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Preparation method and application of solid-state electrolyte-coated modified lithium ion battery positive electrode material

A solid-state electrolyte, lithium-ion battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of difficult ultra-thin coating control, rate performance limitations, rough coating effect, etc., to promote lithium ion transport. , The effect of reducing dissolution loss and inhibiting side reactions

Active Publication Date: 2018-02-09
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the existing preparation methods of coated modified lithium-ion battery cathode materials mainly include high-energy ball milling method, sol-gel method, etc., such as Chinese patent CN101950803A, which has problems such as rough coating effect and difficult control of ultra-thin coating, although The service life of the cathode material is improved, but the capacity and rate performance of the cathode material are limited

Method used

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  • Preparation method and application of solid-state electrolyte-coated modified lithium ion battery positive electrode material
  • Preparation method and application of solid-state electrolyte-coated modified lithium ion battery positive electrode material
  • Preparation method and application of solid-state electrolyte-coated modified lithium ion battery positive electrode material

Examples

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Effect test

Embodiment 1

[0033] (1) put C 9 h 21 o 3 Al and CH 2Disperse OLi in ethanol, then add an appropriate amount of stabilizer dropwise (stabilizer: ethanol volume ratio: 3:2000), and stir for 1 hour to obtain aluminum metalithium sol;

[0034] (2) Take 0.3 g of cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 Add the above-mentioned sol, transfer it to the inner lining of the polytetrafluoroethylene reactor, stir for 1-2 hours, and directly use the solvothermal method at 120-180°C for 15 hours to obtain the precursor of the solid electrolyte-coated modified positive electrode material;

[0035] (3) Filter the product in step (2), and then wash with absolute ethanol for 3 times, and then keep the filter cake in a blast drying oven at 80°C for 3 hours to obtain LiAlO 2 Precursors for coated cathode materials;

[0036] (4) Calcining the prepared solid electrolyte-coated modified cathode material precursor at 500°C for 4 hours to obtain a solid electrolyte-coated modified lithium-ion battery ca...

Embodiment 2

[0044] (1) put C 12 h 27 o 3 Al and CH 2 Disperse OLi in ethanol, then add an appropriate amount of stabilizer dropwise (stabilizer: ethanol volume ratio: 3:2000), and stir for 1 hour to obtain aluminum metalithium sol;

[0045] (2) Take 0.3 g of cathode material LiNi 0.5 co 0.2 mn 0.3 o 2 Add the above-mentioned sol, transfer it to the inner lining of the polytetrafluoroethylene reactor, stir for 1-2 hours, and directly use the solvothermal method at 120-180°C for 15 hours to obtain the precursor of the solid electrolyte-coated modified positive electrode material;

[0046] (3) Filter the product in step (2), and then wash with absolute ethanol for 3 times, and then keep the filter cake in a blast drying oven at 80°C for 4 hours to obtain LiAlO 2 Precursors for coated cathode materials;

[0047] (4) Calcining the prepared solid electrolyte-coated modified cathode material precursor at 500°C for 4 hours to obtain a solid electrolyte-coated modified lithium-ion battery ...

Embodiment 3

[0051] (1) put C 9 h 21 o 3 Al and LiNO 3 Disperse in ethanol, then add dropwise an appropriate amount of suitable stabilizer (stabilizer: ethanol volume ratio: 3:2000), stir for 1 hour to obtain aluminum metalithium sol;

[0052] (2) Take 0.3 g of cathode material LiNi 0.6 co 0.2 mn 0.3 o 2 Add the above-mentioned sol, transfer it to the inner lining of the polytetrafluoroethylene reactor, stir for 1-2 hours, and directly use the solvothermal method at 120-180°C for 15 hours to obtain the precursor of the solid electrolyte-coated modified positive electrode material;

[0053] (3) Filter the product in step (2), and then wash with absolute ethanol for 3 times, and then keep the filter cake in a blast drying oven at 80°C for 2~4h to obtain LiAlO 2 Precursors for coated cathode materials;

[0054] (4) Calcining the prepared solid electrolyte-coated modified cathode material precursor at 500°C for 4 hours to obtain a solid electrolyte-coated modified lithium-ion battery c...

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Abstract

The invention discloses a preparation method and application of a solid-state electrolyte-coated modified lithium ion battery positive electrode material, and belongs to the field of a lithium ion battery electrode material. The preparation method comprises the steps of (1) dispersing an aluminum source and a lithium source in an organic solvent under a certain condition, and dropwise adding an appropriate amount of stabilizer to obtain lithium aluminate sol; (2) adding an appropriate amount of the positive electrode material into the sol, transferring the mixture to a lining of a polytetrafluoroethylene reaction kettle, and obtaining a solid-state electrolyte-coated modified positive electrode material precursor by directly employing a solvothermal method; and (3) performing calcination on the prepared solid-state electrolyte-coated modified positive electrode material precursor to obtain an ultrathin solid-state electrolyte-coated modified lithium ion battery positive electrode material which is compact and uniform and is high in stability. The solid-state electrolyte-coated modified lithium ion battery positive electrode material has favorable cycle stability, excellent rate performance and reliable safety, and the preparation method has the characteristics of low cost, environmental friendliness and the like, is simple to operate and can be used for industrial production ona large scale.

Description

technical field [0001] The invention belongs to the technical field of energy storage and modification conversion, and mainly relates to the application and preparation method of a positive electrode material of a modified lithium-ion battery coated with a solid electrolyte. Background technique [0002] Lithium-ion battery is a new type of chemical power source developed in recent years. It is a hot spot for research and development all over the world. It has the characteristics of small size, light weight, high specific energy, no memory effect, and long cycle life. Widely used in mobile devices, electric vehicle energy and other fields. Among the various components of lithium-ion batteries, electrode materials are the core and key materials of lithium-ion batteries. The quality of electrode materials directly determines the specific energy, cycle life and load resistance of lithium-ion batteries and other key properties. Therefore, the development of lithium-ion battery...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 李喜飞刘文熊东彬李德军孙学良
Owner TIANJIN NORMAL UNIVERSITY
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