Lithium ion battery cathode plate, lithium ion battery and preparation method of lithium ion battery

A lithium-ion battery and cathode sheet technology, which is applied in non-aqueous electrolyte battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as side reactions, very high process requirements, and graphite peeling, and achieve Effects of reducing consumption, improving cycle performance, and reducing irreversible capacity

Active Publication Date: 2013-12-11
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, supplementing the anode with lithium will bring many problems, such as the exfoliation of graphite
In addition, after adding lithium, the potential of the pole piece will drop to 0V, which is easy to cause many side reactions, and the use of lithium metal has very high requirements for the process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of lithium ion battery, it comprises the following steps:

[0026] (1) Will Li 2 C 4 o 4 , cathode active material LiCoO 2 , the conductive agent Super P (conductive carbon, SP), and the binder PVDF are dissolved in the solvent NMP at a weight ratio of 5:85:5:5, and a uniform slurry is obtained by stirring, and then the slurry is evenly coated on the cathode On the aluminum foil of the current collector, the Li 2 C 4 o 4 the cathode sheet;

[0027] (2) The cathode sheet in step (1), the anode sheet with the anode diaphragm made of artificial graphite: SP: CMC: SBR = 96.5: 1: 1: 1.5, and the PP / PE / PP three-layer separator Winding to obtain lithium-ion batteries;

[0028] (3) Put lithium-ion cells into the battery package and inject 1mol / L of EC:EMC:DEC=1:1:1, electrolyte containing 2%VC and 3%PS; C is charged to 3.4V, then charged to 3.85V at 0.1C, then charged to 4.2V at 0.2C, and then charged at 4.2V for 2 hours. At this time, Li 2 C 4 o...

Embodiment 2

[0030] A preparation method of lithium ion battery, it comprises the following steps:

[0031] (1) LiN 3 , cathode active material LiCoO 2 , the conductive agent Super P (conductive carbon, SP), and the binder PVDF are dissolved in the solvent NMP at a weight ratio of 5:85:5:5, and a uniform slurry is obtained by stirring, and then the slurry is evenly coated on the cathode On the aluminum foil of the current collector, after cold pressing and slitting, the LiN-containing 3 the cathode sheet;

[0032] (2) The cathode sheet in step (1), the anode sheet with the anode diaphragm made of artificial graphite: SP: CMC: SBR = 96.5: 1: 1: 1.5, and the PP / PE / PP three-layer separator Winding to obtain lithium-ion batteries;

[0033] (3) Put lithium-ion cells into the battery package and inject 1mol / L of EC:EMC:DEC=1:1:1, electrolyte containing 2%VC and 3%PS; C is charged to 3.4V, then charged to 3.6V at 0.1C, and then charged at 3.6V for 2 hours; at this time, LiN 3 Decomposition ...

Embodiment 3

[0035] A preparation method of lithium ion battery, it comprises the following steps:

[0036] (1) Will Li 2 C 3 o 5 , cathode active material LiCoO 2 , the conductive agent Super P (conductive carbon, SP), and the binder PVDF are dissolved in the solvent NMP at a weight ratio of 10:80:5:5, and a uniform slurry is obtained by stirring, and then the slurry is evenly coated on the cathode On the aluminum foil of the current collector, after cold pressing and slitting, the Li 2 C 3 o 5 the cathode sheet;

[0037] (2) The cathode sheet in step (1), the anode sheet with an anode diaphragm made of artificial graphite: SP: CMC: SBR = 96.5: 1: 1: 1.5, PP / PE / PP three-layer separator Winding to obtain lithium-ion batteries;

[0038] (3) Put lithium-ion cells into the battery package and inject 1mol / L of EC:EMC:DEC=1:1:1, electrolyte containing 2%VC and 3%PS; C is charged to 3.4V, then charged to 3.85V at 0.1C, then charged to 4.5V at 0.2C, and then charged at 4.5V for 2 hours. ...

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PUM

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Abstract

The invention discloses a lithium ion battery cathode plate. The lithium ion battery cathode plate comprises a cathode current collector and a cathode active material layer, wherein the cathode active material layer is distributed on the cathode current collector and contains a cathode active material, a conductive agent, an adhesive agent and a lithium compound; the lithium compound is decomposed to release lithium and gas in the formation and charging processes of a lithium ion battery. The lithium compound serves as a lithium supplementation material, a cathode potential is unchanged, the lithium compound is decomposed only in the formation and charging processes, the gas generated by decomposition can be removed in the formation process, the lithium generated by decomposition is transferred from a cathode to an anode in the charging process, a solid electrolyte inter-phase (SEI) membrane is formed on the anode, and the lithium required by forming of the SEI membrane is supplemented. Therefore, the consumption of cathode lithium ions can be reduced, the irreversible capacity of the lithium ion battery is reduced, and the cycle performance of the lithium ion battery is improved. The invention also discloses the lithium ion battery with the lithium ion battery cathode plate and a preparation method of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries. More specifically, the invention relates to a lithium ion battery cathode sheet, a lithium ion battery using the lithium ion battery cathode sheet and a preparation method thereof. Background technique [0002] Typically, lithium-ion battery systems are assembled in a discharged state, so only lithium ions are stored at the positive electrode. However, for anode materials with potentials lower than 0.8V such as silicon and graphite, about 5%-10% of lithium will be consumed due to the formation of an SEI film during cycling, which means that there will be corresponding cathode materials that will contribute A dead material that does not contribute to the cycling of lithium ions. [0003] The capacity of the positive electrode material is generally 120-160mAh / g, the capacity of graphite can reach 360mAh / g, and the theoretical capacity of silicon is 4200mAh / g. It consumes more lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525H01M10/42H01M10/0587
CPCY02E60/10Y02P70/50
Inventor 闫传苗钟开富王宝君赵丰刚
Owner DONGGUAN AMPEREX TECH
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