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Method of drying electrode assemblies

一种电极组件、干燥的技术，应用在电池组零部件、电极制造、电气元件等方向，能够解决影响LIB循环稳定性和倍率特性、没有公开粘结剂组合物、没有提供干燥的电极组件含水量等问题

Active Publication Date: 2018-04-03
SHANGHAI JULING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not provide the moisture content of the dried electrode assembly for evaluating the drying process
[0009] None of the above patent documents disclose any binder composition in the electrode for evaluating the relationship between the drying curve and the binder composition
In addition, the water content of the electrode assembly dried by the existing method is between one hundred ppm and several hundred ppm, which will affect the cycle stability and rate characteristics of LIB.

Method used

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  • Method of drying electrode assemblies
  • Method of drying electrode assemblies
  • Method of drying electrode assemblies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] A) Preparation of positive electrode slurry

[0144] By mixing 94wt.% of cathode material (LNMC TLM 310 from Xinxiang Tianli Energy Co., Ltd., China), 3wt.% of carbon black as a conductive agent (SuperP; from Timcal Ltd, Bodio, Switzerland) and as a binder 0.8wt.% of polyacrylic acid (PAA, #181285, from Sigma-Aldrich, USA), 1.5wt.% of styrene-butadiene rubber (SBR, AL-2001, from NIPPONA&L INC., Japan) and 0.7wt.% of Polyvinylidene fluoride (PVDF; 5130, from Solvay S.A., Belgium) (these materials were dispersed in deionized water to form a slurry with a solid content of 50 wt.%) to prepare positive electrode slurry. The slurry was homogenized by means of a planetary stirring mixer.

[0145] B) Preparation of positive electrode

[0146] The homogenized slurry was coated on an aluminum foil having a thickness of 20 μm and a surface roughness Ra of 5.5 μm using a transfer coater (ZY-TSF6-6518 from Jinfan Zhanyu New Energy Technology Co., Ltd., China) on both sides,...

Embodiment 2

[0150] Assembly of Electrode Assembly

[0151] After drying, the obtained cathode sheet and anode sheet of Example 1 were used to prepare a cathode and an anode, respectively, by cutting into individual electrode plates. An electrode assembly was prepared by stacking an anode, a cathode, and a separator interposed between the positive and negative electrodes under an open air without controlled humidity. The separator is a microporous film made of PET non-woven fabric (from MITSUBISHI PAPERMILLS LTD, Japan), the thickness of which is 30 μm. During the first drying stage, the electrode assembly was dried in a vacuum oven at 5 × 10 3 It was dried at a pressure of Pa and a temperature of 70° C. for 2.5 hours. During the second drying stage, the electrode assembly was at 5 × 10 3 It was further dried for 1.5 hours under a vacuum of Pa and a temperature of 120°C. The drying chamber was then filled with hot dry air with a moisture content of 5 ppm and a temperature of 90°C. T...

Embodiment 3

[0164] A) Preparation of positive electrode slurry

[0165] By mixing 92wt.% cathode material (LiMn 2 o 4 , from HuaGuan HengYuan LiTech Co., Ltd., Qingdao, China), 4wt.% of carbon black as a conductive agent (SuperP; from Timcal Ltd, Bodio, Switzerland) and 4wt.% of polyvinylidene fluoride as a binder ( PVDF; 5130, from Solvay S.A., Belgium) (these materials were dispersed in N-methyl-2-pyrrolidone (NMP; 99% of purity, Sigma-Aldrich, USA) to form a slurry with 50 wt.% solids content), to prepare positive electrode slurry. The slurry was homogenized by means of a planetary stirring mixer.

[0166] B) Preparation of positive electrode

[0167] The homogenized slurry was coated on both sides of an aluminum foil having a thickness of 20 μm with an areal density of about 2.4 mg / cm using a transfer coater 2 . The coating film on the aluminum foil was dried for 6 minutes by a 24-meter-long conveyor-type hot-air drying oven operating at a conveyor speed of about 4 m / min a...

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Abstract

Provided herein is a method of drying an electrode assembly of lithium-ion battery, comprising drying the electrode assembly in two successive stages under vacuum at elevated temperature; filling theoven with hot, dry air or inert gas; repeating the steps of vacuum drying and gas filling several times. The method disclosed herein is particularly suitable for drying electrode assemblies using aqueous binders.

Description

technical field [0001] The invention relates to the field of batteries. In particular, the present invention relates to methods for drying electrode assemblies of lithium ion batteries and electrode assemblies made by the methods disclosed herein. Background technique [0002] Over the past two decades, lithium-ion batteries (LIBs) have attracted considerable attention for their widespread use in portable electronic devices such as mobile phones and notebook computers. Due to the rapid market development of electric vehicles (EV) and grid energy storage, high-performance, low-cost LIBs currently offer one of the most promising options for large-scale energy storage devices. [0003] Currently, electrodes are prepared by dispersing fine powders of the active battery electrode material, conductive agent and binder material in a suitable solvent. The dispersion can be coated on a current collector such as copper or aluminum foil and then dried at high temperature to remove th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139F26B9/06F26B5/04F26B21/10F26B21/14F26B25/00H01M50/417H01M50/489
CPCF26B5/04F26B9/06F26B21/10F26B21/14F26B25/00H01M4/139H01M50/417H01M50/489H01M10/058H01M4/0471H01M4/623H01M4/622H01M10/0525H01M4/0404F26B5/042Y02E60/10H01M50/44Y02P70/50F26B3/04
Inventor 何锦镖王然石申培华
Owner SHANGHAI JULING TECH CO LTD