Preparation method and application of composite cathode plate rich in Li-rich manganese base

A composite positive electrode, lithium-rich manganese-based technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor rate performance and cycle life, large irreversible capacity loss, fast voltage decay, etc., to achieve a single device , powder crystallinity and dispersion, low investment effect

Active Publication Date: 2018-10-12
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although commercial lithium-rich manganese-based cathode materials have high discharge specific capacity, there are still several problems: first, the first irreversible capacity loss is large; second, the rate performance and cycle life are poor; third, the cycle voltage Attenuation faster

Method used

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  • Preparation method and application of composite cathode plate rich in Li-rich manganese base

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Embodiment 1

[0021] A method for preparing a lithium-rich manganese-based composite positive electrode sheet, the preparation method comprising the following steps: Step 1: dissolving 2 parts by mass of glucose in deionized water;

[0022] Step 2: Add 100 parts by mass of lithium-rich manganese base and dissolved glucose solution into the hydrothermal reaction kettle, heating at 120°C for 4 hours;

[0023] Step 3: Take out the cooled mixed solution and filter with suction, and dry the filtered powder at 70°C for 4 hours;

[0024] Step 4: Take 80 parts by mass of lithium-rich manganese-based powder coated with an organic carbon source, 2 parts by mass of Surpe-P, 2 parts by mass of polyvinylidene fluoride, and 2 parts by mass of lithium lanthanum zirconium oxide (LLZO) and 3 parts by mass of LiTFSI are uniformly mixed and dispersed in N-methylpyrrolidone solvent, and fully stirred with a vacuum planetary mixer to obtain a composite positive electrode slurry;

[0025] Step 5: Use a coating ...

Embodiment 2

[0028] A method for preparing a lithium-rich manganese-based composite positive electrode sheet, the preparation method comprising the following steps: Step 1: dissolving 4 parts by mass of sucrose in deionized water;

[0029] Step 2: Add 100 parts by mass of lithium-rich manganese base and dissolved sucrose solution into a hydrothermal reaction kettle, heat at 150°C for 4 hours;

[0030] Step 3: Take out the cooled mixed solution and filter with suction, and dry the filtered powder at 80°C for 8 hours;

[0031] Step 4: Take 85 parts by mass of lithium-rich manganese-based powder coated with an organic carbon source, 2 parts by mass of acetylene black, 3 parts by mass of polyvinylidene fluoride-hexafluoropropylene, and 3 parts by mass of lithium lanthanum titanium oxide (LLTO) and 3 parts by mass of LiClO mixed uniformly and dispersed in N-methylpyrrolidone solvent, fully stirred with a vacuum planetary mixer to obtain composite positive electrode slurry;

[0032] Step 5: Use...

Embodiment 3

[0035] A method for preparing a lithium-rich manganese-based composite positive electrode sheet, the preparation method comprising the following steps: Step 1: dissolving 5 parts by mass of citric acid in deionized water;

[0036] Step 2: Add 100 parts by mass of lithium-rich manganese base and dissolved citric acid solution into the hydrothermal reaction kettle, heating at 180°C for 6 hours;

[0037] Step 3: Take out the cooled mixed solution and filter with suction, and dry the filtered powder at 80°C for 8 hours;

[0038] Step 4: Take 90 parts by mass of lithium-rich manganese-based powder coated with an organic carbon source, 3 parts by mass of graphene, 4 parts by mass of polytetrafluoroethylene, and 6 parts by mass of lithium lanthanum zirconium tantalum oxide (LZTO) and 6 parts by mass of LiPF6 mixed uniformly and then dispersed in N-methylpyrrolidone solvent, fully stirred uniformly with a vacuum planetary mixer to obtain a composite positive electrode slurry;

[0039...

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Abstract

The invention discloses a preparation method of a composite cathode plate rich in Li-rich manganese base, which is characterized by comprising the steps that an organic carbon source is dissolved in deionized water; adding the Li-rich manganese base and the dissolved carbon source solution into a hydrothermal reaction kettle, and drying powder obtained by suction filtering; uniformly mixing Li-rich manganese base powder coated with the organic carbon source, a conductive agent, a binder, a fast ionic conductor and lithium salt to obtain a mixture and dispersing the mixture in an N-methyl pyrrolidone solvent, and fully and uniformly stirring the solution with a vacuum planetary stirrer to obtain composite cathode slurry; coating a conductive coating aluminum foil with the composite cathodeslurry by a coating machine, then drying in a vacuum baking oven, and finally perform slitting to obtain the composite cathode plate. The hydrothermal method has the advantages of good crystallinity and dispersibility, low energy consumption, low pollution, low investment, high yield, single equipment, simple process flow and the possibility of large-scale production.

Description

technical field [0001] The invention relates to the field of new energy lithium batteries, relates to a preparation method of a composite positive electrode sheet rich in lithium-rich manganese base, and also relates to an application of a composite positive electrode sheet rich in lithium-rich manganese base. Background technique [0002] Traditional lithium-ion batteries use organic liquid electrolytes. Under abnormal conditions such as overcharging and internal short circuits, the batteries tend to heat up, causing the electrolyte to swell, spontaneously ignite or even explode, posing serious safety hazards. The all-solid-state lithium battery based on solid electrolyte developed in the 1950s, due to the use of solid electrolyte, does not contain flammable and volatile components, and completely eliminates safety hazards such as battery smoke and fire caused by battery leakage. For the safest battery system. [0003] The main problem faced by all-solid-state lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/36H01M4/505H01M4/583H01M4/62H01M10/0525
CPCH01M4/1391H01M4/1393H01M4/366H01M4/505H01M4/583H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 李峥冯玉川何泓材李培养杨帆南策文
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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