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Lithium-enriched manganese-based anode material with fast ion conductor coating layer and surface heterostructure and preparation method of lithium-enriched manganese-based anode material

A lithium-rich manganese-based, positive electrode material technology, applied in the direction of structural parts, battery electrodes, electrical components, etc., can solve the problems of difficult industrial production of the preparation process, and achieve the convenience of large-scale industrial production, low manufacturing cost, and reproducibility Good results

Active Publication Date: 2014-07-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the harsh preparation process makes it difficult to carry out industrial production

Method used

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  • Lithium-enriched manganese-based anode material with fast ion conductor coating layer and surface heterostructure and preparation method of lithium-enriched manganese-based anode material
  • Lithium-enriched manganese-based anode material with fast ion conductor coating layer and surface heterostructure and preparation method of lithium-enriched manganese-based anode material
  • Lithium-enriched manganese-based anode material with fast ion conductor coating layer and surface heterostructure and preparation method of lithium-enriched manganese-based anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Put 5g of lithium-rich manganese-based cathode material Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 and 0.7468gNH 4 h 2 PO 4 Mix thoroughly by magnetic stirring;

[0022] 2. Sinter the homogeneously mixed materials in step 1 for 5 hours at an air flow rate of 200ml / min, a heating rate of 1°C / min, and a sintering temperature of 400°C to finally obtain NH 4 h 2 PO 4 Surface-modified lithium-rich manganese-based cathode materials.

[0023] X-ray diffraction (XRD) analysis shows that the product is a lithium-rich manganese-based positive electrode material with high crystallinity and no impurity phase formation. After modification by phosphate, Li 3 PO 4 Phase, Li 4 P 2 o 7 phase and spinel phase (see figure 1 ), these phases exist on the surface of lithium-rich manganese-based cathode material particles, and Li 3 PO 4 Phase, Li 4 P 2 o 7 Both the spinel phase and the spinel phase have a high lithium ion transport coefficient, so the lithium-rich manganese-bas...

Embodiment 2

[0025] 1. Put 5g of lithium-rich manganese-based cathode material Li 1.2 Ni 0.13 co 0.13 mn 0.54 o 2 and 0.1867gNH 4 h 2 PO 4 Mix thoroughly by magnetic stirring;

[0026] 2. Sinter the homogeneously mixed materials in step 1 for 5 hours at an air flow rate of 200ml / min, a heating rate of 1°C / min, and a sintering temperature of 400°C to finally obtain NH 4 h 2 PO 4 Surface-modified lithium-rich manganese-based cathode materials.

[0027] The lithium-rich manganese-based positive electrode material prepared in the experiment has a spherical shape, complete particles, no obvious crushing or agglomeration, and the particle size is about 15-20um (see figure 2 ), the modified lithium-rich manganese-based cathode material better maintains the spherical morphology of the lithium-rich manganese-based cathode material (see image 3 ).

[0028] The first coulombic efficiency of the surface phosphate-modified lithium-rich manganese-based cathode material at a current density...

Embodiment 3

[0031] 1. Put 5g of lithium-rich manganese-based cathode material Li 1.2 Ni 0.13 co 0.13 mn 0.52 Mg 0.02 o 2 and 0.2800g NH 4 h 2 PO 4 Mix thoroughly by magnetic stirring;

[0032] 2. Sinter the homogeneously mixed material in step 1 for 5 hours under the conditions of air flow rate of 300ml / min, heating rate of 5°C / min, and sintering temperature of 500°C to finally obtain NH 4 h 2 PO 4 Surface-modified lithium-rich manganese-based cathode materials.

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Abstract

The invention discloses a lithium-enriched manganese-based anode material with a fast ion conductor coating layer and a surface heterostructure and a preparation method of the lithium-enriched manganese-based anode material. The surface of the lithium-enriched manganese-based anode material is coated with a coating layer consisting of Li3PO4 and Li4P2O7; a spinel phase nano-crystal is inlaid in the surface of the lithium-enriched manganese-based anode material; the spinel phase nano-crystal and a lithium-enriched layered material form a heterostructure; the lithium-enriched manganese-based anode material has a structural formula of Li1+aMnbMcO2, wherein M is one or more of Ni, Co, Al, Cr, Fe and Mg, 0<=a<=1, 0<=b<=1, and 0<=c<=1. The method comprises the following steps: (1) fully mixing the lithium-enriched manganese-based anode material with a proper amount of phosphate; and (2) sintering the sample which is uniformly mixed in a certain atmosphere, thus obtaining the lithium-enriched manganese-based anode material with the fast ion conductor coating layer and the surface heterostructure. The first coulombic efficiency of the lithium-enriched anode material is improved, the cycling stability and rate performance of the lithium-enriched anode material are improved, and the requirements of a power battery can be met.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials and electrochemistry, and relates to a lithium-rich manganese-based cathode material with a fast ion conductor coating layer and a surface heterogeneous structure and a preparation method thereof. Background technique [0002] Compared with traditional lead-acid batteries, nickel-metal hydride batteries and other secondary batteries, lithium-ion batteries have the advantages of high energy density, high output voltage, low self-discharge, no memory effect and environmental friendliness, and have been widely used and developed. The performance of key materials for power and energy storage lithium-ion batteries is the ultimate decisive factor in battery performance, and the research on cathode materials has always been a hot spot for scientists. LiCoO 2 , LiMnO 4 、LiFePO 4 、LiNi x co y mn 1-x-y o 2 Cathode materials have been extensively studied. However, the li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/58
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 杜春雨刘辉尹鸽平程新群左朋建马玉林高云智
Owner HARBIN INST OF TECH
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