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Lithium supplementation reagent and its preparation method and application

A technology for replenishing lithium and reagents, which is applied in the field of lithium replenishing reagents for lithium batteries and its preparation, can solve the problems of complex production process, high cost of lithium replenishment process, and high requirements for storage and use environment of passivation lithium powder.

Active Publication Date: 2021-06-25
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its production process is relatively complicated, and the obtained passivated lithium powder still has high requirements for storage and use environments, which makes the cost of lithium supplementation process remain high.

Method used

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  • Lithium supplementation reagent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Spherical Li-C 3 N 4 Preparation of complex

[0056] (1) Place 2.0g of melamine in an air atmosphere at 550°C, anneal for 4 hours, and synthesize g-C 3 N 4 ;

[0057] (2) Heating lithium metal to 300 °C under Ar atmosphere, adding 10 wt% g-C to the molten lithium metal 3 N 4 , stirred and incubated for 30min to obtain Li-C 3 N 4 composite melt;

[0058] (3) the above Li-C 3 N 4 The composite melt is moved into a spray device, and made into spherical particles in an Ar atmosphere, with a particle size ranging from 10 to 50 μm.

[0059] 2. Preparation of Stable Lithium Supplementary Additive

[0060] (1) SiCl 4 Dissolved in 1,3-dioxane (DOL) to obtain 0.02mol / L SiCl 4 DOL solution;

[0061] (2) the above Li-C 3 N 4 Composite into SiCl 4 DOL solution was stirred for 2 min, filtered and dried to obtain the prepared lithium supplementation reagent.

[0062] 3. Preparation of lithium-rich negative electrode sheet

[0063] (1) The negative electrode activ...

Embodiment 2

[0074] According to the same method as in Example 1 to prepare button cells, the difference is that the preparation of spherical Li-C 3 N 4 Complex steps, g-C 3 N 4 The added amount is 20wt% of lithium metal.

Embodiment 3

[0076] A button battery is prepared in the same manner as in Example 1, the difference is that in the step of preparing a stable lithium supplement additive, SiCl 4 Dissolved in 1,3-dioxane (DOL) to obtain 0.05mol / L SiCl 4 DOL solution.

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Abstract

The invention discloses a lithium supplement reagent, a preparation method and application thereof. The lithium supplementing agent comprises: an inner core and a multiphase composite layer. Among them, the inner core includes Li and Li‑C 3 N 4 Composite; a multiphase composite layer is formed on at least part of the surface of the inner core, the multiphase composite layer comprising: Li X Si alloys, LiCl and silicone polymers. The lithium supplementation reagent has stable performance, high lithium supplementation efficiency, simple preparation process and low cost.

Description

technical field [0001] The present invention relates to the field of lithium batteries, and in particular, the present invention relates to a lithium replenishing reagent for lithium batteries and a preparation method and application thereof. Background technique [0002] In the field of electric vehicles, short cruising range is still a major pain point limiting the popularity of electric vehicles, which requires batteries to develop towards high energy density. This trend requires the use of higher capacity electrode materials for next-generation batteries. The transformation of anode materials from graphite to silicon-based materials can significantly improve the energy density of power batteries. However, due to the volume effect of the charge-discharge cycle of silicon materials, the current industry is more inclined to use silicon-oxygen materials as the negative electrode material of power batteries. The active material of the silicon-oxygen negative electrode mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/131H01M4/133H01M4/134H01M10/04H01M10/052
CPCH01M4/131H01M4/133H01M4/134H01M4/382H01M4/628H01M10/0427H01M10/052H01M2004/021H01M2004/027Y02E60/10Y02P70/50
Inventor 邱昭政赵育松李文龙梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD