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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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing lithium supplement additives generally have low utilization rate, which will produce by-products or gas problems

Method used

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  • 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
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Effect test

Embodiment

[0047] In this example, three lithium sources of lithium hydroxide, lithium carbonate and lithium peroxide were used to prepare lithium supplement additives. The lithium supplement additive is added to the positive electrode material and the negative electrode material respectively, and used as the positive electrode lithium supplement additive and the negative electrode lithium supplement additive respectively. The effects of adding lithium-supplementing additives and not adding lithium-supplementing additives on the first charge and discharge of the battery were tested respectively. details as follows:

[0048] Lithium supplement additive preparation method one:

[0049] (1) Vacuum dry the carbon nanospheres and mix them with anhydrous lithium hydroxide evenly. The quality of the carbon nanospheres and lithium hydroxide is 30g and 70g respectively to make a mixture; the mixing method can be grinding, ball milling or Dry stirring method, this example specifically adopts bal...

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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.

Description

technical field [0001] The present application relates to the field of lithium ion battery materials, in particular to a lithium supplement additive and its preparation method and application. Background technique [0002] With the improvement of market demand, the energy density of lithium-ion batteries urgently needs to be increased, and the search for positive and negative electrode materials with larger capacity has become one of the research hotspots in the field of batteries today. High-capacity electrode materials are often accompanied by a low first effect. During the first discharge process, a large amount of lithium ions are consumed to form irreversible content products, resulting in a battery whose reversible capacity is much lower than the theoretical value. For example, silicon, silicon-oxygen, and silicon-carbon materials are a very typical class of new negative electrode active materials with high theoretical specific capacities. However, due to the low firs...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 高红宋华杰李维曹志颖张青勇
Owner SHENZHEN BAK POWER BATTERY CO LTD
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