A kind of phosphorus carbon material and its in-situ synthesis method and application
An in-situ synthesis, carbon material technology, applied in structural parts, alkaline batteries, electrical components, etc., can solve problems such as hindering the increase of P content and lack of doping level, achieve one-step synthesis, improve sodium storage capacity, and easily expand production effect
Active Publication Date: 2022-07-12
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
Although this technical solution provides a method for preparing a phosphorus-carbon negative electrode, the carbonized product has undergone hydrothermal treatment and is rich in oxygen-containing groups. From the previous analysis, it can be seen that P is extremely sensitive to O and easily forms POx, which greatly hinders Increase in P content
[0005] In summary, the existing technology still lacks a phosphorus-carbon material with high doping level and large carbon storage capacity
Method used
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Embodiment 1
[0044] A phosphorus carbon material is prepared by the following method:
[0045] (1) 15ml C 6 H 12 and 75mlPCl 3 Add it to a 150ml three-necked flask and mix well. One end of the three-necked flask is mixed with N 2 storage device connectivity, such as figure 1 shown, N 2 Insert the bottom of the three-necked flask through the branch pipe, and connect the other end of the three-necked flask to the quartz tube placed horizontally on the tube furnace;
[0046] (2) Turn on N 2 storage device release N 2, the mixed gas of the phosphorus source and carbon source in the mixing device is brought into the quartz tube by the bubbling method, the tube furnace is started, and the temperature is 5 °C min. -1 The heating rate was increased to 700 ° C, and then the reaction was carried out at this temperature for 2 h;
[0047] (3) After the reaction is finished, cool naturally, carefully handle the white phosphorus that accumulates at the cooling end of the quartz tube, and then sc...
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Abstract
The invention belongs to the field of alkali metal batteries, and discloses a phosphorus carbon material and an in-situ synthesis method and application thereof. The in-situ synthesis method of the present invention comprises the following steps: (1) uniformly mixing the phosphorus source and the carbon source in a mixing device, one end of the mixing device is communicated with the carrier gas storage device, and the other end is communicated with the reactor; (2) the load is turned on Gas storage device, the phosphorus source and carbon source are turned into gas and brought into the reactor by bubbling method, and the reactor is started to carry out carbonization reaction to generate phosphorus-doped carbon; (3) After the reaction is completed, the black product is collected after the reactor is cooled , the phosphorus carbon material can be obtained. In the present invention, a system for in-situ synthesis of phosphorus-carbon materials with ultra-high doping level is constructed by using an oxygen-free low-boiling carbon source and a sulfur source, so that the carbonization and doping processes are synchronized, and the negative electrode of the phosphorus-carbon material exhibits excellent performance. electrochemical performance.
Description
technical field [0001] The invention belongs to the field of alkali metal batteries, relates to a phosphorus carbon material negative electrode material, and more particularly relates to a phosphorus carbon material and an in-situ synthesis method and application thereof. Background technique [0002] The selection of cathode materials for sodium ion batteries is relatively wide, and the performance can also reach a level close to that of cathode materials for lithium ion batteries, but due to the radius of sodium ion Specific Lithium Ion Radius Large, it is difficult to intercalate graphite and form a stable binary compound, and the sodium storage capacity of graphite is extremely low (20mAhg -1 ), the practical application of sodium-ion batteries was sluggish, until the development of hard carbon materials was significantly developed. Hard carbon has high sodium storage capacity (~300mAh g -1 ) and low discharge platform, but its cycle performance and rate characteris...
Claims
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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/054H01M10/24
CPCH01M4/583H01M4/625H01M4/362H01M10/054H01M10/24Y02E60/10
Inventor 蒋凯颜杰王康丽李威王如星
Owner HUAZHONG UNIV OF SCI & TECH