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A method for preparing manganese-based lithium-ion battery cathode materials based on alkali metal-liquid ammonia method

A technology for lithium-ion batteries and cathode materials, applied in the new preparation of manganese-based materials, based on the alkali metal-liquid ammonia method to prepare manganese-based lithium-ion battery cathode materials, the field of cathode materials for lithium-ion batteries, can solve the problem that the cost is difficult to increase Large-scale production, irregular shape of crystal grains, complex precursor control and other issues, to achieve the effect of improving structural stability, low production cost, and capacity retention

Active Publication Date: 2017-04-19
XI AN JIAOTONG UNIV
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Problems solved by technology

However, due to insufficient contact between lithium salt and manganese salt during calcination, there are disadvantages such as uneven phase, irregular grain shape, and large grain boundary size.
Although the specific capacity and cycle performance of lithium manganate prepared by sol-gel methods have been significantly improved, the preparation method is often cumbersome, and the control of the precursor is also complicated. mass production

Method used

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  • A method for preparing manganese-based lithium-ion battery cathode materials based on alkali metal-liquid ammonia method
  • A method for preparing manganese-based lithium-ion battery cathode materials based on alkali metal-liquid ammonia method
  • A method for preparing manganese-based lithium-ion battery cathode materials based on alkali metal-liquid ammonia method

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Effect test

Embodiment 1

[0020] Embodiment 1: Spinel type lithium manganese oxide material

[0021] A method for preparing manganese-based lithium ion battery cathode materials based on an alkali metal-liquid ammonia method comprises the following steps: obtaining a certain volume of pure liquid ammonia solution by cooling ammonia gas under a protective atmosphere. Manganese dioxide and metal lithium were added to the liquid ammonia solution in sequence, and the stirring speed was kept at 800r / min. The molar ratio of manganese dioxide to metallic lithium is 1:2, which ensures that the obtained lithium manganate has a relatively pure spinel structure, dispersibility and uniformity. Stir evenly at low temperature for 1 hour, and keep the reaction temperature at -60°C. After the reaction is complete, slowly increase the temperature, and wait for the liquid ammonia to evaporate naturally. Collect the residual solids in the container and put them into the reaction furnace, anneal at 800°C for 4 hours, coo...

Embodiment 2

[0022] Embodiment 2: layered lithium manganate material

[0023] Obtain a certain volume of pure liquid ammonia solution by cooling ammonia gas under a protective atmosphere.

[0024] Manganese dioxide and metal lithium were added to the liquid ammonia solution in sequence, and the stirring speed was kept at 800r / min. Wherein the molar ratio of manganese dioxide to metallic lithium is 1:1, changing the ratio can control the crystal structure of lithium manganate, and obtain layered LiMnO 2 Cathode material. Stir evenly at low temperature for 3 hours, keep the reaction temperature at -60°C, raise the temperature slowly after the reaction is complete, and wait for the liquid ammonia to evaporate naturally. Collect the residual solids in the container and put them into the reaction furnace, anneal at 600°C for 8 hours, and cool naturally. After powder treatment, layered LiMnO is finally obtained. 2 Cathode material. The protective gas used in the above steps is argon. The re...

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Abstract

The invention relates to a method for preparing a manganese-based lithium ion battery positive electrode material based on an alkali metal-liquid ammonia process. The method comprises the following steps that (1) alkali metal produces a low-temperature reaction with manganese oxide in liquid ammonia to obtain primary lithium manganate; and (2) primary lithium manganate is subjected to high-temperature annealing treatment to obtain a lithium manganate positive electrode material with a special coating structure.

Description

technical field [0001] The invention belongs to the technical field of batteries, relates to a new preparation method of manganese-based materials, and is mainly applied to positive electrode materials of lithium-ion batteries. In particular, it relates to a method for preparing manganese-based lithium-ion battery cathode materials based on an alkali metal-liquid ammonia method. Background technique [0002] At present, secondary batteries using lithium cobalt oxide as the positive electrode material have been commercialized, but due to the shortage of cobalt resources, high price and toxicity, its promotion and use are restricted. Lithium manganate cathode material has good thermal stability, overcharge resistance, superior high-current charge and discharge performance, abundant resources and little adverse impact on the environment, so it is considered as the cathode material for a new generation of lithium-ion secondary batteries. However, low specific capacity, poor cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505C01G45/12
CPCC01G45/1228C01G45/1242C01P2002/72C01P2006/40H01M4/505H01M10/0525Y02E60/10
Inventor 张垠许敏炜周超杨森
Owner XI AN JIAOTONG UNIV
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