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Preparation method of cathode of secondary battery

A secondary battery and cathode technology, applied in electrode manufacturing, battery electrodes, positive electrodes, etc., can solve problems such as battery performance degradation, increased resistance, human health and environmental risks, etc.

Active Publication Date: 2021-04-16
上海钜领科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fluoropolymers increase electrical resistance, which can lead to poor battery performance and pose risks to human health and the environment

Method used

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  • Preparation method of cathode of secondary battery
  • Preparation method of cathode of secondary battery
  • Preparation method of cathode of secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0176] A) Preparation of positive electrode

[0177] 0.9 g of conductive agent (SuperP; from Timcal Ltd, Bodio, Switzerland) and 6 g of polyacrylamide (PAM) (15% solids content) were dispersed in 7.4 g of deionized water while stirring with an overhead stirrer (R20, IKA) , to prepare the first suspension. After the addition, the first suspension was further stirred at 1,200 rpm for about 30 minutes at 25°C.

[0178] Dissolve 0.02 g of LiOH with 100 g of deionized water at 25 °C to prepare a lithium aqueous solution with a LiOH concentration of 0.01 M. After the addition, the aqueous solution was further stirred at 25°C for about 5 minutes. Then, 7.5 g of the aqueous solution was added to the first suspension to prepare a second suspension. After the addition, the second suspension was further stirred at 25°C for about 30 minutes.

[0179] Afterwards, 28.2 g of NMC532 (from Shandong Tianjiao New Energy Co., Ltd., China) was added to the second suspension at 25°C while sti...

Embodiment 2

[0189] The method of preparing the positive electrode is the same as in Example 1, except that 0.12 g of LiOH is dissolved in 100 g of deionized water to prepare an aqueous solution with a LiOH concentration of 0.05 M, and the second suspension is prepared by adding 7.5 g of the aqueous solution to the first suspension. Two suspensions.

Embodiment 3

[0191] The method of preparing the positive electrode is the same as in Example 1, except that 1.20 g of LiOH is dissolved in 100 g of deionized water to prepare an aqueous solution with a LiOH concentration of 0.5 M, and the second suspension is prepared by adding 7.5 g of the aqueous solution to the first suspension. Two suspensions.

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Abstract

Provided herein is a preparation method of a cathode based on an aqueous slurry. The present invention provides a cathode slurry comprising a cathode active material, in particular a nickel-containing cathode active material, having improved stability in water. The nickel-containing cathode active material treated with a lithium compound may improve the stability of the cathode by preventing undesirable decomposition of the material. In addition, a battery including the cathode prepared by the method disclosed herein exhibits excellent electrochemical properties.

Description

technical field [0001] The invention relates to the field of batteries. In particular, the invention relates to methods of preparing cathodes for lithium-ion batteries. Background technique [0002] Over the past decades, lithium-ion batteries (LIBs) have been widely used in various applications, especially consumer electronics, due to their excellent energy density, long cycle life, and high discharge capacity. Due to the rapid market development of electric vehicles (EV) and grid energy storage, currently, high-performance, low-cost LIBs offer one of the most promising options for large-scale energy storage devices. [0003] The use of multiple lithium transition metal oxides such as lithium nickel manganese cobalt oxide (NMC) and lithium nickel cobalt aluminum oxide (NCA) has become popular because of its superior electrochemical properties compared to, for example, LiMnO 2 、LiCoO 2 and LiNiO 2 traditional cathode active materials. Excellent electrochemical propertie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/04
CPCY02E60/10H01M4/1391H01M10/052H01M4/0404H01M2004/028H01M4/131H01M4/62H01M4/366H01M4/625H01M4/505H01M4/525H01M4/628
Inventor 何锦镖江英凯
Owner 上海钜领科技有限公司