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Modified lithium-ion battery cathode material and preparation method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficult practicality, high price, capacity loss, etc., to improve air storage performance, improve electrochemical performance, and save energy. The effect of raw material cost

Active Publication Date: 2015-12-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

LiNiO 2 It has the disadvantages of difficult synthesis, structural phase transition and poor thermal stability, so it is difficult to be practical
Cathode material LiMPO 4 , has been widely studied due to its non-toxicity, low cost, and good stability, but its large-scale use is limited by its shortcomings such as poor electrical conductivity and low volumetric energy density.
LiCoO 2 China's cobalt resources are limited and expensive
Spinel-type LiMn 2 o 4 The material is low in cost and has good electronic and ionic conductivity, but in the charging process Mn 3+ Due to the existence of the Jahn-Teller effect, the ions cause an irreversible phase transition from spinel to tetrahedral manganese oxide, resulting in capacity loss; in addition, spinel LiMn 2 o 4 The capacity is low and the high temperature performance is poor
In addition, these cathode materials also have common disadvantages such as poor storage in air and unstable storage structure in the charged electrolyte.

Method used

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  • Modified lithium-ion battery cathode material and preparation method thereof
  • Modified lithium-ion battery cathode material and preparation method thereof
  • Modified lithium-ion battery cathode material and preparation method thereof

Examples

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Embodiment 1

[0033] A modified lithium ion battery positive electrode material of the present invention includes LiNi as the positive electrode material body 0.5 Co 0.2 Mn 0.3 O 2 And coated in LiNi 0.5 Co 0.2 Mn 0.3 O 2 Lithium tungstate molybdate layer on the surface, in which the lithium tungstate molybdate layer and LiNi 0.5 Co 0.2 Mn 0.3 O 2 The mass ratio is 3:100.

[0034] The preparation method of the modified lithium ion battery cathode material of this embodiment includes the following steps:

[0035] 1) APT, an intermediate product of lithium acetate and tungsten metallurgical process that has not been removed from molybdenum, is added to water to form a solution.

[0036] 2) Put LiNi 0.5 Co 0.2 Mn 0.3 O 2 (The added amount is based on lithium tungstate molybdate and LiNi 0.5 Co 0.2 Mn 0.3 O 2 The mass ratio is calculated by the amount of 3:100) added to the solution after step 1), after stirring uniformly at a constant temperature of 50°C, it is placed in a blast drying oven at 150°C f...

Embodiment 2

[0040] A modified lithium ion battery cathode material of the present invention, comprising LiNi as the cathode material body 0.8 Co 0.1 Mn 0.1 O 2 And coated in LiNi 0.8 Co 0.1 Mn 0.1 O 2 Lithium tungstate molybdate layer on the surface, in which the lithium tungstate molybdate layer and LiNi 0.8 Co 0.1 Mn 0.1 O 2 The mass ratio is 0.5:100.

[0041] The preparation method of the modified lithium ion battery cathode material of this embodiment includes the following steps:

[0042] 1) Put LiOH, H 2 WO 4 And H 2 MoO 4 Add the mixture of water and alcohol to dissolve to form a solution.

[0043] 2) Put LiNi 0.8 Co 0.1 Mn 0.1 O 2 (The added amount is based on lithium tungstate molybdate and LiNi 0.8 Co 0.1 Mn 0.1 O 2 The mass ratio is 0.5:100) added to the solution after step 1), stirred at a constant temperature of 50°C, and then placed in a blast drying oven at 120°C for drying to obtain a precursor.

[0044] 3) The precursor is heated to 350°C at a heating rate of 5°C / min for firing fo...

Embodiment 3

[0050] A modified lithium ion battery positive electrode material of the present invention, comprising a positive electrode material body Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 And coated in Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 The lithium tungstomolybdate layer on the surface, in which the lithium tungstomolybdate layer and Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 The mass ratio is 2:100.

[0051] The preparation method of the modified lithium ion battery cathode material of this embodiment includes the following steps:

[0052] 1) Put lithium acetate, (NH 4 ) 10 W 12 O 41 ·NH 2 O and (NH 4 ) 2 MoO 4 Add ammonia to dissolve to form a solution.

[0053] 2) Put Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 (The addition amount is based on lithium tungstate molybdate and Li 1.2 Mn 0.54 Co 0.13 Ni 0.13 O 2 The mass ratio is 2:100) added to the solution after step 1), stirred at a constant temperature of 80°C, and then placed in a blast drying oven at 120°C for drying to obtain a precursor.

[0054] 3) The precu...

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Abstract

The invention discloses a modified lithium-ion battery cathode material, which comprises a cathode material body and a lithium tungstomolybdic acid layer, wherein the lithium tungstomolybdic acid layer coats the surface of the cathode material body; and the mass ratio of the lithium tungstomolybdic acid layer to the cathode material body is (0.5-5) to 100. A preparation method comprises the following steps: (1) adding a lithium salt and a tungsten-molybdenum source to a solvent, and dissolving the lithium salt and the tungsten-molybdenum source to form a solution; (2) adding the cathode material body to the solution obtained from the step (1), stirring the cathode material evenly at constant temperature and drying the cathode material to obtain a precursor; and (3) heating the precursor to 250-550 DEG C, and roasting and cooling the precursor, so as to obtain the modified lithium-ion battery cathode material. According to the modified lithium-ion battery cathode material disclosed by the invention, the lithium tungstomolybdic acid layer coats the surface of the battery cathode material; CO2, H2O and electrolyte in air can be relatively well isolated; and the air storage performance of the material, the high-temperature electrolyte storage performance and the electrochemical cycling stability of the material are greatly improved.

Description

Technical field [0001] The invention belongs to the field of metallurgical electrode materials, and particularly relates to a modified lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Because tungsten and molybdenum are very similar in terms of the electron arrangement and ion radius of the outer layer of the atom, the states of tungsten and molybdenum compounds in aqueous solutions are also very similar. In alkaline solutions, the common valence states of tungsten and molybdenum are both +6 Price, usually in WO 4 2- And Mo 4 2- Exist, it is easy to form homopolyacids and heteropolyacids in weakly alkaline and acidic solutions. The behavior of tungsten and molybdenum compounds in solution is similar, which brings great difficulties to the separation of tungsten and molybdenum in tungsten and molybdenum smelting. Therefore, in the smelting process of tungsten and molybdenum, the separation of tungsten and molybdenum ha...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李新海郑小波王志兴郭华军黄振军彭文杰胡启阳
Owner CENT SOUTH UNIV
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