Lithium molybdate serving as secondary battery electrode material

An electrode material, secondary battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of no electrochemical activity, low first cycle efficiency, battery safety hazards, etc., to achieve good compatibility, high volume energy The effect of high density and production efficiency

Inactive Publication Date: 2015-04-29
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this material are (1) high charging voltage
Only when charged to 4.8V and above, the specific capacity of the material can be fully exerted, and the material has basically no electrochemical activity below 4.5V; (2) due to the fact that Mn below 4.8V 4+ It cannot continue to be oxidized, so the capacity of the material must be accompanied by the precipitation of oxygen, which will cause a safety hazard in the actual battery; (3) In the first cycle, the structure of the material changes from layered to spinel structure irreversibly Transformation, the lithium released by charging cannot be completely returned to the parent material, resulting in a lower first cycle efficiency; (4) Li 2 MnO 3 The electrical conductivity is low, and the lithium-ion battery using it as the positive electrode material can only cycle at a low rate

Method used

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  • Lithium molybdate serving as secondary battery electrode material
  • Lithium molybdate serving as secondary battery electrode material
  • Lithium molybdate serving as secondary battery electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0039] Synthesis of Li by a solid-state method 2 MoO 3 . Li 2 CO 3 and MoO 3 Mix according to the ratio of 1.05:1, and heat at 600°C for 10h to obtain Li 2 MoO 4 . will get Li 2 MoO 4 Placed in a tube furnace with Ar / H 2 Mixed gas, heat treatment at 600°C for 24h to obtain Li 2 MoO 3 powder. The typical XRD and SEM results of the obtained material are as follows figure 1 and 2 shown.

[0040] With the obtained Li 2 MoO 3 The powder is used as the electrode active material to prepare the positive electrode sheet and assemble the battery. The electrode sheet preparation, battery components and battery assembly processes are as described above. After the battery was left to stand for 4 hours, the battery was charged and discharged with a constant current (10mA / g) using a LAND tester. Li in Example 2 2 MoO 3 The charge-discharge curve of the first week is as follows image 3 shown. The charging and discharging conditions and cycle results are listed in Table...

Embodiment 5

[0042] Synthesis of Li by sol-gel method 2 MoO 3 . According to the ratio of 1.05:1 Li 2 CO 3 and MoO 3 Mix the powder evenly and add to 1mol / L citric acid aqueous solution. Stir for 12h. Then the mixed solution was heated to 80° C., stirred and dried for 24 hours to obtain a dry gel, which was placed in a muffle furnace for calcination at 450° C. for 2 hours to obtain a precursor. Finally, the precursor is placed in a tube furnace and passed through Ar / H 2 Mixed gas, heat treatment at 600°C for 24h to obtain Li 2 MoO 3 powder.

[0043] With the obtained Li 2 MoO 3 The powder is used as the electrode active material to prepare the positive electrode sheet and assemble the battery. Electrode sheet preparation, battery components and battery assembly are the same as above. After the battery was left to stand for 4 hours, the battery was charged and discharged with a constant current (10mA / g) using a LAND tester. The charging and discharging conditions and cycle res...

Embodiment 6

[0045] Synthesis of Li by co-precipitation method 2 MoO 3 . First put (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in an appropriate amount of deionized water and stirred, then Li 2 CO 3 solution and adjust its pH value to about 8 with ammonia water. The obtained precipitate was filtered, washed with deionized water, dried at 80° C. for 12 hours, and then calcined at 500° C. for 5 hours in a muffle furnace. The calcined product was ground and mixed with Li 2 CO 3 Mix evenly according to the ratio of 7.35:1, place in a tube furnace, pass Ar / H 2 Mixed gas, heat treatment at 600°C for 24h to obtain Li 2 MoO 3 powder.

[0046] With the obtained Li 2 MoO 3 The powder is used as the electrode active material to prepare the positive electrode sheet and assemble the battery. Electrode sheet preparation, battery components and battery assembly are the same as above. After the battery was left to stand for 4 hours, the battery was charged and discharged with a constant cur...

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Abstract

The invention discloses lithium molybdate serving as a secondary battery electrode material. In an execution mode, a chemical formula of the electrode material is Li (2-x)MoyMzO(3-u), wherein x is larger than or equal to minus 2 and smaller than or equal to 2, y is larger than 0 and smaller than or equal to 5, z is larger than or equal to 0 and smaller than or equal to 9, u is larger than or equal to minus 9 and smaller than or equal to 3, and M comprises one element selected from C, N, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Cd, In, Sn, Sb, Te, I, Cs, Ba, Ta, W, Re, Os, Ir, Pt, Au, Hg, Pb, Bi, Po, At, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu or combination of the elements. The electrode material is characterized by having very high specific capacity, excellent cycle performance, rate capability and safety.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to electrode materials for secondary batteries. Background technique [0002] With the gradual depletion of fossil energy such as coal, oil, and natural gas and the deteriorating environmental problems, clean energy has attracted much attention, such as solar energy, wind energy, and hydrogen energy. As the storage, transportation and use carrier of new clean energy, secondary batteries face huge development space. Among various secondary batteries, lithium-ion battery is an efficient electrical energy-chemical energy conversion device, which has been widely used in mobile phones, digital cameras, notebook computers and other portable electronic products and power tools. However, with the rapid development of electronic technology, increasingly powerful electronic products and power tools have gradually increased the performance requirements of lithium-ion batteries, while the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 马君王兆翔陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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