Lithium-ion battery pole piece pre-lithiating device

A lithium-ion battery, pre-lithiation technology, applied in the direction of battery electrodes, electrochemical treatment of electrodes, electrode manufacturing, etc., can solve the problems of uneven pre-lithiation, easy bending, damage and powder drop, etc., to achieve specific energy and cycle Improved performance, high production reliability, and high first-time efficiency

Pending Publication Date: 2019-10-15
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a disadvantage is that the production efficiency is low, it needs to be put in, infiltrated, charged, taken out, and put in again, and cannot be continuously produced; after cutting the pole piece, multiple corners are formed, which is easy to carry, put in / out the electrolytic cell, The powder is damaged during the drying process; the pole piece is directly placed in the solution, and the front and rear are not fixed, and the distance between the pole piece and the counter electrode is difficult to control; when the pole piece is large in size, it is easy to bend, curl, and prone to uneven current distribution leading to pre-set The problem of uneven lithiation

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0062] Preparation of the positive electrode sheet: the weight ratio of lithium cobaltate (LCO), PVDF, and Super-P is 96:2:2, stirring and pulping, coating the positive electrode slurry on both sides of the positive electrode current collector, and drying , compaction, slitting, and cutting into pieces to obtain the positive pole piece.

[0063] Preparation of negative electrode sheet: negative active material artificial graphite (or containing silicon, silicon alloy, silicon carbon composite, silicon oxide, or tin, tin alloy, tin oxide), styrene-butadiene rubber (SBR), carboxymethyl fiber Sodium plain (CMC), according to the required weight such as 96:2:2, add deionized water to stir and homogenate to make negative electrode slurry; the negative electrode slurry is double-sided coated on the negative electrode current collector, and coated into figure 2 Structure, with empty foil on one or both sides, the design capacity per unit area is 25Ah / m 2 , after drying, compacting, ...

Embodiment 1

[0080] Preparation of negative electrode sheet: Negative active materials artificial graphite, styrene-butadiene rubber (SBR), sodium carboxymethyl cellulose (CMC), according to the required weight, such as 96:2:2, add deionized water and stir to make negative electrode slurry material; the negative electrode slurry is coated on both sides on the negative electrode current collector, and the design capacity per unit area of ​​one side is 25Ah / m 2 , after drying, compacting, and slitting, the width of the active material after slitting is 71mm, and the pre-lithiation is performed, and the negative electrode sheet is obtained after the pre-lithiation and cutting into pieces.

[0081] Pre-lithiation process: the current through the first current and voltage control device C1 and the second current and voltage control device C2 is 6A, the width of the active material of the electrode pole piece is 71mm, and the operating linear speed of the electrode pole piece in the A3 module is ...

Embodiment 2

[0084] Preparation of negative electrode sheet: Negative active material artificial graphite, silicon oxide negative material, styrene-butadiene rubber (SBR), sodium carboxymethyl cellulose (CMC), add deionized water according to the required weight such as 40:56:2:2 Stir and homogenize to make negative electrode slurry; apply the negative electrode slurry on the negative electrode current collector on both sides, and the design capacity per unit area of ​​one side is 25Ah / m 2 , after drying, compacting, and slitting, the width of the active material after slitting is 71mm, and the pre-lithiation is performed, and the negative electrode sheet is obtained after the pre-lithiation and cutting into pieces.

[0085] Pre-lithiation process: the current through the first current and voltage control device C1 and the second current and voltage control device C2 is 6A, the width of the active material of the electrode pole piece is 71mm, and the operating linear speed of the control el...

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Abstract

The invention discloses a lithium-ion battery pole piece pre-lithiating device, comprising an unwinding module, a pre-soaking module, a pre-lithiating module, a cleaning module, a drying module and awinding module which are connected in turn. By employing a wet electrochemistry method, the device can complete roll-to-roll continuous pre-supplement of lithium to lithium-ion battery pole pieces. The device has high production efficiency and high production reliability, and pole pieces are not easy to be damaged by touch. The amount of lithium supplemented can be precisely controlled and adjusted according to the current and the movement speed of pole pieces, and the device is suitable for large-scale production. The lithium supplement device is suitable for pole pieces made of all kinds ofmaterials, and is compatible with many lithium-ion battery preparation processes, such as multi-tab winding, full-tad winding and laminating. A lithium-ion battery prepared from pole pieces pre-lithiated by the device has higher first efficiency and significantly improved capacity, specific energy and cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a lithium-ion battery pole piece pre-lithiation device. Background technique [0002] Lithium-ion secondary batteries have the advantages of high voltage and high energy density, and are widely used in power supplies for consumer electronics, energy storage systems, and power systems. Improving the energy density of lithium-ion batteries has always been the most concerned by the industry and academia question. [0003] During the first charging process of the battery, a surface solid electrolyte film (SEI film) is formed on the surface of the positive and negative electrodes, which will consume lithium and irreversibly solidify lithium into lithium carbonate, alkoxide, ester salt, etc., resulting in reversible lithium Loss, reduce the first efficiency, reduce the battery discharge capacity. Especially when some high-capacity new negative electrode active...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/04H01M10/0525
CPCH01M4/0438H01M4/1393H01M10/0525Y02E60/10
Inventor 翟传鑫严涛张明慧徐子福王雁
Owner 安普瑞斯(无锡)有限公司
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