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Polymer and nitrogen-doped carbon nanotube co-modified nickel-cobalt-manganese cathode material and preparation method thereof

A positive electrode material, nitrogen-doped carbon technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of inability to improve the electrical conductivity of materials, poor cycle stability, and reduce surface impedance, so as to improve the structure Stability and cycle performance, excellent structural stability and cycle performance, and anti-corrosion effect

Active Publication Date: 2019-01-18
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some disadvantages in high-nickel ternary materials: low electrical conductivity; Li / Ni mixed discharge leads to poor rate performance; phase transition is easy to occur under high pressure cycle, resulting in poor cycle stability; Ni in high delithiation state 4+ The strong oxidizing property tends to reduce to Ni 3+ while releasing O 2 poor thermal stability
Although the metal oxide coating can resist HF corrosion and reduce the surface resistance, it cannot improve the conductivity of the material

Method used

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  • Polymer and nitrogen-doped carbon nanotube co-modified nickel-cobalt-manganese cathode material and preparation method thereof
  • Polymer and nitrogen-doped carbon nanotube co-modified nickel-cobalt-manganese cathode material and preparation method thereof
  • Polymer and nitrogen-doped carbon nanotube co-modified nickel-cobalt-manganese cathode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] A polymer and nitrogen-doped carbon nanotube co-modified nickel-cobalt-manganese positive electrode material and a preparation method thereof. The steps of the preparation method described in this embodiment are

[0026] Step 1, according to the concentration of 0.2 ~ 0.25kg / m 3 , Add the ion-conducting polymer into acetone, stir until dissolved, and obtain solution I.

[0027] Step 2. According to the mass ratio of the ion-conducting polymer to the nickel-cobalt-manganese positive electrode material being 1: (100-102), the nickel-cobalt-manganese positive electrode material is added to the solution I, and the Stir at room temperature for 4-6 hours, then continue to stir in a water bath at 60-80°C until the acetone evaporates, then dry at 80-100°C and 200-500Pa for 24-48 hours to obtain a polymer coating nickel-cobalt-manganese cathode material. The polymer-coated nickel-cobalt-manganese cathode material is denoted as p-NCM.

[0028] Step 3, according to the concent...

Embodiment 2

[0034] A polymer and nitrogen-doped carbon nanotube co-modified nickel-cobalt-manganese positive electrode material and a preparation method thereof. The steps of the preparation method described in this embodiment are

[0035] Step 1, according to the concentration of 0.25 ~ 0.3kg / m 3 , Add the ion-conducting polymer into acetone, stir until dissolved, and obtain solution I.

[0036]Step 2. According to the mass ratio of the ion-conducting polymer to the nickel-cobalt-manganese positive electrode material being 1: (102 to 104), the nickel-cobalt-manganese positive electrode material is added to the solution I, and at 100 to 150 rpm Stir at room temperature for 4-6 hours, then continue to stir in a water bath at 60-80°C until the acetone evaporates, then dry at 80-100°C and 200-500Pa for 24-48 hours to obtain a polymer coating nickel-cobalt-manganese cathode material. The polymer-coated nickel-cobalt-manganese cathode material is denoted as p-NCM.

[0037] Step 3, accordin...

Embodiment 3

[0043] A polymer and nitrogen-doped carbon nanotube co-modified nickel-cobalt-manganese positive electrode material and a preparation method thereof. The steps of the preparation method described in this embodiment are

[0044] Step 1, according to the concentration of 0.3 ~ 0.35kg / m 3 , Add the ion-conducting polymer into acetone, stir until dissolved, and obtain solution I.

[0045] Step 2. According to the mass ratio of the ion-conducting polymer to the nickel-cobalt-manganese positive electrode material being 1: (104-106), the nickel-cobalt-manganese positive electrode material is added to the solution I, and the Stir at room temperature for 4-6 hours, then continue to stir in a water bath at 60-80°C until the acetone evaporates, then dry at 80-100°C and 200-500Pa for 24-48 hours to obtain a polymer coating nickel-cobalt-manganese cathode material. The polymer-coated nickel-cobalt-manganese cathode material is denoted as p-NCM.

[0046] Step 3, according to the concent...

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Abstract

The invention relates to a polymer and nitrogen-doped carbon nanotube co-modified nickel-cobalt-manganese cathode material and a preparation method thereof, wherein the technical scheme is that an ionic conductive polymer is added into acetone according to a concentration of 0.2-0.4 kg / m3 to obtain solution I. According to the mass ratio of ionic conductive polymer to Ni-Co-Mn cathode material is1: (100-110), Ni-Co-Mn cathode material is added into solution I, stirred and dried to obtain polymer coated Ni-Co-Mn cathode material (denoted as p-NCM). Nitrogen-doped carbon nanotubes were added into tert-butanol at the concentration of 2- 5kg / m3 to obtain solution II. At a concentration of 40-45 kg / m3, p-NCM is added the soultuion II to obtain the solution III. Ni-Co-Mn cathode material modified by polymer and nitrogen-doped carbon nanotubes was prepared by freeze-drying the spherical beads obtained by dropping solution III into liquid nitrogen. The invention has the advantages of simpleprocess, easy industrial production, excellent rate performance, structural stability and recycling performance of the prepared product.

Description

technical field [0001] The invention belongs to the technical field of nickel-cobalt-manganese cathode materials. In particular, it relates to a nickel-cobalt-manganese positive electrode material co-modified by a polymer and nitrogen-doped carbon nanotubes and a preparation method thereof. Background technique [0002] Lithium battery cathode materials include lithium cobaltate, lithium manganate, lithium nickelate, lithium iron phosphate and ternary materials. The safety and cycle life of lithium iron phosphate are good, but the tap density is small, and the rate performance of the battery, especially at low temperature, is poor; lithium manganate has the advantages of low cost and high rate performance, but the high temperature cycle and storage performance are poor; Lithium cobalt oxide has good structural stability and high energy density, but it is expensive, limited in capacity, scarce in resources and poor in safety. The layered nickel-cobalt-manganese ternary mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 周盈科朱彦斌吴关田小慧黄肖
Owner WUHAN UNIV OF SCI & TECH
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