Lithium-supplementing additive as well as preparation method and application thereof

An additive and lithium-replenishing technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low utilization rate, by-products or gas generation, etc., to improve utilization rate, improve electrical conductivity, and improve battery capacity Effect

Pending Publication Date: 2018-03-20
SHENZHEN BAK POWER BATTERY CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

The existing lithium supplement additives generally have low u...
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Method used

On the basis of above test, this example has also adopted the supplementary lithium additive prepared by method two and method three respectively as positive electrode supplementary lithium additive, negative pole supplementary lithium additive respectively, and the results show that method two and method three preparations The effect of the lithium supplement additive is the same as that of the lithium supplement additive prepared by method 1, both of which can improve the first effect, increase the charge and discharge capacity, and have a good lithium supplement effect.
[0043] Based on the above research and discovery, the present application proposes that lithium oxide is deposited on the surface of a conduct...
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Abstract

The invention discloses a lithium-supplementing additive as well as a preparation method and application thereof. The lithium-supplementing additive is of a core-shell structure, a core material is aconductive carbon material, a shell material is lithium oxide, lithium oxide is deposited on the surface of the conductive carbon material, and nano-scale lithium oxide particles form a nano-layer shell. According to the lithium-supplementing additive, lithium oxide is composited with the conductive carbon material and is utilized for supplementing lithium, and the conductive carbon material is utilized for conducting electrons, so that the utilization rate of lithium oxide is increased, and lithium can be well supplemented to an positive electrode or a negative electrode. Furthermore, after lithium is removed from the lithium-supplementing additive, the conductive carbon material can be used as an electrode conducting material, and no impurity is introduced. The lithium-supplementing additive is safe, environmentally friendly and non-toxic, and a foundation is laid for the preparation of high-capacity lithium ion batteries.

Application Domain

Cell electrodesSecondary cells

Technology Topic

NanometreElectrically conductive +10

Image

  • Lithium-supplementing additive as well as preparation method and application thereof
  • Lithium-supplementing additive as well as preparation method and application thereof
  • Lithium-supplementing additive as well as preparation method and application thereof

Examples

  • Experimental program(1)
  • Effect test(1)

Example Embodiment

[0046] Example
[0047] In this example, three lithium sources, namely lithium hydroxide, lithium carbonate and lithium peroxide, were used to prepare lithium supplementary additives. The lithium supplementary additive is respectively added to the positive electrode material and the negative electrode material, and used as the positive electrode lithium supplementary additive and the negative electrode lithium supplementary additive respectively. The effects of adding and not adding lithium supplementary additives on the first charge and discharge of the battery were tested respectively. details as follows:
[0048] Preparation method one of lithium supplement additive:
[0049] (1) Mix the carbon nanospheres with anhydrous lithium hydroxide after vacuum drying, and the masses of the carbon nanospheres and lithium hydroxide are 30g and 70g, respectively, to make a mixture; the mixing method can be a grinding method, a ball milling method or a Dry mixing method, in this example, ball milling is used for mixing.
[0050] (2) After wrapping the mixture with silver foil, put it in a nickel pan, transfer it to a tube furnace, pass in a gas without carbon dioxide for protection, seal it and heat it to 600-700 ° C under reduced pressure, and The temperature is controlled at a certain fixed value, and the reaction time is sufficient, usually the reaction time is more than 30min; in this example, the pressure is reduced to -100KPa, and the reaction is carried out at 650°C for 1h.
[0051] (3) After the decompression heating is completed, the decompression is stopped, and it is cooled naturally. When the temperature is about to reach 30-50°C, dry air without carbon dioxide is slowly introduced to break the air.
[0052] (4) After the hollow is broken, the nickel disk is quickly transferred to a drying oven for drying to obtain a lithium-supplementing additive compounded by lithium oxide and conductive carbon material.
[0053] Preparation method 2 of lithium supplement additive:
[0054] (1) the carbon nanospheres are vacuum-dried and mixed with lithium carbonate. The quality of carbon nanospheres and lithium carbonate are respectively 30g and 70g. The mixing method is grinding method, ball milling method or dry stirring method. In this example, the grinding method is specifically adopted. .
[0055] (2) Put the mixture in a platinum pan in a porcelain tube, reduce the pressure to -100kPa, and keep the pressure constant. By means of intermittent vacuuming, the variation range of the vacuum degree is kept not more than 1kPa, and at the same time, it is heated to 700 ℃ to make it decompose, and the temperature is kept for 50 hours until no gas is generated. Among them, the criterion for determining that there is no other occurrence is that the degree of vacuum does not change without vacuuming.
[0056] (3) After the decompression heating is completed, the decompression is stopped, and it is cooled naturally. When the temperature is about to reach room temperature, that is, when the temperature is 30-50 °C, dry air without carbon dioxide is slowly introduced to break the air.
[0057] (4) After the void is broken, the platinum disk is quickly transferred to a drying oven for drying to obtain a lithium-supplementing additive compounded by lithium oxide and a conductive carbon material.
[0058] Preparation method three of lithium supplementation additive:
[0059] (1) the carbon nanospheres are vacuum-dried and mixed with lithium peroxide, the quality of carbon nanospheres and lithium peroxide are respectively 45g and 55g, and the mixing method is grinding method, ball milling method or dry stirring method. grinding method.
[0060] (2) Put the mixture in a platinum pan in a porcelain tube, reduce the pressure to -100kPa, and keep the pressure constant. By means of intermittent vacuuming, the variation range of the vacuum degree is kept not more than 1kPa, and at the same time, it is heated to 700 ℃ to make it decompose, and the temperature is kept for 50 hours until no gas is generated.
[0061] (3) After the decompression heating is completed, the decompression is stopped, and it is cooled naturally. When the temperature is about to reach room temperature, that is, when the temperature is 30-50 °C, dry air without carbon dioxide is slowly introduced to break the air.
[0062] (4) After the void is broken, the platinum disk is quickly transferred to a drying oven for drying to obtain a lithium-supplementing additive compounded by lithium oxide and a conductive carbon material.
[0063] The lithium-replenishing additive obtained by the first three methods was observed by transmission electron microscope (abbreviation TEM), and it can be clearly seen that the lithium-replenishing additive compounded by lithium oxide and conductive carbon material has a core-shell structure, that is, the outer surface of the carbon nanospheres is wrapped A lithium oxide nanolayer shell; partial results such as Figure 4 shown, Figure 4 The lithium oxide and conductive carbon material composite lithium supplement additive prepared by the first method.
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Description & Claims & Application Information

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