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Cathode slurry for lithium ion battery

一种锂离子电池、阴极活性材料的技术，应用在电池电极、非水电解质蓄电池电极、电极制造等方向，能够解决高能耗、高生产成本等问题

Active Publication Date: 2019-06-14
SHANGHAI JULING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will lead to high energy consumption and high production cost in large-scale battery production

Method used

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  • Cathode slurry for lithium ion battery
  • Cathode slurry for lithium ion battery
  • Cathode slurry for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] A) Preparation of cathode active material

[0127] Through the co-precipitation method followed by calcination at 850 °C, the granular cathode active material Li 1.02 Ni 0.35 mn 0.34 co 0.31 o 2 (NMC333). The calcined product was pulverized by a jet mill (LNJ-6A, from Mianyang Liuneng Powder Equipment Co., Ltd., Sichuan, China) for about 1 hour, followed by sieving through a 270-mesh sieve to obtain a cathode active material having a particle size D50 of about 42 μm .

[0128] B) Preparation of positive electrode slurry

[0129] By mixing 92wt.% of the cathode active material prepared by the above method, 4wt.% of carbon black (SuperP; from Timcal Ltd, Bodio, Switzerland) as a conductive agent and 4wt.% of polylidene as a binder material Vinyl fluoride (PVDF; 5130, from Solvay S.A., Belgium) (these substances are dispersed in N-methyl-2-pyrrolidone (NMP; purity ≥ 99%, Sigma-Aldrich, U.S.) containing 50wt.% and 50wt.% acetone (purity ≥ 99%, Sigma-Aldrich, U...

Embodiment 2

[0140] A) Preparation of cathode active material

[0141] Through the co-precipitation method followed by calcination at 900 °C, the granular cathode active material Li 0.98 mn 2.1 o 4 (LMO). The calcined product was pulverized by a jet mill for about 1 hour, followed by sieving through a 400-mesh sieve to obtain a cathode active material having a particle size D50 of about 15 μm.

[0142] B) Preparation of positive electrode slurry

[0143] By mixing 92wt.% of the cathode active material prepared by the above method, 3wt.% of carbon black (SuperP; from Timcal Ltd, Bodio, Switzerland) as a conductive agent and 1wt.% of CMC (BSH) as a binder material -12, DKSCo.Ltd., Japan), 2wt.% of SBR (AL-2001, NIPPON A&L INC., Japan) and 2wt.% of polyvinylidene fluoride (PVDF; 5130, from Solvay S.A., Belgium) (these materials are dispersed in a mixed solvent containing 50wt.% deionized water and 50wt.% ethanol to form a slurry with 50wt.% solid content), to prepare positive electrod...

Embodiment 3

[0147] A) Preparation of cathode active material

[0148] Through the co-precipitation method followed by calcination at 900 °C, the granular cathode active material Li 1.05 mn 1.94 o 4 (LMO). The calcined product was pulverized by a ball mill for about 1.5 hours, followed by sieving through a 325-mesh sieve to obtain a cathode active material having a particle size D50 of about 28 μm.

[0149] B) Preparation of positive electrode slurry

[0150] By mixing 94 wt.% of the cathode active material prepared by the above method, 3 wt.% of carbon black (SuperP; from Timcal Ltd, Bodio, Switzerland) as a conductive agent and 1.5 wt.% of polyacrylic acid as a binder material (PAA, #181285, from Sigma-Aldrich, USA) and 1.5wt.% polyacrylonitrile (LA 132, ChengduIndigo Power Sources Co., Ltd., China) (these materials were dispersed in deionized water to form .% solid content slurry), to prepare positive electrode slurry. The slurry was homogenized by means of a planetary stirrin...

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Abstract

Provided herein is a lithium-ion battery cathode slurry, comprising: a cathode active material, a conductive agent, a binder material, and a solvent, wherein the cathode active material has a particlesize D50 in the range from about 10 mu m to about 50 mu m, and wherein the slurry coated onto a current collector having a wet film thickness of about 100 mu m has a drying time of about 5 minutes orless under an environment having a temperature of about 60 DEG C to about 90 DEG C and a relative humidity of about 25% to about 40%. The cathode slurry disclosed herein has homogeneous ingredient dispersion and quick drying capability for making a lithium-ion battery with high quality and consistent performance. In addition, these properties of the cathode slurry increase productivity and reducethe cost of manufacturing lithium-ion batteries.

Description

technical field [0001] The present invention relates to electrode pastes. More specifically, the present invention relates to cathode slurries for lithium ion batteries. 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] In general, a lithium-ion battery includes a separator, cathode, and anode. 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 the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04
CPCH01M4/13H01M4/131H01M4/139H01M4/1391H01M4/621H01M10/0525H01M2004/021Y02E60/10H01M4/136H01M4/625H01M4/622H01M4/1397H01M4/0404H01M4/0471H01M4/623H01M4/663
Inventor 何锦镖王然石申培华
Owner SHANGHAI JULING TECH CO LTD