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MXene nanodot coated and modified lithium ion battery positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve the problems of difficult micron-sized MXene material coating, etc., to improve rate performance, increase capacity retention rate, and improve cycle time performance effect

Active Publication Date: 2021-01-15
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional MXene material is a two-dimensional lamellar structure with a micron size, and most lithium-ion battery cathode materials are also micron-sized, so it is difficult to coat the surface of the positive electrode material with a micron-sized MXene material

Method used

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  • MXene nanodot coated and modified lithium ion battery positive electrode material and preparation method thereof
  • MXene nanodot coated and modified lithium ion battery positive electrode material and preparation method thereof
  • MXene nanodot coated and modified lithium ion battery positive electrode material and preparation method thereof

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Embodiment 1

[0028] According to the molar ratio Ti:Al:C=3:1:2, mix Ti, Al, and graphite powder, ball mill for 2 hours to mix the raw materials, and then sinter the raw materials by vacuum hot pressing to prepare Ti 3 AlC 2 MAX phase, the sintering temperature used is 1300℃, the sintering time is 3h, and the vacuum degree is 6.5×10 -3 Pa. Then, use 48% HF solution to etch away the Ti 3 AlC 2 Al element in the MAX phase, resulting in micron-sized Ti 3 C 2 MXene nanosheet material. Afterwards, the Ti 3 C 2 MXene nanosheets tailored into Ti 3 C 2 MXene nano-dot material, the temperature of the hydrothermal reaction is 140°C, the reaction time is 4h, the dispersion liquid obtained after the reaction is centrifugally washed with deionized water for 3-8 times, and Ti 3 C 2 MXene nanodot materials.

[0029] Prepare 10 mL of oligochitosan aqueous solution with a concentration of 0.6 mg / mL, adjust the pH to 4.5 by adding acetic acid, and then add 10 mg of Ti 3 C 2 MXene nanodot...

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Abstract

The invention discloses an MXene nanodot coated and modified lithium ion battery positive electrode material and a preparation method thereof, the MXene nanodot coated and modified lithium ion batterypositive electrode material is composed of an MXene nanodot material and a lithium ion battery positive electrode material, and the MXene nanodot material coats the surface of the lithium ion batterypositive electrode material. The particle size of the MXene nanodot material is 3-20 nm, the coating amount of the MXene nanodots accounts for 0.5-10% of the total mass of the MXene nanodots and thelithium ion battery positive electrode material, and the MXene nanodot coated and modified lithium ion battery positive electrode material prepared by the method significantly improves the electronicconductivity of the material, improves the capacity and rate performance of the material, and improves stability of the material; meanwhile, stability of an electrode electrolysis interface can be remarkably improved, and the cycle performance of the material is improved.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a lithium-ion battery cathode material coated and modified by MXene nano-dots and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, high power density, high energy density, and high voltage platform. They have been widely used in mobile phones, laptop computers and other electronic products, but it is still difficult to meet the requirements of electric vehicles, electric tools and other products. and cycle performance requirements. Cathode material is a key factor affecting battery performance. [0003] In order to improve the cycle stability of lithium-ion battery cathode materials (NCA), researchers usually use methods such as surface coating to avoid direct contact between the electrolyte of the material. The coating layer is usually an electrochemically inert oxide, phosphate, etc. And fluoride, howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/485H01M4/525H01M4/626H01M10/0525H01M2004/028Y02E60/10
Inventor 贺晓书周凌朱有明黄智明陈昭宇张绍延
Owner NANCHANG HANGKONG UNIVERSITY
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