A method for prepare a lithium-rich manganese-based cathode material for lithium ion battery

A lithium-ion battery, lithium-rich manganese-based technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as reducing equipment utilization and production efficiency, affecting product performance consistency, and taking a long time in the cooling section. , to achieve the effect of improving equipment utilization and production efficiency, improving comprehensive electrochemical performance, and pore change

Inactive Publication Date: 2019-01-04
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the industrial production of lithium-ion cathode materials adopts the process of high-temperature sintering and cooling with the furnace, and the cooling section takes a lot of time, which reduces the utilization rate of equipment and production efficiency, and there will be uneven cooling that affects the consistency of product performance. Hidden danger

Method used

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  • A method for prepare a lithium-rich manganese-based cathode material for lithium ion battery
  • A method for prepare a lithium-rich manganese-based cathode material for lithium ion battery
  • A method for prepare a lithium-rich manganese-based cathode material for lithium ion battery

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Embodiment 1

[0035] Step 1. Weigh lithium carbonate and carbonate precursors according to the lithium metal ratio of 1.25:0.8, use alcohol as a dispersant, and the ball-to-material ratio is 10:1, and mix evenly by high-energy ball milling.

[0036] Step 2. Deballing and sieving the uniformly mixed materials, then placing them in a crucible and sintering in an industrial microwave oven. The sintering scheme is 500°C for 5 minutes and 900°C for 30 minutes.

[0037] Step 3. After the sintering is completed, quickly take out the crucible from the microwave oven cavity, then put the material into a container filled with liquid nitrogen, wait for the gas to dissipate, take out the material and put it in an oven to remove moisture, and finally sieve to obtain the final product.

Embodiment 2

[0057] Step 1. Weigh lithium carbonate and carbonate precursors according to the ratio of lithium metal to 1.25:0.8, and add additive nano-TiO 2 (the added amount of Ti is 0.2wt%), and the mixture is uniformly mixed by high-energy ball milling.

[0058] Step 2. Deballing and sieving the uniformly mixed materials, then placing them in a crucible and sintering in an industrial microwave oven. The sintering scheme is 500°C for 5 minutes and 900°C for 30 minutes.

[0059] Step 3. After the sintering is completed, quickly take out the crucible from the microwave oven cavity, then put the material into a container filled with liquid nitrogen, wait for the gas to dissipate, take out the material and put it in an oven to remove moisture, and finally sieve to obtain the final product.

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Abstract

The invention provides a preparation method of a lithium-rich manganese-based cathode material for a lithium ion battery, which comprises the following steps of: uniformly mixing carbonates of Mn, Niand Co, lithium sources and auxiliaries according to a certain proportion to obtain mixed powder; Sintering the mixed powder at 500 DEG C for 5 to 10 minutes, and then sintering at 700 to 1000 DEG C for 20 to 40 minutes; At that end of sinter, the powder is transfer into liquid nitrogen, liquid argon or liquid oxygen to be quenched, cooled, taken out and dried, and sieve to obtain a lithium-rich manganese-based cathode material for lithium ion batteries. As that quench after sinter of the invention can promote the shrinkage of the particles, so that that pore of the particles become small, More compact stacking, the vibrating density of the material particles is increased, The increase of vibrating density improves the machinability of the material, effectively enhances the energy densityof the cell system, at the same time, it can refine the grain size, increase the specific surface area of the material, improve the contact between the material and the electrolyte, and effectively enhance the comprehensive electrochemical properties of the material--in addition, it greatly improves the utilization rate of the equipment and the production efficiency.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium-rich manganese-based positive electrode material for lithium ion batteries and a preparation method. Background technique [0002] The current market has put forward higher and higher requirements for the energy density of lithium-ion batteries. "Made in China 2025" has put forward clear requirements for this. By 2025, the energy density of batteries should be greater than 300Wh / kg. Various cathode materials that have been commercialized at present, including LiCoO 2 , LiFePO 4 , LiMn 2 o 4 , NCM, whose specific capacity is close to the theoretical limit, so it is urgent to develop new cathode materials characterized by high specific capacity. Lithium-rich manganese-based cathode material is a newly developed cathode material in recent years. Its specific discharge capacity can reach 300mAh / g, which is nearly twice that of the above-mentioned materia...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 王伟刚石谦齐士博彭俊明陈小平
Owner 桑顿新能源科技(长沙)有限公司
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