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Method for producing high-rate spherical lithium manganate

A spherical lithium manganate, high-rate technology, applied in the field of nanomaterials, can solve the problems that limit the wide application and development of lithium manganate, affect the cycle performance and rate performance of lithium manganate, and structural changes, etc., to achieve excellent cycle stability and The effect of rate performance, easy large-scale preparation, and mild reaction conditions

Inactive Publication Date: 2018-08-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a typical positive electrode material for lithium-ion batteries, lithium manganate has become a hot research material due to its abundant resources, simple synthesis, safety and environmental protection, etc. However, lithium manganate will have crystal structure stability and reversibility during charging and discharging. Poor, resulting in poor cycle performance and rapid capacity fading of lithium manganate, which directly limits the wide application and development of lithium manganate in lithium-ion batteries
Generally speaking, the main reasons that affect the cycle performance and rate performance of lithium manganate are: (1) The manganese salt is easily dissolved during the charge and discharge process, resulting in changes in its structure
(2) During the preparation process, impurity phases are easy to appear, thus affecting the stability of the phase structure
(3) The electrolyte is easily decomposed
(4) The material itself has Jahn-Teller effect
[0004] So far, there have been few reports on the preparation of spherical lithium manganate precursors by combining sand milling technology with electrospray technology, and then preparing spherical lithium manganate by subsequent heat treatment

Method used

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  • Method for producing high-rate spherical lithium manganate
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  • Method for producing high-rate spherical lithium manganate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0043]First, configure 0.4mol / L NaOH solution, weigh 2g of manganese salt, and then dissolve it into 1000 mL of deionized water solution, mix the two solutions of alkaline NaOH solution and manganese salt, and pass the metering pump At the same time, it was added to the reaction tank and stirred with air for 3h. Then the obtained product was washed three times with deionized water and ethanol respectively, and finally the product was placed in a vacuum drying oven to dry for 10 h.

[0044] Secondly, weigh the lithium salt and the above-mentioned prepared product according to the stoichiometric ratio of 1.1:1, add the above-mentioned powder into the sand mill tank, and sand mill for 10 hours (when sand milling, the control speed is 1200 rpm), A homogeneously mixed powder is obtained, which is dried.

[0045] Again, the product obtained above was dissolved into ethanol, propylene glycol, and ethylene glycol with a volume ratio of 1:2:2, placed in an ultrasonic wave for 25 minut...

Embodiment approach 2

[0049] First, configure 0.4mol / L NaOH solution, weigh manganese salt and nickel salt according to the stoichiometric ratio of 1:0.1, then dissolve it in 1000mL deionized aqueous solution, and mix alkaline NaOH solution with nickel salt and manganese salt The mixed solutions of the mixture are mixed together, and the metering pump is added to the reaction tank at the same time, and the air is introduced and stirred for 3 to 5 hours. Then the obtained product was washed three times with deionized water and ethanol respectively, and finally the product was placed in a vacuum drying oven to dry for 10 h.

[0050] Secondly, weigh the lithium salt and the product respectively according to the stoichiometric ratio of 1.1:1, add the above powder into the sand mill tank, and sand mill for 10 hours (during the sand mill treatment, the control speed is 1500 rpm) to obtain a uniform mixture. powder, which is dried.

[0051] Again, the product obtained above was dissolved into ethanol, pr...

Embodiment approach 3

[0055] First, configure 0.4mol / L NaOH solution, weigh manganese salt and cobalt salt according to the stoichiometric ratio of 1:0.1, then dissolve it in 1000mL deionized aqueous solution, and mix alkaline NaOH solution with cobalt salt and manganese salt Mix the two solutions together, put the metering pump into the reaction tank at the same time, and stir with air for 3 hours. Then the obtained product was washed three times with deionized water and ethanol respectively, and finally the product was placed in a vacuum drying oven to dry for 10 h.

[0056] Secondly, weigh the lithium salt and the product respectively according to the stoichiometric ratio of 1.1:1, add the above-mentioned powder into the sand mill tank, and sand mill for 10 hours (during sand milling, the control speed is 1800 rpm) to obtain a uniform mixture. powder, which is dried.

[0057] Again, the product obtained above was dissolved into ethanol, propylene glycol, and ethylene glycol with a volume ratio ...

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Abstract

The invention discloses a method for producing high-rate spherical lithium manganate. The method comprises the following steps that 1, water-soluble manganese salt is added into alkali liquid; mixingis performed to obtain a precipitate; washing and drying are performed to obtain a spare material; or water-soluble doped metal salt M and water-soluble manganese salt are added into the alkali liquid; mixing is performed to obtain a precipitate, and a spare material is obtained; 2, a lithium source and the spare material obtained in the first step are prepared and taken; the sanding treatment isperformed to obtain a mixture subjected to sanding; 3, the mixture subjected to sanding obtained in the second step is mixed with liquid to be prepared into slurry; 4, the slurry obtained in the thirdstep is used as raw materials; spherical precursor powder is prepared by an electronic injection technology; 5, under the oxygen-containing condition, the spherical precursor powder obtained in the fourth step is subjected to heat treatment; the high-rate spherical lithium manganate is obtained. The method has the advantages that the process is simple; the quality of the obtained product is controllable; the performance is excellent; the large-scale industrial application is convenient.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a method for producing high-magnification spherical lithium manganate. Background technique [0002] In modern life with continuous economic and social development, people's demand for electronic devices such as mobile phones and notebooks, as well as electric bicycles and electric vehicles is gradually increasing. Non-renewable resources such as oil and natural gas are far from meeting human needs. Lithium Ion batteries have attracted more and more attention in the field of power batteries due to their advantages such as high operating voltage, long cycle life, and low self-discharge rate. The requirements for ion batteries have also increased. As a typical positive electrode material for lithium-ion batteries, lithium manganate has become a hot research material due to its abundant resources, simple synthesis, safety and environmental protection, etc. However, lithium manganate wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M10/0525
CPCH01M4/505H01M10/0525Y02E60/10
Inventor 陈立宝韦伟峰卫月华周钢李志钦吴吉强
Owner CENT SOUTH UNIV