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CN-122024963-A - Application scene rapid matching method for hard carbon anode material of sodium ion battery

CN122024963ACN 122024963 ACN122024963 ACN 122024963ACN-122024963-A

Abstract

The application belongs to the technical field of hard carbon materials, and particularly relates to an application scene rapid matching method of a hard carbon negative electrode material of a sodium ion battery. According to the application, by detecting key physical and chemical properties (such as specific surface area, particle size distribution and pore volume) of the hard carbon anode material of the sodium ion battery, whether the hard carbon anode material meets basic requirements of specific application scenes is rapidly judged, the evaluation range in the same scene is obviously reduced, and the material introduction process is accelerated. Meanwhile, the method supports the rapid classification of different hard carbon materials into corresponding application directions, and establishes and enriches a material reserve library for each application direction.

Inventors

  • LIU YI
  • YANG JING
  • HUANG BICHENG
  • Ruan Xujian

Assignees

  • 武汉天钠科技有限公司

Dates

Publication Date
20260512
Application Date
20260130

Claims (10)

  1. 1. The application scene rapid matching method of the hard carbon anode material of the sodium ion battery is characterized by comprising the following steps of: (1) Carrying out physical property test on a given hard carbon material to obtain specific surface area, particle size distribution, micropore volume and total pore volume of the hard carbon material; (2) And according to the test result, carrying out application scene suitability judgment according to the following conditions: If the specific surface area of the hard carbon material is 3 m 2 /g to 9 m 2 /g, the maximum particle diameter Dmax is less than or equal to 35 mu m, the median particle diameter D50 is 3 mu m to 8 mu m, and the micropore volume is 0.0015 cm3/g to 0.003 cm 3 /g, judging that the hard carbon material is suitable for start-stop and low-temperature application scenes; If the specific surface area of the hard carbon material is 1m 2 /g to 5m 2 /g, the maximum particle diameter Dmax is less than or equal to 35 mu m, the median particle diameter D50 is 4 mu m to 9 mu m, and the total pore volume is 0.008 cm 3 /g to 0.015 cm 3 /g, the material is judged to be suitable for high-energy density application scenes; If the hard carbon material meets the two sets of conditions, judging that the hard carbon material can be simultaneously adapted to start and stop, low-temperature application scenes and high-energy-density application scenes; If the hard carbon material does not meet any one set of conditions, the hard carbon material is judged to be unsuitable for the two typical application scenarios defined by the method.
  2. 2. The matching method according to claim 1, wherein the micropore volume is a pore corresponding volume having a pore diameter of less than 2 nm.
  3. 3. The matching method according to claim 1, wherein the application scenario suitable for start-stop and low temperature indicates that the hard carbon material satisfies the following requirements when performing performance test: (1) The multiplying power and the circulation performance are that when the battery cell is tested in a 2Ah soft package battery cell, the battery cell is circulated for not less than 500 times at the multiplying power of 5C without sodium precipitation, and the capacity retention rate is not less than 80% after the battery cell is circulated for not less than 1000 times at the multiplying power of 5C under the normal temperature condition; (2) Low temperature cycle performance, when tested in a 2Ah soft pack cell, the capacity retention rate was 90% or greater after 100 cycles at 0.1C rate in a-10 ℃ environment, and (3) First coulombic efficiency at 0.1C current density is greater than or equal to 85% at half cell test.
  4. 4. The matching method according to claim 3, wherein the positive electrode material adopted in the 2Ah soft-package battery core comprises one or more of polyanion positive electrode material, lamellar metal oxide and Prussian blue compound, and/or, The electrolyte comprises sodium salt, an organic solvent and a functional additive, wherein the sodium salt comprises one or more of sodium hexafluorophosphate, sodium perchlorate and sodium difluorosulfimide, the organic solvent is one or more of a carbonate solvent and an ether solvent, and the functional additive comprises a film forming additive and/or a flame retardant additive.
  5. 5. The matching method of claim 1, wherein said suitability for high energy density applications indicates that the hard carbon material meets the following performance requirements when made into half cells and tested: (1) A first reversible specific capacity of greater than or equal to 310 mAh/g at a current density of 0.1C, and (2) The first coulombic efficiency is greater than or equal to 85%.
  6. 6. The matching method according to claim 3 or 5, wherein the half cell comprises a negative electrode, a counter electrode, an electrolyte and a separator, wherein the negative electrode is obtained by coating a slurry prepared by mixing the hard carbon material with a conductive agent and a binder on a current collector and drying, and/or, The half-cell test specifically comprises the step of performing constant-current charge and discharge test with 200mAh/g as the nominal gram capacity in the voltage range of 0-2.5V.
  7. 7. The matching method of claim 1, wherein the start-stop and low temperature application scenario is a sodium ion battery hard carbon negative electrode material application scenario for a vehicle start-stop system, energy storage in a low temperature environment, or power equipment.
  8. 8. The matching method of claim 1, wherein the high energy density application scenario is a sodium ion battery hard carbon negative electrode material application scenario for an electric car or an electric light vehicle.
  9. 9. The matching method of claim 1, wherein the hard carbon material is prepared from a carbon-containing precursor by pyrolytic carbonization.
  10. 10. The matching method of claim 9, wherein the carbon-containing precursor is one or more of biomass, synthetic polymer, and fossil fuel.

Description

Application scene rapid matching method for hard carbon anode material of sodium ion battery Technical Field The application belongs to the technical field of hard carbon materials, and particularly relates to an application scene rapid matching method of a hard carbon negative electrode material of a sodium ion battery. Background In the technical field of sodium ion batteries, the method mainly comprises different scenes such as start-stop, energy storage, low temperature and power according to application requirements. The industrial chain is provided with a hard carbon material producer at the upstream, and hard carbon products with different performance characteristics are produced through material design and process control, and basic parameters such as specific surface area, particle size distribution and the like are provided at the factory, and then the basic parameters are supplied to a downstream cell manufacturer. However, conventional parameters provided by hard carbon manufacturers cannot directly correspond to specific application requirements. When the hard carbon material is led into different applications, the battery cell manufacturer usually needs to perform comprehensive performance test on the material, and then performs a plurality of links such as experimental verification, ton-level amplification, downstream leading-in, production line adaptation and the like. This process is not only time consuming and labor intensive, but also often requires repeated verification and introduction processes once the material is not satisfactory or the direction of the end application is adjusted, resulting in significant resource and time consumption. Disclosure of Invention Aiming at the defects of the prior art, the application aims to provide a rapid matching method for application scenes of hard carbon cathode materials of sodium ion batteries, and aims to solve the technical problem that a great deal of time and effort are required to be consumed in the prior art to match proper application scenes for the hard carbon materials. In order to achieve the above purpose, in a first aspect, the present application provides a method for rapidly matching application scenarios of hard carbon anode materials of sodium ion batteries, comprising the following steps: (1) Carrying out physical property test on a given hard carbon material to obtain specific surface area, particle size distribution, micropore volume and total pore volume of the hard carbon material; (2) And according to the test result, carrying out application scene suitability judgment according to the following conditions: If the specific surface area of the hard carbon material is 3 m 2/g to 9 m 2/g, the maximum particle diameter Dmax is less than or equal to 35 mu m, the median particle diameter D50 is 3 mu m to 8 mu m, and the micropore volume is 0.0015 cm3/g to 0.003 cm 3/g, judging that the hard carbon material is suitable for start-stop and low-temperature application scenes; If the specific surface area of the hard carbon material is 1m 2/g to 5m 2/g, the maximum particle diameter Dmax is less than or equal to 35 mu m, the median particle diameter D50 is 4 mu m to 9 mu m, and the total pore volume is 0.008 cm 3/g to 0.015 cm 3/g, the material is judged to be suitable for high-energy density application scenes; If the hard carbon material meets the two sets of conditions, judging that the hard carbon material can be simultaneously adapted to start and stop, low-temperature application scenes and high-energy-density application scenes; If the hard carbon material does not meet any one set of conditions, the hard carbon material is judged to be unsuitable for the two typical application scenarios defined by the method. Preferably, the method is suitable for start-stop and low-temperature application scenes, and represents that the hard carbon material meets the following requirements in performance test: (1) The multiplying power and the circulation performance are that when the battery cell is tested in a 2Ah soft package battery cell, the battery cell is circulated for not less than 500 times at the multiplying power of 5C without sodium precipitation, and the capacity retention rate is not less than 80% after the battery cell is circulated for not less than 1000 times at the multiplying power of 5C under the normal temperature condition; (2) Low temperature cycle performance, when tested in a 2Ah soft pack cell, the capacity retention rate was 90% or greater after 100 cycles at 0.1C rate in a-10 ℃ environment, and (3) First coulombic efficiency when half cells are made and tested, the first coulombic efficiency is greater than or equal to 85%. Preferably, the application scenario for high energy density indicates that the hard carbon material meets the following performance requirements when made into half cells and tested: (1) A first reversible specific capacity greater than or equal to 310 mAh/g, and (2) The first coulombic effi