High-ionic conductance full-solid-state composite cathode piece, battery comprising same and preparation method

A composite positive electrode and ion conduction technology, which is applied in electrode manufacturing, electrode collector coating, non-aqueous electrolyte storage battery, etc., can solve the problems of inability to withstand the impact and extrusion of lithium-ion batteries, large interface impedance between positive electrode and solid electrolyte, and Inorganic solid electrolytes have poor flexibility and other problems, achieving excellent cycle performance and stability, shortening test time, and good coating effect

Inactive Publication Date: 2016-11-16
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low electrical conductivity, high impedance, and low capacity density of existing all-solid-state lithium battery cathode materials, poor flexibility of inorganic solid-state electrolytes, insufficient and dense contact, and inability to withstand the impact and impact that lithium-ion batteries can withstand. Extrusion, and the large interface impedance between the positive electrode and the solid electrolyte. To improve the ion conductance and capacity density of the positive electrode in the all-solid-state lithium battery, an in-situ solution method was used to coat the positive electrode active material Li with carbon nanotubes. 2 S, fully disperse and grind CNT@Li by high-energy ball milling 2 S composite material, obtain nano-scale particles, form high ion conductivity, high specific capacity composite nano-CNT@Li 2 S material

Method used

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  • High-ionic conductance full-solid-state composite cathode piece, battery comprising same and preparation method
  • High-ionic conductance full-solid-state composite cathode piece, battery comprising same and preparation method
  • High-ionic conductance full-solid-state composite cathode piece, battery comprising same and preparation method

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Effect test

Embodiment 1

[0043] An all-solid-state composite Li with high ionic conductivity 2 Preparation of S cathode sheet and preparation of composite solid electrolyte:

[0044] (1) A certain amount of Li with a purity of 99.99% 2 Dissolve S in the analytical alcohol, and prepare Li with a concentration of 0.5mol / L 2 S ethanol solution, fully dissolved and stirred for 1h. (2) Weigh a certain amount of carbon nanotubes (CNTs) that have been dried at 120°C in advance, and the mass ratio of CNTs: Li 2 S=20:80, slowly added to the solution in (1), stirred while adding, and finally the mixed solution was stirred slowly for 2 hours, and baked under the infrared light physiotherapy apparatus for 10 hours until completely dry to obtain CNT@Li 2 S composite active material. (3) The prepared CNT@Li 2 The S composite material is placed in a vacuum ball mill tank (glove box operation) and sealed, and then ball milled for 3 hours at 1050rpm / min with a high-energy ball mill to obtain the nanoscale composi...

Embodiment 2

[0046] An all-solid-state composite Li with high ionic conductivity 2 Preparation of S cathode sheet and preparation of composite solid electrolyte:

[0047] A certain amount of Li with a purity of 99.99% 2 Dissolve S in the analytical alcohol, and prepare Li with a concentration of 0.5mol / L 2 S ethanol solution, fully dissolved and stirred for 1h. (2) Weigh a certain amount of carbon nanotubes (CNTs) that have been dried at 110°C in advance, and the mass ratio of CNTs: Li 2 S=20:80, slowly added to the solution in (1), stirred while adding, and finally the mixed solution was stirred slowly for 2 hours, and baked under the infrared light physiotherapy apparatus for 10 hours until completely dry to obtain CNT@Li 2 S composite active material. (3) Final preparation of solid-state composite cathode sheet: according to the mass ratio of CNT@Li 2 S: CB (carbon black): PVDF=40:45:15 Weigh a certain mass of substances for use. Add the binder PVDF to the NMP solution and stir fo...

Embodiment 3

[0049] An all-solid-state composite Li with high ionic conductivity 2 Preparation of S cathode sheet and preparation of composite solid electrolyte:

[0050] Weigh a certain amount of Li with a purity of 99.99% 2 S and carbon nanotubes (CNTs) dried at 120°C, the mass ratio of CNT: Li 2 S=25:75. Place it in a vacuum ball mill jar and perform high-energy ball milling at 1000 rpm / min for 3 hours to obtain nanoscale composite materials. (2) Final preparation of solid-state composite cathode sheet: according to the mass ratio of Li 2 S@CNT: CB (carbon black): PVDF=40:45:15 Weigh a certain mass of substances for use. Add the binder PVDF to the NMP solution and stir for 1 hour, then add the conductive agent CB and stir for 1 hour, and finally add the active material CNT@Li 2 S was stirred together for 10 h and then coated. The positive current collector was made of Al foil. After the coating was completed, it was dried at 110 ° C for 10 h, and a high ion conductivity all-solid-s...

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Abstract

The invention discloses a high-ionic conductance full-solid-state composite cathode piece, a battery comprising the same and a preparation method. The preparation method of the full-solid-state composite cathode piece comprises the following steps: 1. preparation of a high-ionic conduction composite cathode active material CNT@Li2S: successfully coating the CNT with the active cathode material Li2S, and preparing a nano-scale composite cathode material CNT@Li2S by adopting a mechanical chemical method; and 2. preparation of a high-ionic conduction composite cathode piece: mixing the high-ionic conduction composite cathode active material CNT@Li2S, a conductive agent and a binder with an organic solvent, dispersing, and fully stirring, to obtain cathode slurry; by taking aluminum foil as a current collector of the cathode piece, coating the cathode slurry to obtain the high-ionic conduction composite cathode piece. Through the full-solid-state battery provided by the invention, the difficulties that a carbon nanotube is easily clustered, the cycle performance is unstable, and the active cathode materials are unevenly distributed, and the like can be effectively solved.

Description

technical field [0001] The invention belongs to the field of chemical energy storage batteries, and relates to a novel high-energy, high-safety solid-state lithium battery technology, specifically, to a high-ion-conductivity all-solid-state composite positive electrode sheet, a battery containing the positive electrode sheet, and a preparation method . Background technique [0002] With the continuous development and expanded application of power and energy storage new energy technology industries, enterprises, especially some high-tech industries such as aviation, have an increasing demand for high specific energy and high safety energy storage batteries. In today's next-generation battery technology and products of lithium-ion batteries, all-solid-state batteries have attracted widespread attention from the society. The all-solid lithium battery is a lithium secondary battery in which the current collector, positive and negative electrodes, and electrolytes are all made o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/04H01M4/36H01M4/58H01M4/62H01M10/052H01M10/056
CPCH01M4/0404H01M4/136H01M4/1397H01M4/366H01M4/5815H01M4/625H01M10/052H01M10/056Y02E60/10
Inventor 刘洋吴晓萌吴勇民汤卫平
Owner SHANGHAI INST OF SPACE POWER SOURCES
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