High-capacity negative electrode material as well as preparation method and application thereof

A negative electrode material, high-capacity technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of material performance degradation, destruction of conductive network, complicated processes, etc., to improve cycle performance, improve cycle performance, process Simple and easy to enlarge effect

Inactive Publication Date: 2019-02-22
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes are costly and complicated, and may even destroy the conductive network in the high-capacity Si / C composite structure, resulting in a decrease in material performance.

Method used

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  • High-capacity negative electrode material as well as preparation method and application thereof
  • High-capacity negative electrode material as well as preparation method and application thereof
  • High-capacity negative electrode material as well as preparation method and application thereof

Examples

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preparation example Construction

[0028] The preparation method of the high-capacity negative electrode material of the present invention, the high-capacity negative electrode material is (M / C 1 )@C 2 , based on M / C 1 The composite material is the precursor, and the carbon material C is coated with a multi-step "liquid phase impregnation-heat treatment" method 2 Prepared, where M is Si, Sn or A x o y , A is any one or more of Si, Sn, Mn, Fe, Co, Ni, Cu or Zn, 01 M in composite materials, C in carbon materials 1 It has a good dispersion structure, the particle size of the primary structure is 3-40 μm, and the primary structure can be in any shape, preferably spherical.

[0029] Concrete preparation method comprises the following steps:

[0030] (1) Change the M / C 1 The composite material and carbon source 1 are dispersed in solvent 1, stirred at 50-90°C, 200-600 rpm, evaporated to dryness, and heat-treated to obtain (M / C 1 )@C 2 1 Material;

[0031] (2) Will (M / C 1 )@C 2 1 Materials and carbon sour...

Embodiment 1

[0039] (1) Take 10g coal tar pitch, 100g self-made Si / C 1 (Si and carbon material C 1 The mass fractions are 65% and 35% respectively) and the material is dispersed in 440g of ethanol, continuously stirred in a water bath at 75°C, the stirring speed is 500rpm, the solution is evaporated to dryness and then heat-treated, the heat-treatment condition is a nitrogen atmosphere, and 550°C is processed for 4h to obtain ( Si / C 1 )@C 2 1 Material;

[0040] (2) Take 12.00g petroleum pitch, 105g (Si / C 1 )@C 2 1 The material was dispersed in 250g of ethanol, stirred continuously at 80°C, the stirring speed was 350rpm, the solution was evaporated to dryness and then heat-treated, the heat-treatment condition was nitrogen atmosphere, 600°C for 2h, and (Si / C 1 )@C 2 (C 2 =C 2 1 +C 2 2 ) silicon carbon material.

[0041] (Si / C of this embodiment 1 1 )@C 2 Scanning electron micrographs of silicon carbon materials such as figure 1 as shown, figure 1 The scanning electron micr...

Embodiment 2

[0045] (1) Take 15g of petroleum pitch, 100g of homemade γ-Fe 2 o 3 / C 1 Material (Fe 2 o 3 and C 1 The mass fractions are 80% and 20%, respectively, C 1 carbon nanotubes) were dispersed in 500g of ethanol, stirred continuously in a water bath at 55°C, the stirring speed was 600rpm, the solution was evaporated to dryness, and then heat-treated, the heat-treatment condition was a nitrogen atmosphere, and treated at 300°C for 4h to obtain (Fe 2 o 3 / C 1 )@C 2 1 Material;

[0046] (2) Take 6.00g sucrose, 100g (Fe 2 o 3 / C 1 )@C 2 1 The material was dispersed in 400 g of deionized water, stirred and evaporated to dryness at 80 °C, and heat-treated at 300 °C for 4 h in a nitrogen atmosphere to obtain (Fe 2 o 3 / C 1 )@(C 2 1 +C 2 2 )Material;

[0047] (3) Take 4.00g cyclodextrin, 100g (Fe 2 o 3 / C 1 )@(C 2 1 +C 2 2 ) materials were dispersed in 200g of ethylene glycol, evaporated to dryness with stirring at 75°C, and heat-treated at 750°C for 2h in a nit...

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Abstract

The invention provides a high-capacity negative electrode material as well as a preparation method and application thereof. The high-capacity negative electrode material is prepared by the following steps: by taking an M / C1 composite material as a precursor, coating a carbon material C2 in a manner of repeatedly performing liquid-phase dipping-heat treatment, thereby obtaining the product, whereinM is Si, Sn or AxOy; A is any one or more of Si, Sn, Mn, Fe, Co, Ni, Cu or Zn; and x / y is more than 0 and less than 2. The prepared high-capacity negative electrode material has the specific capacityof 600-1800mAh / g, and can be applied to lithium ion batteries or super-capacitors. According to the multi-step 'liquid-phase dipping-heat treatment' process, by virtue of 'multi-step' and 'liquid phase' operating manners, the complete carbon coating layer can be prepared on the premise of ensuring that a conductive network inside the high-capacity M / C1 material is invariable, and the cycle performance of the material is further improved.

Description

technical field [0001] The invention belongs to the field of energy storage and relates to a lithium ion battery, more specifically a high-capacity negative electrode material and its preparation method and application. Background technique [0002] In recent years, the new energy automobile industry has developed rapidly, and various electronic 3C products have emerged in an endless stream; people's demand for these products to be lightweight and long-lasting is also increasing. As a secondary battery with long cycle life and high energy density, lithium-ion batteries have ushered in new opportunities, but also face great challenges. At present, short cycle life has become an important shackle that inhibits the development of high energy density lithium-ion batteries. [0003] Silicon-based materials, tin-based materials and transition metal oxides M x o y (M is Mn, Fe, Co, Ni, Cu and Zn, etc.) has attracted widespread attention in the industry for its ultra-high specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/52H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/387H01M4/48H01M4/52H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 杨时峰曹国林刘万曹新龙田占元邓增社
Owner SHAANXI COAL & CHEM TECH INST
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