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A conductive agent suitable for lithium iron phosphate material and preparation method thereof

A technology of lithium ferrous phosphate and conductive agent, which is applied in the direction of circuits, electrical components, battery electrodes, etc., and can solve the problems of large residual capacity of electrodes, low utilization rate of active materials, and insufficient discharge depth.

Active Publication Date: 2015-09-23
杭州金马新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a conductive agent suitable for lithium ferrous phosphate material and its preparation method, which mainly solves the problem that the internal resistance of the lithium ferrous phosphate electrode in the prior art is relatively large, and the depth of discharge is not enough, which leads to the utilization of active materials. Low efficiency, large residual capacity of the electrode and other technical problems

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  • A conductive agent suitable for lithium iron phosphate material and preparation method thereof
  • A conductive agent suitable for lithium iron phosphate material and preparation method thereof

Examples

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Embodiment 1

[0021] Embodiment 1: A conductive agent suitable for lithium ferrous phosphate material in this example, the mass ratio of carbon nanotubes, conductive carbon black, and conductive graphite is 1:25:1.

[0022] A preparation method for a conductive agent suitable for lithium iron phosphate materials, the steps are: under the condition of a constant temperature of 25 ° C, 1 g of conductive carbon black is added to 20 ml of ethanol solution, and then 1 g of cobalt nitrate, 1 g of nickel nitrate, and 1 g of zinc nitrate are added. Wherein, the whole process was carried out under the condition of stirring and ultrasonic for 12h. After 12 hours, it was heated to become a rheological phase, and put into a high-temperature furnace for heating. During the heating process, argon gas was always passed through, and the heating temperature was maintained at 1500°C for 3 hours. Cooled to room temperature, washed with 10mol / L hydrochloric acid for 12h, suction filtered, and dried for 12 hour...

Embodiment 2

[0029] Embodiment 2: A suitable conductive agent for lithium ferrous phosphate material in this example, the mass ratio of carbon nanotubes, conductive carbon black, and conductive graphite is 1:30:1.

[0030] A preparation method for a conductive agent suitable for lithium iron phosphate materials, the steps are: under the condition of a constant temperature of 25 ° C, 1 g of conductive carbon black is added to 20 ml of ethanol solution, and then 1 g of cobalt nitrate, 1 g of nickel nitrate, and 1 g of zinc nitrate are added. Wherein, the whole process was carried out under the condition of stirring and ultrasonic for 12h. After 12 hours, it was heated to become a rheological phase, and put into a high-temperature furnace for heating. During the heating process, argon gas was always passed through, and the heating temperature was maintained at 1500°C for 3 hours. Cooled to room temperature, washed with 10mol / L hydrochloric acid for 12h, suction filtered, and dried for 12 hour...

Embodiment 3

[0032] Embodiment 3: A conductive agent suitable for lithium ferrous phosphate material in this example, the mass ratio of carbon nanotubes, conductive carbon black, and conductive graphite is 1:35:1.

[0033] A preparation method for a conductive agent suitable for lithium iron phosphate materials, the steps are: under the condition of a constant temperature of 25 ° C, 1 g of conductive carbon black is added to 20 ml of ethanol solution, and then 1 g of cobalt nitrate, 1 g of nickel nitrate, and 1 g of zinc nitrate are added. Wherein, the whole process was carried out under the condition of stirring and ultrasonic for 12h. After 12 hours, it was heated to become a rheological phase, and put into a high-temperature furnace for heating. During the heating process, argon gas was always passed through, and the heating temperature was maintained at 1500°C for 3 hours. Cooled to room temperature, washed with 10mol / L hydrochloric acid for 12h, suction filtered, and dried for 12 hour...

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Abstract

The invention relates to a preparation method a lithium ion battery, particularly relates to a conductive agent applicable to a lithium iron phosphate material and a preparation method of the conductive agent, and mainly solves the technical problems in the prior art that the utilization rate of an active material is low, the residual capacity of an electrode is great and the like caused by great inner resistance and not enough discharging depth of the lithium iron phosphate electrode. The method provided by the invention comprises the following steps: under a constant-temperature condition, slowly adding conductive carbon black into a dispersant and a salt solution; heating and agitating to form a rheological phase; putting the rheological phase into a high-temperature furnace and heating; in a heating process, introducing inert gas all the time and cooling the rheological phase to the room temperature along with a furnace; washing with a strong acid and filtering; drying in a vacuum box under a high-temperature condition to prepare the treated conductive carbon black; and mixing a carbon nano tube, the conductive carbon black and conductive graphite according to a mass ratio of (0.1-1) to (0.1-5) to (0.1-1) to prepare the conductive agent.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery, in particular to a conductive agent suitable for lithium iron phosphate material and a preparation method thereof. Background technique [0002] The energy crisis and environmental issues have attracted more and more attention from the society, and the development of sustainable strategies must choose new energy sources to replace non-renewable petroleum resources. Among the top ten technologies with the most development potential in the 21st century, high-energy batteries are listed as the third. In March 2008, the United States spent as much as 14.1 billion U.S. dollars in government funds for the development and production of electric vehicle technology and to encourage consumption. In March 2009, China announced the "Auto Industry Adjustment and Revitalization Plan", investing 10 billion yuan in special funds to develop key technologies such as new energy vehicles and vehicle ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 李旺李冠锋孙加欣何兵胡东阁王汉杰
Owner 杭州金马新能源科技有限公司
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