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Anode material for lithium metal batteries

A technology for lithium metal batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unfavorable commercial production, increase the overall weight of the battery, cumbersome preparation process, etc., and achieve increased cycle performance and safety. The effect of controllable thickness and simple preparation process

Inactive Publication Date: 2017-06-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods increase the overall weight of the battery, and the preparation process is cumbersome, which is not conducive to commercial production

Method used

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  • Anode material for lithium metal batteries
  • Anode material for lithium metal batteries
  • Anode material for lithium metal batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] With LiF as the target material and lithium sheet as the substrate, the magnetron sputtering power is set to 80W, the air pressure is set to 10mTorr, and the time is set to 20min, a LiF film with a thickness of 150nm is deposited on the surface of the lithium sheet, which is used for lithium The anode material of the metal battery, its SEM image is shown in figure 1 .

[0028] The negative electrode material prepared in this embodiment is used as an electrode of a lithium metal symmetric battery, and PC with 1M lithium bistrifluoromethanesulfonimide (LiTFSI) added is used as an electrolyte. Cell assembly was performed in an argon-protected glove box using a 2032-size coin cell. The current density of the galvanostatic test is 1mA cm -2 , with a capacity of 1mAh cm -2 , performance see figure 2 .

[0029] After 10 cycles, the SEM image of the negative electrode material is as follows: image 3 shown, observe image 3 It can be seen that no lithium textured crysta...

Embodiment 2

[0031] With LiF as the target material and lithium sheet as the substrate, the magnetron sputtering power is set to 80W, the air pressure is set to 10mTorr, and the time is set to 10min, a LiF film with a thickness of 75nm is deposited on the surface of the lithium sheet, which is used for lithium The negative electrode material of the metal battery, its SEM picture is similar to embodiment 1.

[0032] The negative electrode material prepared in this example is the electrode of a lithium metal symmetric battery. The lithium metal battery was assembled with reference to the raw materials and assembly process in Example 1. After testing, the performance was similar to that in Example 2. The current density of the galvanostatic test is 1mA cm -2 , with a capacity of 1mAh cm -2 , performance see Figure 4 .

[0033] After 10 cycles, the SEM image of the negative electrode material is similar to that of Example 1.

Embodiment 3

[0035] With LiF as the target and lithium sheet as the substrate, the power of magnetron sputtering is set to 100W, the air pressure is set to 10mTorr, and the time is set to 50min, a LiF film with a thickness of 500nm is deposited on the surface of the lithium sheet, which is used for lithium The negative electrode material of the metal battery, its SEM picture is similar to embodiment 1.

[0036] The negative electrode material prepared in this example is the electrode of a lithium metal symmetric battery. The lithium metal battery was assembled with reference to the raw materials and assembly process in Example 1. After testing, the performance was similar to that in Example 2. The current density of the galvanostatic test is 1mA cm -2 , with a capacity of 1mAh cm -2 , performance see Figure 5 .

[0037] After 10 cycles, the SEM image of the negative electrode material is as follows: Image 6 shown, observe Image 6 It can be seen that lithium textured crystals are fo...

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Abstract

The invention discloses an anode material for lithium metal batteries. The anode material is prepared from a lithium slice and an artificial solid electrolyte interface film, wherein the artificial solid electrolyte interface film is deposited on the surface of the lithium slice by a magnetron sputtering method; the artificial solid electrolyte interface film is at least one selected from LiF, LiBr, LiCl, LiI, Li2CO3, LiOH, Li3P, Li3PO4, LiNO3, Li2S, Li2SO4 and Li3N. The anode material for the lithium metal batteries is formed by enabling inorganic lithium salt to be physically deposited on the lithium slice; the anode material for the lithium metal batteries can effectively inhibit the growth of lithium dendrites and improve the safety and cycle performance of the lithium metal batteries.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a negative electrode material for lithium metal batteries. Background technique [0002] Lithium-ion batteries have a wide range of applications in modern life. Although lithium-ion batteries have been widely used in various electronic devices, hybrid vehicles, and pure electric vehicles, due to its graphite negative electrode and lithiated positive electrode, the capacity has almost reached the theoretical capacity. Lithium metal batteries are ideal next-generation batteries due to their high specific capacity. [0003] There are still many problems to be solved in lithium metal batteries, and the biggest challenge is the growth of lithium dendrites. With the cycle of the battery, the lithium dendrites will continue to grow and accumulate. Once the lithium dendrites pierce the battery diaphragm and connect the positive and negative electrodes of the battery, it will cause a sh...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/382H01M4/628H01M10/0525Y02E60/10
Inventor 陆盈盈范磊
Owner ZHEJIANG UNIV
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