Manufacturing method of all-solid-state lithium ion battery

A lithium-ion battery, all-solid-state technology, applied in the direction of battery, electrode manufacturing, secondary battery, etc., can solve the problems of large interface impedance between solid electrolyte/electrode, low ionic conductivity of solid electrolyte, high battery preparation cost, etc., to improve Effects of electrochemical performance, lower internal resistance, and improved production efficiency

Inactive Publication Date: 2019-12-10
江西中汽瑞华新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although all-solid-state lithium-ion batteries have shown obvious advantages in many aspects, there are also some urgent problems that need to be solved: the ionic conductivity of the solid-state electrolyte is low, the interface impedance between the solid-state electrolyte / electrodes is large, and the interface compatibility is poor. The cost of battery preparation is relatively high, etc.

Method used

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  • Manufacturing method of all-solid-state lithium ion battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method of an all-solid-state lithium ion battery, the specific preparation process is as follows:

[0033] Step 1: Weigh LiAlO according to the mass ratio of 50:5:45 2 , Polyvinylidene fluoride, N-methylpyrrolidone, prepared into a solution;

[0034] Step 2: Coating the solution obtained in step 1 on the lithium iron phosphate pole piece, drying, and coating thickness of 5μm;

[0035] Step 3: Weigh Li according to the mass ratio of 50:10:1:4:35 7 La 3 Zr 2 O 12 , LiAlO 2 , Diethylene glycol monoalkyl ether, polyvinylidene fluoride, N-methylpyrrolidone, prepared into a solution;

[0036] Step 4: Coat the solution obtained in step 3 on the pole piece obtained in step 2, and dry it to a coating thickness of 12 μm;

[0037] Step 5: Laminate the pole piece and graphite negative electrode obtained in Step 4 at 85° C., 80 Mpa, and hot pressing for 4 minutes to make a 5Ah soft pack battery.

Embodiment 2

[0039] A preparation method of an all-solid-state lithium ion battery, the specific preparation process is as follows:

[0040] Step 1: Weigh Li according to the mass ratio of 45:5:50 6 MgLa 2 Ta 2 O 12 , Polytetrafluoroethylene, tetrahydrofuran, prepared into a solution;

[0041] Step 2: Coat the solution obtained in step 1 on the lithium nickel cobalt manganate 523 pole piece, and dry it to a thickness of 8 μm;

[0042] Step 3: Weigh Li according to the mass ratio of 45:8:1.5:5:40.5 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 , Li 6 MgLa 2 Ta 2 O 12 , Diethylene glycol monoalkyl ether, polytetrafluoroethylene, tetrahydrofuran, prepared into a solution;

[0043] Step 4: Coat the solution obtained in step 3 on the pole piece obtained in step 2, and dry it to a coating thickness of 10 μm;

[0044] Step 5: Laminate the pole piece and graphite negative electrode obtained in Step 4 at 85° C., 80 Mpa, and hot pressing for 4 minutes to make a 5Ah soft pack battery.

Embodiment 3

[0046] A preparation method of an all-solid-state lithium ion battery, the specific preparation process is as follows:

[0047] Step 1: Weigh Li according to the mass ratio of 40:8:52 6 BaLa 2 Ta 2 O 12 , Polyvinylpyrrolidone, N,N-diethylformamide, prepared into a solution;

[0048] Step 2: Coat the solution obtained in step 1 on the 622 pole piece of lithium nickel cobalt manganate, dry, and the coating thickness is 10 μm;

[0049] Step 3: Weigh Li according to the mass ratio 40:6:2:6:46 7 La 3 Sn 2 O 12 , Li 6 BaLa 2 Ta 2 O 12 , Propylene glycol monoalkyl ether, polyvinylpyrrolidone, N,N-diethylformamide, prepared into a solution;

[0050] Step 4: Coat the solution obtained in step 3 on the pole piece obtained in step 2, and dry it to a coating thickness of 15 μm;

[0051] Step 5: Laminate the pole piece and graphite negative electrode obtained in Step 4 at 85° C., 80 Mpa, and hot pressing for 4 minutes to make a 5Ah soft pack battery.

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Abstract

The invention discloses a manufacturing method of an all-solid-state lithium ion battery. The method comprises the following steps of dissolving a lithium-containing compound and a binder in a solventto prepare a solution; fully mixing the obtained solutions, coating on an anode plate, and drying to obtain the anode plate, wherein a coating thickness is 1-10 micron; dissolving a solid electrolyte, the lithium-containing compound, a film-forming agent and the binder in the solvent to form the solution; coating the obtained solution on a surface of the anode plate obtained in the step 2, and drying, wherein the coating thickness is 1-20 micron; and adopting a lamination process to carry out hot-pressing and assembling on the anode plate and a cathode plate to obtain a 5Ah soft package all-solid-state lithium ion battery, and after the assembled battery is subjected to formation treatment, carrying out multiplying power and cycle life testing. The obtained all-solid-state lithium ion battery has relatively high ionic conductivity and good cycle performance, a lithium-containing compound layer on the surface of the anode plate has relatively high ionic conductivity, an internal resistance of the battery can be effectively reduced, and electrochemical performance of the battery is improved.

Description

Technical field [0001] The invention belongs to the field of lithium ion battery preparation, and relates to an all-solid-state lithium ion battery and a manufacturing method thereof. Background technique [0002] The current transportation equipment demands for safe and clean energy storage far beyond the past. From fossil energy-based vehicles to hybrid vehicles to pure electric vehicles, humans urgently need safe and clean energy to alleviate fossil energy consumption, greenhouse gas emissions, and increasingly serious urban environmental pressures. In new energy vehicles, energy storage batteries, as a core component, determine the development process of new energy vehicles. New energy vehicle batteries need to meet the characteristics of safety, high energy density, and long cycle life, and solid-state lithium batteries are one of the few most promising solutions. Traditional lithium-ion batteries contain a large amount of flammable organic liquid electrolyte, which has th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1397H01M4/04H01M10/0562H01M10/42H01M10/0585H01M10/0525
CPCH01M4/1391H01M4/1397H01M4/0402H01M10/0562H01M10/4235H01M10/0585H01M10/0525H01M2300/0068H01M2220/20H01M2300/0071Y02E60/10Y02P70/50
Inventor 陈伟王海文范进雷
Owner 江西中汽瑞华新能源科技有限公司
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