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Ternary positive electrode material with double-layer coating structure on surface, and preparation method thereof

A positive electrode material, double-layer coating technology, applied in the field of ternary positive electrode material and its preparation, can solve the problems of no effect on the improvement of battery rate performance, structural damage of positive electrode active material, collapse of surface structure, etc. Secondary sintering process, excellent electrical conductivity, the effect of mitigating structural changes

Active Publication Date: 2021-01-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, the rate performance is slightly worse than that of lithium cobalt oxide and other materials; second: due to the corrosion of hydrogen fluoride generated by the decomposition of the electrolyte, the nickel, cobalt, and manganese transition metals in the ternary material will dissolve from the electrode into the electrolyte to form a surface structure Collapse, poor cycle performance
Third: During the charging and discharging process of the battery, with the occurrence of side reactions, the structure of the positive electrode active material will be damaged to a certain extent
However, the modification of nickel-cobalt-manganese ternary materials with only a single coating on the surface can effectively alleviate the dissolution of metal ions, reduce the corrosion of active materials by HF, and improve battery cycle performance, but it has no effect on the improvement of battery rate performance.

Method used

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  • Ternary positive electrode material with double-layer coating structure on surface, and preparation method thereof
  • Ternary positive electrode material with double-layer coating structure on surface, and preparation method thereof
  • Ternary positive electrode material with double-layer coating structure on surface, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] A method for preparing a ternary positive electrode material with a double-layer coating structure on the surface, comprising the steps of:

[0026] S1. Preparation of surface-coated MoS 2 Ternary material precursors for nanosheet coating:

[0027] 1mol sodium molybdate (Na 2 MoO 4 . h 2 O), 6mol thioacetamide (C 2 h 5 NS) and 1mol hydrated silicotungstic acid and 4kg of ternary precursor Ni 0.85 co 0.1 mn 0.05 (OH) 2 (x+y+z=1) was dissolved in deionized water, and continuously stirred for 2h, wherein the mass ratio of ternary precursor to deionized water was 1:3; Heating at high temperature for 24h. After vacuum filtration and washing, the precipitate was vacuum-dried in an oven at 100°C for 6 hours to obtain the surface-coated MoS 2 Ternary material precursor for nanosheet coating;

[0028] S2, prepare Al(OH) 3 Cladding:

[0029] Coating the surface in step S1 with MoS 2 The ternary material precursor of the nanosheet coating layer was added to deioniz...

Embodiment 2

[0033] A method for preparing a ternary positive electrode material with a double-layer coating structure on the surface, comprising the steps of:

[0034] S1. Preparation of surface-coated MoS 2 Ternary material precursors for nanosheet coating:

[0035] 1mol sodium molybdate (Na 2 MoO 4 . h 2 O), 6mol thioacetamide (C 2 h 5 NS) and 1mol hydrated silicotungstic acid (H 4 [SiO 4 (W 3 o 9 ) 4 ]·xH 2 O) and 5kg of ternary precursor Ni 0.85 co 0.1 mn 0.05 (OH) 2 (x+y+z=1) was dissolved in deionized water, and continuously stirred for 2h, wherein the mass ratio of ternary precursor to deionized water was 1:3; Heating at high temperature for 24h. After vacuum filtration and washing, the precipitate was vacuum-dried in an oven at 100°C for 6 hours to obtain the surface-coated MoS 2 Ternary material precursor for nanosheet coating;

[0036] S2, prepare Al(OH) 3 Cladding:

[0037] Coating the surface in step S1 with MoS 2 The ternary material precursor of the nan...

Embodiment 3

[0041] A method for preparing a ternary positive electrode material with a double-layer coating structure on the surface, comprising the steps of:

[0042] S1. Preparation of surface-coated MoS 2 Ternary material precursors for nanosheet coating:

[0043] 1mol sodium molybdate (Na 2 MoO 4 . h 2 O), 6mol thioacetamide (C 2 h 5 NS) and 1mol hydrated silicotungstic acid (H 4 [SiO 4 (W 3 o 9 ) 4 ]·xH 2 O) and 6kg of ternary precursor Ni 0.85 co 0.1 mn 0.05 (OH) 2 (x+y+z=1) was dissolved in deionized water, and continuously stirred for 2h, wherein the mass ratio of ternary precursor to deionized water was 1:3; Heating at high temperature for 24h. After vacuum filtration and washing, the precipitate was vacuum-dried in an oven at 100°C for 6 hours to obtain the surface-coated MoS 2 Ternary material precursor for nanosheet coating;

[0044] S2, prepare Al(OH) 3 Cladding:

[0045] Coating the surface in step S1 with MoS 2 The ternary material precursor of the nan...

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Abstract

The invention discloses a ternary positive electrode material with a double-layer coating structure on the surface, and a preparation method thereof. MoS2 nanosheets are synthesized on the surface ofa ternary material precursor through an in-situ generation method, MoS2 is of an ABA sandwich layered structure composed of two S layers and one Mo layer, the adjacent layers interact through Van derWaals' force, and good chemical stability is realized; in addition, MoS2 also has excellent conductivity, so that the transmission efficiency of electrons and lithium ions between the electrode and the electrolyte can be improved; besides, the surface layer of the material is coated with a layer of Al2O3, so that the structural change of the positive electrode material in the charging and discharging processes can be relieved, the interface electrochemical reaction environment can be effectively optimized, and the cycling stability of the ternary material is improved. The prepared material hasgood electronic conductivity and structural stability, the interface electrochemical reaction environment can be effectively optimized, and the multiplying power and the cycle performance of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a ternary positive electrode material with a double-layer coating structure on the surface and a preparation method thereof. Background technique [0002] Lithium-ion battery ternary cathode material is considered to be the most promising next-generation high-energy lithium-ion battery cathode material due to its high energy density, and has become the development focus of the industry at this stage. However, nickel-cobalt-manganese ternary materials generally have some problems that need to be solved urgently. First, the rate performance is slightly worse than that of lithium cobalt oxide and other materials; second: due to the corrosion of hydrogen fluoride generated by the decomposition of the electrolyte, the nickel, cobalt, and manganese transition metals in the ternary material will dissolve from the electrode into the electrolyte to form a surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 汪宇郑刚刘汉康林浩张迎霞鲁劲华
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY