Lithium-based negative electrode material for solid-state battery, and preparation method and application thereof

A negative electrode material and solid-state battery technology, applied in battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve problems such as difficult large-scale production, difficult promotion, complex process, etc., to achieve wide application, increase the limit current density, promising effect

Active Publication Date: 2019-06-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are complex in technology,

Method used

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  • Lithium-based negative electrode material for solid-state battery, and preparation method and application thereof
  • Lithium-based negative electrode material for solid-state battery, and preparation method and application thereof
  • Lithium-based negative electrode material for solid-state battery, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In a high-purity argon atmosphere, according to the ratio of the mass content of metallic lithium to 60%, the battery-grade pure lithium metal and commercial graphite are mixed together in a high-temperature stirrer, and the metallic lithium is melted after the temperature is heated to 280°C. , control the constant temperature, under the mechanical stirring of the stainless steel stirrer, the rotating speed is 60r / min, and the time is 30min. After the constant temperature stirring is completed, adjust the stirring speed to 5 r / min and stir slowly.

[0040] Heat the lithium lanthanum zirconium oxide thin ceramic sheet to 280°C, and after the temperature reaches 280°C, uniformly coat the stirred lithium-graphite mixture on the ceramic sheet, and cool down to room temperature.

[0041] The amount of coating on the ceramic sheet is 1.5 mg / cm in terms of the coated lithium-graphite composite powder 2 .

[0042] figure 1 Be the SEM collection of illustrative plates of lith...

Embodiment 2

[0051] In a high-purity argon atmosphere, according to the ratio of the mass content of lithium metal to 90%, lithium metal with battery-grade purity and commercial carbon nanotubes are mixed, placed together in a high-temperature stirrer, and heated to 310°C to make lithium metal After melting, control the constant temperature, under the action of mechanical stirring of the stainless steel stirrer, the rotating speed is 80r / min, and the time is 40min. After the constant temperature stirring is completed, the heat supply of the high temperature stirrer is stopped, so that the lithium composite negative electrode material is gradually cooled to room temperature.

[0052] The composite material is rolled and thinned by a roller press in advance, and then the porous copper foil is used as a metal current collector, and the thinned lithium composite negative electrode material is transferred to the porous copper foil.

[0053] The selected porous copper foil is 200 mesh, the thick...

Embodiment 3

[0056] Commercialized graphite and commercialized carbon nanotubes were mixed according to the mass content of carbon nanotubes at a ratio of 5%, and then placed in a high-energy ball milling tank for mechanical ball milling (rotational speed 300r / min, time 1.5h), and ball milling was completed and taken out for use.

[0057] In a high-purity argon atmosphere, according to the ratio of the mass content of lithium metal to 80%, lithium metal of battery grade purity and the above-mentioned premix of graphite and carbon nanotubes are mixed, placed together in a high-temperature stirrer, and heated to After metal lithium is melted at 350°C, the temperature is controlled, and under the action of mechanical stirring of a stainless steel stirrer, the rotation speed is 100r / min, and the time is 50min. After the constant temperature stirring is completed, adjust the stirring speed to 5 r / min and stir slowly.

[0058] Heat the lithium lanthanum zirconium oxide thin ceramic sheet to 220°...

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Abstract

The invention relates to a lithium-based negative electrode material for a solid-state battery, and a preparation method and an application thereof. The lithium-based negative electrode material comprises the following components in parts by weight: 20-98 parts of lithium, and 2-80 parts of a blending agent. After the lithium is mixed with the blending agent, the mixture is heated to 180-400 DEG C, and the lithium-based negative electrode material is obtained after evenly stirring the heated mixture. The lithium-based negative electrode material is used in an all-solid-state battery and is compounded with a solid-state electrolyte. Compared with the prior art, the lithium negative electrode viscosity, lithium metal surface energy and the like are regulated and controlled through adopting the method of hot-melt compounding the lithium metal and the blending agent, carbon and oxygen elements are introduced in a controllable manner to realize tight combination between a negative electrodepole piece and the solid-state electrolyte, meanwhile, the interface composition between a negative electrode and the electrolyte is regulated and controlled, the interface resistance of the negativeelectrode and the electrolyte is reduced, the limit current density for lithium dendrite growth in the negative electrode and electrolyte circulation is improved, the reversible charge and dischargecapacity of the negative electrode is increased, and the stability during the interface cycle process of the negative electrode and the solid-state electrolyte is improved.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state lithium batteries, and relates to a lithium-based negative electrode material for solid-state batteries and a preparation method and application thereof. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, they have been rapidly applied to consumer electronics, power tools, drones and communication base stations due to their high specific energy density, no memory effect, long-term cycle stability and high average operating voltage. and other fields, providing effective energy solutions for the informatization and intelligence of modern society. At the same time, in recent years, the world's energy crisis has intensified and the excessive use of fossil energy has led to deteriorating natural environmental problems. In order to reduce dependence on fossil energy and reduce carbon emissions, countries have begun to vigorously promote and apply ele...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/1395H01M10/0525H01M10/0562H01M10/058
CPCY02E60/10Y02P70/50
Inventor 罗巍段建黄云辉伍旺炎
Owner TONGJI UNIV
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