to inhibit lithium dendrites, and improving the diffusion performance

Active Publication Date: 2019-08-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This technical scheme uses an electrochemical method to deposit lithium in lithium-rich materials or lithium salts on graphene supported by copper foil to obtain a metal lithium/graphene composite negative electrode. Although this method can obtain a relatively uniform composite negative electrode, it is suitable for com

Method used

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  • Alkali metal composite negative electrode and preparation method thereof and application of alkali metal composite negative electrode in preparing solid-state alkali metal battery
  • Alkali metal composite negative electrode and preparation method thereof and application of alkali metal composite negative electrode in preparing solid-state alkali metal battery
  • Alkali metal composite negative electrode and preparation method thereof and application of alkali metal composite negative electrode in preparing solid-state alkali metal battery

Examples

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Embodiment 1

[0059] In an argon atmosphere, metal lithium is heated and melted, and then commercial carbon is placed on the surface of the molten lithium. After the carbon cloth is fully infiltrated by lithium, it is taken out, and naturally cooled to room temperature to obtain a lithium composite negative electrode; ethoxylated trimethylol Propane triacrylate monomer, Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 Ceramic powder (particle size 50-100nm), 1mol / L LiPF 6 The ethylene carbonate / propylene carbonate (volume ratio is 1:1) liquid electrolyte, mono-n-dodecyl phosphate is mixed in a weight ratio of 1:0.17:5:0.16, and fully stirred to obtain a solid electrolyte precursor Body; the above lithium composite bipolar, solid electrolyte precursor, commercial Celgard separator and LiCoO 2 The positive electrode is assembled into a liquid battery, and the initiator azobisisobutyronitrile (addition is 1wt% of the ethoxylated trimethylolpropane triacrylate monomer) is added, and then the battery is pack...

Embodiment 2

[0069] The preparation of the solid metal lithium battery is similar to Example 1, except that no functional additives are added to the solid electrolyte precursor. The obtained battery was tested at 60°C and 1C, and the capacity was 108mAh / g.

Embodiment 3

[0071] The preparation of the solid metal lithium battery is similar to Example 1, except that octyl phosphate is used as a functional additive instead of mono-n-dodecyl phosphate. The obtained battery was tested at 60°C and 1C, and the capacity was 120mAh / g.

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Abstract

The invention discloses an alkali metal composite negative electrode and a preparation method thereof and application of the alkali metal composite negative electrode in preparing a solid-state alkalimetal battery. The alkali metal composite negative electrode comprises a support layer and alkali metal loaded on the surface and the void of the support layer. The support layer is carbon cloth, 3Dporous graphene, a nickel mesh, a copper mesh or an aluminum mesh. The preparation of the solid-state alkali metal battery comprises the steps: placing the support layer in the molten alkali metal under the inert atmosphere, soaking it sufficiently and cooling so as to obtain the alkali metal composite negative electrode; a monomer containing unsaturated bonds, a ceramic electrolyte, a lithium salt and a selectively added functional additive are mixed with an organic solvent so as to obtain a solid-state electrolyte precursor; and assembling the alkali metal composite negative electrode, a positive electrode, a diaphragm and the solid-state electrolyte precursor to form a liquid battery and then adding an initiator and performing in-situ polymerization. The alkali metal composite negativeelectrode can effectively inhibit the formation of alkali metal dendrites and the interface reaction between the alkali metal and the electrolyte, and the prepared solid-state alkali metal battery hasbetter safety performance and comprehensive performance.

Description

technical field [0001] The invention relates to the field of novel solid-state batteries, in particular to an alkali metal composite negative electrode and a preparation method thereof, the application of the alkali metal composite negative electrode in the preparation of solid-state alkali metal batteries, and a novel solid-state alkali metal battery prepared therefrom. Background technique [0002] Although lithium-ion batteries still occupy a dominant position in secondary batteries, as new energy vehicles require higher and higher energy density of lithium-ion batteries, the energy density of traditional lithium-ion batteries based on intercalation reactions has reached the limit, namely The energy density of lithium-ion batteries with graphite as the negative electrode is close to the bottleneck value, and it is imperative to develop lithium batteries with metallic lithium as the negative electrode (including lithium-sulfur batteries and lithium-air batteries). On the o...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/38H01M10/0562H01M4/1395
CPCH01M4/1395H01M4/381H01M4/667H01M10/0562Y02E60/10
Inventor 谢健成浩赵新兵
Owner ZHEJIANG UNIV
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