Nitrogen-phosphorus-chlorine co-doped carbon material, preparation method thereof and application of nitrogen-phosphorus-chlorine co-doped carbon material in lithium battery

Abstract

According to the nitrogen-phosphorus-chlorine co-doped carbon material, the doping amount of nitrogen is 5%-10% by weight, the doping amount of chlorine is 7%-30% by weight, and the doping amount of phosphorus is 7%-13% by weight. The preparation method comprises the following steps: adding PCl5 and NH4Cl into a chlorine-containing organic solvent to carry out solvothermal reaction; biomass powder is added into the dissolved thermal reaction product to be stirred, the stirred mixture is centrifuged, washed and dried, and a nitrogen-phosphorus-chlorine co-doped carbon material precursor is obtained; and under the protection of inert gas, carrying out high-temperature heat treatment on the nitrogen-phosphorus-chlorine co-doped carbon material precursor to obtain the nitrogen-phosphorus-chlorine co-doped carbon material. The nitrogen-phosphorus-chlorine co-doped carbon material is applied to a lithium battery as a lithium battery conductive agent. Compared with the traditional nitrogen-doped carbon material, the nitrogen-phosphorus-chlorine co-doped carbon material can provide more excellent channels for transmission of ions and electrons, has high stability, and improves the energy density and cycle performance of the lithium ion battery.

Description

Technical field [0001] The present invention pertains to the art of preparing a carbon material, particularly to a carbon material and a total nitrogen and phosphorus chloride preparation and their use in lithium doping. Background technique [0002] In the lithium battery charge and discharge cycles, there are positive and negative current through the pole piece, there will be a net reaction occurs, the electrodes show lost its balance, the deviation from the equilibrium potential of the electrode potential, a polarization is generated. Lithium polarization may be divided into ohmic polarization, electrochemical polarization and concentration polarization. The reaction is an important parameter polarization voltage lithium ion battery internal electrochemical reaction, if unreasonable long polarization voltage will result in accelerated deposition of lithium metal negative electrode, severe cases may cause a short circuit pierce the septum. The initial lithium experimental data,...

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Problems solved by technology

[0003] Traditional lithium-ion batteries are generally carbon materials, but the addition of traditional carbon material conductive agents is as high as 0.5% of the mass of the positive electrode material, which affects the energy density of lithium-ion batteries. Therefore, as the energy density requirements of lithium-ion batteries increase , the less the amount of conductive agent is, the better

[0004] Heteroelement-doped hierarchical porous carbon can improve the energy density and cycle performance of lithium-ion batteries. Limited improvements in energy density and cycle performance

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