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Preparation method of lithium-rich manganese positive electrode material with controllable lithium content

A positive electrode material, lithium-rich manganese technology, applied in the field of lithium-ion battery preparation, can solve problems such as unfavorable large-scale production, a large number of complexing agents, lithium salt volatilization, etc., to facilitate large-scale production, suppress oxygen defects, reduce oxygen The effect of defects

Active Publication Date: 2020-01-14
SUZHOU PHYLION BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solid-state reaction method is simple and easy to produce in batches, but there are problems such as uneven mixing, poor solid-solid contact, lithium salt volatilization at high temperature, and poor repeatability.
The product prepared by the co-precipitation method has good uniformity, but requires a large amount of complexing agent, and the chemical composition is difficult to control precisely
The sol-gel method often uses expensive organic solvents, which are expensive and difficult to mass produce
The spray drying method has complex equipment, large floor space, high energy consumption, and is not conducive to large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] To prepare precursor A, weigh 16.0g manganese dioxide, 2.0g Super P and 2.0g PVDF into a 50ml beaker, add 20ml NMP and stir evenly, coat the obtained slurry on an aluminum foil, dry at 80°C for 6 hours, and 120°C Vacuum-dried for 12 hours, the small-sized roll-to-roll machine was rolled twice, and a positive electrode sheet with a diameter of 15mm was obtained using a puncher. The mass of the electrode sheet was weighed as 0.071g. The mass of manganese dioxide can be obtained as 0.0512g. Transfer the pole piece to the glove box, select the CR2032 button battery case, and assemble the battery according to the sequence of negative electrode case, spring sheet, gasket, lithium sheet, diaphragm, positive electrode sheet, and positive electrode case , add 5 drops of conductive solution (1M LiPF 6 , EMC: EC=7:3), and sealed with a sealing machine to prepare button cells. Put the prepared button battery on the battery tester, and discharge it at a constant current of 0.05C to...

Embodiment 2

[0035] Prepare precursor A and precursor B according to the scheme of Example 1, take 0.07g of precursor A and 0.03g of precursor B, grind and mix them evenly in a mortar, put them into an alumina ark, compact them with a medicine spoon, and put the alumina ark Put it in a muffle furnace and keep it warm at 900° C. for 12 hours to obtain a lithium-rich manganese positive electrode material.

[0036] The prepared lithium-rich manganese cathode material was made into a button battery, and the reversible capacity reached 268.2mAh / g at 0.2C rate, and still had 198.5 mAh / g after 50 cycles at 1C rate.

Embodiment 3

[0038] Prepare precursor A and precursor B according to the scheme of Example 1, take 0.03g of precursor A and 0.07g of precursor B, grind and mix them evenly in a mortar, put them into an alumina ark, compact them with a medicine spoon, and put the alumina ark Put it in a muffle furnace, heat it at 700° C. for 8 hours to obtain a lithium-rich manganese positive electrode material.

[0039] The prepared lithium-rich manganese cathode material was made into a button battery, and the reversible capacity reached 251.2mAh / g at 0.2C rate, and still had 211.0 mAh / g after 50 cycles at 1C rate.

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Abstract

The invention discloses a preparation method of a lithium-rich manganese positive electrode material with a controllable lithium content. The method is characterized in that manganese dioxide, a conductive agent and a binder are mixed uniformly in N-methylpyrrolidone, coating is performed on an aluminum foil and oven-drying is performed, the coated aluminum foil is connected with a positive electrode of a discharge instrument as a positive electrode sheet, a negative electrode of the discharge instrument is connected with metal lithium, the positive electrode sheet and metal lithium are placedin the same container, an organic solvent that dissolves a lithium salt is added, and two precursors with a controllable lithium-manganese ratio are prepared by controlling the discharge capacity; and mixed sintering is performed to obtain the lithium-rich manganese positive electrode material, and the lithium-rich manganese positive electrode materials with different lithium contents can be obtained through controlling a mass ratio of the two precursors. The method can realize accurate control of a lithium-manganese ratio, is convenient for realizing large-scale production, can adjust a lithium content at any time according to customer needs, and has wide applicability.

Description

technical field [0001] The invention relates to the preparation of a lithium ion battery, in particular to a preparation method of a lithium-rich manganese cathode material with controllable lithium content. Background technique [0002] As an important electrochemical energy storage device, lithium-ion batteries have great application and development prospects in the fields of consumer electronics, energy storage batteries, and power batteries. However, the current energy density of lithium-ion batteries is only 1 / 50 to 1 / 3 of that of gasoline. 100, which is a short board that limits the widespread application of lithium-ion batteries. Especially for the positive electrode material in the battery, the gram capacity of conventional lithium cobaltate, lithium iron phosphate, lithium manganate and ternary materials is usually lower than 200mAh / g, or even lower than 150mAh / g. Therefore, the gram capacity of the positive electrode material should be increased , is the focus of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/1391H01M4/505H01M10/0525
CPCC01G45/125C01G45/1228H01M4/505H01M10/0525H01M4/1391H01M2004/028Y02E60/10
Inventor 赵成龙王正伟朱华君王永琛张秀奎吴叶超
Owner SUZHOU PHYLION BATTERY
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