Novel composite cathode and manufacturing method of all-solid-state lithium battery

A technology of all-solid-state batteries and composite positive electrodes, which is applied in the direction of positive electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as large interface impedance, incompatibility of battery assembly and manufacturing processes, and increased battery manufacturing costs.

Pending Publication Date: 2020-10-16
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The all-solid-state battery prepared by the above method has problems such as difficult sintering of the electrolyte ceramic, thicker electrolyte ceramic, and large interface impedance between the electrolyte and the positive and negative electrodes, which ultimately leads to poor performance and low energy consumption of the prepared all-solid-state battery. lower density
At the same time, using electrolyte ceramics to prepare all-solid-state batteries, the battery assembly process is not compatible with the existing lithium-ion battery manufacturing process, and the preparation process and conditions for all-solid-state batteries need to be redesigned, increasing battery manufacturing costs

Method used

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  • Novel composite cathode and manufacturing method of all-solid-state lithium battery
  • Novel composite cathode and manufacturing method of all-solid-state lithium battery
  • Novel composite cathode and manufacturing method of all-solid-state lithium battery

Examples

Experimental program
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Embodiment 1

[0065] Lithium hydroxide, lanthanum oxide, zirconia, and niobium oxide were weighed according to the stoichiometric ratio, wherein 6.6 parts of lithium hydroxide, 1.5 parts of lanthanum oxide, 1.6 parts of zirconia, and 0.2 parts of niobium oxide were used to prepare Li 6.6 La 3 Zr 1.6 Nb 0.4 o 12 Powder. Add the above raw materials into a nylon ball mill jar, add isopropanol with a mass ratio of 1.5:1, and yttrium-stabilized zirconia ball milling media with a mass ratio of 5:1, wherein the diameters of yttrium-stabilized zirconia are 3mm and 6mm, and its mass The ratio is 1:1.4. The mixed raw materials were placed in a planetary ball mill for ball milling, the ball milling speed was 800r / min, and the ball milling time was 6h. The obtained mixed raw material slurry was placed in a blast drying oven, and dried at 70° C. for 20 h to obtain mixed raw material powder. Put the mixed raw material powder in a corundum crucible, vibrate the powder and place it in a muffle furnac...

Embodiment 2

[0068] Lithium hydroxide, lanthanum oxide, zirconia, and niobium oxide were weighed according to the stoichiometric ratio, wherein lithium hydroxide was 6.8 parts, lanthanum oxide was 1.5 parts, zirconia was 1.8 parts, and niobium oxide was 0.1 part, to prepare Li 6.8 La 3 Zr 1.8 Nb 0.2 o 12 Powder. Add the above raw materials into a nylon ball mill jar, add isopropanol with a mass ratio of 1.5:1, and yttrium-stabilized zirconia ball milling media with a mass ratio of 5:1, wherein the diameters of yttrium-stabilized zirconia are 3mm and 6mm, and its mass The ratio is 1:1.4. The mixed raw materials were placed in a planetary ball mill for ball milling, the ball milling speed was 800r / min, and the ball milling time was 6h. The obtained mixed raw material slurry was placed in a blast drying oven, and dried at 70° C. for 20 h to obtain mixed raw material powder. Put the mixed raw material powder in a corundum crucible, place the powder in a muffle furnace after vibration, ra...

Embodiment 3

[0071] Lithium hydroxide, lanthanum oxide, zirconia, and niobium oxide were weighed according to the stoichiometric ratio, wherein 6.28 parts of lithium hydroxide, 1.5 parts of lanthanum oxide, 2 parts of zirconia, and 0.08 parts of aluminum hydroxide were used to prepare Li 6.28 La 3 Zr 2 Al 0.24 o 12 Powder. Add the above raw materials into a nylon ball mill jar, add isopropanol with a mass ratio of 1.5:1, and yttrium-stabilized zirconia ball milling media with a mass ratio of 5:1, wherein the diameters of yttrium-stabilized zirconia are 3mm and 6mm, and its mass The ratio is 1:1.4. The mixed raw materials were placed in a planetary ball mill for ball milling, the ball milling speed was 800r / min, and the ball milling time was 4h. The obtained mixed raw material slurry was placed in a blast drying oven, and dried at 70° C. for 20 h to obtain mixed raw material powder. Put the mixed raw material powder in a corundum crucible, place the powder in a muffle furnace after v...

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Abstract

The invention discloses a novel composite cathode and a preparation method thereof, is applied to manufacturing of an all-solid-state battery, and belongs to the field of manufacturing of all-solid-state lithium batteries. The novel composite cathode is composed of a current collector, a cathode layer and an electrolyte layer, the compatibility of the manufacturing process of the novel composite cathode and the manufacturing process of an existing lithium ion battery cathode pole piece is good, tight combination between the cathode material layer and the electrolyte material layer is promoted,and the interface impedance of the all-solid-state battery is reduced. The prepared composite cathode and the manufacturing process thereof can be applied to the manufacturing process of various types of all-solid-state batteries, and the method is simple and convenient.

Description

technical field [0001] The invention relates to the field of design and manufacture of lithium-ion batteries, in particular to a design and manufacture method of a high-capacity all-solid-state lithium battery. Background technique [0002] In today's society, lithium-ion batteries are more and more widely used in daily life. Traditional lithium-ion batteries using organic electrolytes as electrolytes encounter bottlenecks in terms of energy density and safety. While chasing high energy density, it also poses challenges to the safety of batteries. In order to solve the above problems in energy density and safety of lithium-ion batteries using organic electrolytes, non-flammable inorganic solid electrolytes are used to replace organic electrolytes and organic separators to block the contact between the positive and negative electrodes of lithium-ion batteries, and at the same time conduct lithium. transport of ions. [0003] For the assembly of all-solid-state batteries, e...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M4/04H01M4/13H01M10/0525
CPCH01M10/0562H01M4/0407H01M4/0419H01M4/13H01M10/0525H01M2004/028H01M2300/0077H01M2300/0091Y02E60/10
Inventor 陈召勇吉闫朱华丽谢子璇
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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