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Orthorhombic manganese ore material and preparation method thereof, negative electrode and lithium battery

A technology of orthorhombic manganese and ore, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of negative electrode materials with low lithium content, rising material synthesis costs, and lack of lithium resources, etc., and achieve good electrical conductivity, low cost, The effect of saving lithium resources

Active Publication Date: 2016-04-13
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, Li 4 Ti 5 o 12 There are also shortcomings that are difficult to overcome: on the one hand, with Li 4 Ti 5 o 12 Lithium-ion batteries as the negative electrode have the problem of continuous flatulence due to the surface catalytic reaction during use and storage, which brings certain safety hazards; on the other hand, as the negative electrode material Li 4 Ti 5 o 12 The Li in the battery has not been utilized at all. With the wide application of lithium-ion batteries, the shortage of lithium resources will inevitably be brought about, and the raw material Li 2 CO 3 If the price rises, if Li in the material cannot be effectively utilized, it will inevitably lead to a waste of lithium resources and an increase in the cost of material synthesis
[0006] Currently, there is no Li 4 Ti 5 o 12 The same good cycle performance and safe voltage range, but the negative electrode material with extremely low lithium content

Method used

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  • Orthorhombic manganese ore material and preparation method thereof, negative electrode and lithium battery
  • Orthorhombic manganese ore material and preparation method thereof, negative electrode and lithium battery
  • Orthorhombic manganese ore material and preparation method thereof, negative electrode and lithium battery

Examples

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Embodiment 1

[0055] This embodiment is used to illustrate the LiVTiO provided by the invention 4 Materials and their method of preparation (solid-phase method).

[0056] In a dry atmosphere, weigh V at a molar ratio of 1:1:1 2 o 3 、TiO 2 , Li 2 CO 3 Each 0.615g, 0.655g, 0.303g. Mix evenly in a mortar, and then mix in a mixer with a rotating speed of 2000rpm-2800rpm for 10-20 minutes to obtain a mixture of the two. The mixture was then compressed into a tablet precursor on a tablet press with a pressure of 60 Mp. In a tube furnace, in a nitrogen atmosphere, the above precursor was heated from room temperature to 950 °C at a rate of 5 °C / min, kept at 950 °C for 10 hours, and then naturally cooled to room temperature to obtain a black solid. Its scanning electron microscope pictures are as Figure 7 , it can be seen that the particle size of the prepared material is between 1 and 20 μm. LiVTiO prepared from Fig. 4 The X-ray diffraction results of the material ( Figure 8 ) and refi...

Embodiment 2

[0059] This embodiment is used to illustrate the LiVTiO provided by the invention 4 Electrochemical properties of materials.

[0060] The above-mentioned negative electrode active material is prepared into a lithium ion battery. The specific steps are: the prepared negative electrode active material LiVTiO 4 Mix the powder with acetylene black and binder PVDF in a weight ratio of 80:10:10, add an appropriate amount of NMP solvent, grind in a dry environment at room temperature to form a slurry, and then evenly coat the slurry on the current collector copper foil , cut into 8×8mm pole pieces after drying, dried at 100°C for 10 hours under vacuum conditions, and then transferred into a glove box for later use. The assembly of the simulated battery was carried out in an Ar atmosphere glove box, with metal lithium sheet as the counter electrode, 1M LiPF 6 / EC+DEC (ethylene carbonate + diethyl carbonate) solution is used as the electrolyte and assembled into a CR2032 button batt...

Embodiment 3

[0063] This embodiment is used to illustrate the LiV provided by the invention 0.99 Cr 0.01 TiO 4 Materials and their method of preparation (solid-phase method).

[0064] In a dry atmosphere, weigh V 2 o 3 、TiO 2 , Li 2 CO 3 、Cr 2 o 3 Each 0.615g, 0.655g, 0.300g, 0.003g. Mix well in a mortar, and then mix in a mixer with a rotation speed of 2000rpm-2800rpm for 10-20 minutes. The mixture was then compressed into a tablet precursor on a tablet press with a pressure of 60 Mp. In a tube furnace, in a nitrogen atmosphere, the above precursor was heated from room temperature to 950 °C at a rate of 5 °C / min, kept at 950 °C for 8 hours, and then naturally cooled to room temperature to obtain a black solid.

[0065] The assembly of the positive electrode, negative electrode, electrolyte and battery of the simulated battery prepared by the method of Example 1 is the same as in Example 1, and its first week charge-discharge curve is listed in Figure 12 .

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Abstract

The invention discloses a rhombic manganese ore material and a preparation method, a cathode and a lithium battery. According to the invention, a general formula of the rhombic manganese ore material is LiVxL(1-x)TiyM(1-y)O4. The rhombic manganese ore active electrode material can reduce the lithium content of a cathode material on one hand, the lithium resource is saved. A Li2CO3 raw material required by the material is reduced, thereby the preparation cost of the material can be greatly reduced. On the other hand, the material has a safe voltage scope which is similar with that of Li4Ti5O12, and can be a substitution material of Li4Ti5O12 with cycle stability.

Description

technical field [0001] The invention relates to a manganese ore material and its preparation method and application. Background technique [0002] Lithium-ion batteries are currently widely used in various portable devices, and have been used in small batches in electric vehicles and energy storage battery packs. These applications also have higher and higher requirements for the performance of lithium-ion batteries, such as high energy Density, high power density, rate performance, cycle stability, safety, etc. [0003] At present, the positive electrode material used in commercially available batteries is mainly LiFePO 4 、LiCoO 2 , LiMn 2 o 4 etc., the negative electrode material is mainly graphite-like carbon material. In recent years, spinel Li 4 Ti 5 o 12 As an anode material, it has aroused great interest due to its safe voltage range and good cycle performance. [0004] However, Li 4 Ti 5 o 12 There are also shortcomings that are difficult to overcome: on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M10/0525
CPCH01M4/131H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 胡勇胜余觉知王跃生穆林沁李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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