Secondary battery additive, processing method thereof and secondary battery
A secondary battery and processing method technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problems of limited improvement of high-rate discharge performance and other issues
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[0024] The raw material additives that can be used in the present invention can be purchased commercially or can be prepared by oneself. The preparation method is not limited, and a common preparation method can be used. For example: carbon fiber can be produced by solid-phase carbonization of high-molecular organic fibers or gas-phase pyrolysis of low-molecular hydrocarbons. At present, most of the carbon fibers sold in the world are made by solid-phase carbonization of polyacrylonitrile fibers. The resulting step is A pre-oxidation: heating in the air and maintaining at 200-300 degrees for tens to hundreds of minutes. The purpose of pre-oxidation is to transform the linear molecular chain of polyacrylonitrile into a heat-resistant ladder structure, so that it will not melt or burn during high-temperature carbonization and maintain the fiber state. B Carbonization: Heating to 1200-1600 degrees in an inert atmosphere, and maintaining it for a few minutes to tens of minutes, ...
Embodiment 1
[0031] 1. Processing additives
[0032] Weigh 10 parts by weight of KOH, and use distilled water to prepare a 30 wt% solution at room temperature (concentration of a saturated KOH solution at room temperature is 35 wt%). And 1 part by weight of activated carbon powder (average particle diameter 10 μm, specific surface area 800m 2 / g, porosity 35%, purchased from Guangzhou Chemical Reagent Factory) added wherein and soaked for 15 hours, took out, baked at 120°C for 10 hours, then transferred the dried sample to a quartz glass tube furnace, and heated it under N 2 Under protection, the temperature was raised to 800°C at a rate of 10°C / min, kept for 3 hours, and then naturally cooled to room temperature.
[0033] The sample after the heat treatment is fully washed successively with 10wt% hydrochloric acid solution and distilled water until the pH value of the system is neutral (that is, the distilled water for rinsing the sample is neutral), put it into a sealed mixer after dryi...
Embodiment 2
[0042] 1. Processing additives
[0043] According to the method of embodiment 1, the difference is: the average particle diameter of activated carbon powder is 8 μ m, and the specific surface area is 1000 m 2 / g, porosity 35%; N 2 Under protection, the temperature was raised to 900°C at a rate of 20°C / min, and kept for 1 hour; soaked in saturated NaOH solution at room temperature for 10 hours; and oxidized with ozone for 1 hour.
[0044] 2. Manufacture of cathode sheet for lithium-ion secondary battery:
[0045]Add 4 parts by weight of the treated activated carbon obtained in step 1 into 100 parts by weight of lithium cobaltate (Changsha Ruixiang), then add 1 part by weight of conductive agent acetylene black and mix well. Use 5 parts by weight of PVDF as a binder, add 40g of NMP to mix and stir evenly, and evenly coat on aluminum foil, then dry at 80°C, calender, and slice to obtain a positive electrode with length×width×thickness=240mm×33.5mm×0.38mm piece. The amount of ...
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