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Negative electrode active material and preparation and application thereof
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A technology of negative electrode active material and nuclear particles, which is applied in the field of negative electrode active material and its preparation and application, can solve the problems of difficulty in obtaining high energy density and the like
Active Publication Date: 2020-10-16
SUZHOU UNIV
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Carbon host-based red phosphorus composites are difficult to achieve high energy density
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[0041] The invention also provides a preparation method of the negative electrode active material.
[0042] A preparation method for a negative electrode active material, comprising the steps of:
[0043] S1, providing porous TiO 2 (B) nanosheets;
[0044] S2. Embedding red phosphorus nanoparticles into porous TiO 2 (B) In the nanosheet matrix, precursor particles are obtained;
[0045] S3. Carrying out carbon coating treatment on the precursor particles to obtain a negative electrode active material.
[0046] Wherein, in step S1, the porous TiO 2 (B) Nanosheets can be prepared by themselves.
[0047] Preferably, porous TiO 2 (B) Nanosheets obtained by hydrothermal method. More preferably obtained by the following steps:
[0048] TiCl 4 Drop into ethylene glycol, stir until no gas is generated, then add an appropriate amount of deionized water, transfer the solution to the reaction kettle, cool to room temperature after hydrothermal reaction, centrifuge, wash, and dry...
Embodiment 1
[0067] 2ml of TiCl 4 Drop into 60ml of ethylene glycol, stir until no gas is generated; then add 2ml of deionized water, transfer the solution to the reaction kettle, react at 150°C for 4 hours, cool to room temperature, centrifuge, wash, and dry to obtain porous TiO 2 (B) Nanosheets.
[0068] 50 mg of porous TiO 2 (B) The nanosheets and 100mg of red phosphorus were placed in a closed quartz tube filled with argon, and the temperature was raised to 450°C and kept for 2h. Controlled cooling, CS 2 washing and drying to obtain precursor particles.
[0069] The precursor particles were immersed in the vitamin C solution, then filtered, and then carbonized by heat treatment at 600 °C for 2 h.
[0070] The obtained negative electrode active material is denoted as A1.
Embodiment 2
[0072] 2ml of TiCl 4 Drop into 60ml of ethylene glycol, stir until no gas is generated; then add 2ml of deionized water, transfer the solution to a reaction kettle, react at 250°C for 2 hours, cool to room temperature, centrifuge, wash, and dry to obtain a porous TiO 2 (B) Nanosheets.
[0073] 50 mg of porous TiO 2 (B) The nanosheets and 250 mg of red phosphorus were placed in a sealed quartz tube filled with argon, and the temperature was raised to 400° C. and kept for 4 h. Controlled cooling, CS 2 washing and drying to obtain precursor particles.
[0074] The precursor particles were immersed in vitamin C solution, then filtered, and carbonized by heat treatment at 500 °C for 4 h.
[0075] The obtained negative electrode active material is denoted as A2.
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Abstract
The invention discloses a negative electrode active material. The negative electrode active material comprises core particles and a carbon coating layer coating the core particles, wherein the core particle comprises a porous matrix and nano red phosphorus particles embedded into the porous matrix; and the porous matrix is a porous TiO2(B) nanosheet. According to the negative electrode active material, the theoretical specific capacity and tap density of TiO2(B) are high, and the composite material composed of TiO2(B) and red phosphorus with high specific capacity has high energy density and excellent tap density; the iondiffusion rate of the composite material can be improved by an open lattice channel structure and pseudocapacitance characteristics of TiO2(B); an efficient conductive network formed by the carbon coating layer can effectively improve the electronic conductivity of the composite material; both the porous TiO2(B) nanosheet and the carbon coating layer can effectively buffer the drastic change of the volume of the red phosphorus particles in the charging and discharging process, and the cycle performance of the composite material is improved. The composite materialis beneficial to research and development of high-performance lithium / sodiumion batteries. The invention also provides a preparation method and application of the negative electrode active material.
Description
technical field [0001] The invention belongs to the technical field of batteries, and relates to a negative electrode active material and its preparation and application. Background technique [0002] With the rapid development of new energy vehicles and portable electronic products, the requirements for the electrochemical performance of ion batteries (such as lithium / sodium ion batteries) are also getting higher and higher. Electrode materials are the key factors affecting the electrochemical performance of batteries. In recent years, the research on positive electrode active materials has made great progress, but the lack of high-performance negative electrode active materials hinders the development of ion batteries. Therefore, it is of great significance to research and develop negative electrode active materials with excellent performance. [0003] Red phosphorus has the advantages of high theoretical specific capacity (2596mAh / g) and abundant reserves. Moreover, red...
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