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

A technology of co-doping and carbon materials, applied in the preparation/purification of carbon, battery electrodes, secondary batteries, etc., can solve the problem of limited energy density and cycle performance improvement of lithium-ion batteries, affecting the energy density of lithium-ion batteries, foreign elements Low doping amount and other issues, to achieve the effect of improving energy density and cycle performance, realizing scale and industrialization, and high specific surface area

Pending Publication Date: 2022-03-15
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Effect test

Embodiment 1

[0033] Phosphorus present invention is one kind of chlorine co-doped carbon material production method, comprising the steps of:

[0034] (1) precisely weighed 100g peanut shells washed, dried, pulverized and sieved through a 40 mesh screen to obtain spare peanut shell powder;

[0035] (2) respectively, said taking 50g of PCl 5 And 50g of NH 4 Kettle, the reaction was stirred for 4h at 120 deg.] C, to give a mixture of nitrogen and phosphorus-containing chlorine-Cl successively with 100g of methylene chloride was slowly added to a hydrothermal reaction;

[0036] (3) Step (1) Preparation of peanut shell powder was added in step (2) the mixture was stirred under nitrogen and phosphorus-containing chlorine obtained 7H room temperature, the stirred mixture was collected in a centrifuge tube, a rotational speed of 4000r / min centrifugal after 10 minutes, the supernatant liquid sucked, deionized water was added to the centrifuge tube, repeated five times, the supernatant was discarded ...

Embodiment 2

[0039] Phosphorus carbon material production method according to the present embodiment is chlorine co-doped with only in step (4) the difference in heat treatment temperature is different from the embodiment in Example 1, in this embodiment the heat treatment temperature of 800 deg.] C, N and P were prepared in chlorine referred to as a carbon material doped NPCL-800.

Embodiment 3

[0041] Distinction prepared carbon material of Example 1 of the present embodiment chloride Phosphorus co-doping embodiment only in that step (4) is different from the heat treatment temperature and time, in this embodiment the heat treatment temperature is 900 ℃, the heat treatment time 2h, nitrogen and phosphorus chloride of the co-doped material is referred to as a carbon NPCL-900.

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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,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525C01B32/05
CPCH01M4/625H01M10/0525C01B32/05Y02E60/10
Inventor 王健阎帅
Owner CHANGSHA RES INST OF MINING & METALLURGY
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