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Lithium ion solid-state battery positive electrode and preparation process thereof, and lithium ion solid-state battery

A solid-state battery and lithium-ion technology, applied in the direction of electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve the problems affecting the stability and uniformity of the coating layer, the difficulty of grasping the thickness of the coating layer, etc., to achieve improved The first efficiency and discharge capacity, the effect of reducing requirements and increasing solid content

Active Publication Date: 2020-09-25
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the solid electrolyte coating of the above invention is more difficult to control the thickness of the coating layer during coating, thus affecting the stability and uniformity of the coating layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The positive electrode of the lithium-ion solid-state battery of the present embodiment is prepared as follows:

[0057] 1) Coating a positive electrode active material layer consisting of 10wt% PTFE, 10wt% carbon fiber, and 80wt% nickel-cobalt lithium manganese oxide on the surface of the aluminum foil, and drying it;

[0058]2) Dissolve 35wt% lithium bicarbonate, 55wt% lithium lanthanum zirconium oxide, and 10wt% PTFE in NMP (slurry solid content 60wt%) to prepare a solid electrolyte coating solution, and set the coating thickness of the coating machine to 15 μm, the copper foil transfer rate is 2m / s, and the solid electrolyte coating solution is coated on the surface of the positive electrode active material layer;

[0059] 3) After the coating is completed, enter the heating area, the drying temperature is 180°C, and the residence time is 5min. After winding, it is dried in an oven at 105°C for 24h, and the dried electrode sheet is rolled and cut to obtain lithium i...

Embodiment 2

[0066] The positive electrode of the lithium-ion solid-state battery of the present embodiment is prepared as follows:

[0067] 1) Coating a positive electrode active material layer consisting of 10wt% PTFE, 10wt% carbon fiber, and 80wt% nickel-cobalt lithium manganese oxide on the surface of the aluminum foil, and drying it;

[0068] 2) Dissolve 40wt% lithium bicarbonate, 50wt% lithium lanthanum zirconium oxide, and 10wt% PTFE in NMP (slurry solid content 60wt%) to prepare a solid electrolyte coating solution, and set the coating thickness of the coating machine to 15 μm, the copper foil transfer rate is 2m / s, and the solid electrolyte coating solution is coated on the surface of the positive electrode active material layer;

[0069] 3) After the coating is completed, enter the heating area, the drying temperature is 180°C, and the residence time is 5min. After winding, it is dried in an oven at 105°C for 24h, and the dried electrode sheet is rolled and cut to obtain lithium ...

Embodiment 3

[0076] The positive electrode of the lithium-ion solid-state battery of the present embodiment is prepared as follows:

[0077] 1) Coating a positive electrode active material layer consisting of 10wt% PTFE, 10wt% carbon fiber, and 80wt% nickel-cobalt lithium manganese oxide on the surface of the aluminum foil, and drying it;

[0078] 2) Dissolve 30wt% lithium bicarbonate, 60wt% lithium lanthanum zirconium oxide, and 10wt% PTFE in NMP (slurry solid content 60wt%) to prepare a solid electrolyte coating solution, and set the coating thickness of the coating machine to 15 μm, the copper foil transfer rate is 2m / s, and the solid electrolyte coating solution is coated on the surface of the positive electrode active material layer;

[0079] 3) After the coating is completed, enter the heating area, the drying temperature is 180°C, and the residence time is 5min. After winding, it is dried in an oven at 105°C for 24h, and the dried electrode sheet is rolled and cut to obtain lithium ...

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Abstract

The invention discloses a lithium ion solid-state battery positive electrode and a preparation process thereof, and a lithium ion solid-state battery. The lithium ion solid-state battery positive electrode comprises a positive electrode active material layer, wherein the surface of the positive electrode active material layer is coated with a solid electrolyte coating, the preparation raw materials of the solid electrolyte coating comprise lithium bicarbonate, the mass of the lithium bicarbonate accounts for 35-45wt% of the total mass of the formula system of the solid electrolyte coating, thethickness of the solid electrolyte coating is 5-30 [mu]m, a sulfide layer is further arranged between the solid electrolyte coating and the positive electrode active material layer, the thickness ofthe sulfide layer is 0.1-3 [mu]m, the preparation raw materials of the sulfide layer comprise sulfide, and the mass of the sulfide accounts for 85-99wt% of the mass of the sulfide layer. The solid-state electrolyte coating of the positive electrode of the lithium ion solid-state battery is moderate in solid content and has good stability and uniformity.

Description

technical field [0001] The invention belongs to the field of lithium-ion solid-state batteries, in particular to a positive electrode of a lithium-ion solid-state battery and a preparation process thereof, in particular to a lithium-ion solid-state battery prepared by preparing a positive electrode of a lithium-ion solid-state battery. Background technique [0002] In the prior art, it is advantageous to coat a solid electrolyte layer on the surface of the electrode active material layer, and a thinner coating layer is more conducive to the improvement of battery performance. However, due to the limitations of the current coating technology, the current coating equipment still cannot fully guarantee the coating quality for coatings close to the nanoscale, which affects the stability of the coating layer; at the same time, for the solidification of the coating slurry The content also has certain requirements. If the solid content is too low, the difficulty of coating will inc...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/131H01M4/139H01M4/1391H01M4/04H01M10/0525
CPCH01M4/0404H01M4/13H01M4/131H01M4/139H01M4/1391H01M10/0525H01M2300/0065Y02E60/10
Inventor 李峥何泓材周柯冯玉川陈凯杨帆
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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