A kind of lithium battery and preparation method thereof

A lithium battery and lithium ion technology, which is applied in the manufacture of electrolyte batteries, electrode manufacture, battery electrodes, etc., can solve problems such as difficulties, increase in battery internal resistance, powdering and peeling of positive and negative electrode layers, and simplify the preparation process and process , Reduce the preparation process and process, the effect of small volume changes

Active Publication Date: 2021-12-07
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since each structural layer has different functions, when preparing a battery, it is necessary to stack each structural layer together in different ways, and then press it, etc., the process is complex and difficult
Not only that, because there will be obvious boundaries between the structural layers, which will increase the internal resistance of the battery and affect the battery cycle performance
At the same time, during the charging and discharging process of the battery, the insertion and extraction of lithium ions in the positive and negative electrodes will cause different volume changes in the positive electrode layer and the negative electrode layer, and the mutual stress between the layers is also different. It is prone to powdering and peeling of the positive and negative electrode layers, or even peeling between layers, which seriously affects the cycle performance of lithium-ion batteries

Method used

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  • A kind of lithium battery and preparation method thereof
  • A kind of lithium battery and preparation method thereof

Examples

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preparation example Construction

[0045] On the other hand, the present invention provides the preparation method of above-mentioned lithium battery, it is characterized in that, comprises the following steps:

[0046] (1) Prepare active functional layer slurry mixed with positive electrode active material, negative electrode active material and material conducting lithium ions;

[0047] (2) The active functional layer slurry prepared in step (1) is filled between the positive electrode current collector and the negative electrode current collector to obtain a lithium battery.

[0048]This preparation method avoids the process steps in the prior art that need to separately prepare the positive electrode coating slurry and the negative electrode coating slurry, thereby greatly simplifying the battery preparation process and process, and the lithium battery prepared by this method has the advantages of positive, negative Outside the negative current collector, there is only one layer of structure, and the deinte...

Embodiment 1

[0060] (1) Preparation of a positive electrode active material with a coating layer

[0061] 1000g LiCoO 2 (particle size about 5μm), 20g LiH 2 PO 4 and 1000 mL of solvent water were mixed evenly and kept stirring, and the spray dryer was used to carry out the spray drying operation under the air pressure condition of 25 NL / min and the temperature condition of 220 ℃, and the obtained product powder was taken out and placed in a muffle furnace and heated to 250 ℃, keep for 5h, LiH can be produced 2 PO 4 Coated LiCoO 2 Positive active material. Microscopically, the coating is uniform, and the coating thickness is about 30 nm.

[0062] (2) Preparation of negative electrode active material with coating layer

[0063] Under an inert gas atmosphere, put 1000g of negative electrode active material artificial graphite and 100g of lithium metal powder into a ball mill jar, add 1500mL of toluene as a solvent, and ball mill at a speed of 150 rpm for 20h, take out the obtained prod...

Embodiment 2

[0069] The same steps as in Example 1 were used to prepare the lithium battery of this example, the difference being that:

[0070] The positive active material used is LiH 2 PO 4 The coating mass ratio is 55%:45% NCM811:LiCoO 2 material, the negative electrode active material used is lithium metal-coated carbon-containing shell Li 4 Ti 5 o 12 Material. Step (3) In the preparation of active functional layer coating F, the amount of positive electrode active material is 1000 g, Li 7 La 3 Zr 2 o 12 The amount of solid electrolyte was 150 g, and the amount of negative active material was 1200 g.

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Abstract

The invention provides a lithium battery, including a positive electrode current collector, a negative electrode current collector, and an active functional layer. The active functional layer is obtained by mixing a positive electrode active material, a negative electrode active material, and a material that conducts lithium ions, that is, the lithium battery provided by the present invention For the battery, the positive electrode functional layer, separator layer, and negative electrode functional layer separated in the prior art are fused into one layer, so that the contact between layers is transformed into the contact between material particles, which reduces the transmission path of lithium ions and reduces the battery life. The internal resistance can also avoid powder falling due to the change of battery volume.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used due to their high energy density, high operating voltage, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. Existing lithium-ion batteries, whether traditional lithium-ion batteries using organic electrolytes, inorganic all-solid-state lithium batteries or polymer all-solid-state lithium batteries, generally include a positive electrode layer, a separator layer, and a negative electrode layer. The layer includes a positive electrode current collector and a positive electrode slurry coated on the positive electrode current collector, and the negative electrode layer includes a negative electrode current collector and a negative electrode slurry coated on the negative electrode current collector. The separation l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525H01M10/058H01M4/139H01M4/04
CPCH01M4/0404H01M4/13H01M4/139H01M4/624H01M4/628H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 历彪郭姿珠王国帅
Owner BYD CO LTD
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