A kind of modified lithium ion battery cathode material and preparation method thereof

A technology of lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in practical application, high price, and capacity loss, and achieve improved air storage performance, improved electrochemical performance, and energy saving The effect of raw material costs

Active Publication Date: 2018-06-19
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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  • A kind of modified lithium ion battery cathode material and preparation method thereof
  • A kind of modified lithium ion battery cathode material and preparation method thereof
  • A kind of modified lithium ion battery cathode material and preparation method thereof

Examples

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Embodiment 1

[0033] A modified lithium ion battery cathode material of the present invention, comprising a cathode material bulk LiNi 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 tungsten molybdate layer on the surface, in which lithium tungsten 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 the present embodiment comprises the following steps:

[0035] 1) Add lithium acetate and APT, an intermediate product that has not undergone molybdenum removal, into water to form a solution.

[0036] 2) LiNi 0.5 co 0.2 mn 0.3 o 2 (the amount added is based on lithium tungstomolybdate and LiNi 0.5 co 0.2 mn 0.3 o 2 The mass ratio is 3:100) added to the solution after step 1), stirred evenly at a constant temperature of 50°C, and then dried in a blast drying oven at 150°C to obtain a precursor.

[0037] 3) The precursor was heated up to 350° C. a...

Embodiment 2

[0040] A modified lithium ion battery cathode material of the present invention, comprising a cathode material bulk LiNi 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 tungsten molybdate layer on the surface, in which lithium tungsten 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 the present embodiment comprises the following steps:

[0042] 1) LiOH, H 2 WO 4 and H 2 MoO 4 It is dissolved in a mixture of water and alcohol to form a solution.

[0043] 2) LiNi 0.8 co 0.1 mn 0.1 o 2 (the amount added is based on lithium tungstomolybdate 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 evenly at a constant temperature of 50°C, and then dried in a blast drying oven at 120°C to obtain a precursor.

[0044] 3) The precursor was heated up to 350° C. at a heating rate of ...

Embodiment 3

[0050] A modified lithium-ion battery positive electrode material of the present invention, comprising a positive electrode material bulk Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 and wrapped in Li 1.2 mn 0.54 co 0.13 Ni 0.13 o 2 The lithium tungsten molybdate layer on the surface, in which the lithium tungsten molybdate 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 the present embodiment comprises the following steps:

[0052] 1) 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 amount added is based on lithium tungstomolybdate 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 evenly at a constant temperature of 80°C, and then dried in a blast drying oven at 120°C to ob...

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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 in particular relates to a modified lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Since tungsten and molybdenum are very similar in terms of atomic outer electron arrangement and ionic radius, the state of tungsten and molybdenum compounds in aqueous solution is also very similar. In alkaline solution, the common valence state of tungsten and molybdenum is +6 Price, usually in WO 4 2- and Mo 4 2- Existence, isopolyacids and heteropolyacids are easily formed in weakly alkaline and acidic solutions, and the behavior of tungsten and molybdenum compounds in solutions 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 has become a difficult proble...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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