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A lithium-rich manganese-based cathode material with a fast ion conductor cladding layer and a surface heterogeneous structure and its preparation method

A positive electrode material, lithium-rich manganese-based technology, applied in the field of lithium-rich manganese-based positive electrode materials and its preparation, 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: 2016-06-22
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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  • A lithium-rich manganese-based cathode material with a fast ion conductor cladding layer and a surface heterogeneous structure and its preparation method
  • A lithium-rich manganese-based cathode material with a fast ion conductor cladding layer and a surface heterogeneous structure and its preparation method
  • A lithium-rich manganese-based cathode material with a fast ion conductor cladding layer and a surface heterogeneous structure and its preparation method

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Experimental program
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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 uniformly mixed material in step 1 at an air flow rate of 200ml / min, a heating rate of 1°C / min, and a sintering temperature of 400°C for 5 hours to obtain NH 4 H 2 PO 4 Surface modified lithium-rich manganese-based cathode material.

[0023] X-ray diffraction (XRD) analysis shows that the product is a lithium-rich manganese-based cathode material with high crystallinity and no impurity phase formation. After phosphate modification, Li appears 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 high lithium ion transport coefficients, so the lithium-rich manganese-based cathode material is mixed and sintered with p...

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 uniformly mixed material in step 1 at an air flow rate of 200ml / min, a heating rate of 1°C / min, and a sintering temperature of 400°C for 5 hours to obtain NH 4 H 2 PO 4 Surface modified lithium-rich manganese-based cathode material.

[0027] The lithium-rich manganese-based cathode material prepared in the experiment has a spherical morphology, complete particles, no obvious fragmentation 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 of 30mA / g is 87.0% (see Figure 4 ...

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 0.2800gNH 4 H 2 PO 4 Mix thoroughly by magnetic stirring;

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

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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-hydrogen 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 for battery performance. 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 And other cathode materials have been extensively studied. However, the lithium-io...

Claims

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Application Information

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Patent Type & Authority Patents(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