A binary compound cu2se positive electrode material for sodium ion battery and preparation method thereof
A technology of sodium ion battery and cathode material, applied in the field of electrochemistry, can solve the problems of high cost, limited reserves and environmental pollution of lithium ion battery
Inactive Publication Date: 2015-10-07
FUDAN UNIV
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Problems solved by technology
Large-scale energy storage requires a large amount of chemical power sources. The relatively mature commercial batteries such as lead-acid batteries will cause great environmental pollution due to the use of heavy metal lead. For lithium-ion batteries, if they are used on a large scale, on the one hand, lithium The reserves on earth are limited, on the other hand the cost of Li-ion batteries is high
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[0014] The present invention is further described below by way of examples.
[0015] Take a certain amount of selenium and put it in the reaction kettle, then put the copper mesh in the reaction kettle, cover the lid of the reaction kettle, and use a mechanical pump to evacuate to 1×10 -3 Below Pa, heat the reactor to 400°C and keep it at 400°C for 2h, then cool down to room temperature. XRD diffraction pattern shows that the prepared film is Cu 2 Se.
[0016] The prepared electrode was used as a working electrode, and a high-purity sodium sheet was used as a counter electrode to assemble a simulated battery. The electrolyte is 1M NaClO 4 + EC + DMC (the volume ratio of EC to DMC is 1 / 1), and the battery assembly is carried out in an argon-filled dry box. The charging and discharging of the battery is carried out on the Land battery test system. Cu 2 Se thin film electrodes exhibit good electrochemical performance. The battery discharge platform is about 1.9V, and the ...
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Abstract
The invention belongs to the technical field of sodium-ion batteries, and particularly relates to an anode material used for a sodium-ion battery and a preparation method of the anode material. The anode material is prepared by the following steps of: putting a copper net into selenium steam to enable the copper to react with selenium, generating a layer of Cu2Se on the surface of the copper net, wherein the rest copper is used as a current collector. An electrode is used in the sodium-ion battery, the primary specific capacity is 253mAh / g, a discharge platform is 1.93 Vvs.Na+ / Na, the specific energy is 488Wh / kg, and the specific capacity is still 113.6mAh / g after the electrode cycles for 100 times. Cu2Se has the advantages of favorable electrochemical stability, high specific capacity, favorable cycle performance and simplicity in the preparation method, and is suitable for sodium-ion batteries.
Description
technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a positive electrode material for a nano-ion battery and a preparation method thereof. Background technique [0002] Due to the massive use of traditional energy sources such as fossil fuels, global environmental problems and climate change have been caused. On the other hand, the reserves of non-renewable energy sources such as fossil fuels are also limited. Therefore, the development of new energy is particularly important. Wind energy, solar energy, tidal energy, etc. are greatly affected by weather and location, so their effective use requires the use of them in combination with chemical power sources, and the electrical energy they generate is stored in chemical Power is delivered to users through the grid. Large-scale energy storage requires a large amount of chemical power sources. The relatively mature commercial batteries such as lead-acid batteries ...
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IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 岳继礼孙乾傅正文
Owner FUDAN UNIV