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A preparing method of a LiMn<1.5>Ni<0.5>O<4-a> cathode material

A cathode material and a technology for preparation steps, applied in the field of cathode materials for lithium ion batteries, can solve the problems of batch consistency of materials, unfavorable industrialization technology promotion, increase the types of raw materials, etc., so as to avoid system consistency imbalance and electrochemical performance. Excellent, improved cycle life effect

Inactive Publication Date: 2015-06-10
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The found patent application adopts the method of metal element doping, which reduces the volume shrinkage or expansion and improves the power performance of the spinel cathode material. However, due to the introduction of new metal elements during the doping process, the types of raw materials are increased. , so that there is a problem with the batch consistency of the material, which is not conducive to the promotion of industrial technology of the product

Method used

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preparation example Construction

[0017] LiMn 1.5 Ni 0.5 o 4-a The preparation method of the positive electrode material, the preparation steps include: making the precursor: (1) according to the ratio of molar ratio Li:Ni:Mn=1.1-2:0.5-1:1.5-2, lithium carbonate, nickelous oxide, manganese dioxide, Use ethanol as the ball milling medium to carry out wet ball milling and mixing for 3-15 hours to form LiMn 1.5 Ni 0.5 o 4 Slurry precursor; (2) LiMn 1.5 Ni 0.5 o 4 After the slurry precursor is taken out, put it in a drying oven at 60°C-80°C for 3-6 hours to dry, and the LiMn 1.5 Ni 0.5 o 4 The production process of the precursor is characterized in that the preparation step also includes sintering LiMn in different temperature sections. 1.5 Ni 0.5 o 4 Precursor, complete LiMn 1.5 Ni 0.5 o 4-a (0<a≤0.05) The manufacturing process of the cathode material.

[0018] The sintered LiMn is divided into different temperature sections 1.5 Ni 0.5 o 4 The precursor process includes: LiMn that will be made ...

Embodiment 1

[0020] Lithium carbonate (Li 2 CO 3 ), nickelous oxide (NiO), manganese dioxide (MnO 2 ) According to the ratio of molar ratio Li:Ni:Mn=1.5:0.5:1.5, put lithium carbonate, nickelous oxide, and manganese dioxide into a ball mill, and use ethanol as the ball milling medium for wet ball milling and mixing for 4 hours to form LiMn 1.5 Ni 0.5 o 4 Slurry precursor; LiMn 1.5 Ni 0.5 o 4 After the slurry precursor was taken out, it was dried in a 60°C drying oven for 3 hours to complete the LiMn 1.5 Ni 0.5 o 4 The production process of the precursor; the prepared LiMn 1.5 Ni 0.5 o 4 The precursor is placed in a high-temperature muffle furnace, first sintered at 850°C for 14 hours, then the temperature in the high-temperature muffle furnace is lowered from 850°C to 610°C within 2 hours, and sintered at 610°C for 6 hours. Cool naturally to 25°C room temperature and take it out to form the LiMn of the present invention. 1.5 Ni 0.5 o 4-a Cathode material.

Embodiment 2

[0022] Put lithium carbonate, nickelous oxide, and manganese dioxide into a ball mill according to the molar ratio Li:Ni:Mn=1.2:0.5:1.5, and use ethanol as the ball milling medium for wet Mixed by ball milling for 6 hours to form LiMn 1.5 Ni 0.5 o 4 Slurry precursor; LiMn 1.5 Ni 0.5 o 4 After the slurry precursor was taken out, it was dried in a 60°C drying oven for 3 hours to complete the LiMn 1.5 Ni 0.5 o 4 The production process of the precursor; the prepared LiMn 1.5 Ni 0.5 o 4 The precursor is placed in a high-temperature muffle furnace, first sintered at 850°C for 16 hours, then the temperature in the high-temperature muffle furnace is lowered from 850°C to 620°C within 5 hours, and sintered at 620°C for 8 hours. Cool naturally to 25°C room temperature and take it out to form the LiMn of the present invention. 1.5 Ni 0.5 o 4-a Cathode material.

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Abstract

The invention relates to a preparing method of a LiMn<1.5>Ni<0.5>O<4-a> cathode material. The method includes a step of preparing lithium carbonate, nickel monoxide and manganese dioxide into a LiMn<1.5>Ni<0.5>O4 precursor. The method is characterized in that: the LiMn<1.5>Ni<0.5>O4 precursor is sintered at different temperature stages to complete preparation of the LiMn<1.5>Ni<0.5>O<4-a> cathode material. By adoption of the different temperature stages, the LiNi<0.5> Mn<1.5>O4 is subjected to heat processing. The degree of oxygen vacancies in a product is controlled without doping other elements so as to obtain the LiMn<1.5>Ni<0.5>O<4-a> material. The oxygen content in the molecular is reduced, thus achieving adjustment on material rate capacity, improving material conductivity and avoiding system homogeneity unbalance caused by doping other elements, allowing batch uniformity of the prepared material to be good, and facilitating industrial technology popularization of the product.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, in particular to a LiMn 1.5 Ni 0.5 o 4-a Preparation method of cathode material. Background technique [0002] In the 21st century, with the global energy crisis and environmental pollution caused by automobiles, governments of various countries have invested heavily in the development of new energy vehicles. New energy electric vehicles and hybrid vehicles have become the darlings of the times. At present, there are three main types of power batteries for electric vehicles: lead-acid batteries, nickel metal hydride batteries and lithium power batteries. From the perspective of future development trends, lithium-ion power batteries will become the mainstream and have broad application prospects. Correspondingly, the research and development of cathodes for key materials for lithium-ion power batteries must keep up with the requirements of the times. [0003] Lith...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 许寒刘兴江刘浩杰彭庆文卢志威任丽彬
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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