Phosphorus-carbon material as well as in-situ synthesis method and application thereof
An in-situ synthesis and carbon material technology, applied in structural parts, alkaline storage batteries, electrical components, etc., can solve the problems of lack of doping level, hindering the increase of P content, etc., to improve sodium storage capacity, easy to expand production, excellent The effect of electrochemical performance
Active Publication Date: 2020-12-01
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 prepared by the following method:
[0045] (1) 15mlC 6 h 12 and 75ml PCl 3 Add to a 150ml three-necked flask and mix evenly, one end of the three-necked flask is mixed with N 2 Storage devices connected, such as figure 1 Shown, N 2 Insert the bottom of the three-necked flask through the branch pipe, and the other end of the three-necked flask is connected 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 phosphorus source and carbon source in the mixing device was brought into the quartz tube by bubbling method, and the tube furnace was started, at 5°C min -1 The heating rate was increased to 700 ° C, and then kept at this temperature for 2 hours to react;
[0047] (3) After the reaction, cool naturally, carefully handle the white phosphorus accumulated at the cooling end of the quartz tube, and then scrape off the black product growing on the inner wall ...
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Abstract
The invention belongs to the field of alkali metal batteries and discloses a phosphorus-carbon material as well as an in-situ synthesis method and application thereof. The in-situ synthesis method comprises the following steps that: (1) a phosphorus source and a carbon source are uniformly mixed in a mixing device, one end of the mixing device is communicated with a carrier gas storage device, andthe other end of the mixing device is communicated with a reactor; (2) the carrier gas storage device is started, the phosphorus source and carbon source are changed into gas through a bubbling method, the gas is introduced into the reactor, and the reactor is started to carry out a carbonization reaction to generate phosphorus-doped carbon; and (3) after the reaction is finished, the reactor iscooled, and a black product is collected, and therefore, the phosphorus-carbon material can be obtained. According to the phosphorus-carbon material as well as the in-situ synthesis method and application thereof of the invention, the oxygen-free low-boiling-point carbon source and the sulfur source are used for constructing a system for in-situ synthesis of the phosphorus-carbon material with anultrahigh doping level, so that a carbonization process and a doping process are synchronously carried out, and the phosphorus-carbon material negative electrode shows very excellent 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 specifically relates to a phosphorus-carbon material and an in-situ synthesis method and application thereof. Background technique [0002] The choice of cathode materials for sodium-ion batteries is relatively wide, and the performance can reach a level close to that of cathode materials for lithium-ion batteries. However, due to the radius of sodium ions Specific lithium ion radius Large, it is difficult to embed 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 once stagnant until the development of hard carbon materials was significantly developed. Hard carbon has a high sodium storage capacity (~300mAh g -1 ) and a 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