Novel chip type solid secondary lithium battery supported by garnet type solid electrolyte and preparation method thereof

A secondary lithium battery, solid electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of new hybrid all-solid-state battery reports, etc. Good, the effect of improving energy density

Inactive Publication Date: 2016-11-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Novel chip type solid secondary lithium battery supported by garnet type solid electrolyte and preparation method thereof
  • Novel chip type solid secondary lithium battery supported by garnet type solid electrolyte and preparation method thereof
  • Novel chip type solid secondary lithium battery supported by garnet type solid electrolyte and preparation method thereof

Examples

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preparation example Construction

[0043] Preferably, the preparation method of the all-solid-state lithium battery is characterized by comprising the following steps:

[0044] 1) According to the chemical formula Li 7-x La 3 Zr 2-x T x o 12 (x=0-1, T=Al, Ta, Nb, W, Ga, Y, Te, etc.) in the molar ratio of Li, La, Zr, T, choose LiOH, La(OH) 3 , ZrO 2 and the corresponding oxide T x o y As a raw material, the excess of LiOH is 5-20%, which is ball-milled in an alcohol medium for 10-30 hours, dried, and then calcined at 850-1000°C for 6-10 hours to obtain Li 7-x La 3 Zr 2-x T x o 12 ceramic powder. Transfer the ceramic powder into a carbon mold, and sinter it under Ar atmosphere by hot pressing at 1000-1200°C and 15MPa for 1-2 hours. Then processed into ceramic sheets of required thickness and size;

[0045] 2) In a dry atmosphere, add an appropriate amount of lithium ion conductor and organic solvent into the mortar to fully disperse or dissolve the lithium ion conductor material, and then add the po...

Embodiment 1

[0058] A new type of hybrid all-solid-state secondary lithium battery based on garnet-type solid electrolyte, the structure of the device is shown in the appendix figure 1 , the negative electrode 1, solid electrolyte layer 2, and polymer composite positive electrodes 3 and 4 used are as follows:

[0059] Solid electrolyte layer: use highly dense Li 7-x La 3 Zr 2-x Ta x o 12(LLZTO) ceramic sheet (density greater than 96%), which can not only transmit lithium ions but also protect the electrolyte layer of metal lithium, with a thickness of 0.1μm-10mm;

[0060] Polymer composite positive electrode: In an inert atmosphere glove box, add an appropriate amount of lithium salt and NMP into an agate mortar to fully dissolve the lithium salt, and then add LiFePO 4 , Add conductive carbon into the mortar, and finally take the pre-prepared PVdF solution (solvent is NMP) and transfer it to the mortar and grind it with a pestle to obtain a uniformly distributed composite positive ele...

Embodiment 2

[0063] A novel hybrid all-solid-state secondary lithium battery based on a garnet-type solid electrolyte, the structure of the device is the same as in Example 1. The preparation method of the solid electrolyte layer is the same as in Example 1, and the relative density of the LLZTO ceramic sheet reaches 99%, and its XRD is as follows: figure 2 As shown in a, it can be seen that the main phase of the ceramic is a cubic garnet structure. Using a circular Li electrode as the test electrode, the electrical properties of the ceramic sample were tested at room temperature, and its AC impedance spectrum was obtained as shown in 2b. The calculated room temperature ionic conductivity was 6.6×10 -4 S cm - 1 .

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Abstract

The invention relates to a novel chip type solid secondary lithium battery supported by a garnet type solid electrolyte and a preparation method thereof. In the solid secondary lithium battery, one side of the solid electrolyte is coated with a positive pole which is prepared from a positive pole active material, a polymer, a lithium ion conductor and conductive carbon, wherein the positive pole active material comprises LiFePO4, LiCoO2, LiMn2O4, LiNi0.5Mn1.5O4, LiNixCoyMn1-x-yO2 and/or Li[LixM1-x]O2, M is at least one of Ni, Co and Mn, the polymer comprises at least one of PEO, PVdF, PMMA and PAN, the lithium ion conductor comprises lithium salt, the mass ratio of the positive pole active material, to the conductive carbon to the polymer to the lithium ion conductor is 10:2:1:z, and z is smaller than or equal to 10.

Description

technical field [0001] The invention relates to a chip-type solid-state secondary lithium battery supported by a garnet-type solid electrolyte, which belongs to the technical field of batteries. Background technique [0002] In recent years, with the development of electric vehicles and the demand for grid energy storage and small energy storage, it is necessary to develop batteries that can be used in a wide temperature range, have high safety, high energy density, power density, and long life. Existing lithium-ion batteries use organic liquid electrolytes, which have problems such as flammability and low electrochemical windows, and cannot meet the dual requirements of high specific energy and high safety for future batteries. All-solid-state lithium batteries use pure solid-state inorganic solid electrolytes or polymer electrolytes instead of organic liquid electrolytes, which have better safety and thermal stability, and at the same time have a higher electrochemical win...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525H01M10/058H01M4/62H01M4/134
CPCY02E60/10Y02P70/50
Inventor 郭向欣杜付明赵宁李忆秋陈骋
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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