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Carbon nanotube conductive agent for lithium ion battery positive electrode material and preparation method of carbon nanotube conductive agent

A lithium-ion battery, carbon nanotube technology, applied in the directions of carbon nanotubes, battery electrodes, nanocarbons, etc., can solve the problems of poor conductivity and easy overcharge, and achieve the effects of improving stability, reducing damage and improving cycle life.

Inactive Publication Date: 2018-08-03
中国科学院苏州纳米技术与纳米仿生研究所南昌研究院
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Problems solved by technology

[0014] Aiming at the scientific problems of poor electrical conductivity and easy overcharging of lithium-ion battery positive electrode materials, the purpose of the present invention is to provide a carbon nanotube conductive agent for lithium-ion battery positive electrode materials and a preparation method thereof. The carbon nanotube conductive agent can protect the positive electrode. Material structure to improve the overall power density and cycle stability of lithium-ion batteries

Method used

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  • Carbon nanotube conductive agent for lithium ion battery positive electrode material and preparation method of carbon nanotube conductive agent
  • Carbon nanotube conductive agent for lithium ion battery positive electrode material and preparation method of carbon nanotube conductive agent
  • Carbon nanotube conductive agent for lithium ion battery positive electrode material and preparation method of carbon nanotube conductive agent

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Embodiment Construction

[0045] The present invention has prepared the conductive paste used to reduce the positive electrode resistivity of lithium-ion batteries, such as figure 1 It is the SEM picture of the conductive paste, which can not only improve the conductivity of the positive electrode material, but also protect the structure of the positive electrode material, and improve the overall power density and cycle stability of the lithium-ion battery.

[0046] Option One:

[0047] Step (1): First turn on the dehumidifier, adjust the indoor humidity to below 15%, fully dry the equipment and instruments used, and clean them with NMP;

[0048] Step (2): Weigh 920 g of NMP, add it to the stirring tank, add 20 g of PVP during the stirring process, turn on the ultrasonic wave, and after it is fully dissolved, add 15 g of 4-bromo-1,2-dimethyloxy Benzene, fully dissolved, then add 15 g of vinyl sulfite, after fully dissolved, add 15 g of tert-butylbenzene;

[0049] Step (3): Add 50g of CNTs to the mix...

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Abstract

The invention belongs to the field of composite material preparation, and particularly relates to a carbon nanotube conductive agent for a lithium ion battery positive electrode material and a preparation method of the carbon nanotube conductive agent. The preparation method comprises the following steps of (1) dispersing a dispersing agent, a stabilizer, an overcharge protection agent and a filmformation agent in a solvent in advance; (2) adding a carbon nanotube into the dispersing agent for full immersion; and (3) adding the mixture into a grinding machine for full grinding and dispersion.With the conductive agent prepared by the method, the conductivity of the positive electrode material can be improved, the stability of the positive electrode material also can be improved, and the cycle lifetime of the positive electrode material is prolonged.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a conductive slurry for positive electrodes of lithium-ion batteries. The conductive agent is mainly carbon nanotubes, specifically a carbon nanotube conductive agent for positive electrode materials of lithium-ion batteries and its preparation method. Background technique [0002] Lithium is the metal with the smallest mass among all simple substances, and its electrode potential is also the lowest. The battery composed of lithium has the characteristics of high operating voltage, high mass specific capacity and large specific energy. Metal oxide lithium-ion batteries are currently the most widely used battery type. The performance of the positive electrode active material is the core factor for the energy density and power density of lithium-ion batteries. [0003] Lithium-ion battery cathode materials are mainly lithium cobalt oxide, lithium nickel oxide, lithium manganese...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525C01B32/158C01B32/16
CPCC01B32/158C01B32/16H01M4/625H01M10/0525Y02E60/10
Inventor 张永毅谢宇海冯智富吴茂玲方爱金张亦弛
Owner 中国科学院苏州纳米技术与纳米仿生研究所南昌研究院
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