Preparation method of lithium-rich anode strip of lithium ion battery

A lithium-ion battery and anode sheet technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as ineffective control of lithium supplementation, poor cycle performance, and complicated processes, so as to achieve uniform lithium supplementation and increase energy density , The effect of simple process

Active Publication Date: 2013-01-02
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to: address the deficiencies of the prior art, and provide a method for preparing a lithium-rich anode sheet for a lithium-ion battery that has simple process, low cost, and can effectively control the amount and uniformity of lithium supplementation to the anode sheet , using this method can effectively improve the first Coulombic efficiency of the battery cell, thereby greatly improving the energy density of the battery cell, and at the same time can ensure the safety performance and cycle performance of the battery, so as to overcome the disadvantages of the lithium supplementation method in the prior art. Complicated, high cost, unable to effectively control the amount of lithium supplementation, insufficient safety, and may lead to poor cycle performance of the battery

Method used

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Examples

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Effect test

Embodiment 1

[0024] Example 1: This embodiment provides a method for preparing a lithium-rich anode sheet for a lithium-ion battery, which includes the following steps: Step 1, coating the anode slurry (including the anode active material, binder and conductive agent, etc., wherein the anode active material is graphite) Coating on the anode current collector, drying, so that the water content of the anode diaphragm does not exceed 300ppm, and the anode sheet to be supplemented with lithium is obtained.

[0025] Step 2: In the drying room, place the anode sheet to be supplemented with lithium prepared in the first step in the electrolyte (lithium salt concentration is 1mol / L), and after the anode diaphragm is fully infiltrated, put the anode diaphragm and The metal lithium strip is in double-channel contact. The contact temperature T is 10°C, the pressure P is 0, and the contact time is 10h, so that the lithium intercalation amount in the graphite is 5% of the total graphite capacity, and a...

Embodiment 2

[0026] Example 2:This embodiment provides a method for preparing a lithium-rich anode sheet for a lithium-ion battery, which includes the following steps: Step 1, coating the anode slurry (including the anode active material, binder and conductive agent, etc., wherein the anode active material is graphite) Coated on the anode current collector, dried so that the water content of the anode diaphragm does not exceed 300ppm, and cold pressed to obtain the anode sheet to be supplemented with lithium.

[0027] Step 2: In the drying room, place the anode sheet to be supplemented with lithium prepared in the first step in the electrolyte (lithium salt concentration is 0.1mol / L), and after the anode membrane is fully infiltrated, put the anode membrane The contact temperature T is 70°C, the pressure P is 0.2MPa, and the contact time is 2h, so that the lithium intercalation amount in the graphite is 15% of the total graphite capacity, and a lithium-rich anode sheet is obtained.

Embodiment 3

[0028] Example 3: This embodiment provides a method for preparing a lithium-rich anode sheet for a lithium-ion battery, including the following steps: Step 1, coating the anode slurry (including the anode active material, binder and conductive agent, etc., wherein the anode active material is silicon) Coated on the anode current collector, dried so that the water content of the anode diaphragm does not exceed 300ppm, and then cold pressed and slitting to obtain the anode sheet to be supplemented with lithium.

[0029] Step 2: In the drying room, place the anode sheet to be supplemented with lithium prepared in the first step in the electrolyte (lithium salt concentration is 2mol / L), and after the anode membrane is fully infiltrated, put the anode membrane and The metal lithium strip is in double-channel contact. The temperature T during contact is 150°C, the pressure P is 10MPa, and the contact time is 1min, so that the amount of lithium intercalated in silicon is 0.01% of th...

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Abstract

The invention belongs to the technical field of lithium ion batteries and especially relates to a preparation method of a lithium-rich anode strip of a lithium ion battery. The preparation method comprises the following steps of 1, coating anode slurry on an anode current collector and drying to obtain an anode strip which comprises an anode diaphragm and needs lithium supplement, and 2, wetting the anode strip needing lithium supplement by an electrolyte until the anode diaphragm is wetted fully, and carrying out dual-channel contact between the anode diaphragm and lithium metal to obtain a lithium-rich anode strip, wherein in contact, a temperature is in a range of 10 to 150 DEG C and pressure intensity is less than 100MPa and contact time is less than 10 hours. Compared with the prior art, the preparation method has the advantages that an ion channel and an electron channel between lithium metal and the anode diaphragm can be formed simultaneously; a potential difference between an anode material and lithium metal can promote fast ionization of lithium metal so that lithium ions are formed; and the formed lithium ions are transferred and embed into anode active substance particles so that fast lithium supplement is realized. The preparation method has simple processes and can realize industrial batch production easily.

Description

Technical field [0001] The present invention belongs to the field of lithium -ion battery technology, which specializes in a preparation method for a lithium -ion battery rich lithium anode. Background technique [0002] In 1991, Sony Corporation creatively adopted carbon materials as lithium -ion battery anode materials, which brought revolutionary changes to the field of lithium -ion battery.Since then, lithium -ion battery technology has developed rapidly, and it has been used in large quantities on mobile phones, cameras, laptops and other portable electrical appliances.Lithium -ion batteries have many advantages, such as high voltage, small volume, light quality, high quality, high ability, no memory effect, pollution -free, small self -discharge and long cycle life, etc., which are the ideal mobile electrical power supply and electric vehicles of the 21st century.Power and power storage stations. [0003] However, with the continuous development of portable electronic equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 方宏新游从辉徐延杰曹福彪张柏清
Owner DONGGUAN AMPEREX TECH
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