Carbon-coated negative electrode material, preparation method thereof and battery

A negative electrode material, carbon coating technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electronic conductivity and high rate performance, limit wide application, etc., to improve the intrinsic electronic conductivity, The effect of improving Li+ diffusion coefficient and improving rate performance

Active Publication Date: 2019-08-16
余姚市海泰贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it also has certain disadvantages. On the one hand, Li 2 MnTi 3 o 8 The theoretical capacity of 240mAh / g is higher than that of lithium titanate, but compared with graphite, the theoretical capacity still needs to be improved, so as to meet the demand of high energy density batteries for negative electrode materials. On the other hand, its electronic conductivity and high rate The performance is also not good, which limits its commercial wide application

Method used

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  • Carbon-coated negative electrode material, preparation method thereof and battery
  • Carbon-coated negative electrode material, preparation method thereof and battery
  • Carbon-coated negative electrode material, preparation method thereof and battery

Examples

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preparation example Construction

[0022] In the preparation method of the present invention, titanium dioxide, phosphoric acid, lithium source, metal element-containing salt, carbon source and water are subjected to step-by-step ultrasonic stirring to obtain a nano-scale homogeneous solution, and then the solid-liquid is separated and dried, and the ground powder is ground at a certain N 2 Under the condition of partial pressure, heat treatment is carried out to obtain the nano-titanium-based negative electrode material coated with nitrogen and phosphorus co-doped carbon. The preparation method does not need to adjust the acidity and alkalinity, nor does it need to adjust the temperature in the stirring process, thereby achieving the purpose of cost reduction and efficiency increase. The preparation method of the present invention is simple and feasible, and the intrinsic electronic conductivity and Li + The diffusion coefficient solves the problem of inherently low intrinsic conductivity of titanium-based ano...

Embodiment 1

[0031] 2.377g of anatase TiO 2 Mix the powder, 1g of sucrose and 0.3g of phosphoric acid, then add 60ml of deionized water and use an ultrasonic cleaner for 2 hours to disperse evenly, and then stir for 6 hours to obtain a uniformly mixed suspension A.

[0032] The lithium carbonate of 0.738g and the MgC of 2.1445g 2 o 4 2H 2 O was slowly added into the suspension A, first ultrasonically dispersed for 2 hours, and then stirred for 6 hours to obtain the suspension B.

[0033] The suspension B was suction-filtered to obtain a solid precursor, and then dried at 60°C for 8 hours, and then ground into a uniform powder.

[0034] The ground powder was heated at a rate of 2 °C / min to 700 °C for 1 hour, and then heated under N 2 The partial pressure is 80% of the total gas pressure (the other gas is Ar) and the temperature is raised to 800 ° C for 3 hours, and then cooled to 25 ° C to obtain a black nitrogen-phosphorus co-doped carbon-coated titanium-based lithium battery negative ...

Embodiment 2

[0045] The preparation method of this example is basically the same as that of Example 1, the only difference is that the quality of each component is different, anatase TiO 2 Powder is 2.1g, sucrose is 0.5g, phosphoric acid is 0.15g, lithium carbonate is 0.53g, MgC 2 o 4 2H 2 O is 1.5 g. The prepared negative electrode material has a reversible capacity of 253mAh / g in the first cycle at a current density of 0.1A / g, and a discharge specific capacity of 200mAh / g after 10 cycles. Under the current density, the discharge specific capacity can reach 170mAh / g, 150mAh / g and 70mAh / g.

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Abstract

The present invention relates to a carbon-coated negative electrode material, a preparation method thereof and a battery. The preparation method comprising the steps of mixing titanium dioxide, a carbon source, phosphoric acid, salt containing metal elements, a lithium source and water to obtain a suspension, performing solid-liquid separation on the suspension and collecting a solid to obtain a precursor, drying, grinding and heating to 300 DEG C to 3300 DEG C for 1 to 33 hours, heating 700 DEG C to 3700 DEG C for 3 hours and 36 hours under a nitrogen atmosphere to obtain the carbon-coated negative electrode material. The idea of the preparation method, the preparation method is feasible, the intrinsic low electron conductivity and the Li+ diffusion coefficient of the material can be improved by doping nitrogen and phosphorus atoms, the problem of inherent low intrinsic conductivity of a titanium-based negative electrode material is solved, the material can be used with carbon, and the rate performance and cycle performance of the material at a high current are improved.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a carbon-coated negative electrode material, a preparation method thereof, and a battery. Background technique [0002] The successive application of lithium-ion secondary batteries from portable devices to electric vehicles has brought great convenience and rich material life to human beings, but also put forward higher requirements for its safety and energy density. The carbonaceous materials used in the current battery have a working voltage of only 0.1V. On the one hand, it is easy to cause the electrolyte to be reduced, thereby forming a thicker SEI film on the surface of the negative electrode, thereby limiting the Li + On the other hand, as the discharge rate increases, lithium dendrites are easy to form, which brings serious safety problems. [0003] Cubic spinel Li 2 MTi 3 o 8 (wherein M is selected from Mg, Co, Ni, Mn), with its P4 3 The typical structure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/362H01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 秦蒙李东剑王星星李小兵
Owner 余姚市海泰贸易有限公司
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