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Two-pole same-temperature same-trough electrolysis preparation method for lithium cobaltate and metallic cobalt

A technology of electrolyzing lithium cobalt oxide and metal cobalt, which is applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of safety hazards for environmental production personnel, low utilization rate, and large energy loss, so as to avoid the problem of acid mist and energy utilization The effect of high rate and low temperature

Active Publication Date: 2016-09-21
NANJING UNIV
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  • Description
  • Claims
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Problems solved by technology

At present, industrial production mainly adopts the insoluble anode electrolysis method of cobalt chloride system to produce metal cobalt, and cobalt ions are discharged and precipitated at the cathode, but in this method, a large amount of chlorine gas will be precipitated at the anode, which will cause huge safety hazards to the environment and production personnel
At the same time, the single electrolytic metal product also brings the disadvantages of large energy loss and low utilization rate.

Method used

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  • Two-pole same-temperature same-trough electrolysis preparation method for lithium cobaltate and metallic cobalt
  • Two-pole same-temperature same-trough electrolysis preparation method for lithium cobaltate and metallic cobalt
  • Two-pole same-temperature same-trough electrolysis preparation method for lithium cobaltate and metallic cobalt

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Experimental program
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Effect test

Embodiment 1

[0038] In this experiment, LiOH·H 2 O. Li 2 O and CoO are used as element donors, and lithium cobaltate and metal cobalt are prepared by electro-deoxidation method. The steps are as follows:

[0039] (a) Sample preparation: place the carbon nanotube paper in a tube furnace, heat it to 1000° C. at a heating rate of 10° C. / min, and keep it warm for 2 hours to remove organic impurities on the surface of the carbon nanotubes. Measure 4mL of 38% concentrated hydrochloric acid and 50mL of deionized water, mix and stir, prepare 1mol / L dilute hydrochloric acid for later use, soak metal Ni sheets and Co sheets of a certain size in dilute hydrochloric acid and acetone respectively for 15min, then take them out, and use Rinse with deionized water and dry in an oven at 50°C for later use;

[0040] (b) Preparation of molten salt electrolyte: according to the molar ratio of K and Li is 1:1, weigh 24g KOH, 3.214g Li 2 O and 9g LiOH·H 2 O, KOH, Li 2 O and LiOH·H 2 O is fully ground, and...

Embodiment 2

[0047] In this experiment, LiOH·H 2 O. Li 2 O and CoO are used as element donors, and lithium cobaltate and metal cobalt are prepared by electro-deoxidation method:

[0048] (a) Sample preparation: the same method as in Example 1, the carbon nanotube paper is placed in a tube furnace and heated to 1000 ° C to treat the surface organic impurities, and then metal Ni sheets and Co sheets of a certain size are respectively heated in dilute hydrochloric acid Soak in acetone for 15 minutes, then take it out, rinse it with deionized water, and place it in an oven at 50°C to dry for later use. In addition, weigh the quality of the metal nickel sheet;

[0049] (b) Preparation of electrolyte molten salt: According to the molar ratio of the total moles of K and Cs to Li is 5:1, weigh 24g KOH, 7.12g CsOH, 0.714g Li 2 O and 2g LiOH·H 2 O, KOH, CsOH, Li 2 O and LiOH·H 2 O is fully ground, and then transferred to a Ni crucible placed on a heating plate. After the solid powder is fully m...

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Abstract

The invention provides a two-pole same-temperature same-trough electrolysis preparation method for lithium cobaltate and metallic cobalt. LiOH.H2O, Li2O and CoO are taken as raw material donators, and the elementary substances of lithium cobaltate and metallic cobalt are prepared by using an electro-deoxiedation method. The two-pole same-temperature same-trough electrolysis preparation method has the beneficial effects that firstly, CoO is taken as a common element donator for the first time, and lithium cobaltate and metallic cobalt are separated out on a working electrode and a counter electrode at the same time through electrolytic oxidation and reduction, so that the technology is simple, and the energy utilization rate is high; and secondly, lithium cobaltate is synthetized compared with a high-temperature solid-phase synthesis method, so that the temperature is greatly reduced, and the energy loss can be effectively reduced. Meanwhile, compared with the high-temperature solid-phase synthesis method with single adjustment and control parameter, the electrolytic process can effectively regulate and control the particle size of the product by adjusting substance matching, synthesis parameters and time and the like, so that the controllability is high.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic functional materials and metal extraction, and in particular relates to a method for preparing electrolytic lithium cobaltate and metal cobalt with two electrodes at the same temperature and in the same tank. Background technique [0002] Lithium-ion batteries are the most widely used commercial batteries in today's society. As a new type of clean energy, they are widely used in new energy electric vehicles, solar street lamp energy storage, solar and wind power generation energy storage, power tools and electronic products. Currently the best product to replace lead-acid batteries, the market prospect is very broad. Lithium cobalt oxide (LiCoO 2 ) as the positive electrode material of lithium-ion batteries is widely used in mobile phones, notebook computers and other portable electronic devices because of its stable performance, high specific capacity and simple preparation proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/525
CPCH01M4/38H01M4/525Y02E60/10
Inventor 张会刚沈子涵
Owner NANJING UNIV
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