Foamed lithium-enriched manganese-based layered oxide and low-temperature fused salt preparation method

A technology rich in lithium manganese and oxides, applied in the field of lithium battery material preparation, can solve the problems of energy waste, slow conduction rate, long sintering time, etc., and achieve the effects of low reaction temperature, short time, and low energy consumption cost

Active Publication Date: 2017-05-10
北京创能惠通科技有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

But this sintering method belongs to the sintering between solid phases, Li + The conduction rate is slower and the sintering time is longer, resulting in energy waste

Method used

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  • Foamed lithium-enriched manganese-based layered oxide and low-temperature fused salt preparation method
  • Foamed lithium-enriched manganese-based layered oxide and low-temperature fused salt preparation method
  • Foamed lithium-enriched manganese-based layered oxide and low-temperature fused salt preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment is used to illustrate the sintering process of the electrode active material:

[0049] This implementation uses mixed lithium salts to sinter to prepare the electrode active material Li 1.2 mn 0.71 Ni 0.21

[0050] co 0.088 o 2 , the specific steps are: the foamed lithium-rich manganese-based layered oxide precursor Mn prepared by the co-precipitation method 0.71 Ni 0.21 co 0.088 (OH) 2 Mixed salt of powder and lithium hydroxide and lithium nitrate mixed in a certain proportion and then press Li 1.2 mn 0.71 Ni 0.21 co 0.088 o 2 The stoichiometric percentage of the mix. After mixing, treat at 250°C for 5 hours in an air atmosphere, then treat at 900°C for 10 hours after cooling, and then cool to room temperature. The resulting active substance Li 1.2 mn 0.71 Ni 0.21 co 0.088 o 2 products such as figure 1 , after grinding to obtain a powder for use, such as figure 2 . image 3 It is the XRD pattern of the obtained foamed lithium-rich...

Embodiment 2

[0052] This embodiment is used to illustrate the sintering process of the electrode active material:

[0053] This implementation uses mixed lithium salts to sinter to prepare the electrode active material Li 1.2 mn 0.71 Ni 0.21 co 0.088 o 2 , the specific steps are: the foamed lithium-rich manganese-based layered oxide precursor Mn prepared by the co-precipitation method 0.71 Ni 0.21 co 0.088 (OH) 2 Mixed salt of powder and lithium hydroxide and lithium nitrate mixed in a certain proportion and then press Li 1.2 mn 0.71 Ni 0.21 co 0.088 o 2 The stoichiometric percentage of the mix. After mixing, treat at 250°C for 5 hours in an air atmosphere, take it out of the furnace after cooling, and press it into a sheet of appropriate size in a mold, then treat at 900°C for 10 hours, and then cool to room temperature. After grinding, the resulting foamed lithium-rich manganese-based layered oxide Li 1.2 mn 0.71 Ni 0.21 co 0.088 o 2 .

Embodiment 3

[0055] This example is used to illustrate the preparation of electrode sheets and batteries.

[0056] Prepare the lithium-ion battery from the pressed and unpressed active materials in the above-mentioned sintering process. The specific steps are: the prepared electrode active material Li 1.2 mn 0.71 Ni 0.21 co 0.088 o 2 Mix the powder with acetylene black and binder PVDF in a weight ratio of 80:10:10, add an appropriate amount of NMP solution, stir in a dry environment at room temperature to form a slurry, and then evenly coat the slurry on the current collector aluminum foil respectively As the positive pole piece, it was dried at 100°C for 10 hours under empty conditions, and cut into pole pieces with a diameter of 10 mm after drying, weighed and recorded, and then transferred into a glove box for future use. The assembly of the simulated battery was carried out in an Ar atmosphere glove box, using 1M LiPF6 / EC+DEC (EC:DEC=1:1) solution as the electrolyte, and the negati...

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Abstract

The invention discloses a foamed lithium-enriched manganese-based layered oxide and a low-temperature fused salt preparation method and belongs to the technical field of lithium battery material preparation. The foamed lithium-enriched manganese-based layered oxide has a foamed structure and has structural features of 'twin domain' and one of the structural features of the 'twin domain' is a monoclinal Li2MnO3-like layered structure domain, the rest is diamond LiTMO2, TM is transition metal, at least three transition metals are included, and one of the transition metals is Mn. The foamed- lithium-enriched manganese-based layered oxide is prepared by sintering mixed lithium salt and a lithium-enriched material precursor. Capacity of a lithium ion battery assembled by an electrode material prepared from active substance obtained by the method can reach 300mAh/g, and the lithium ion battery has high coulombic efficiency and circulating stability, has high first-circle coulombic efficiency at 55 DEG C and is higher than lithium ion batteries assembled by a lithium-enriched material obtained by sintering lithium salt in capacity and circulating stability.

Description

[0001] Technical field: [0002] The invention provides a preparation technology of a foamed lithium-rich manganese-based layered oxide and a low-temperature molten salt, belonging to the technical field of lithium battery material preparation. [0003] Background technique: [0004] Nowadays, the energy problem has become a worldwide problem, and the dwindling of fossil energy is constantly urging human beings to need new energy supplies. Vehicles can be said to be a major "main force" of fossil energy consumption, and the emergence of new energy vehicles can effectively alleviate the problem of fossil energy consumption caused by ordinary vehicles. As a power battery for new energy vehicles, lithium-ion batteries have strong advantages. It has the advantages of high specific energy, stable working voltage, wide working temperature range and long service life. It is one of the most concerned chemical power sources in current energy research. one. [0005] With the developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/505H01M10/0525Y02E60/10
Inventor 尉海军吴天昊
Owner 北京创能惠通科技有限公司
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