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Lithium phosphate additive, lithium-rich manganese-based positive electrode and lithium battery

A lithium-rich manganese-based and lithium phosphate technology is applied in lithium phosphate additives, lithium-rich manganese-based cathode materials, lithium-rich manganese-based cathodes and lithium batteries to achieve favorable electrochemical performance, cycle performance and rate performance. Improve the effect of simple and easy operation

Inactive Publication Date: 2019-03-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no report in the prior art that the insoluble substances in the electrolyte are used as additives to improve the performance of lithium batteries

Method used

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  • Lithium phosphate additive, lithium-rich manganese-based positive electrode and lithium battery
  • Lithium phosphate additive, lithium-rich manganese-based positive electrode and lithium battery
  • Lithium phosphate additive, lithium-rich manganese-based positive electrode and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Take lithium phosphate (Li 3 PO 4 ) 1g, add in the zirconia ball mill jar, and add zirconia pellets, the mass ratio of zirconia pellets and lithium phosphate is 20:1, ball mill 10h with the rotating speed of 600rpm, obtain D 50 Lithium phosphate powder with a particle size of about 0.8 μm is a lithium phosphate additive described in the present invention;

[0039](2) 0.02g and 0.98g of lithium-rich manganese-based positive electrode material Li 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 (or write 0.5Li 2 MnO 3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 ) and 0.1225g acetylene black were added to the mortar and ground for 15min to obtain a mixture;

[0040] 0.36 g of the mixture and 800 μL of 5% volume polyvinylidene fluoride (PVDF) in nitrogen methyl pyrrolidone (NMP) solution, supplemented with NMP liquid were mixed for 15 minutes, and after being mixed evenly, coated on a 16 μm thick aluminum foil and placed put into a vacuum drying oven at 80° C. for 24 hours, and cut into ...

Embodiment 2

[0046] Use lithium metaphosphate instead of lithium phosphate as the lithium phosphate additive, and the rest are the same as in Example 1.

[0047] Performance tests were carried out on the lithium-rich manganese-based positive electrodes that do not contain lithium phosphate additives and the lithium-rich manganese-based positive electrodes that contain lithium phosphate additives. The test results are as follows: figure 2 As shown, specifically:

[0048] The mass specific capacity of the half-cell 1C cycled to 150 cycles using the lithium-rich manganese-based positive electrode containing lithium metaphosphate additives as the positive electrode is 154.3 mAh g -1 .

[0049] See

[0050] Example 1.

[0051] According to the above test results, it can be proved that the lithium-rich manganese-based positive electrode sheet containing lithium metaphosphate additives has good cycle and rate performance.

Embodiment 3

[0053] Lithium polymetaphosphate was used instead of lithium phosphate as the lithium phosphate additive, and the rest were the same as in Example 1.

[0054] Performance tests were carried out on the lithium-rich manganese-based positive electrodes that do not contain lithium phosphate additives and the lithium-rich manganese-based positive electrodes that contain lithium phosphate additives. The test results are as follows: image 3 As shown, specifically:

[0055] The mass specific capacity of the half-cell 1C cycled to 150 cycles using the lithium-rich manganese-based positive electrode containing lithium phosphate additives as the positive electrode is 167.8mAh g -1 .

[0056] See

[0057] Example 1.

[0058] According to the above test results, it can be proved that the lithium-rich manganese-based positive electrode sheet containing lithium polyphosphate additives has good cycle and rate performance.

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Abstract

The invention relates to a lithium phosphate additive, a lithium-rich manganese-based positive electrode and a lithium battery, and belongs to the technical field of battery materials. The lithium phosphate additive is a salt containing lithium as main positive ions and phosphate radicals as main negative ions. The lithium-rich manganese-based positive electrode contains the lithium phosphate additive, and is obtained in a manner that the lithium phosphate additive, a lithium-rich manganese-based positive electrode material and a conductive agent are ground together to obtain a mixture I, a binding agent is added to be mixed to obtain a mixture II, a substrate of an electrode piece of the positive electrode is coated with the mixture II, and drying is performed. The positive electrode usedby the lithium battery is the lithium-rich manganese-based positive electrode. Lithium phosphate as the additive is introduced into the positive electrode made of the lithium-rich manganese-based material; and the additive can improve the electrochemical performance of the lithium-rich manganese-based positive electrode material, is simple and has practical values.

Description

technical field [0001] The invention relates to a lithium phosphate additive, a lithium-rich manganese-based positive electrode and a lithium battery, in particular to the application of the lithium phosphate additive in the lithium-rich manganese-based positive electrode material of the lithium battery, and belongs to the technical field of battery materials. Background technique [0002] Lithium-ion batteries are currently widely used, and its demand is expected to continue to show explosive growth. Lithium-ion batteries generally use transition metal oxides as the positive electrode and lithium intercalation materials as the negative electrode. 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, a binder, and a cur...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/505H01M4/485H01M10/0525H01M4/62H01M10/42C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/362H01M4/485H01M4/505H01M4/5825H01M4/62H01M10/0525H01M10/4235Y02E60/10
Inventor 陈来李维康吴锋包乌日古木拉苏岳锋卢赟王敬包丽颖陈实
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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