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Method for preparing high capacity lithium ion cells cathode material

A lithium-ion battery and negative electrode material technology, which is applied to the electrodes of primary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of electrode electrochemical behavior, difficult to control the preparation process, and large powder particle size, etc., to achieve good cycle stability The effect of safety, low cost and fast synthesis speed

Inactive Publication Date: 2007-12-12
PEKING UNIV
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Problems solved by technology

Although this method can prepare SnSb alloy powder with small particles, there are often residual boron elements, chloride ions or hydroxide ions on the surface of the SnSb alloy powder, which are difficult to remove and will have a certain impact on the electrochemical behavior of the electrode. impact, the preparation process is difficult to control, and the synthesis cost is high
The preparation method of the solid phase reaction method is simple and low in cost, but the obtained powder has a large particle size and the cycle performance is not ideal

Method used

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  • Method for preparing high capacity lithium ion cells cathode material
  • Method for preparing high capacity lithium ion cells cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: Synthesis of quasi-nanoscale SnSb alloy particles

[0028] (1) The hydrogen arc plasma preparation device used is as shown in Figure 1. The water-cooled copper plate is used as the anode, and the tungsten electrode is the cathode. Pure tin (purity > 99.9%) 70% and pure antimony (purity > 99.9%) 30% in molar ratio % ratio of ingredients, in argon atmosphere with arc heating and melting to obtain alloy ingots, in order to mix the ingredients evenly, the alloy ingots should be turned up and down 4 times;

[0029] (2) When carrying out the fourth smelting, take out part of the argon gas, feed into hydrogen gas accounting for 20% of the total volume, a large amount of metal evaporates to generate ultrafine powder particles, keep the total pressure of the atmosphere at 0.1Mpa during the preparation process, and the current is 200A, The voltage is 25V, and the circulating air flow for collecting particles is 100L / min;

[0030] (3) Passivate the obtained nanopart...

Embodiment 2

[0033] Embodiment 2: Synthesis of nanoscale SiNi alloy particles

[0034] (1) Used hydrogen arc plasma preparation device as shown in Figure 1, water-cooled copper plate is as anode, tungsten electrode is negative electrode, by molar ratio pure silicon molar ratio pure silicon (purity>99.9%) 80%, pure nickel (purity>99.9%) 99.9%) and 20% of the ingredients, in an argon atmosphere with arc heating and smelting to obtain alloy ingots, in order to mix the ingredients evenly, the alloy ingots should be turned up and down 4 times;

[0035] (2) When carrying out the fourth smelting, part of the argon gas is extracted, and hydrogen gas accounting for 50% of the total volume is introduced, and a large amount of metal evaporates to generate ultrafine powder particles. During the preparation process, the total pressure of the atmosphere is kept at 0.1Mpa, and the current is 200A. The voltage is 25V, and the circulating air flow for collecting particles is 100L / min;

[0036] (3) Passiva...

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Abstract

The invention discloses a submicron powder alloy particles and its utilization, and is is in order to provide a cathode material for lithium battery. It comprises following steps: arc heating and melting metals with inert gas such as argon to get alloy, then under condition of with the mixture gas of hydrogen and inert gas, evaporating alloy to submicron powder by controlling arc current, arc pressure and total pressure, inactivating and getting material that can be used as cathode materials for lithium battery. The invention is characterized in that the reversible stored kalium of prepared submicron powder is 2-3 times as much as that of general carbon material generally used in current days, and the circularity is good.

Description

technical field [0001] The invention relates to a preparation method of a high-capacity lithium-ion battery negative electrode material, belonging to the technical field of lithium-ion batteries. Background technique [0002] As a new green secondary battery with high voltage, high energy density, light weight, wide operating temperature, long cycle life and good safety performance, lithium ion battery has been widely used in various electronic products, such as notebook computers, Portable devices such as mobile phones, electric vehicles, electrical energy storage devices, space satellites, miniature electronic devices, etc. [0003] At present, the anode materials used in lithium-ion batteries are mainly various carbon materials such as petroleum coke, carbon fiber, pyrolytic carbon, natural graphite, and artificial graphite. The main advantages are their high charge and discharge efficiency and good cycle life. However, the theoretical specific capacity of carbon materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02B22F9/14B22F1/00H01M4/06H01M4/04H01M4/1395
CPCY02E60/10Y02P70/50
Inventor 李星国王忠田文怀
Owner PEKING UNIV
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