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Preparation method of fast ion conductor and conducting polymer dual-modified ternary cathode material for lithium-ion battery

A conductive polymer, lithium-ion battery technology, used in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as easy coating unevenness, difficult to determine components, etc., to reduce morphology damage, low cost, and operation. simple steps

Active Publication Date: 2018-02-16
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vanadium contains a variety of valence states, it is difficult to determine the composition of the synthesis, and it is easy to coat unevenly

Method used

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  • Preparation method of fast ion conductor and conducting polymer dual-modified ternary cathode material for lithium-ion battery
  • Preparation method of fast ion conductor and conducting polymer dual-modified ternary cathode material for lithium-ion battery
  • Preparation method of fast ion conductor and conducting polymer dual-modified ternary cathode material for lithium-ion battery

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Experimental program
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Effect test

Embodiment 1

[0035] will Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor and LiOH·H 2 O is mixed at a molar ratio of 1:1.07 and then fully ground, heated at a rate of 5°C / min in an oxygen atmosphere, and calcined at a high temperature of 750°C for 15 hours to finally obtain a lithium-ion battery LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material. Then weigh V according to the coating amount of 3wt.% 2 o 5 , the LiOH·H 2 O and V 2 o 5 Mix and grind for 10 minutes at a molar ratio of 3:1 to make V 2 o 5 The reaction completely generates lithium vanadate, then add LiNi 0.8 co 0.1 mn 0.1 o 2 Continue to grind the positive electrode material for 30 minutes until the generated lithium vanadate has no obvious agglomeration phenomenon, so that it can fully react and evenly adhere to the surface of the positive electrode material. The fully ground material is calcined at 700°C for 8 hours by high-temperature calcination method to obtain the fast ion conductor vanadium Lithium acid modified lithium...

Embodiment 2

[0038] LiOH·H 2 O ball milled for 30min to 1-20 micron, then Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor and LiOH·H 2 O was mixed evenly at a molar ratio of 1:1.05, and calcined at 780°C for 15 hours at a heating rate of 5°C / min in an oxygen atmosphere to obtain a lithium-ion battery LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material. Then weigh V according to the coating amount of 1wt.%. 2 o 5 , the LiOH·H 2 O and V 2 o 5 Mix and grind for 10 minutes at a molar ratio of 3:1 to make V 2 o 5 The reaction completely generates lithium vanadate, add LiNi 0.8 co 0.1 mn 0.1 o 2 Continue to grind the positive electrode material for 30 minutes to mix the generated lithium vanadate with the positive electrode material evenly so that the reaction is sufficient and evenly attached to the surface of the positive electrode material. The fully ground material is calcined at 700°C for 8 hours by high-temperature calcination to obtain lithium vanadate Modified lithium ion battery LiNi ...

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Abstract

The invention discloses a preparation method of a fast ion conductor and conducting polymer dual-modified ternary cathode material for a lithium-ion battery. According to the material, a ternary cathode material for a lithium-ion battery is taken as a core, a fast ion conductor is taken as a first coating layer, a conducting polymer is taken as a second coating layer and the fast ion conductor isany one of lithium vanadate, lithium metaaluminate and lithium zirconate. The fast ion conductor and the ternary cathode material are firstly mixed evenly and ground; the ternary cathode material is coated with the fast ion conductor by using a high-temperature solid state method; the conducting polymer and the ternary cathode material coated with the fast ion conductor are mixed evenly and milled; and the ternary cathode material coated with the fast ion conductor is coated with the conducting polymer to finally obtain the fast ion conductor and conducting polymer dual-modified ternary cathode material for the lithium-ion battery. The fast ion conductor is combined with the conducting polymer to modify the ternary cathode material, so that the ternary cathode material has excellent cycleperformance and good rate capability.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion battery materials, in particular to a preparation method of a lithium ion battery ternary cathode material double-modified by a fast ion conductor and a conductive polymer. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and wide operating range, so they are in great demand and attract attention in the fields of portable electronic devices, electric vehicles, and space technology. With the increasing market demand for the cruising range of electric vehicles, lithium-ion batteries are required to have higher energy density, safety performance and rate performance. However, the energy density of currently marketed cathode materials is relatively low, which limits their promotion in some fields. Therefore, improving the specific capacity and rate performance of ternary cathode materials for lithium-ion batteries has become a r...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 宋刘斌唐福利肖忠良李灵均刘姣李新宇
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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