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Solid-state battery and preparation method and application thereof

A solid-state battery and solid-state technology, applied in battery electrodes, lithium batteries, secondary batteries, etc., can solve problems such as poor cycle performance and poor electrochemical performance, and achieve high conductivity, charge and discharge capacity, high first effect, and high capacity Good retention rate and cycle stability

Inactive Publication Date: 2020-07-17
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to propose a solid-state battery and its preparation method and application to solve the problems of poor electrochemical performance in sulfide solid-state batteries, especially poor cycle performance, and significantly improve the performance of sulfide solid-state batteries. Conductivity, cycle performance, rate performance, safety performance and service life, etc., make sulfide solid-state batteries have better rate performance and cycle performance at room temperature and high temperature

Method used

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  • Solid-state battery and preparation method and application thereof
  • Solid-state battery and preparation method and application thereof

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Embodiment 1

[0108] (1) Synthesis of Ni by hydroxide coprecipitation method 0.83 co 0.08 mn 0.09 (OH) 2 For the precursor, lithium hydroxide was mixed with the precursor at a molar ratio of 1.05:1, and then the mixture was calcined at 750° C. for 10 hours, and the obtained positive electrode material was named NCM-811. After the calcined powder material is ground by a mortar or an ultra-centrifugal grinder until the particle size is less than 3 μm, the sample is tested for residual alkali content, and the test result shows that the residual lithium salt content is 0.07 mol%, which is used as Subsequent in situ generation of directing agent for LATP coating layer;

[0109] (2) Weigh 100g of the positive electrode material obtained in step (1), and weigh Li 2 CO 3 (0.18g) as the second lithium salt, Al 2 o 3 (0.02g), TiO 2 (0.35g) and (NH 4 ) 3 PO 4 (1.15g), where Li 2 CO 3 、Al 2 o 3 、TiO 2 and (NH 4 ) 3 PO 4 Has been ground to nanoparticles (2 CO 3 、Al 2 o 3 、TiO 2 an...

Embodiment 2

[0115] (1) Synthesis of Ni by hydroxide coprecipitation method 0.83 co 0.08 mn 0.09 (OH) 2 For the precursor, lithium hydroxide was mixed with the precursor at a molar ratio of 1.05:1, and then the mixture was calcined at 750° C. for 10 hours, and the obtained positive electrode material was named NCM-811. After the calcined powder material is ground by a mortar or an ultra-centrifugal grinder until the particle size is less than 3 μm, the sample is tested for residual alkali content, and the test result shows that the residual lithium salt content is 0.07 mol%, which is used as Subsequent in situ generation of directing agent for LATP coating layer;

[0116] (2) Weigh 100g of the positive electrode material obtained in step (1), and weigh Li 2 CO 3 (0.18g) as the second lithium salt, Al 2 o 3 (0.02g), TiO 2 (0.35g) and (NH 4 ) 3 PO 4 (1.15g), where Li 2 CO 3 、Al 2 o 3 、TiO 2 and (NH 4 ) 3 PO 4 Has been ground to nanoparticles (2 CO 3 、Al 2 o 3 、TiO 2 an...

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Abstract

The invention discloses a solid-state battery and a preparation method and application thereof. The solid-state battery comprises a positive plate, a solid-state sulfide electrolyte layer and a negative plate. The positive plate comprises a positive composite material, a solid-state sulfide electrolyte and a conductive agent, the positive composite material comprises a positive material and an LATP coating layer formed on the surface of the positive material, and the solid sulfide electrolyte layer is arranged between the positive plate and the negative plate, wherein the LATP coating layer isobtained by taking the residual lithium salt on the surface of the positive electrode material as a guiding agent and the lithium source and inducing the lithium source, an aluminum source, a titanium source and a phosphorus source through an in-situ synthesis method. The solid-state battery has better rate capability and cycle performance at room temperature and a high temperature (70 DEG C).

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a solid-state battery and a preparation method and application thereof. Background technique [0002] Solid-state lithium batteries are widely considered to be a promising development direction for the next generation of various energy storage devices due to their high energy density and excellent safety performance. However, the interface problem between the electrode sheet and the solid-state electrolyte is still the key to hinder the industrial development and commercial application of solid-state lithium batteries. For typical solid-state lithium batteries, the most common and vexing problem is how to achieve and maintain tight solid-solid interfacial contact. Meanwhile, different types of solid-state electrolytes can present different problems, depending on the inherent properties of adjacent solid-state components. [0003] A solid sulfide electrolyte is a sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052H01M10/0562H01M10/42H01M4/505H01M4/525
CPCH01M4/366H01M4/5825H01M4/624H01M10/0562H01M10/4235H01M10/052H01M4/505H01M4/525Y02E60/10H01M2300/0068H01M10/0525H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/62Y02P70/50
Inventor 拉杰什·麦加李红朝周龙捷朱金鑫普拉杰什·PP马忠龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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