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Lithium-free cathode lithium battery system and electrode in-situ lithium nitride film preparation method

A lithium cathode and lithium battery technology, applied in the field of materials, can solve problems such as explosion, battery thermal runaway, and sharp decline in research and development interest in lithium-free cathodes, and achieve a wide range of choices and practical effects.

Active Publication Date: 2022-04-12
复阳固态储能科技(溧阳)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these lithium metal-based batteries have the risk of generating lithium dendrites to pierce the separator during cycling, causing thermal runaway and even explosion of the battery, so people's interest in the development of lithium-free cathodes has dropped sharply.

Method used

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  • Lithium-free cathode lithium battery system and electrode in-situ lithium nitride film preparation method
  • Lithium-free cathode lithium battery system and electrode in-situ lithium nitride film preparation method
  • Lithium-free cathode lithium battery system and electrode in-situ lithium nitride film preparation method

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preparation example Construction

[0036] By adopting the preparation method provided by the invention, the positive electrode or the negative electrode used in the lithium battery system without lithium positive electrode can be prepared.

[0037] In order to better understand the technical solution provided by the present invention, the following uses a number of specific examples to illustrate the application of the methods provided in the above-mentioned embodiments of the present invention for the preparation and construction of electrode in-situ lithium nitride thin films in lithium-free cathode lithium battery systems. Characterization of lithium battery systems with lithium-free cathodes.

Embodiment 1

[0039] This embodiment provides a method for constructing a novel lithium-ion battery system without a lithium positive electrode, comprising the following steps:

[0040] Disperse the positive electrode material chromium sulfur selenium CrSSe, conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) in nitrogen methyl pyrrolidone (NMP) at a mass ratio of 8:1:1, homogenize and coat on aluminum foil , made into anode sheet after drying and rolling.

[0041] Disperse the negative electrode material soft carbon (SC), conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) in nitrogen methyl pyrrolidone (NMP) at a mass ratio of 92:3:5, and coat it on copper after homogenizing. On the foil, the negative electrode sheet is made after drying and rolling, and the positive and negative electrode unit surface capacity ratio is 1:1.1.

[0042] Lithium metal is evaporated on the surface of the positive electrode by vacuum thermal evaporation. The prepared posi...

Embodiment 2

[0048] This embodiment provides a method for constructing a novel lithium-ion battery system without a lithium positive electrode, comprising the following steps:

[0049] The positive electrode material titanium disulfide TiS 2 , conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) are dispersed in nitrogen methyl pyrrolidone (NMP) at a mass ratio of 8:1:1, homogenized and coated on aluminum foil, and dried and rolled Make a positive electrode sheet.

[0050] Negative electrode material graphite, conductive carbon black (Super P), and polyvinylidene fluoride (PVDF) were dispersed in nitrogen-methylpyrrolidone (NMP) at a mass ratio of 92:3:5, homogenized and coated on copper foil. After drying and rolling, the negative electrode sheet is made, and the positive and negative electrode unit surface capacity ratio is 1:1.1.

[0051] Lithium metal is evaporated on the surface of the positive electrode by vacuum thermal evaporation. The prepared positive pole pie...

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Abstract

The invention relates to a lithium-free positive electrode lithium battery system and an electrode in-situ lithium nitride film preparation method. The lithium-free positive electrode lithium battery system includes: a lithium-free positive electrode, a lithium-free negative electrode, a diaphragm, an electrolyte, and a lithium nitride film layer The lithium nitride thin film layer is grown in situ on the surface of the lithium-free positive electrode or the lithium-free negative electrode, and assembled towards the separator; wherein, the lithium nitride thin film layer grown on the surface of the lithium-free positive electrode in situ is on the lithium-free positive electrode lithium During the charging process of the first week of the battery, lithium nitride decomposes to generate lithium ions, which are used as the lithium source of the lithium-free positive electrode lithium battery system; or, the lithium nitride thin film layer grown on the surface of the lithium-free negative electrode in situ is During the first week of discharge of the lithium cathode lithium battery, lithium nitride decomposes to generate lithium ions, which are used as a lithium source for the lithium-free cathode lithium battery system.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a lithium-free positive electrode lithium battery system and an electrode in-situ lithium nitride film preparation method. Background technique [0002] In the past few decades, the application and development of lithium-ion batteries have attracted great attention because of their impact on people's lives. Traditional lithium-ion batteries are generally matched by a lithium-containing positive electrode and a lithium-free negative electrode. During the cycle, lithium ions shuttle and deintercalate in a rocking-chair manner in the structure of the positive electrode and the negative electrode. In order to meet people's demand for higher performance of batteries with the development of society, researchers urgently need to develop lithium-free materials as cathodes to further increase the energy density of lithium-ion batteries. [0003] The research on lithium-free cathodes ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/058H01M10/0525H01M10/42
CPCH01M4/13H01M4/139H01M10/058H01M10/0525H01M10/4235Y02E60/10Y02P70/50
Inventor 李立飞
Owner 复阳固态储能科技(溧阳)有限公司
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