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Potassium copper manganese oxide and preparation method thereof, and positive electrode as well as preparation method and application thereof

A technology of copper manganese oxide and positive electrode, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of unstable skeleton structure, poor cycle stability, and large potassium ion size, and achieve good cycle stability and improve work efficiency. Effect of improving voltage and cycle stability

Inactive Publication Date: 2018-09-21
JILIN UNIV
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  • Description
  • Claims
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Problems solved by technology

However, the size of potassium ions is large, and it is difficult for most positive electrode materials to adapt to the structural changes during the intercalation / extraction of potassium. The application of potassium ions to positive electrode materials inevitably faces the problem of unstable skeleton structure, which leads to the use of positive electrode materials. There is still the problem of poor cycle stability in the process

Method used

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  • Potassium copper manganese oxide and preparation method thereof, and positive electrode as well as preparation method and application thereof
  • Potassium copper manganese oxide and preparation method thereof, and positive electrode as well as preparation method and application thereof
  • Potassium copper manganese oxide and preparation method thereof, and positive electrode as well as preparation method and application thereof

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preparation example Construction

[0031] The invention provides a preparation method of the potassium copper manganese oxide, comprising the following steps:

[0032] Will K 2 CO 3 , CuO and MnO 2 Mix and grind to obtain a raw material mixture; the K 2 CO 3 , CuO and MnO 2 The molar ratio is 17:17:33;

[0033] The raw material mixture is sequentially subjected to molding and sintering treatment to obtain potassium copper manganese oxide; the sintering temperature is 700-1000° C., and the sintering time is 15 hours.

[0034] The present invention will K 2 CO 3 , CuO and MnO 2 Mix and grind to obtain a raw material mixture. In the present invention, the K 2 CO 3 , CuO and MnO 2 The molar ratio is 17:17:33. In the present invention, the K 2 CO 3 , CuO and MnO 2 There is no special requirement for the source of , and commercially available products well known to those skilled in the art can be used. The present invention has no special requirements on the specific implementation of the mixing and ...

Embodiment 1

[0067] According to K 2 CO 3 , CuO and MnO 2 The molar ratio of 17:17:33 weighed K 2 CO 3 , CuO and MnO 2 , put these three raw materials in an agate mortar for half an hour to make them evenly mixed, then press the mixture into a disc with a thickness of about 1.3cm under 20MPa, put the disc in a corundum porcelain boat and place it in the Sintering at 700-1000° C. for 15 hours in a muffle furnace to obtain a sintered product. The prepared sintered product was analyzed by XRD, the results are as follows figure 1 As shown, the structure refinement of the X-ray diffraction peaks, and the comparison between the detected and calculated values, can confirm that the structure conforms to the Ccmm space group (ICSD 156080), and the lattice parameters are The Rwp value is 13.84. From this, it can be seen that the target product with a layered structure was obtained.

[0068] Grinding the sintered product to obtain K with a particle size of 100-500nm 0.68 Cu 0.34 mn 0.66 o...

Embodiment 2

[0070] The K obtained in Example 1 0.68 Cu 0.34 mn 0.66 o 2 Grinding to obtain K with a particle size of 100-500nm 0.68 Cu 0.34 mn 0.66 o 2 powder.

[0071] Will K 0.68 Cu 0.34 mn 0.66 o 2The powder is mixed with conductive additive Super P and polyvinylidene fluoride at a mass ratio of 8:1:1, wherein polyvinylidene fluoride is provided in the form of a PVDF organic solution with a mass fraction of 7%, and N-methyl-2-pyrrolidone is used as Solvent, grind in an agate mortar for 15 minutes, until it is well mixed into a slurry. Use a scraper to evenly coat the ground slurry on the aluminum foil cleaned with alcohol cotton, and dry the coated electrode material in a vacuum oven at 100-120°C for 12 hours. The electrode material taken out of the oven needs to be Press at 10MPa for 5 minutes to ensure that the electrode material will not be de-powdered during the cycle and affect the cycle performance of the battery. Cut the pressed positive electrode material into 8×8mm...

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Abstract

The invention provides a potassium copper manganese oxide and a preparation method thereof, and a positive electrode adopting the potassium copper manganese oxide as well as a preparation method and application of the positive electrode. The potassium copper manganese oxide provided by the invention is of a layered structure, and all elements cooperate harmoniously, so that the structural stability of the potassium copper manganese oxide is improved, the ionic conductivity is better increased, and the potassium copper manganese oxide has excellent cycle stability. The results of the embodiments show that the positive electrode material prepared from the potassium copper manganese oxide provided by the invention has a charging capacity retention rate of 71.1% and a discharge capacity retention rate of 63.9% after a potassium ion battery is charged and discharged for 39 times in a using process, so that the cycle stability is good.

Description

technical field [0001] The invention belongs to the technical field of potassium ion batteries, and in particular relates to a potassium copper manganese oxide and a preparation method thereof, a positive electrode and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in electronic devices due to their clean and efficient, high energy density and long cycle life. However, due to the lack of lithium resource reserves, the cost of lithium-ion batteries is too high, and the application prospects of lithium-ion batteries in large-scale energy storage devices are not optimistic. It is particularly important to develop cheaper and more efficient battery systems. [0003] Potassium has a high reserve and a low standard oxidation-reduction potential, which has gradually attracted widespread attention in recent years. However, the size of potassium ions is large, and it is difficult for most positive electrode materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/131
CPCH01M4/131H01M4/505Y02E60/10
Inventor 杜菲陈曦孟醒陈楠陈岗王春忠
Owner JILIN UNIV
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