Calcium ion battery cathode active material, cathode material, calcium ion battery cathode, calcium ion battery and preparation method and application thereof

A technology of battery negative electrode and active material, which is applied in electrode manufacturing, battery electrode, electrode collector coating, etc., can solve the problems of poor rate performance and cycle performance, slow calcium ion kinetics, and high calcium metal activity. Multiple storage sites, alleviating insufficient lithium resources, and good conductivity

Active Publication Date: 2019-04-26
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the research on calcium-ion batteries has just started, and calcium sheets are usually used as the negative electrode material to assemble half-cells. However, due to the high activity of calcium metal, there are great potential safety hazards.
In addition, other reported anode materials such as calcium fluoride, vanadium pentoxide, carbon materials, and metal tin generally have the disadvantages of low capacity, slow kinetics of calcium ions in the material, and poor rate performance and cycle performance.

Method used

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  • Calcium ion battery cathode active material, cathode material, calcium ion battery cathode, calcium ion battery and preparation method and application thereof
  • Calcium ion battery cathode active material, cathode material, calcium ion battery cathode, calcium ion battery and preparation method and application thereof
  • Calcium ion battery cathode active material, cathode material, calcium ion battery cathode, calcium ion battery and preparation method and application thereof

Examples

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preparation example Construction

[0085] According to a fourth aspect of the present invention, there is provided a method for preparing the negative electrode of the above-mentioned calcium ion battery, comprising the following steps:

[0086] The anode material of the calcium ion battery, the conductive agent, the binder and the solvent are mixed to form a slurry, which is coated on the surface of the anode current collector to obtain the anode of the calcium ion battery.

[0087] Solvents include, but are not limited to, NMP (N-methylpyrrolidone) or water.

[0088] The negative electrode material is made into slurry, and the negative electrode material layer is formed after coating to obtain the negative electrode, and the preparation is simple.

[0089] According to a fifth aspect of the present invention, a calcium ion battery is provided, including a positive electrode, the above negative electrode of the calcium ion battery or the negative electrode prepared by the above method for preparing the negativ...

Embodiment 1

[0107] A calcium ion battery, the active material of the positive electrode is calcium vanadate, and the active material of the negative electrode is Nb 2 CT x .

[0108] The preparation method of calcium ion battery comprises the following steps:

[0109] (1) Preparation of battery negative electrode: 0.8g Nb 2 CT x , 0.1g conductive carbon black, 0.1g polyvinylidene fluoride were added to 2mL nitrogen methyl pyrrolidone solution, fully ground to obtain a uniform slurry; then the slurry was evenly coated on the surface of copper foil (ie negative current collector) and vacuum dried 12h. Cut the electrode sheet obtained by drying into the required size, and use it as the positive electrode of the battery after compaction;

[0110] (2) Prepare diaphragm: cut the glass fiber film into sheets of required size, wash and dry as diaphragm for subsequent use;

[0111] (3) Preparation of electrolyte: Weigh 1.32g calcium hexafluorophosphate and add to 0.8mL ethylene carbonate (EC...

Embodiment 2-15

[0115] The only difference between Examples 2-15 and Example 1 is that the negative electrode active material is different, as shown in Table 1.

[0116] Table 1

[0117] Example number

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Abstract

The invention discloses a calcium ion battery cathode active material, a cathode material, a calcium ion battery cathode, a calcium ion battery and a preparation method and application thereof, and relates to the technical field of calcium ion batteries. The cathode active material of the calcium ion battery comprises MXene or a composite material thereof, wherein the composition general formula of the MXene is Mn+1Xn or Mn+1XnTx, wherein M is a transition metal element, X is a carbon or nitrogen element, Tx is a surface functional group, and n is equal to 1, 2 or 3. According to the invention, the MXene or the composite material thereof is used in the cathode active material of the calcium ion battery, the MXene has good conductivity and is beneficial to the transmission of electrons, more storage sites can be provided, the two-dimensional layered material is beneficial to the rapid diffusion of Ca2+ between layers, a rapid calcium ion transmission channel is provided, fast embedmentand out-of-embedment performances can be achieved, the material has a stable structure, the calcium ion battery prepared by adopting the material has the advantages of long cycle life, high specific capacity and high rate performance.

Description

technical field [0001] The invention relates to the technical field of calcium ion batteries, in particular to a negative electrode active material of a calcium ion battery, a negative electrode material, a negative electrode of a calcium ion battery, a calcium ion battery and a preparation method and application thereof. Background technique [0002] In recent years, as people's demand for portable electronic devices and electric vehicles has increased, limited lithium resources have been consumed faster and faster, and the price of lithium-ion batteries has continued to rise. It is increasingly difficult to find new energy storage devices that can replace lithium-ion batteries. more and more people's attention. Among them, calcium resources are abundant, widely distributed, low cost, and Ca / Ca 2+ The standard electrode potential of lithium ion is -2.87V, which is very close to the standard electrode potential of lithium ion, and the redox process of calcium ion has the tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/38H01M4/583H01M4/04H01M4/13H01M4/139H01M10/054
CPCH01M4/0404H01M4/13H01M4/139H01M4/362H01M4/38H01M4/58H01M4/583H01M10/054Y02E60/10
Inventor 唐永炳王勇张帆
Owner SHENZHEN INST OF ADVANCED TECH
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