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Method for preparing doped lithium manganese oxide

A production method and technology of lithium heteromanganate, applied in the field of electrochemistry, can solve the problems of complex liquid phase method, high production cost, difficult control of the reaction process, etc., and achieve easy control of the reaction process, low production cost and simple process. Effect

Inactive Publication Date: 2014-11-05
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Synthesis of LiM x mn 2-x o 4 The method has solid-phase method and liquid-phase method etc., described solid-phase method has technique simple, reaction process is easy to control, the advantage of low production cost, but its biggest shortcoming is: the formed LiM x mn 2-x o 4 The particle size distribution is not uniform; the LiM formed by the liquid phase method x mn 2-x o 4 The particle size distribution is relatively uniform, but the liquid phase method is not suitable for large-scale application due to the disadvantages of complex process, difficult control of the reaction process, and high production cost.

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  • Method for preparing doped lithium manganese oxide
  • Method for preparing doped lithium manganese oxide
  • Method for preparing doped lithium manganese oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] What made in the present embodiment is undoped pure lithium manganese oxide, and concrete process is as follows:

[0054] Measure 0.01mol of CH 3 COOLi·2H 2 O and 0.02mol of Mn(CH 3 COO) 2 4H 2 O, also can make the amount of above-mentioned two kinds of substances slightly more, to adapt to the amount lost due to volatilization or other reasons in the reaction process. When measuring specifically, you can weigh 1.0712g (about 0.01mol) CH 3 COOLi·2H 2 O and 4.9018g (about 0.02mol) Mn(CH 3 COO) 2 4H 2 O, put the measured substance in a mortar and grind it thoroughly to form a homogeneous mixture; then put the mixture into a 100ml beaker, and heat the beaker so that the mixture melts into a liquid state at 120°C mixture, and keep it warm for 2 hours; then put the beaker into the muffle furnace, make the muffle furnace heat up to 500°C at a speed of 3°C / min, and pre-burn the mixture in the beaker at 500°C to make it become The powdery substance is then kept at 500...

Embodiment 2

[0059] Relative to embodiment one, what is made in the present embodiment is nickel-doped lithium manganate, and the specific process is as follows:

[0060] Weigh 0.9692g (about 0.01mol) CH 3 COOLi·2H 2 O, 1.2442g (about 0.005mol) Ni(CH 3 COO) 2 4H 2 O and 3.6764g (about 0.015mol) Mn(CH 3 COO) 2 4H 2 O, put the weighed substance in a mortar and grind it thoroughly to form a homogeneous mixture; then put the mixture into a 100ml beaker, and heat the beaker so that the mixture melts into a liquid state at 120°C mixture, and keep it warm for 2 hours; then put the beaker into the muffle furnace, make the muffle furnace heat up to 500°C at a speed of 3°C / min, and pre-burn the mixture in the beaker at 500°C to make it become powdery material, and then kept at 500°C for 5 hours to decompose the powdery material in the beaker into organic components and initially form LiNi 0.5 mn 1.5 o 4 ;Finally, grind the pre-fired powdery substance evenly again, and heat the muffle furna...

Embodiment 3

[0065] Compared with the second embodiment, what is made in the present embodiment is the doped lithium manganese oxide after nickel and chromium, and the specific process is as follows:

[0066] Measure 1.0202g (about 0.01mol) CH 3 COOLi·2H 2 O, 1.1198g (about 0.0045mol) Ni(CH 3 COO) 2 4H 2 O, 3.5538g (about 0.0145mol) Mn(CH 3 COO) 2 4H 2 O and 0.4002g (about 0.001mol) Cr(NO 3 ) 3 9H 2 O, the subsequent manufacturing process is similar to that described in Embodiment 1 and Embodiment 2, and will not be repeated here. The final doped lithium manganese oxide is LiNi 0.45 Cr 0.1 mn 1.45 o 4 , the prepared LiNi 0.45 Cr 0.1 mn 1.45 o 4 As the positive electrode material of the lithium ion battery, the lithium ion battery is tested to obtain the data in Table 3.

[0067] Table three

[0068] Cycles

[0069] Reference Table Three and image 3 and Figure 4 , the corresponding data of the number of cycles, discharge specific capacity and coulombic effi...

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Abstract

The invention discloses a method for preparing doped lithium manganese oxide. The method comprises the following steps: weighing a manganese compound, a lithium compound and a metal compound in a preset ratio; mixing and grinding the manganese compound, the lithium compound and the metal compound to form a mixture; heating the mixture to a first temperature to melt the mixture into a raw material in a molten state, and keeping the first temperature for a first period of time; placing the raw material in the molten state into a sintering furnace to be heated to a second temperature, presintering at the second temperature to form powder, and keeping the second temperature for a second period of time; and grinding the powder and heating the powder to a third temperature, sintering at the third temperature, and keeping the third temperature for a third period of time. By applying the method provided by the invention, the particle size distribution of the prepared doped lithium manganese oxide is uniform, and the advantages of simple technological process, easy control on reaction process and low production cost and the like are achieved. Thus, the method can be applied in a large scale.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, and more specifically, relates to a preparation method of doped lithium manganese oxide. Background technique [0002] Lithium-ion battery was developed by Sony Corporation of Japan in 1990 and gradually commercialized. Its appearance can be regarded as a leap in the history of secondary batteries. Compared with other batteries, lithium-ion batteries have the following advantages: First, high open-circuit voltage: the open-circuit voltage of commercially available lithium-ion batteries is mostly 3.6V, while the open-circuit voltage of nickel-metal hydride and nickel-cadmium secondary batteries is only 1.2V ; Second, large specific capacity: the specific capacity of lithium-ion batteries is 2.5 times that of nickel-cadmium secondary batteries and 1.5 times that of nickel-hydrogen secondary batteries; third, low self-discharge rate: the self-discharge rate of lithium-ion batteries is less ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 陈春华冯绪勇丁宁
Owner UNIV OF SCI & TECH OF CHINA