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Preparation device and process of lithium-rich anode for lithium ion battery

A technology for lithium-ion batteries and preparation devices, which is applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve problems such as hidden safety hazards for operators, low uniformity of lithium replenishment, and high environmental requirements, so as to improve production. Efficiency, improve the first efficiency, the effect of simple device structure

Active Publication Date: 2017-11-10
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly realized by electrostatic vibration, because lithium powder is very light, easy to float, and has high environmental requirements, in addition, lithium powder is flammable, which will cause great safety hazards to operators
Moreover, the price of this metal lithium powder is expensive, the efficiency of lithium supplementation is low, and the uniformity of lithium supplementation is not high

Method used

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  • Preparation device and process of lithium-rich anode for lithium ion battery
  • Preparation device and process of lithium-rich anode for lithium ion battery
  • Preparation device and process of lithium-rich anode for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The preparation process of the lithium-ion battery lithium-rich anode provided in this embodiment includes the following steps:

[0061] In the first step, in a drying room with a humidity of 0.5%, the diaphragm 15 and the copper foil with a thickness of 10um and an air permeability of 60cc / 200s are transferred from the diaphragm unwinding device and the metal foil unwinding device to the workbench 22 respectively, and The diaphragm 15 is located above the copper foil;

[0062] The second step is to fill the injection tank with a conductivity of 3mS / cm containing lithium salt LiPF 6 Then inject the electrolyte into the tank body 11, let it stand for 5 minutes, then lower the lithium source supply system, apply a pressure of 0.05 MPa to the diaphragm 15 and copper foil, and press the lithium band ring 61, diaphragm 15 and copper foil tightly , then the electroplating tank 2 is connected to the power supply, the current is 0.1C, the positive pole of the power supply is c...

Embodiment 2

[0066] Different from Example 1: the humidity of the drying room is 2%, the thickness of the diaphragm 15 is 20um, the air permeability is 100cc / 200s, the conductivity of the lithium salt is 4mS / cm, and the standing time is 20min. The pressure is 0.6MPa, the current of the power supply is 50C, the water content of the anode sheet 16 is 300ppm, the initial capacity is 1860mAh / g, and the pressure in the third step is 1T.

[0067] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0069] The difference from Example 1 is: the humidity of the drying room is 1%, the thickness of the diaphragm 15 is 15um, the air permeability is 80cc / 200s, the conductivity of the lithium salt is 3.5mS / cm, and the standing time is 10min, the second step The pressure is 0.3MPa, the current of the power supply is 30C, the water content of the anode sheet 16 is 200ppm, the initial capacity is 2260mAh / g, and the pressure in the third step is 0.6T.

[0070] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of a lithium ion battery, and particularly relates to a device for preparing a lithium-enriched anode of a lithium ion battery. The device comprises a support seat as well as a diaphragm unwinding device, a metallic foil unwinding device, an electroplating bath, a diaphragm winding device, an anode strip unwinding device, a press roller, an anode strip winding device and a metallic foil winding device which are sequentially arranged on the support seat, wherein the electroplating bath is connected with an electrolyte supply system through a pipeline, and further, a lithium source supply system is arranged above the electroplating bath. Compared with the prior art, through electroplating and extrusion transferring, firstly, lithium is uniformly electroplated on the surface of a metallic foil in the electroplating bath to form a lithium layer, and then the lithium layer is transferred to the surface of an anode strip under the rolling action of the press roller, so that uniform lithium supplementation of the anode strip is realized; meanwhile, the first-time efficiency of the battery can be improved after the lithium supplementation of the anode strip is performed; and besides, the invention further discloses a technology which adopts the device for preparing the lithium-enriched anode strip.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation device and process for lithium-rich anodes of lithium-ion batteries. Background technique [0002] In 1991, Sony Corporation of Japan creatively adopted carbon materials as the anode material of lithium-ion batteries, which brought revolutionary changes to the field of lithium-ion batteries. Due to the many advantages of lithium-ion batteries, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge and long cycle life, etc., its application in the field of mobile devices has been unprecedented. development, including mobile phones, video cameras, notebook computers, and other portable appliances. However, with the miniaturization, long-standby and multi-functionalization of portable electronic devices, these devices have higher and higher requirements on the energy densit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139
CPCH01M4/0435H01M4/0452H01M4/139Y02E60/10
Inventor 周华利游从辉徐延杰郭培培段栋方宏新
Owner DONGGUAN AMPEREX TECH