Lithium metal protective layer and preparation method thereof and battery with protective layer
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A technology of lithium metal and protective layer, applied in the field of protective layer of electrode lithium metal, can solve the problems such as the inability to fundamentally reduce the activity of lithium metal, the inability to fundamentally inhibit the activity of lithium, the complicated preparation process, etc. The effect of inhibiting the generation of lithium dendrites and the simple preparation method
Inactive Publication Date: 2020-08-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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[0004] Nowadays, Chinese patent application CN201610252135.6 and Chinese patent application CN201610319583.3 both propose to stabilize the main body with a support structure or a skeleton structure. Although the problem of volume expansion of lithium metal deposition is solved, it cannot fundamentally reduce the density of lithium metal. active
In addition, there are also studies on the protective layer of lithium metal electrodes, which basically form a protective layer on the surface of metal lithium. For example, Chinese patent CN102315420B discloses a metal negative electrode structure with a protective layer. The organic protective film formed on the metal negative electrode and the organic protective film is formed with an i...
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Embodiment 1
[0031] This embodiment provides a lithium metal protective layer, the preparation process is:
[0032] In the first step, aluminum nitride, conductive agent Super-P and binder PVDF are mixed according to the mass ratio of 7:1:2, and stirred for 4 hours.
[0033] In the second step, the above mixture is coated on the surface of the copper foil with a coating thickness of 400 μm, and dried in an oven at 60° C.
[0034] In the third step, the dried above-mentioned copper foil pole piece is placed in a vacuum drying oven to dry at a temperature of 120° C. for 720 hours.
Embodiment 2
[0036] This embodiment provides a lithium metal protective layer, the preparation process is:
[0037] In the first step, titanium nitride, conductive agent Super-P and binder PVDF are mixed according to the mass ratio of 7:1:2, and stirred for 4 hours.
[0038] In the second step, the above mixture is coated on the surface of the copper foil with a coating thickness of 400 μm, and dried in an oven at 60° C.
[0039] In the third step, the dried above-mentioned pole piece is placed in a vacuum drying oven to dry at a temperature of 120° C. for 720 hours.
Embodiment 3
[0041] This embodiment provides a lithium metal protective layer, the preparation process is:
[0042] In the first step, chromium nitride, conductive agent Super-P and binder PVDF are mixed according to the mass ratio of 7:1:2, and stirred for 4 hours.
[0043] In the second step, the above mixture is coated on the surface of the copper foil with a coating thickness of 400 μm, and dried in an oven at 60° C.
[0044] In the third step, the dried above-mentioned pole piece is placed in a vacuum drying oven to dry at a temperature of 120° C. for 720 hours.
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Abstract
The invention discloses a lithium metal protective layer. The preparation raw materials comprise a metal compound, a conductive agent and a binding agent, wherein the mass ratio of the metal compoundto the conductive agent to the binding agent is (6-8):1:(1-3), the metal compound is one or more of metal nitride, aluminum oxide, aluminum fluoride and Al4Li9, and the metal nitride and lithium metalcan form lithium alloy and lithium nitride through an in-situ electrochemical reaction. The lithium metal protective layer is a porous layer and provides a host material for lithium metal deposition;and in addition, the lithium metal protective layer also generates uniformly dispersed lithium alloy and/or lithium nitride in situ in the battery, so that the lithium affinity sites are enhanced, the lithium ion diffusion capacity is improved, and the generation of lithium dendrites is inhibited. The lithium metal protective layer can be prepared by slurry coating and drying, the preparation method is simple and convenient, the raw material source is cheap, and the thickness of the protective layer is easier to control. The lithium metal battery with the protective layer can inhibit the generation of lithium dendrites, and reduce the activity of lithium metal, and the cycle life of the lithium metal battery can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of batteries, in particular to a protective layer of electrode lithium metal, and to a preparation method thereof. Background technique [0002] Before lithium-ion batteries were introduced by Sony in Japan in 1992, lithium metal batteries had already been studied by scientists and put into practical use. But in 1989, because Li / MO 2 Lithium metal secondary batteries caught fire, and except for a few companies, most companies withdrew from the development of lithium metal secondary batteries. The research and development of lithium metal secondary batteries has basically stopped. The key reason is that during the charging process, due to the uneven surface of the lithium metal electrode, the difference in the electrodeposition rate causes uneven deposition, resulting in the generation of lithium dendrites on the negative electrode. When the lithium dendrite grows to a certain extent, it will be broken, res...
Claims
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