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Lithium battery anode material and method for improving cycle performance of battery

A positive electrode material and battery cycle technology, applied in battery electrodes, secondary battery charging/discharging, secondary batteries, etc., can solve the problems of fast capacity decay and failure to meet application requirements, and achieve high capacity retention and meet application requirements Effect

Inactive Publication Date: 2014-12-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Charged to 4.6V, the discharge specific capacity is even as high as 200 mAh / g, but the capacity decay is still fast, which cannot meet the application requirements

Method used

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  • Lithium battery anode material and method for improving cycle performance of battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: The lithium battery positive electrode material used in this embodiment is mainly composed of positive electrode active material and phosphate. The phosphate content in the positive electrode of the lithium battery is 2wt% of the active material of the positive electrode. The positive active material is lithium nickel cobalt manganese oxide, layered crystal structure, chemical composition LiNi 1-x-y co x mn y o 2 , where x=0.15, y=0.4. Phosphate is Ba 3 (PO 4 ) 2 Nano powder, the purity is more than 99.9wt%.

[0037] The positive electrode sheet was cut into a disc with a diameter of 12 mm, and the lithium foil was used as the negative electrode to assemble the button battery. The mixed lithium battery electrolyte is selected, the ratio is EC:DEC:DMC (diethyl carbonate: dimethyl carbonate: ethyl methyl carbonate) is 1:1:1, and the electrolyte is 1mol / L LiPF6.

[0038] (1) Charge and discharge the assembled battery for the first time: place it at 4...

Embodiment 2

[0040] Embodiment 2: The lithium battery positive electrode material used in this embodiment is mainly composed of positive electrode active material and phosphate. The phosphate content in the positive electrode of the lithium battery is 1wt% of the active material of the positive electrode. The positive active material is lithium nickel cobalt manganese oxide, layered crystal structure, chemical composition LiNi 1-x-y co x mn y o 2 , where x=0.2, y=0.3. Phosphate is Ba 3 (PO 4 ) 2 Nano powder, the purity is more than 99.9wt%.

[0041] The positive electrode sheet was cut into a disc with a diameter of 12 mm, and the lithium foil was used as the negative electrode to assemble the button battery. The mixed lithium battery electrolyte is selected, the ratio is EC:DEC:DMC (diethyl carbonate: dimethyl carbonate: ethyl methyl carbonate) is 1:1:1, and the electrolyte is 1mol / L LiPF6.

[0042] (1) Assemble the positive electrode of the lithium-ion battery with added lithium...

Embodiment 3

[0044] Embodiment 3: The lithium battery positive electrode material used in this embodiment is mainly composed of positive electrode active material and phosphate. The phosphate content in the positive electrode of the lithium battery is 0.5wt% of the active material of the positive electrode. The positive active material is lithium nickel cobalt manganese oxide, layered crystal structure, chemical composition LiNi 1-x-y co x mn y o 2 , where x=0.3, y=0.2. Phosphate is Ba 3 (PO 4 ) 2 Nano powder, the purity is more than 99.9wt%.

[0045] The positive electrode sheet was cut into a disc with a diameter of 12 mm, and the lithium foil was used as the negative electrode to assemble the button battery. The mixed lithium battery electrolyte is selected, the ratio is EC:DEC:DMC (diethyl carbonate: dimethyl carbonate: ethyl methyl carbonate) is 1:1:1, and the electrolyte is 1mol / L LiPF6.

[0046] (1) Assemble the positive electrode of the lithium-ion battery with added lithi...

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Abstract

The invention provides a lithium battery anode material and a method for improving the cycle performance of a battery, which belong to the field of lithium ion secondary batteries. The method comprises the following steps of: adding a small amount of phosphate of barium into a lithium battery plate taking a nickel-cobalt-manganese ternary compound oxide as an active material, wherein the adding amount is 0.5-2 percent based on the amount of the anode active substance; and performing two charging-discharging processes with controlled current, voltage and temperature on the battery with the additive. Due to the adoption of the method, the cycle performance of the battery is remarkably improved at the voltage of 4.4V, and the cycle performance is remarkably improved at the temperature of 50 DEG C.

Description

technical field [0001] The invention relates to the field of lithium ion secondary batteries, in particular to a lithium battery using nickel, cobalt and manganese multi-element composite oxides as positive electrode active materials. Background technique [0002] Lithium-ion batteries are the main power source of portable electronic products such as mobile phones and notebook computers. The miniaturization of these electronic devices requires lithium-ion secondary batteries to have high capacity and good cycle performance. At present, the application of lithium batteries in hybrid electric vehicles (HEV) and electric vehicles (EV) is increasing rapidly. The power battery requires high energy storage density (high energy), and the working state of the battery is also at a relatively high temperature. [0003] The US patent (US20030027048) proposes to control the three elements of nickel, cobalt and manganese within a certain range to synthesize LiNi x mn y co 1-x-y o 2 S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/131H01M10/42H01M10/0525H01M10/44
CPCY02E60/122Y02E60/10
Inventor 王剑华郭玉忠王宇黄瑞安
Owner KUNMING UNIV OF SCI & TECH
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