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Lithium supplementing additive for lithium ion battery, battery electrode and preparation method and application thereof

A lithium-ion battery and additive technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low efficiency, hidden safety hazards, and complicated operation processes

Pending Publication Date: 2020-04-17
TIANJIN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: the efficiency of the current lithium-ion battery replenishment method is low, the operation process is complicated, and there are certain potential safety hazards

Method used

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  • Lithium supplementing additive for lithium ion battery, battery electrode and preparation method and application thereof
  • Lithium supplementing additive for lithium ion battery, battery electrode and preparation method and application thereof
  • Lithium supplementing additive for lithium ion battery, battery electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0065] The preparation method of the lithium supplement additive includes: a high-temperature solid-phase method, a liquid-phase method, a vapor-phase method, and the like.

[0066] The lithium sources used in the preparation method include but are not limited to lithium hydroxide, lithium carbonate, lithium nitrate, lithium chloride, lithium sulfide, lithium fluoride, lithium oxide, metallic lithium, organic lithium sources (including but not limited to butyl lithium, phenyllithium, ethyllithium).

[0067] A lithium ion battery, containing the above-mentioned lithium supplement additive, positive electrode material and negative electrode material, its positive electrode material is lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel manganate, lithium nickel cobalt manganate, nickel cobalt Lithium aluminate, lithium-rich lithium manganate, lithium iron phosphate, lithium vanadium phosphate, lithium manganese phosphate, lithium cobalt phosphate, or a combin...

Embodiment 1

[0076] Example 1 Lithium supplement additive, positive electrode material and application in lithium ion battery

[0077] Get 0.3g lithium sheet in iron crucible, 0.46g red phosphorus (analytical pure) is tiled on the surface of lithium sheet (such as figure 1 shown), placed on a heating table, heated at 300°C for 1 h in an Ar atmosphere in a glove box, cooled naturally and fully ground, then heated at 300°C for 0.5 h in an Ar atmosphere in a glove box, and then heated to 450°C 1h (obtained product such as figure 2 shown), get Li 3 P additive.

[0078] Preparation of positive electrode slurry: this embodiment obtains Li 3 P additive and positive electrode active material lithium iron phosphate (LFP), conductive carbon black (SP), binder polyvinylidene fluoride (PVDF) according to the required weight ratio of 5:70:15:10, a total of 2.0g was added to 6.6mlN - In methylpyrrolidone (NMP), after fully mixing, a positive electrode slurry is obtained.

[0079]Preparation of neg...

Embodiment 2

[0086] Example 2 Lithium-supplementing additives, positive electrode materials and their application in lithium-ion batteries

[0087] Take 0.3g of lithium flakes in an iron crucible, spread 1.35g of red phosphorus (analytical pure) on the surface of the lithium flakes, place on a heating platform, heat at 200°C for 5h in an Ar atmosphere in a glove box, cool naturally and grind fully, In a glove box, heat at 200° C. for 5 hours under an Ar atmosphere, and then raise the temperature to 400° C. and heat for 5 hours to obtain the LiP additive.

[0088] Using the LiP prepared in this example as the lithium supplement additive, refer to the steps in Example 1, select lithium cobaltate as the positive electrode active material to prepare the positive electrode slurry, refer to the assembly process of Example 1 to assemble the battery, and the electrochemical performance test results are shown in the table 3, wherein the discharge capacity of this embodiment is similar to that of em...

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Abstract

The invention relates to a lithium supplementing additive for a lithium ion battery, a battery electrode and a preparation method and application thereof. The lithium supplementing additive comprisesone or more than two of Li, LiP, Li3P, Li3As, LiaSb, Li2Se, Li2y-5xPxSy or LicSdSez, and 1 / 4 < / = a / b < / = 2, 0 < x < 2, 0 < y < 5, 0 < 2y-5x < 10, 2 < / = c < / = 4, 0 < d < / = 4, 0 < z < / = 4, and 1 / 2 < / = (d + z) / c < / = 4. The battery electrode comprises a battery active substance and the lithium supplementing additive. The lithium supplementing additive prepared by the method is relatively high in theoretical specific capacity, capable of efficiently supplementing lithium under the condition of relatively low content, low in cost, high in repeatability and operability, and capable of making up the loss of irreversible capacity of the battery and improving the overall energy density of the battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, mainly to the field of positive or negative electrode materials for lithium ion batteries, and in particular to a lithium supplementary additive for lithium ion batteries, a battery electrode, and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages such as high energy density, long cycle life, no memory effect, and clean and environmentally friendly. However, with the continuous miniaturization of portable electronic devices and the use of high-power and high-energy devices such as electric bicycles and electric vehicles, there are increasingly higher requirements for their energy density. [0003] In order to increase the energy density, the main methods currently used are: (1) increasing the charging voltage of the battery; (2) increasing the specific capacity of...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/36H01M4/38H01M4/134H01M10/0525
CPCH01M4/5805H01M4/5815H01M4/581H01M4/58H01M4/362H01M4/382H01M4/134H01M10/0525Y02E60/10
Inventor 孙洁刘成向黔新武阳吴兴平胡安生周朝毅李路
Owner TIANJIN UNIV
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