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Lithium supplementing additive and preparation method thereof and lithium ion battery

A lithium-ion battery and additive technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of not easy to be compatible with lithium-ion battery processing and manufacturing technology, and the stability of lithium-replenishing materials needs to be improved, and achieve large-scale industrialization. The effect of production, improved conductivity, and shorter process flow

Active Publication Date: 2020-05-22
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the above-mentioned solutions all have the problem that the stability of the lithium-supplementing material needs to be improved, and it is not easy to be compatible with the existing lithium-ion battery processing and manufacturing technology.

Method used

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  • Lithium supplementing additive and preparation method thereof and lithium ion battery

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Embodiment 1

[0057] This embodiment prepares lithium supplement additive according to the following method:

[0058] (1) Under nitrogen protection, use MnO with an average particle size of 5 μm 2 , and lithium metal were heated at 185°C for 30min (the molar ratio of Li to Mn was 4:1), and then heated at 200°C for 3h to obtain the core material.

[0059] (2) Grind the core material described in step (1) and pass through a 325-mesh screen; dissolve 10 g of CTAB in an organic solvent, then ultrasonically disperse 1 g of the core material in 200 g of solvent, then add 0.1 mL of TEOS, and Add 10 mL of ammonia water (mass concentration 25%), react for 2 hours, and then filter to obtain a precursor, which is then sintered at 500° C. for 5 hours under a nitrogen atmosphere to obtain the lithium-supplementing additive.

[0060] The lithium-supplementing additive prepared in this embodiment comprises an inner core and a shell coated on the surface of the inner core, and the inner core includes Li ...

Embodiment 2

[0063] This embodiment prepares lithium supplement additive according to the following method:

[0064] (1) Under nitrogen protection, Fe with an average particle size of 20 μm is used 2 o 3 , after heating with lithium metal at 183°C for 35min (the molar ratio of Li to Fe is 3:1), and then heating at 197°C for 3.2h to obtain the core material.

[0065] (2) Grind the core material described in step (1) and pass through a 325-mesh sieve; dissolve 10 g of CTAB in an organic solvent, then ultrasonically disperse 1 g of the core material in a 200 °C solvent, then add 0.2 mL of TEOS, and Add 10mL ammonia water (mass concentration 25%), react for 2.2h and then filter to obtain the precursor, which is then sintered at 420°C for 5.5h under a nitrogen atmosphere to obtain the lithium supplement additive.

[0066] The lithium-supplementing additive prepared in this embodiment comprises an inner core and a shell coated on the surface of the inner core, and the inner core includes Li 2...

Embodiment 3

[0069] This embodiment prepares lithium supplement additive according to the following method:

[0070] (1) Under the protection of argon, use NiO with an average particle size of 3 μm, heat with lithium metal at 180 °C for 40 min (the molar ratio of Li to Ni is 2:1), and then heat at 195 °C for 3.5 h to obtain core material.

[0071] (2) Grind the core material described in step (1) and pass through a 325 mesh screen; after dissolving 5g of PVP in an organic solvent, ultrasonically disperse 1g of the core material in a 200°C solvent, then add 0.2mL TEOS, and Add 5mL ammonia water (mass concentration 25%), react for 1.5h and then filter to obtain the precursor, which is then sintered at 450°C for 6h under an argon atmosphere to obtain the lithium supplement additive.

[0072] The lithium-supplementing additive prepared in this embodiment comprises an inner core and a shell coated on the surface of the inner core, and the inner core includes Li 2 A mixture of O and metallic N...

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Abstract

The invention provides a lithium supplementing additive and a preparation method thereof and a lithium ion battery. The lithium supplementing additive comprises an inner core and a shell coating the surface of the inner core, the inner core comprises Li2O and metal M, and the shell comprises SiOx and carbon. The method comprises the following steps: 1) mixing an oxide of metal M with metal lithium, and carrying out a heating reaction in a protective atmosphere to obtain an inner core material; and 2) mixing the core material, a pore-forming agent and an organic silicon source in a solvent, adding an alkaline substance, carrying out a reaction, carrying out solid-liquid separation after the reaction, and sintering the obtained solid in a protective atmosphere to obtain the lithium supplementing additive. The lithium supplementing additive provided by the invention has high stability, and can be completely compatible with the existing lithium battery processing and manufacturing technology.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium supplement additive, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Lithium-ion batteries pursue high energy density, and increasing capacity is one of the ways to increase energy density. [0003] The first coulombic efficiency of the positive and negative electrode materials of lithium-ion batteries is les...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 王辉胡志海廖涛李辉侯桃丽何巍刘金成
Owner EVE ENERGY CO LTD
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