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Negative-pole active material and preparation method thereof as well as lithium ion battery using negative-pole active material

A negative electrode active material and carbon material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing the cycle performance and charge-discharge efficiency of lithium-ion batteries, shortening the service life of batteries, collapse, pulverization, etc., to achieve Improve cycle performance and charge and discharge efficiency, avoid liquid absorption expansion, and improve service life

Active Publication Date: 2015-07-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the composite material of the prior art is easily alloyed with lithium metal as the negative electrode, causing the composite material to absorb liquid and expand, even collapse and pulverize, resulting in the consumption of the negative electrode active material; and the solvent in the electrolyte It is easy to be reduced and decomposed near the negative electrode, thereby reducing the cycle performance and charge-discharge efficiency of the lithium-ion battery, and shortening the service life of the battery; and then proposes a negative electrode active material that has a large specific capacity, is not easy to expand, and is not easy to cause the electrolyte to decompose

Method used

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  • Negative-pole active material and preparation method thereof as well as lithium ion battery using negative-pole active material
  • Negative-pole active material and preparation method thereof as well as lithium ion battery using negative-pole active material

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Mix 2.5g of lithium carbonate, 0.8g of alumina, 7.1g of titanium oxide, 18g of ammonium dihydrogen phosphate, 2000g of deionized water and 100g of silicon powder with a particle size of 2μm and seal it, and react at a constant temperature of 100°C for 24h , to obtain the precursor suspension;

[0045] (2) After filtering, washing and drying the above-mentioned precursor suspension, calcining at 600°C for 12 hours in a nitrogen atmosphere to obtain the coating material;

[0046] (3) Add 900g of graphite with a particle size of 2μm and 120g of coating material to 2100g of a mixture composed of ethanol and thiophene (20:1 by weight) and mix evenly to form a stable solid-liquid mixture, then vacuum-dry at 50°C , and then calcined at 300° C. for 12 h in a nitrogen atmosphere to obtain negative electrode active material A.

[0047] In this embodiment, the coating material is composed of the second material coated on silicon, take a small amount of the second material on ...

Embodiment 2

[0051] (1) Mix 2.6g of lithium nitrate, 1.24g of lithium hydroxide, 4.1g of lanthanum oxide, 6.2g of germanium oxide, 14.6g of lithium phosphate, 2000g of deionized water, and 80g of tin powder with a particle size of 3μm and seal them up at 120 Constant temperature reaction at ℃ for 20 hours to obtain precursor suspension;

[0052] (2) After filtering, washing and drying the above-mentioned precursor suspension, calcining at 800°C for 10 hours in an argon atmosphere to obtain the coating material;

[0053] (3) Add 1100g of hard carbon with a particle size of 5 μm and 100g of coating material to a 1800g mixture of acetone, tetrahydrofuran and polypyrrole (8.5:8.5:1 by weight) and mix evenly to form a stable solid-liquid mixture. Vacuum-dried at 60° C., and then calcined at 400° C. for 10 h in an argon atmosphere to obtain negative electrode active material B.

[0054] In this embodiment, the coating material is composed of the second material coated on tin. A small amount of ...

Embodiment 3

[0058] (1) Mix 7.9g of lithium chloride, 3.3g of chromium oxide, 16.1g of zirconia, 18.5g of phosphorus pentoxide, 2200g of deionized water and 120g of germanium powder with a particle size of 5μm and seal it, and keep the temperature at 150°C React for 18 hours to obtain the precursor suspension;

[0059] (2) After filtering, washing and drying the above-mentioned precursor suspension, roast it in a helium atmosphere at 1000°C for 4 hours to obtain the coating material;

[0060] (3) Add 900g of soft carbon with a particle size of 10μm and 160g of coating material to a 1950g mixture of tetrahydrofuran and polytetrafluoroethylene (12:1 by weight) and mix evenly to form a stable solid-liquid mixture. °C in vacuum, and then calcined at 500 °C for 8 h in a nitrogen atmosphere to obtain negative electrode active material C.

[0061] In this embodiment, the coating material is composed of the second material coated on germanium, and a small amount of the second material on the surf...

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Abstract

The invention discloses a negative-pole active material. The negative-pole active material comprises a core material and a cladding material formed outside the core material, wherein the cladding material is constituted by a first material and a second material cladding outside the first material, and the first material can form an alloy with lithium; ionic conductance of the second material is 10<-5>-10<-4>S / cm, electronic conductivity is lower than 10<-10>S / cm. In addition, the invention discloses a preparation method of the negative-pole active material and a lithium ion battery using the negative-pole active material. The negative-pole active material has the advantages that the cycle performance and charge-discharge efficiency of a lithium ion battery is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to a negative electrode active material, a preparation method of the negative electrode active material, and a lithium ion battery using the negative electrode active material, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion battery is a new green chemical energy source. Compared with traditional nickel-cadmium batteries and nickel-metal hydride batteries, it has the advantages of high voltage, long life and high energy density. At present, the negative electrode active materials in lithium-ion batteries are generally carbon materials, such as graphite, hard carbon, soft carbon, petroleum coke and carbon microspheres, etc., but the theoretical specific capacity of carbon materials is only 372mAh / g, making the carbon negative electrode lithium ion The capacity of the battery is very low, and it is difficult to meet the demand for high-capacity lithium-ion batteries in actual use....

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/366H01M4/58H01M4/583H01M10/0525Y02E60/10
Inventor 易观贵马永军郭姿珠
Owner BYD CO LTD
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