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Chelated copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material as well as preparation method and application thereof

A cathode material and copolymer technology, which is applied in the field of chelating copolymer gel layer-coated nickel-cobalt-aluminum ternary cathode materials and its preparation, can solve the problems of interface impedance increase, battery performance loss, poor connectivity, etc., and achieve optimization High contact resistance, high capacity retention rate, and the effect of suppressing side reactions

Active Publication Date: 2019-07-26
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the thorny interface problem, on the one hand, the inherent space charge layer due to the poor connectivity of the active particles, and on the other hand, under a certain voltage, the harmful chemical reactions at the interface between the positive electrode and the electrolyte inevitably lead to an increase in the interfacial impedance, resulting in loss of battery performance

Method used

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  • Chelated copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material as well as preparation method and application thereof
  • Chelated copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material as well as preparation method and application thereof
  • Chelated copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A chelating copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material, made of LiNi 0.8 co 0.15 al 0.05 o 2 Active particles, chelating copolymer PVDF-GMA-IDA and bis(trifluoromethylsulfonyl) 1-ethyl-3-methylimidazole (EMITFSI) were prepared.

[0038] A kind of preparation method of the chelate copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material of the present embodiment, comprises the following steps

[0039] S1. Disperse the chelating copolymer and the ionic liquid in N-methylpyrrolidone (NMP) solvent, and stir evenly to obtain a polymer solution;

[0040] Take 0.003g chelating copolymer PVDF-GMA-IDA and 0.006g ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITFSI) and disperse in 8g NMP and magnetically stir for 0.5 hours to form a uniform polymerization substance solution.

[0041] The chelate copolymer in this example is obtained from polyvinylidene fluoride (PVDF), glyceryl me...

Embodiment 2

[0049] The chelate copolymer gel layer of the present embodiment coats nickel-cobalt-aluminum ternary positive electrode material, is made of LiNi 0.8 co 0.15 al 0.05 o 2 Active particles, chelating copolymer PVDF-GMA-IDA and bis(trifluoromethylsulfonyl) 1-ethyl-3-methylimidazole (EMITFSI) were prepared.

[0050] The preparation method of the chelate copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material of the present embodiment comprises the following steps:

[0051] S1. Take 0.0408g of chelating copolymer PVDF-GMA-IDA prepared in Example 1 and 0.0816g of ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITFSI) dispersed in 8g of NMP and Magnetic stirring was carried out for 0.5 h to form a homogeneous polymer solution.

[0052] S2, 2g LiNi 0.8 co 0.15 al 0.05 o 2 The powder was immersed in the polymer solution and stirred at 60 °C for 4 hours to induce the reaction between the gel polymer PVDF-GMA-IDA and the NCA ac...

Embodiment 3

[0054] The chelate copolymer gel layer of the present embodiment coats nickel-cobalt-aluminum ternary positive electrode material, is made of LiNi 0.8 co 0.15 al 0.05 o 2 Active particles, chelating copolymer PVDF-GMA-IDA and bis(trifluoromethylsulfonyl) 1-ethyl-3-methylimidazole (EMITFSI) were prepared.

[0055] The preparation method of the chelate copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material of the present embodiment comprises the following steps:

[0056] S1, 0.0619g chelating copolymer PVDF-GMA-IDA and 0.1237g ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITFSI) prepared in Example 1 were dispersed in 8g NMP and Magnetic stirring was carried out for 0.5 h to form a homogeneous polymer solution.

[0057] S2, 2g LiNi 0.8 co 0.15 al 0.05 o 2 The powder was immersed in the polymer solution and stirred at 60 °C for 4 hours to induce the reaction between the gel polymer PVDF-GMA-IDA and the NCA particles, ...

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Abstract

The invention provides a preparation method of a chelated copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material; the preparation method comprises the steps of S1, dispersing a chelating copolymer and an ionic liquid in an NMP solvent, and uniformly stirring to obtain a polymer solution; and S2, taking NCA active particles as a core, and adding the NCA active particles into the polymer solution, fully stirring and reacting, and carrying out drying to obtain the chelated copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material. The chelated copolymer gel layer coated nickel-cobalt-aluminum ternary positive electrode material can optimize the contact impedance between the NCA active particles and the interface impedance of a solid-state battery, and finally the cycling stability of the ternary solid-state battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials and preparation thereof, in particular to a chelating copolymer gel layer-coated nickel-cobalt-aluminum ternary positive electrode material and a preparation method and application thereof. Background technique [0002] With the development of portable electronic devices, electric vehicles and energy storage, large lithium-ion batteries with high specific energy, high safety and long cycle life become an urgent need. In terms of obtaining lithium-ion batteries with higher energy density, the development of higher voltage, higher specific capacity cathode materials has become a hot research topic. Compared with other cathode materials, LiNi 0.8 co 0.15 al 0.05 o 2 Ternary cathode materials are one of the widely used cathode materials due to their relatively high specific capacity, operating voltage platform and low cost. However, for conventional liquid batteries, the tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 郭青鹏韩喻王珲郑春满李宇杰洪晓斌许静李德湛谢凯
Owner NAT UNIV OF DEFENSE TECH
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