Preparation method of laminar composite for negative electrode of secondary metal lithium battery

A battery negative electrode and compound technology, which is applied in the direction of electrode manufacturing, battery electrodes, lithium storage batteries, etc., can solve the problem of weak bonding, and achieve the effects of small overpotential, convenient operation, and long cycle life

Active Publication Date: 2017-05-10
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for most materials, it has a weak bond with elemental lithium, that is, it has lithium repellency.

Method used

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  • Preparation method of laminar composite for negative electrode of secondary metal lithium battery
  • Preparation method of laminar composite for negative electrode of secondary metal lithium battery
  • Preparation method of laminar composite for negative electrode of secondary metal lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Operation process such as figure 1 ,

[0038] A kind of Ti 3 C 2 -Li sheet-like composite, which is prepared by the following steps:

[0039] Take a lithium sheet and Ti with a mass ratio of 9:1 3 C 2 Nanosheet powder, in which the thickness of the lithium sheet is 1mm and the area is 4cm 2 , Ti 3 C 2 The thickness of the nanosheet is 5nm, the Ti 3 C 2 Spread the nanosheet powder evenly on the surface of the elemental lithium with a medicine spoon, push it horizontally into the pair of rollers with a gap of 0.5mm, and perform rolling to make the Ti 3 C 2 Nanosheet powder enters lithium metal, Ti after rolling 3 C 2 - The area of ​​the lithium complex is twice the area of ​​the original lithium sheet.

[0040] the Ti 3 C 2 -Li composite sheet is folded in half and rolled again, keeping the Ti 3 C 2 - Li has an area of ​​4cm 2 . The folding and rolling steps were repeated 10 times to finally obtain the layered Ti 3 C 2 - Li composite sheet, punching t...

Embodiment 2

[0046] A kind of G-Li flake compound (G represents graphene), its preparation method is basically the same as embodiment 1, and difference is that Ti 3 C 2 Nanosheet powder is replaced by graphene powder. The graphene used therein is prepared by the method of ultrasonically exfoliating bulk graphite, and the thickness of the graphene sheet is 1 nm.

[0047] Characterize the electrochemical performance of the obtained G-Li flake composite, the results can be found in Figure 4 with Figure 5 . Symmetrical battery tests show that the G-Li composite electrode is at 1mA / cm 2 Charge-discharge cycle under current density, its overpotential showed a trend of decreasing first and then increasing. The initial overpotential was 106mV, and the overpotential increased by 114% after 200 cycles.

Embodiment 3

[0049] A Cu-Li flaky composite, the preparation method of which is basically the same as in Example 1. The difference is that the Ti 3 C 2 The nano-sheet powder is replaced by Cu nano-powder with a particle size of 100-200nm. The number of repetitions of folding rolling was six times.

[0050] Characterize the morphology of the obtained Cu-Li flake composite, the results can be found in Figure 8 . with Ti 3 C 2 -Similar to Li, the composite exhibits a lamellar structure, but due to the different number of repetitions of folding and rolling, the corresponding sheet thickness is the same as that of Ti 3 C 2 - Li is different.

[0051] The electrochemical properties of the obtained Cu-Li flake composites were characterized. Figure 9 is the cycle performance graph of the layered Cu–Li symmetric battery. Symmetrical battery tests show that the Cu-Li composite electrode exhibits a more stable voltage distribution throughout the cycle than the pure Li electrode, at 1 mA / c...

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Abstract

The invention provides a preparation method of a laminar composite for a negative electrode of a secondary metal lithium battery. The preparation method comprises the following steps: (1) taking a metal lithium sheet and a compound additive; uniformly distributing the compound additive on the surface of the metal lithium sheet; pressing the compound additive into the metal lithium sheet by adopting a rolling method; (2) folding a composite of the metal lithium sheet and the compound additive and rolling to obtain a laminar-structure additive-metal lithium composite sheet; (3) repeating the step (2) for a plurality of times to obtain the composite with different metal lithium layer thicknesses. According to the preparation method provided by the invention, operation can be carried out through conventional roller rolling equipment and the process has the characteristics of convenience for operation and simple process. By adopting the method provided by the invention, the laminar composite of a lithiated nano-material and a lithium sheet is obtained; when the laminar composite is used as the negative electrode of the secondary metal lithium battery, related problems of growth of lithium dendrites can be solved.

Description

technical field [0001] The invention belongs to the field of secondary batteries, and in particular relates to a preparation method of an electrode material of a secondary metal lithium battery. Background technique [0002] As one of the most widely used and promising batteries in the world today, metal lithium batteries have the advantages of high specific energy and discharge performance, long working and storage life, high safe operation performance and low cost. With the emergence of new high-capacity lithium batteries such as Li-S batteries and Li-air batteries, the safe application of Li metal anodes has become a decisive factor for next-generation energy storage systems. [0003] Li metal has been regarded as the most ideal anode material for rechargeable lithium batteries, it has a very high theoretical specific capacity (3860mAh g -1 ), low density (0.59g cm -3 ) and the most negative electrochemical potential (about -3.04V compared to the standard hydrogen elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052H01M4/04H01M4/1395
CPCH01M4/0435H01M4/1395H01M4/366H01M4/382H01M4/62H01M10/052Y02E60/10
Inventor 李彬杨树斌
Owner BEIHANG UNIV
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