Preparation method of high performance oxide coated nano-SnO2 negative electrode material

A negative electrode material, oxide technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of low expansion mechanical properties of tin-based materials, affecting the insertion and extraction of lithium ions, and affecting the tin-based materials. Material specific capacity and other issues, to achieve the effect of simple preparation method, inhibition of expansion, and good charge-discharge cycle performance

Inactive Publication Date: 2018-11-06
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art, the liquid-phase method is generally used to coat tin-based materials with oxides, but the thickness of the coating layer produced by the liquid-phase method is relatively thick, which affects the intercalation and extraction of lithium ions, resulting in the actual use ratio of tin-based materials. capacity drop
At present, there are also reports of oxide coating and modification of tin-based materials by gas-phase atomic layer deposition (ALD). If it is too thick, the coating layer will be denser, which will affect the actual specific capacity of the tin-based material; if the thickness of the coating layer is too thin, the mechanical properties of inhibiting the expansion of the tin-based material will be low, and it will not be able to control the tin-based material during charging and discharging. Problems with base material expansion

Method used

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  • Preparation method of high performance oxide coated nano-SnO2 negative electrode material
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  • Preparation method of high performance oxide coated nano-SnO2 negative electrode material

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Effect test

Embodiment 1

[0034] A high-performance oxide-coated nano-SnO 2 The preparation method of negative electrode material, comprises the following steps:

[0035] S1 spherical nano SnO 2 Put the particles in a vacuum oven and bake at 80°C for 12 hours, take them out and put them in a brown reagent bottle to seal for later use;

[0036] S2, using the atomic layer deposition method, the dry spherical nano-SnO 2 The particles are put into the atomic layer deposition chamber, the chamber temperature is heated to 120°C, and ethylene glycol is used as the pulse precursor for passivation. The passivation time is 65s, and then purged with carrier gas;

[0037] S3. Using the atomic layer deposition method, the spherical nano-SnO loaded with passivation 2 The atomic layer deposition chamber of the particles was heated to 250 °C, using titanium pentaethoxide as the precursor A, and deionized water as the precursor B, the passivated spherical nano-SnO 2 The particles are subjected to cyclic deposition ...

Embodiment 2

[0040] A high-performance oxide-coated nano-SnO 2 The preparation method of negative electrode material, comprises the steps:

[0041] S1. Spherical nano SnO 2 Put the particles into a vacuum oven and bake at 100°C for 10 hours, take them out and put them into a brown reagent bottle to seal for later use;

[0042] S2, using the atomic layer deposition method, the dry spherical nano-SnO 2 The particles are put into the atomic layer deposition chamber, the temperature of the chamber is heated to 150°C, and ethylene glycol is used as the pulse precursor for passivation. The passivation time is 35s, and then purged with carrier gas;

[0043] S3. Using the atomic layer deposition method, the spherical nano-SnO loaded with passivation 2The atomic layer deposition chamber of the particles was heated to 350 °C, using titanium pentaethoxide as the precursor A and deionized water as the precursor B, the passivated spherical nano-SnO 2 The particles are subjected to cyclic deposition...

Embodiment 3

[0045] A high-performance oxide-coated nano-SnO 2 The preparation method of negative electrode material, comprises the steps:

[0046] S1. Spherical nano SnO 2 Put the particles into a vacuum oven and dry at 90°C for 11 hours, take them out and put them into a brown reagent bottle to seal for later use;

[0047] S2, dry spherical nano-SnO 2 The particles are put into the atomic layer deposition chamber, the temperature of the chamber is heated to 140°C, and ethylene glycol is used as the pulse precursor for passivation. The passivation time is 40s, and then purged with carrier gas;

[0048] S3. Using the atomic layer deposition method, the spherical nano-SnO loaded with passivation 2 The atomic layer deposition chamber of the particles was heated to 270 °C, using titanium pentaethoxide as the precursor A and deionized water as the precursor B, the passivated spherical nano-SnO 2 The particles are subjected to cyclic deposition and plating, and the cycle is stopped for 55 t...

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Abstract

The invention discloses a preparation method of a high performance oxide-coated nano-SnO2 negative electrode material, and the preparation method comprises the following steps: firstly, surface-passivation treatment is performed on nano-SnO2 particles, and then the surface of the nano-SnO2 particles is coated with an oxide. The negative electrode material prepared by the method has a large specific capacity, the volume expansion effect of the negative electrode material during charging and discharging of a lithium ion battery can be inhibited, and the high performance oxide-coated nano-SnO2 negative electrode material has good charge and discharge cycle performance, and has simple preparation method and good repeatability.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-performance oxide-coated nano-SnO 2 Preparation method of negative electrode material. Background technique [0002] Lithium-ion batteries will become the main power source for electric vehicles due to their performance advantages such as high specific energy and long-lasting stability. Chemical energy storage technologies represented by lithium-ion batteries are also being actively invested in research and development. The current commercial lithium-ion battery anode material is graphite carbon material, but its theoretical capacity is only 372mAh / g; on the other hand, the lithium intercalation potential of this material is mainly concentrated at 0-0.1V (vs.Li / Li+) In the range, it is very close to the deposition potential of metal lithium, which is not conducive to the safety of the battery. In order to meet the needs of high-capacity lithium-ion batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M10/0525Y02E60/10
Inventor 万宁杨茂萍汪伟伟陈峰
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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