Phosphate additive for rich-lithium manganese-based positive electrode, preparation method of phosphate additive, and positive electrode

A lithium-rich manganese-based, phosphate-based technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrical components, etc., to achieve the effect of improving cycle performance and rate performance, and beneficial to electrochemical performance

Inactive Publication Date: 2018-10-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, few additives dedicated to lithium-rich manganese-based materials have been reported

Method used

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  • Phosphate additive for rich-lithium manganese-based positive electrode, preparation method of phosphate additive, and positive electrode
  • Phosphate additive for rich-lithium manganese-based positive electrode, preparation method of phosphate additive, and positive electrode
  • Phosphate additive for rich-lithium manganese-based positive electrode, preparation method of phosphate additive, and positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Add 2.76g of lithium hydroxide (LiOH) into a sample bottle with a capacity of 50mL, and add 20mL of deionized water and a Teflon stir bar of suitable length; seal the sample bottle and place it on a heatable magnetic stirrer On, set the temperature at 60°C and rotate at 300 rpm to dissolve lithium hydroxide into a saturated aqueous solution of lithium hydroxide; add 3 g of sodium trimetaphosphate to a saturated aqueous solution of lithium hydroxide to obtain a mixture;

[0045](2) Seal the sample bottle containing the mixture and place it on a heatable magnetic stirrer to continue stirring at a constant temperature of 60° C. for 10 h to obtain a solution containing suspended matter, and then centrifuge the solution containing suspended matter at a speed of 4500 rpm, First wash with deionized water for 3 times, then wash with ethanol for 3 times, then vacuum-dry at 80°C for 12 hours to obtain a white powder containing part of crystal water, then put the white powder i...

Embodiment 2～5

[0053] Adopt the method identical with embodiment 1, its difference is only that LTMP and PVP adopt the mass shown in table 1 to add.

[0054] Table 1 Addition amount of LTMP and PVP / g

[0055]

[0056] The performance of the lithium-rich manganese-based positive electrode sheet half-cells prepared in Examples 2-5 after a cycle of 60 cycles was measured, and the results are shown in Table 2.

[0057] Table 2. Discharge mass specific capacity of lithium-rich manganese-based positive electrode sheet in the 60th cycle cycle obtained in Examples 2-5

[0058] Example number

[0059] The SEM figure and image 3 Similar; The surface SEM figure of the obtained lithium-rich manganese-based positive pole sheet is the same as Figure 4 similar.

Embodiment 6～8

[0061] Using the same method as in Example 1, only using different lithium-rich manganese-based materials, see Table 3 for details

[0062] Table 3 Composition of lithium-rich manganese-based materials with different components

[0063] Example number

[0064] The performance of the lithium-rich manganese-based positive electrode sheet half-cell prepared in Examples 6-10 after a cycle of 60 cycles was measured, and the results are shown in Table 4.

[0065] Table 4 Discharge mass specific capacity of lithium-rich manganese-based positive electrode sheet in the 60th cycle cycle obtained in Examples 6-10

[0066] Example number

[0067] The SEM figure and image 3 Similar; The surface SEM figure of the obtained lithium-rich manganese-based positive pole sheet is the same as Figure 4 similar.

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Abstract

The invention relates to a phosphate additive for a rich-lithium manganese-based positive electrode, a preparation method of the phosphate additive and a rich-lithium manganese-based positive electrode using the additive, and belongs to the technical field of lithium ion batteries. The additive is a combination of lithium trimetaphosphate or lithium trimetaphosphate and polyvinylpyrrolidone; the rich-lithium manganese-based positive electrode material and a conduction agent can have a more stable solid electrolyte phase interface in the charging-discharging circulation; the improvement of electrochemical performance, such as the circulation performance and power performance of the rich-lithium manganese-based positive electrode material is facilitated; the lithium trimetaphosphate is prepared by an ion exchange method; simplicity and easy implementation are realized; the scaled production conditions are realized; the positive electrode plate contains the additive. Under the test conditions of 2V to 4.6V electrochemical window and 0.2C charging and discharging current, the rich-lithium manganese-based positive electrode has the advantages that the first time Kulun efficiency is greater than 75 percent; after the circulation for 50 weeks, the mass ratio volume is still maintained at 215mAh*g<-1>.

Description

technical field [0001] The invention relates to a phosphate additive for a lithium-rich manganese-based positive electrode, a preparation method and a lithium-rich manganese-based positive electrode using the additive, belonging to the technical field of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used as a typical representative of secondary batteries. Lithium-ion batteries generally use transition metal oxides as the positive electrode and lithium intercalation materials as the negative electrode, so that lithium ions are intercalated and extracted between the two electrodes through the organic electrolyte containing lithium salts to achieve the purpose of storing and releasing energy. [0003] The positive electrode of a commercial lithium-ion battery is mainly composed of an active material, a conductive agent, and a binder. Among them, the active materials mainly include lithium iron phosphate, lithium cobalt oxide, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0567
CPCH01M4/13H01M4/139H01M10/0567Y02E60/10
Inventor 苏岳锋李维康吴锋包乌日古木拉陈来卢赟王敬包丽颖陈实
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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