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A preparation method of pre-intercalated lithium negative electrode sheet and the obtained pre-intercalated lithium negative electrode sheet

A negative electrode sheet, pre-lithium pre-insertion technology, applied in electrode manufacturing, electrode electrochemical treatment, electrode collector coating, etc. High crystallinity and the effect of reducing internal resistance

Active Publication Date: 2018-05-11
江西展枭新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a method for pre-intercalating lithium in the negative electrode, through the combination of physical pre-intercalation lithium and electrochemical pre-intercalation lithium, to make up for the inhomogeneity of microscopic lithium intercalation through physical pre-intercalation of lithium, and to solve the problem of electrochemical depth Pre-intercalation of lithium takes too long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of lithium ion capacitor negative electrode by coating method

[0036] 60% mass fraction of disordered hard carbon and 40% Li 2 TiO 3 After mixing, the lithium salt-containing active material mixture is obtained after being fully ground by a mechanical ball mill under an oxygen atmosphere.

[0037] Stir 80% active substance, 10% VGCF, and 10% PVDF in an appropriate amount of NMP for 12 hours.

[0038] Coated on copper foil with 50% porosity by coating method, then transferred to 85°C vacuum oven at constant temperature for 8 hours, and vacuumed every two hours to obtain physically pre-intercalated lithium with active material layer attached Negative plate.

[0039] (2) Electrochemical pre-intercalation of lithium

[0040] Put the prepared and uncompacted negative electrode sheet into a 1.5mol / L organic electrolyte, in which the solute is LiPF6, and the organic solvent is EC:EMC volume ratio=3:7, at 10C rate at 1.5V~3.8V Perform constant current char...

Embodiment 2

[0042] (1) Preparation of lithium ion capacitor negative electrode by coating method

[0043] 50% mass fraction of disordered soft carbon and 50% LiMn 2 o 4 After mixing, the active material is fully ground by a mechanical ball mill under an oxygen atmosphere to obtain a physically pre-intercalated lithium negative electrode sheet with an active material layer attached thereto.

[0044] Stir 75% active substance, 15% VGCF, and 10% PVDF in an appropriate amount of NMP for 12 hours.

[0045] Coating on copper foil with 30% porosity by coating method, and then transferring to 85°C vacuum drying oven for 8 hours, and vacuuming every two hours.

[0046] (2) Electrochemical pre-intercalation of lithium

[0047] Put the prepared and uncompacted negative electrode sheet into a 1.2mol / L organic electrolyte, in which the solute is LiPF6, and the organic solvent is EC:EMC volume ratio=3:7, at 1.5V~3.8V at a rate of 8C Perform constant current charging and discharging within the volta...

Embodiment 3

[0049] (1) Preparation of lithium ion capacitor negative electrode by coating method

[0050] 70% mass fraction of disordered soft carbon and 30% LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 After mixing, the active material is obtained after being fully ground by a mechanical ball mill under an oxygen atmosphere.

[0051] Stir 85% active substance, 10% VGCF, and 5% PVDF in an appropriate amount of NMP for 12 hours.

[0052] Coated on copper foil with 70% porosity by coating method, then transferred to 85°C vacuum oven at constant temperature for 8 hours, and vacuumed every two hours to obtain physically pre-intercalated lithium with active material layer attached Negative plate.

[0053] (2) Electrochemical pre-intercalation of lithium

[0054] Put the prepared and uncompacted negative electrode sheet into a 1.5mol / L organic electrolyte, in which the solute is LiPF6, the organic solvent is EC:EMC volume ratio=3:7, and the 12C rate is 1.5V~3.8V Perform constant current charge and dischar...

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Abstract

The invention discloses a preparation method of a lithium pre-embedded negative plate. The preparation method comprises the following steps of (1) attaching an active substance mixture containing a lithium salt onto a porous current collector by a physical method to form an active substance layer and obtain the negative plate with physically pre-embedded lithium; and (2) placing the negative plate with physically pre-embedded lithium obtained in the step (1) in an organic electrolyte containing a lithium salt for constant-current charging / discharging processing to obtain the negative electrode with electrochemically pre-embedded lithium. Through the combination of physically pre-embedded lithium and electrochemically pre-embedded lithium, the non-uniformity of micro lithium embedment through physically pre-embedded lithium is made up, and the problem of long time consumption by deep electrochemically pre-embedded lithium is solved.

Description

technical field [0001] The invention relates to a preparation method of a pre-embedded lithium negative electrode sheet and a negative electrode sheet obtained by the method, belonging to the field of energy storage devices. Background technique [0002] Energy storage devices that can be industrially produced mainly include lithium-ion batteries (LIB) and electric double-layer capacitors (EDLC, supercapacitors), which have been widely used. Lithium-ion batteries have the advantages of high energy density, but have the disadvantages of short service life and low power density. Supercapacitors have the advantages of high output power and long cycle life, but have the problem of low energy density. [0003] Lithium ion capacitor (LIC) adopts a hybrid structure of lithium ion battery and electric double layer capacitor, the positive electrode uses activated carbon, and the negative electrode uses graphite and other materials. It combines the high output and long life character...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/22H01G11/50H01G11/86H01M4/04
CPCH01G11/22H01G11/50H01G11/86H01M4/0404H01M4/0438Y02E60/10
Inventor 梁亚青廖运平闵凡奇
Owner 江西展枭新能源科技有限公司
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