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Preparing method and application of high-purity lithium manganate anode material

A technology of pure lithium manganate and cathode material, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of large-scale production difficulty and high energy consumption, and achieve good cycle stability, high purity, and cheap raw materials Effect

Inactive Publication Date: 2016-04-20
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the hydrothermal reaction is carried out under high temperature and high pressure, it is possible to obtain products with nanoparticle size and good crystallization. However, due to the high temperature and high pressure required by the equipment, high energy consumption, large-scale production is difficult.

Method used

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  • Preparing method and application of high-purity lithium manganate anode material
  • Preparing method and application of high-purity lithium manganate anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 1.6g of manganese dioxide, 0.2g of PVDF and 0.2g of acetylene black, grind them in a mortar for half an hour and mix them well, take 0.2g of the mixture and put it into a mold, press it under a pressure of 20MPa for 1 minute to form a tablet. Use the pressed sheet as the positive electrode, select the CR2032 button battery case, assemble the battery in the order of the negative electrode case, spring sheet, gasket, lithium sheet, diaphragm, positive electrode, and positive electrode case, add 5 drops of lithium-ion battery electrolyte, and seal it with a sealing machine Prepare button cells. Put the prepared button battery on a battery tester, and discharge it at a constant current of 0.05C to a capacity of 24.66mAh. The manganese dioxide after lithium intercalation was taken out, and kept in a muffle furnace at 750° C. for 12 hours to obtain lithium manganate.

[0032] Mix the obtained lithium manganate with the conductive agent acetylene black and the binder PV...

Embodiment 2

[0035] Weigh 12g of manganese dioxide, 4g of PVDF, and 4g of acetylene black, put them into a 100ml ball mill jar with a ball-to-material ratio of 3:1, grind for 2 hours and mix well, take 0.2g of the mixture and put it into a mold, press it under 25MPa for 1 minute to form a tablet . Use the pressed sheet as the positive electrode, select the CR2032 button battery case, assemble the battery in the order of the negative electrode case, spring sheet, gasket, lithium sheet, diaphragm, positive electrode, and positive electrode case, add 5 drops of lithium-ion battery electrolyte, and seal it with a sealing machine Prepare button cells. Put the prepared button battery on the battery tester, and discharge it at a constant current of 0.05C to a capacity of 18.49mAh. The manganese dioxide after lithium intercalation was taken out, and kept in a muffle furnace at 800° C. for 8 hours to obtain lithium manganate.

[0036] Mix the obtained lithium manganate with the conductive agent a...

Embodiment 3

[0039] Weigh 1.8g of manganese dioxide, 0.1g of PVDF and 0.1g of carbon nanotubes, grind them in a mortar for half an hour and mix them well, take 0.2g of the mixture and put it into a mold, and press it under a pressure of 30MPa for 1 minute to form a tablet. Use the pressed sheet as the positive electrode, select the CR2032 button battery case, assemble the battery in the order of the negative electrode case, spring sheet, gasket, lithium sheet, diaphragm, positive electrode, and positive electrode case, add 5 drops of lithium-ion battery electrolyte, and seal it with a sealing machine Prepare button cells. Put the prepared button battery on the battery tester, and discharge it at a constant current of 0.05C to a capacity of 27.74mAh. The manganese dioxide after lithium intercalation was taken out, and kept in a muffle furnace at 700° C. for 16 hours to obtain lithium manganate.

[0040]Mix the obtained lithium manganate with the conductive agent acetylene black and the bin...

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Abstract

The invention belongs to the field of lithium ion batteries, and particularly relates to a preparing method and application of a high-purity lithium manganate anode material. A lithium ion battery prepared from the high-purity lithium manganate anode material is also disclosed. Manganese dioxide is embedded into lithium ions by means of the electrochemical method, and then annealing is conducted to generate the high-purity lithium manganate material. The proportion of lithium to manganese can be accurately controlled by controlling discharge electric quantity, so that the high-purity lithium manganate material is obtained. The lithium manganate material prepared with the method has extremely high cycle performance as the anode of the lithium ion battery.

Description

(1) Technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method and application of a high-purity lithium manganate cathode material. (2) Background technology [0002] Spinel-type lithium manganese oxide belongs to the cubic crystal system, Fd3m space group, and the theoretical specific capacity is 148mAh / g. Due to the three-dimensional tunnel structure, lithium ions can be reversibly deintercalated from the spinel lattice without causing structural changes. collapse, thus exhibiting excellent rate capability and stability. [0003] At present, the common preparation methods of lithium manganate mainly include solid-state reaction method, sol-gel method and hydrothermal reaction method. The traditional solid-phase reaction method is simple and can realize batch production. However, there are problems such as uneven mixing, large particles, unstable batches, poor repeatability, and low product purity ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 李丽赵成龙陈建伟王瑛王龙王超武于文倩张庆朋
Owner SHANDONG YUHUANG NEW ENERGY TECH
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