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Lithium metal negative electrode for secondary battery, preparation method and application of lithium metal negative electrode

A secondary battery and metal lithium technology, which is applied in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve problems such as poor stability, and achieve the effects of preventing clogging, high specific surface characteristics, and preventing lithium dendrite growth

Active Publication Date: 2018-04-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the three-dimensional porous lithium negative electrode, especially the technical problem of poor stability at high current density, the present invention aims to provide a lithium negative electrode with a new structure for secondary batteries

Method used

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  • Lithium metal negative electrode for secondary battery, preparation method and application of lithium metal negative electrode
  • Lithium metal negative electrode for secondary battery, preparation method and application of lithium metal negative electrode
  • Lithium metal negative electrode for secondary battery, preparation method and application of lithium metal negative electrode

Examples

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Effect test

Embodiment 1

[0040] Sputter a layer of nano-Au particles on the bottom (any plane) of the nickel foam current collector (Ni foam) as a lithium deposition induction layer by ion sputtering method (using a gold plate as a target, sputtering for 200s at a current of 20mA) , the thickness of the nano-Au particle layer is about 10nm. A porous lithium anode (Au / Ni foam) was fabricated by depositing Li in Au-modified porous nickel by electrodeposition in a glove box. The SEM image of the prepared porous lithium anode is shown in figure 1 Part (a) of ; EDS diagram see figure 1 Part (b) of.

[0041] With metal lithium sheet as positive electrode, 1M LiTFSI / DOL:DME (volume ratio=1:1) contains 1%wtLiNO 3 Be electrolytic solution, be assembled into 2032 button-type lithium-ion batteries with the lithium negative pole that the present invention makes (according to figure 2 Assembled in the same way, that is, the surface sputtered with Au particles is set at the far end of the separator), the separ...

Embodiment 2

[0045] A layer of nano-ZnO particles was grown on the bottom of the carbon paper (CP) current collector as a lithium deposition induction layer by magnetron sputtering (using a zinc oxide plate as a target, sputtering for 15 s at a sputtering power of 80W), and nano-ZnO The thickness of the layer is 5 nm. A 2025 button lithium-ion battery was assembled in a glove box with Celgard 2400 as a separator, and Li was deposited in a ZnO-modified carbon paper current collector by electrodeposition to prepare a porous ZnO / C lithium anode. The carbon paper lithium anode with the same structure and no lithium deposition induction layer was coated as a comparison sample (morphology and energy spectrum see Figure 5 ). Test finds, adopt the present invention to have the ZnO / C lithium negative pole of lithium deposition lure layer in 1mA / cm 2 The cycle life under charge and discharge current density is 5 times that of ordinary carbon paper lithium anode ( Image 6 ).

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Abstract

The invention discloses a lithium metal negative electrode for a secondary battery. The lithium metal negative electrode comprises a three-dimensional porous current collector, a lithium metal activesubstance dispersed into pores of the current collector, and a lithium deposition induction layer compounded on any plane of the current collector. Furthermore, the invention further discloses a preparation method and application of the negative electrode, and a lithium-ion secondary battery obtained through assembly of the negative electrode. The lithium metal negative electrode has the unique advantage that the lithium deposition induction layer is deposited on one plane of the current collector, so that unexpected improvement of the stability, especially the stability at high current density (for example, 3-5mA / cm<2>), of the negative electrode is facilitated. According to the method, the problems of pore plugging and lithium dendrite growth caused by preferential deposition of lithiumon the surface of the electrode in the three-dimensional porous lithium negative electrode are effectively solved, the charge-discharge coulomb efficiency of a lithium positive electrode is improved and the cycle life of the lithium positive electrode is prolonged.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to a lithium metal negative electrode for a high specific energy secondary battery. Background technique [0002] Lithium metal has a very high theoretical energy density (3860mAh / g), the lowest reduction potential (-3.040Vvs. SHE) and a low density (0.53g / cm 3 ), has been the most attractive battery anode material. However, two problems limit the application of lithium metal in secondary battery negative electrodes. One is that lithium dendrites grow to form a loose lithium "moss" layer, and the SEI film on the surface of "moss" lithium continues to form, peel off, and accumulate during charge and discharge, resulting in low battery charge and discharge efficiency and continuous increase in interface impedance; The growth of lithium dendrites and the resulting "dead lithium" bring safety problems and loss of electrode active materials to the battery. [0003] Th...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/0426H01M4/045H01M4/134H01M4/1395H01M10/0525Y02E60/10
Inventor 赖延清范海林洪波洪树
Owner CENT SOUTH UNIV
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