CN103904328B - A kind of preparation method of biomass lamella material with carbon element and application thereof - Google Patents
A kind of preparation method of biomass lamella material with carbon element and application thereof Download PDFInfo
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- CN103904328B CN103904328B CN201410128202.4A CN201410128202A CN103904328B CN 103904328 B CN103904328 B CN 103904328B CN 201410128202 A CN201410128202 A CN 201410128202A CN 103904328 B CN103904328 B CN 103904328B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a kind of preparation of biomass lamella material with carbon element and the application in lithium ion battery thereof, adopt new raw material PERICARPIUM ARECAE, PERICARPIUM ARECAE is through alkali, acid solution process, and after carbonization, ball milling is prepared into biomass lamella material with carbon element, can be used as battery electrode material.The present invention selects reproducible PERICARPIUM ARECAE to be charcoal source, cheaper starting materials, wide material sources, and preparation process is simple, and obtained circulating battery good stability, capacity are large.
Description
Technical field
The invention belongs to material with carbon element preparing technical field, particularly relate to a kind of preparation method and application thereof of biomass lamella material with carbon element.
Technical background
In recent years, the non-renewable energy resources reduced gradually along with the whole world and more and more serious environmental problem, the novel high-energy chemical power source of green non-pollution has become the focus competitively developed countries in the world.Lithium ion battery, owing to having high-energy, long-life, low consumption, nuisanceless, memory-less effect and the advantage such as self discharge is little, internal resistance is little, cost performance is high, pollution is few, is widely used in the fields such as photoelectricity, information, traffic, national defense and military.
Lithium ion battery is primarily of compositions such as positive pole, negative pole and electrolyte solutions, and negative material is one of key factor determining lithium ion battery combination property quality.Because material with carbon element has that electrode potential is low, cycle efficieny is high, has extended cycle life and the advantage such as security performance is good, and become current lithium ion battery commercialization negative material, and obtain a wide range of applications.Current various material with carbon element is mainly obtained from the macromolecular compound of the mineral resources such as coal, pitch, petroleum coke and synthesis, but the significant damage owing to causing environment in the rare of mineral resources and macromolecular compound building-up process, make the development of material with carbon element and application receive a definite limitation.
Biomass carbon is by biomass (comprising stalk, branch, leaf etc.) Pintsch process, carbonization and the material with carbon element formed under anoxic conditions, there is the advantages such as raw material is easy to get, cheap, technique is simple, meet the requirement of green chemical industry, thus start in recent years to be subject to the people's attention.The present invention is that a kind of biomass lamella material with carbon element is prepared in charcoal source with PERICARPIUM ARECAE, and use it for the field such as lithium ion battery, ultracapacitor, the green being beneficial to battery industry is produced, there is important practical value and good application prospect, simultaneously by promoting the benign cycle of human lives and the Nature, be conducive to the sustainable development of biological environment.
Application number is that to disclose a kind of be raw material with peanut shell to 200910019348.4 Chinese patents " a kind of preparation method of porous carbon electrode material ", the preparation method of obtained porous carbon materials.At room temperature, with 0.2A/g constant current from open circuit voltage to 0.005V between discharge and recharge, the discharge capacity first of survey is 245mAh/g, and second time capacity attenuation is 45mAh/g, and the lower and decay of capacity rapidly, is difficult to be used as lithium ion battery negative material.It is raw material that paper " Highcapacitydisorderedcarbonsobtainedfromcoconutshellsas anodematerialsforlithiumbatteries " (JournalofAlloysandCompounds448 (2008) 141 – 147) proposes with cocoanut shell, using KOH or ZnCl2 as pore-foaming agent, when cocoanut shell/pore-foaming agent mass ratio is 1:5, ambient temperatare puts 5 days.Under nitrogen protection, sample is carbonized 1 hour at 800 DEG C and 900 DEG C, obtains carbon electrode material.But the quality of this preparation method pore-foaming agent used is 5 times of cocoanut shell quality, and standing time is long; On market, the price of potassium hydroxide is about 10,000 yuan/ton, and cost is high; And zinc chloride has excitant and corrosivity, long-term suction will cause Bronchopneumonia, and serious suction can be lethal, there is larger potential safety hazard.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of environmental protection, safety, the preparation method of preparation is simple and easy, cost is low biomass lamella material with carbon element and application thereof.
Above-mentioned purpose of the present invention is achieved by the following technical programs:
A preparation method for biomass lamella material with carbon element, adopts PERICARPIUM ARECAE as raw materials, comprises the following steps:
S1. preliminary treatment: first with deionized water PERICARPIUM ARECAE cleaned and be cut into bulk, put into the aqueous slkali of 1 ~ 2mol/L, at 70 ~ 90 DEG C, water-bath is soaked, then the dilute acid soln putting into 1 ~ 2mol/L boils to PERICARPIUM ARECAE completely bulk, then washs PERICARPIUM ARECAE final vacuum drying for standby;
S2. biomass lamella material with carbon element is prepared: the PERICARPIUM ARECAE after S1 process puts into tube type resistance furnace; carbonization 1 ~ 2 hour under nitrogen protection; after naturally cooling to room temperature, obtained material with carbon element is added ball mill ball milling 12 ~ 24 hours, cross 300 mesh sieves, obtained biomass lamella material with carbon element.
Reproducible PERICARPIUM ARECAE is selected to be charcoal source, cheaper starting materials, wide material sources.PERICARPIUM ARECAE after alkali, acid solution twice process is more bulk, contacts fully with nitrogen when high-temperature process, easy formation sheet Rotating fields after making carbonization.
Preferably, in described step S1, water-bath is soaked 9 ~ 11 hours; Washing PERICARPIUM ARECAE spends deionized water 3 ~ 5 times.
Preferably, the aqueous slkali described in step S1 is NaOH or potassium hydroxide solution.Dilute acid soln described in step S1 is watery hydrochloric acid or dilution heat of sulfuric acid.
Further, in step S1, vacuum drying temperature is 50 ~ 60 DEG C.
Further, in step S2, carburizing temperature is 850 ~ 1000 DEG C.The heating rate of carbonization in step S2 is 1 ~ 10 DEG C/min.
Described obtained biomass lamella material with carbon element prepares the preparation method of lithium ion battery, comprises the steps:
S11. electrode slice is prepared: by described biomass lamella material with carbon element, acetylene black, bonding agent in mass ratio for 85:(5 ~ 10): (5 ~ 10) size mixing film, obtained circular electric pole piece, described bonding agent is LA132 type aqueous binder, and described circular electric pole piece is Φ 10 circular electric pole piece;
S21. lithium ion battery is prepared: by circular electric pole piece obtained in step S11 under 60 DEG C of conditions after vacuumize, the assembling of button cell is carried out in the super purification glove box being full of argon gas, take metal lithium sheet as positive pole, the circular electric pole piece that step S11 obtains is negative pole, and microporous polypropylene membrane is barrier film; Electrolyte adopts containing the mixed solution of 1mol/L lithium hexafluoro phosphate, and ethylene carbonate, diethyl carbonate and methyl ethyl carbonate that described mixed solution is 1: 1: 1 by volume ratio are obtained by mixing.
Electrode prepared by the biomass lamella material with carbon element being charcoal source by PERICARPIUM ARECAE, its good cycling stability, carries out charge-discharge test under 100mA/g current density, and after circulation in 100 weeks, capacity remains on more than 200mAh/g.
Compared with prior art, beneficial effect of the present invention is as follows:
(1) select reproducible PERICARPIUM ARECAE to be charcoal source, cheaper starting materials, wide material sources, and the requirement meeting green chemical industry, formed with human lives and the Nature and circulate benignly, promote the sustainable development of biological environment;
(2) can be used as safe and reliable lithium ion battery negative material by after PERICARPIUM ARECAE alkali treatment, there is good using value;
(3) betel nut after alkali, acid solution twice process is more bulk, contacts fully with nitrogen when high-temperature process, makes the easy formation sheet Rotating fields of carbonization;
(4) good cycling stability of electrode prepared of biomass lamella material with carbon element of the present invention, charge-discharge test is carried out under 100mA/g current density, discharge capacity is 570.2mAh/g first, initial charge capacity is 235.9mAh/g, second week discharge capacity is 261.1mAh/g, after circulation in 100 weeks, capacity remains on 205.9mAh/g, and from the 2nd week, average capacitance loss rate was weekly less than 0.22%/week.
Accompanying drawing explanation
Fig. 1 is the capacity versus cycle frequency curve figure of the embodiment of the present invention 1;
Fig. 2 is the capacity versus cycle frequency curve figure of comparative example 1 of the present invention;
Fig. 3 is the capacity versus cycle frequency curve figure of comparative example 2 of the present invention;
Fig. 4 is the capacity versus cycle frequency curve figure of the embodiment of the present invention 5;
Fig. 5 is the electronic scanning video picture figure of the embodiment of the present invention 1;
Fig. 6 is the electronic scanning video picture figure of the embodiment of the present invention 5;
Fig. 7 is the electronic scanning video picture figure of PERICARPIUM ARECAE fiber prepared by the present invention.
Embodiment
Below in conjunction with Figure of description and specific embodiment the present invention made and elaborating further, but embodiment does not limit in any form the present invention.
Embodiment 1
A preparation method for biomass lamella material with carbon element, adopts PERICARPIUM ARECAE as raw materials, comprises the following steps:
S1. preliminary treatment: first by the dry PERICARPIUM ARECAE clean dry that water will market be bought, again dried PERICARPIUM ARECAE is cut into bulk, put into the sodium hydroxide solution of concentration 2mol/L, at 80 DEG C, water-bath soaks 10 hours, put into again in the watery hydrochloric acid of 2mol/L boil to PERICARPIUM ARECAE completely bulk, for subsequent use in 60 DEG C of vacuumizes after then spending deionized water 5 times;
S2. biomass lamella material with carbon element is prepared: the PERICARPIUM ARECAE after S1 process puts into tube type resistance furnace, and under nitrogen protection in 950 DEG C of carbonizations 1 hour, heating rate is 5 DEG C/min, naturally cools to room temperature.Again obtained material with carbon element is added ball mill ball milling 12 hours, cross 300 mesh sieves, obtained biomass lamella material with carbon element, is labeled as C1.
Described obtained biomass lamella material with carbon element prepares the preparation method of lithium ion battery, comprises the steps:
S11. electrode slice is prepared: by described biomass lamella material with carbon element, acetylene black, bonding agent in mass ratio for 85:7:8 sizes mixing film, obtained circular electric pole piece; Described bonding agent is LA132 type aqueous binder, and described circular electric pole piece is Φ 10 circular electric pole piece;
S21. lithium ion battery is prepared: by circular electric pole piece obtained in step S11 under 60 DEG C of conditions after vacuumize, be full of the super purification glove box (Mikrouna of argon gas, Sukei1220/750) assembling of button cell is carried out in, take metal lithium sheet as positive pole, the circular electric pole piece that step S11 obtains is negative pole, and microporous polypropylene membrane Celgard2400 is barrier film assembling CR2016 type button cell; Electrolyte adopts containing the mixed solution of 1mol/L lithium hexafluoro phosphate, and ethylene carbonate, diethyl carbonate and methyl ethyl carbonate that described mixed solution is 1: 1: 1 by volume ratio are obtained by mixing.
Embodiment 2
Concentration except sodium hydroxide solution in step S1 is except 1mol/L, and other conditions are with embodiment 1;
Embodiment 3
Concentration except watery hydrochloric acid in step S1 is except 1mol/L, and other conditions are with embodiment 1;
Embodiment 4
Except Ball-milling Time in step S2 is 18h, other conditions are with embodiment 1;
Embodiment 5
Except Ball-milling Time in step S2 is 24h, other conditions are with embodiment 1;
Comparative example 1
Concentration except sodium hydroxide solution in step S1 is except 0mol/L, and other conditions are with embodiment 1;
Comparative example 2
Concentration except sodium hydroxide solution in step S1 is except 3mol/L, and other conditions are with embodiment 1;
Comparative example 3
Concentration except watery hydrochloric acid in step S1 is except 0mol/L, and other conditions are with embodiment 1;
Comparative example 4
Concentration except watery hydrochloric acid in step S1 is except 3mol/L, and other conditions are with embodiment 1;
Comparative example 5
Except Ball-milling Time in step S2 is 11h, other conditions are with embodiment 1;
Comparative example 6
Except Ball-milling Time in step S2 is 25h, other conditions are with embodiment 1.
The test of lithium ion battery charge-discharge performance is carried out to embodiment 1 ~ 5 and comparative example 1 ~ 6:
Test condition is: under room temperature, and under 100mA/g current density, carry out charge-discharge test, voltage range is: 0.05 ~ 1.5V.Measurement result is as table 1:
Table 1
| Project | Discharge capacity/mAh/g first | Initial charge amount/mAh/g | Second time discharge capacity/mAh/g | Second time charge volume/mAh/g | Capacity/mAh/g after circulation in 100 weeks |
| Embodiment 1 | 505.8 | 200.5 | 218.9 | 198.2 | 206.8 |
| Embodiment 2 | 469.8 | 189.4 | 216.8 | 189.1 | 206.1 |
| Embodiment 3 | 483.9 | 186.2 | 211.6 | 190.8 | 204.2 |
| Embodiment 4 | 525.4 | 221.8 | 248.9 | 218.0 | 207.6 |
| Embodiment 5 | 570.2 | 235.9 | 261.1 | 230.6 | 205.9 |
| Comparative example 1 | 396.9 | 190.8 | 186.0 | 196.9 | 200.2 |
| Comparative example 2 | 426.6 | 186.0 | 205.5 | 194.0 | 200.4 |
| Comparative example 3 | 414.5 | 187.6 | 216.3 | 189.2 | 200.2 |
| Comparative example 4 | 422.7 | 195.8 | 202.9 | 194.4 | 201.7 |
| Comparative example 5 | 448.5 | 182.8 | 214.9 | 186.6 | 200.1 |
| Comparative example 6 | 510.2 | 210.2 | 209.6 | 196.8 | 200.6 |
The capacity versus cycle frequency curve figure of embodiment 1 as shown in Figure 1, as can be seen from the figure, charge-discharge test is carried out under 100mA/g current density, discharge capacity is 505.8mAh/g first, and second time discharge capacity is 218.9mAh/g, and after circulation in 100 weeks, capacity remains on 206.8mAh/g, the good cycling stability of lamella carbon electrode material is described, and capacity is higher, but initial stage irreversible capacity loss is comparatively large, and possible cause is that electrolyte occurs caused by a series of side reaction at electrode surface.
The capacity versus cycle frequency curve figure of comparative example 1 as shown in Figure 2, as can be seen from the figure, under 100mA/g current density, carry out charge-discharge test, discharge capacity is 396.9mAh/g first, second time discharge capacity is 186.0mAh/g, and after circulation in 100 weeks, capacity remains on 200.2mAh/g.Contrasted by embodiment 1 and comparative example 1, can find out that alkali treatment has a certain impact to lithium battery capacity, the material capacity without alkali treatment is obviously lower.
The capacity versus cycle frequency curve figure of comparative example 2 as shown in Figure 3, as can be seen from the figure, under 100mA/g current density, carry out charge-discharge test, discharge capacity is 426.6mAh/g first, second time discharge capacity is 205.5mAh/g, and after circulation in 100 weeks, capacity remains on 200.4mAh/g.By the contrast of comparative example 1,2 and embodiment 1,2, can find out that the concentration of NaOH has certain effect to raising capacity, when concentration is at 0 ~ 2mol/L, along with the rising of naoh concentration, the discharge capacity first of electrode material also along with increase, thus illustrates that the increase of alkaline concentration is conducive to improving the chemical property of material.When concentration is at 2 ~ 3mol/L, along with the increase of naoh concentration, the capacity of electrode material reduces, and illustrates that the too high chemical property of material that makes of alkali concn is deteriorated.Visible, the present invention gets alkali concn scope for optimum.
Can be obtained by table 1, comparative example 1 is known with comparative example 3, and the indices of comparative example 3 is all lower than embodiment 1, and visible acid treatment can improve the capacity of lithium battery.Contrasted by embodiment 1,3 and comparative example 3,4, can find when acid concentration is at 0 ~ 2mol/L, along with the rising of watery hydrochloric acid concentration, the discharge capacity first of electrode material also along with increase, thus illustrates that the increase of watery hydrochloric acid concentration is conducive to improving the chemical property of material.When acid concentration is at 2 ~ 3mol/L, along with the increase of watery hydrochloric acid concentration, the capacity of electrode material reduces, and illustrates that the too high chemical property of material that can make equally of acid concentration is deteriorated.Visible, acid concentration range that the present invention gets is for optimum.
The capacity versus cycle frequency curve figure of embodiment 5 as shown in Figure 4, as can be seen from the figure, charge-discharge test is carried out under 100mA/g current density, discharge capacity is 570.2mAh/g first, second time discharge capacity is 261.1mAh/g, and after circulation in 100 weeks, capacity remains on 205.9mAh/g, compares lamella material with carbon element obtained in embodiment 1, the discharge capacity first of this material is higher, therefore extends Ball-milling Time and has good contribution to the structure and cycle performance of improving material.
Carry out electronic scanning to embodiment 1 and embodiment 5, its electronic scanning video picture figure and SEM schemes, respectively as Fig. 5, shown in 6.
As shown in Figure 5, as can be seen from the figure, there are some strips in the material with carbon element of ball milling after 12 hours, illustrate that PERICARPIUM ARECAE material is after alkali, acid solution twice process, then high-temperature process contacts abundant carbonization with nitrogen, formation sheet Rotating fields.This little lamellar structure is conducive to the embedding of lithium ion in charge and discharge process and deviates from, but still has the existence of a bulk of lamellar structure, and size is unfavorable for more greatly lithium ion diffusion in the electrodes, thus affects the charge-discharge performance of material.
As shown in Figure 6, as can be seen from the figure, the material with carbon element of ball milling after 24 hours forms many irregular strips, compare lamella material with carbon element obtained in embodiment 1, the material Ball-milling Time that embodiment 5 obtains is longer, and material with carbon element more easily forms strip, and structure comparison is even.
Can be obtained by table 1, the indices of comparative example 5 all than embodiment Isosorbide-5-Nitrae, 5 low, visible Ball-milling Time crosses that I haven't seen you for ages affects the capacity of lithium battery, and the discharge capacity first of comparative example 6 is than embodiment 4, and 5 is low, therefore selects Ball-milling Time to be 12 ~ 24h.
Carry out electronic scanning again to the material with carbon element agate mortar grind into powder after charing in embodiment 1, its electronic scanning video picture figure as shown in Figure 7.
As shown in Figure 7, as can be seen from the figure, the diameter of the PERICARPIUM ARECAE fiber after grinding is about 14 μm, there is obvious layer structure on the surface of fiber, illustrate that PERICARPIUM ARECAE material is after alkali, acid solution twice process, fiber surface is corroded, then contacts abundant carbonization through high-temperature process with nitrogen, easily forms lamella material with carbon element.
Claims (9)
1. a preparation method for biomass lamella material with carbon element, is characterized in that, adopts PERICARPIUM ARECAE as raw materials, comprises the following steps:
S1. preliminary treatment: first with deionized water PERICARPIUM ARECAE cleaned and be cut into bulk, put into the aqueous slkali of 1 ~ 2mol/L, at 70 ~ 90 DEG C, water-bath is soaked, the dilute acid soln putting into 1 ~ 2mol/L again boils to PERICARPIUM ARECAE completely bulk, wash PERICARPIUM ARECAE final vacuum drying for standby again, described aqueous slkali is NaOH or potassium hydroxide solution;
S2. biomass lamella material with carbon element is prepared: the PERICARPIUM ARECAE after S1 process puts into tube type resistance furnace; carbonization 1 ~ 2 hour under nitrogen protection; after naturally cooling to room temperature, obtained material with carbon element is added ball mill ball milling 12 ~ 24 hours, cross 300 mesh sieves, obtained biomass lamella material with carbon element.
2. the preparation method of biomass lamella material with carbon element according to claim 1, is characterized in that, in described step S1, water-bath is soaked 9 ~ 11 hours.
3. the preparation method of biomass lamella material with carbon element according to claim 1, is characterized in that, washing PERICARPIUM ARECAE in described step S1 is spend deionized water 3 ~ 5 times.
4. the preparation method of biomass lamella material with carbon element according to claim 1, is characterized in that, the dilute acid soln described in step S1 is watery hydrochloric acid or dilution heat of sulfuric acid.
5. the preparation method of biomass lamella material with carbon element according to claim 1, is characterized in that, in step S1, vacuum drying temperature is 50 ~ 60 DEG C.
6. the preparation method of biomass lamella material with carbon element according to claim 1, is characterized in that, in step S2, carburizing temperature is 850 ~ 1000 DEG C.
7. the preparation method of biomass lamella material with carbon element according to claim 1, is characterized in that, the heating rate of carbonization in step S2 is 1 ~ 10 DEG C/min.
8. the biomass lamella material with carbon element obtained by any one of claim 1 ~ 7 prepares the preparation method of lithium ion battery, it is characterized in that, comprises the steps:
S11. electrode slice is prepared: by described biomass lamella material with carbon element, acetylene black, bonding agent in mass ratio for 85:(5 ~ 10): (5 ~ 10) size mixing film, obtained circular electric pole piece, and described bonding agent is LA132 type aqueous binder;
S21. lithium ion battery is prepared: by circular electric pole piece obtained in step S11 under 60 DEG C of conditions after vacuumize, the assembling of button cell is carried out in the super purification glove box being full of argon gas, take metal lithium sheet as positive pole, the circular electric pole piece that step S11 obtains is negative pole, and microporous polypropylene membrane is barrier film; Electrolyte adopts containing the mixed solution of 1mol/L lithium hexafluoro phosphate, and ethylene carbonate, diethyl carbonate and methyl ethyl carbonate that described mixed solution is 1: 1: 1 by volume ratio are obtained by mixing.
9. prepared the lithium ion battery of gained by claim 8, it is characterized in that, after circulation in 100 weeks, capacity remains on more than 200mAh/g.
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