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A kind of negative electrode material and application thereof for solid-state lithium battery

A lithium battery and negative electrode technology, applied in the field of negative electrode materials for solid-state lithium batteries, can solve the problems of limited cycle life of lithium alloy electrodes, and achieve the effects of suppressing side reactions, improving utilization, and high specific capacity

Active Publication Date: 2022-03-25
SHENZHEN AUTOMOTIVE RES INST BEIJING INST OF TECH (SHENZHEN RES INST OF NAT ENG LAB FOR ELECTRIC VEHICLES)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although lithium alloy materials have many advantages, the huge volume change in the repeated plating / stripping process will lead to limited cycle life of lithium alloy electrodes; therefore, how to solve the long-term cycle stability of lithium alloy anode materials is an urgent need for the industry to solve important technical issues

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  • A kind of negative electrode material and application thereof for solid-state lithium battery
  • A kind of negative electrode material and application thereof for solid-state lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0056] The negative electrode material of this example is a lithium, tin, magnesium ternary alloy with a mass ratio of lithium: tin: magnesium = 90:5:5. The specific method for preparing the negative electrode is as follows:

[0057] In a glove box, water and an argon atmosphere with an oxygen content of less than 10ppm, accurately weigh metal lithium, metal tin and metal magnesium at a mass ratio of 90:5:5, and place them in a stainless steel container at 10°C / min heating rate to 350°C and keep for 60 minutes to obtain evenly mixed molten metal. Use a copper block to dip the molten metal evenly and press it on the copper foil. After cooling to room temperature, an ultra-thin lithium-tin-magnesium alloy is obtained. After cutting, a 16mm pole piece is obtained, which is marked as Li-Sn-Mg- 1; On the copper foil in this example, the thickness of the ultra-thin lithium-tin-magnesium alloy layer is about 30µm.

[0058] All operations for making solid-state batteries are carried...

Embodiment 2

[0061] The negative electrode material of this example is the lithium, tin, magnesium ternary alloy of mass ratio lithium: tin: magnesium=95:2.5:2.5, and the specific method for preparing negative electrode is as follows:

[0062] In the glove box, water and argon atmosphere with oxygen content below 10ppm, accurately weigh metal lithium, metal tin and metal magnesium according to the mass ratio of 95:2.5:2.5, and place them in a stainless steel container at 10°C / min heating rate to 450°C and keep for 30 minutes to obtain a uniformly mixed molten metal. Use a copper block to dip the molten metal evenly and press it on the copper foil. After cooling to room temperature, an ultra-thin lithium-tin-magnesium alloy is obtained. After cutting, a 16mm pole piece is obtained, which is marked as Li-Sn-Mg- 2; On the copper foil in this example, the thickness of the ultra-thin lithium-tin-magnesium alloy layer is about 30µm.

[0063] All operations for making solid-state batteries are ...

Embodiment 3

[0066] The negative electrode material of this example is a lithium, tin, magnesium ternary alloy with a mass ratio of lithium: tin: magnesium = 98:1:1. The specific method for preparing the negative electrode is as follows:

[0067] In the glove box, in an argon atmosphere with water and oxygen content below 10ppm, accurately weigh metal lithium, metal tin and metal magnesium at a mass ratio of 98:1:1, and place them in a stainless steel container at 10°C / min heating rate to 400°C and keep for 45 minutes to obtain evenly mixed molten metal. Use a copper block to dip the molten metal evenly and press it on the copper foil. After cooling to room temperature, an ultra-thin lithium-tin-magnesium alloy is obtained. After cutting, a 16mm pole piece is obtained, which is marked as Li-Sn-Mg- 3; On the copper foil in this example, the thickness of the ultra-thin lithium-tin-magnesium alloy layer is about 30µm.

[0068] All operations for making solid-state batteries are carried out ...

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Abstract

The application discloses a negative electrode material for a solid-state lithium battery and an application thereof. The negative electrode material used in the solid state lithium battery in this application is an alloy of lithium, tin and magnesium, wherein the mass ratio of lithium, tin and magnesium is lithium: tin: magnesium = 90-99: 0.5-9.5: 0.5-9.5. The anode material used in this application for solid-state lithium batteries adopts a special composition and ratio of lithium, tin and magnesium ternary alloys; wherein the appropriate amount of tin and magnesium can make the lithium anode material maintain a high capacity and energy density Under the premise of , it can effectively reduce the reactivity of the lithium negative electrode, suppress the side reaction between the lithium negative electrode and the electrolyte, obtain a stable lithium / electrolyte interface, and improve the utilization rate of lithium. The application provides a new negative electrode material with high specific capacity, cycle stability and rate performance for solid-state lithium batteries.

Description

technical field [0001] The present application relates to the technical field of anode materials for solid-state lithium batteries, in particular to an anode material for solid-state lithium batteries and its application. Background technique [0002] In recent years, lithium-ion batteries have been mass-produced and widely used in portable electronic devices, electric vehicles and other fields. However, the specific capacity of current commercial anode materials is low, such as graphite is 372 mAh g -1 , lithium titanate only 175 mAh g -1 ; and, due to the embedded energy storage mechanism, its actual energy density is gradually approaching the limit value of 300 Wh kg -1 . However, although the specific capacity of silicon with high specific capacity can reach 4200 mAh g -1 , however, the commercialization process is slow due to the pulverization and shedding of the active material during the repeated deintercalation process due to the huge volume expansion of silicon....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/40H01M4/38H01M4/46H01M4/134H01M4/1395H01M4/04H01M10/052
CPCH01M4/405H01M4/387H01M4/466H01M4/134H01M4/1395H01M4/0488H01M10/052H01M2004/027H01M2004/021H01M2220/20H01M2220/30Y02E60/10
Inventor 陈海伟王文伟焦筱娟赵文翔朱盟
Owner SHENZHEN AUTOMOTIVE RES INST BEIJING INST OF TECH (SHENZHEN RES INST OF NAT ENG LAB FOR ELECTRIC VEHICLES)