CN114180547A - Preparation method of low-cost high-power lithium iron phosphate - Google Patents

Preparation method of low-cost high-power lithium iron phosphate Download PDF

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CN114180547A
CN114180547A CN202111661954.3A CN202111661954A CN114180547A CN 114180547 A CN114180547 A CN 114180547A CN 202111661954 A CN202111661954 A CN 202111661954A CN 114180547 A CN114180547 A CN 114180547A
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iron phosphate
lithium iron
lithium
preparation
source
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王张健
席小兵
毛彦勇
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Changzhou Liyuan New Energy Technology Co ltd
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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
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/45—Phosphates containing plural metal, or metal and ammonium
    • 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
    • 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
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite

Abstract

The application relates to the field of lithium battery anode materials, and particularly discloses a preparation method of low-cost high-power lithium iron phosphate. The preparation method of the low-cost high-power lithium iron phosphate comprises the following preparation steps: s1, preparing a mixed precursor: taking a trivalent ferric salt to react with a phosphorus source, adjusting the pH, adding a lithium source and a carbon source, and collecting to obtain a mixed precursor; s2, sintering and forming: and (3) placing the mixed precursor in a protective atmosphere, and heating and sintering to obtain the high-power lithium iron phosphate. This application has optimized lithium iron phosphate preparation step and order, through reacting iron oxide with phosphoric acid earlier the back, directly mix and one step sintering with lithium source and carbon source again, can effectively solve the problem that the cost that appears in the traditional scheme preparation process risees, simultaneously, the lithium iron phosphate material of this application preparation has higher power, can not only improve the performance of lithium iron phosphate material, can also effectively reduce the cost of production lithium iron phosphate material.

Description

Preparation method of low-cost high-power lithium iron phosphate
Technical Field
The application relates to the field of lithium battery anode materials, in particular to a preparation method of low-cost high-power lithium iron phosphate.
Background
The lithium iron phosphate material is a novel lithium battery anode material emerging under the requirement of a power automobile, and has become the most potential anode material in lithium batteries. At present, the preparation process of lithium iron phosphate is mature day by day, but the defects of high raw material cost, environmental pollution in the preparation process, complex preparation process, insufficient product performance and the like still exist. The lithium iron phosphate has excellent use performance, but the low intrinsic conductivity greatly limits the use of the lithium iron phosphate, because the low conductivity can cause the charge and discharge capacity of the battery to be attenuated after a plurality of times in the charge and discharge processes of the battery. At present, by the scheme of coating the carbon material on the surface of the lithium iron phosphate material, the conductivity can be improved to a certain extent, and the manufacturing cost can be effectively reduced.
In the traditional scheme, ferric oxide, phosphoric acid or ammonium dihydrogen phosphate, lithium carbonate or lithium phosphate and carbon are mixed to prepare a lithium iron phosphate material, but because the viscosity of the high-concentration phosphoric acid material is high, dry particles are easily adhered to an inner wall layer of a preparation device in the spray drying process, so that the large-scale production of the material cannot be realized; in the scheme of replacing phosphoric acid with the ammonium dihydrogen phosphate material, ammonia gas generated in the preparation process of the ammonium dihydrogen phosphate material needs to be treated, so that the preparation cost is further increased.
In view of the above-mentioned related technologies, the inventors believe that in the current lithium iron phosphate preparation scheme, the traditional mixed preparation has high cost and complex steps, and requires repeated steps such as filtering and drying, and the phenomenon that each material adheres to the inner wall surface of the reaction equipment is likely to occur, thereby reducing the performance of the prepared lithium iron phosphate material.
Disclosure of Invention
In order to overcome the defects of complex preparation process and unstable performance of the existing lithium iron phosphate, the application provides a preparation method of low-cost high-power lithium iron phosphate.
In a first aspect, the present application provides a method for preparing low-cost high-power lithium iron phosphate, which adopts the following technical scheme:
a preparation method of low-cost high-power lithium iron phosphate comprises the following preparation steps:
s1, preparing a mixed precursor: taking a trivalent ferric salt to react with a phosphorus source, adjusting the pH, adding a lithium source and a carbon source, and collecting to obtain a mixed precursor;
s2, sintering and forming: and (3) placing the mixed precursor in a protective atmosphere, and heating and sintering to obtain the high-power lithium iron phosphate.
By adopting the technical scheme, the preparation steps and the sequence of the lithium iron phosphate are optimized, the lithium source and the carbon source are directly mixed and sintered in one step after the iron oxide and the phosphoric acid react, so that the high-power lithium iron phosphate material is prepared. Meanwhile, the lithium iron phosphate material prepared by the method has higher power, the performance of the lithium iron phosphate material can be improved, and the cost for producing the lithium iron phosphate material can be effectively reduced.
Preferably, the phosphorus source of step S1 comprises phosphoric acid.
Through adopting above-mentioned technical scheme, this application can carry out reasonable screening to the phosphorus source according to actual need, on the one hand, directly adopts the scheme of one step of preparation behind the phosphoric acid, can effectively improve and chooseed for use the problem that the wall sticking phenomenon appears in phosphoric acid preparation lithium iron phosphate material. Meanwhile, according to the technical scheme, phosphoric acid is used as a phosphorus source according to actual needs, and the problem that generated ammonia needs to be treated in the generation process of an ammonium phosphate material can be solved, so that the uniformity of particles of a prepared material sample is improved, the prepared material has a relatively stable structure, and the cycle performance and the rate capability are high.
Preferably, the lithium source in step S1 includes one or more of lithium hydroxide and lithium carbonate.
By adopting the technical scheme, the material of the lithium source is further optimized, and a proper preparation scheme can be selected in the preparation process, so that the material performance is effectively improved, and the production cost is reduced.
Preferably, the preparation of the mixed precursor in step S1 further includes the following steps:
s11, taking a trivalent ferric salt to react with a phosphorus source, stirring and mixing, and adjusting the pH value to 0.1-3.0;
and S12, after the pH is adjusted, dropwise adding a hydrogen peroxide solution while stirring, heating, and carrying out heat preservation reaction to obtain the ferric phosphate dihydrate precursor.
By adopting the technical scheme, the preparation steps of the ferric phosphate dihydrate precursor are further optimized, the hydrogen peroxide material is added in the preparation steps and is subjected to modification treatment, and the hydrogen peroxide material is added in the scheme for preparing the ferric phosphate dihydrate precursor, so that the ferric phosphate dihydrate particles with small particle size and uniform particle size can be obtained, and the structural performance of the prepared ferric phosphate dihydrate material is improved.
Preferably, the reaction temperature of the heat preservation in the step S12 is 65-95 ℃.
By adopting the technical scheme, the reaction temperature of the precursor is controlled in the process of preparing the ferric phosphate dihydrate precursor, and when the reaction temperature is 65-95 ℃, the particle size of the ferric phosphate dihydrate precursor is the minimum, the particle size distribution range is concentrated, and the particles are uniformly distributed. Since the temperature has a significant influence not only on the iron phosphate synthesis rate but also on the iron phosphate grain formation and growth. When the reaction temperature is low, the iron phosphate crystal grains in the solution are formed at a low speed, and the formed crystal grains are easy to grow, so that the synthesized iron phosphate has a large grain size. When the reaction temperature is too high, the nucleation speed of the iron phosphate is increased, and the crystal grains are not long enough to grow, so that the particle size of the iron phosphate is reduced. Therefore, the structural performance of the prepared ferric phosphate dihydrate precursor is further improved by optimizing the reaction temperature.
Preferably, the protective atmosphere in step S2 includes at least one of nitrogen, hydrogen, and carbon monoxide.
By adopting the technical scheme, the technical scheme of the application adopts the cooperation of the inert gas and the reducing gas as the protective gas, so that on one hand, the possibility of oxidation of the material in the reaction process is reduced, and on the other hand, the partially oxidized material is subjected to reduction treatment, and the electrochemical performance of the anode material is stably enhanced.
Preferably, the molar ratio of the ferric phosphate dihydrate precursor, the lithium carbonate and the carbon source in the step S1 is 1: 1.01-1.05: 0.01 to 0.30.
By adopting the technical scheme, the adding proportion of the ferric phosphate dihydrate precursor, the lithium carbonate and the carbon source is further optimized, so that the carbon coating layer coated on the surface of the prepared lithium iron phosphate material has proper thickness. When the carbon coating layer is thin, the coating modification effect is not obvious, the addition content is too high, the proportion of active substances can be reduced, and the excessively thick carbon coating layer can block the diffusion of lithium ions, so that the specific capacity is reduced.
According to the technical scheme, the carbon-coated structure is optimized, the carbon layer and the lithium iron phosphate material form the three-dimensional guide network body, the migration distance of lithium ions is effectively shortened, and the electrochemical performance of the anode material is improved. Meanwhile, the reasonable load of the coating layer can provide more pore structures for the lithium iron phosphate material, so that the lithium iron phosphate material is favorable for the insertion or desorption of lithium ions, and the performance stability of the anode material is improved.
Preferably, the carbon source in step S1 includes at least one of glucose, polyvinyl alcohol, citric acid, sucrose and polyethylene glycol.
By adopting the technical scheme, the carbon source coated material screening is optimized, the materials can be used as a good coating material to stably coat the lithium iron phosphate material in an actual scheme, the surface conductive effect of the matrix material is further improved, and then the carbon source can be decomposed in the sintering process of the lithium iron phosphate material, so that pores are formed on the surface of the lithium iron phosphate material, the insertion and extraction smoothness of lithium ions on the anode material is further improved, and the electronic conductivity and the ionic conductivity effect of the anode material are enhanced.
Secondly, the optimized carbon source can effectively modify the lithium iron phosphate material, and the surface activity of the lithium iron phosphate material is reduced by forming a coating film on the surface of the lithium iron phosphate material, so that after the anode material is applied to a battery, adverse reactions between the anode material and an electrolyte are reduced, but the insertion and the extraction of lithium ions are kept stable, and the electrochemical performance of the anode material is improved; and the generation of the film structure can also reduce the possibility of self-agglomeration among matrix materials, namely reduce the possibility of uneven distribution of particles in the anode material, so that the anode material obtains more uniform electrochemical effect.
Finally, through the compounding of various carbon sources and screening according to actual requirements, a two-dimensional layered structure and a membrane structure can be formed on the surface of the lithium iron phosphate material, so that a conductive network is formed through crosslinking. And the carbon coating layer can effectively refine particles of the matrix material, enhance the effect of lithium ion insertion or desorption on the anode material and enhance the lithium ion diffusion effect of the anode material.
In summary, the present application has the following beneficial effects:
firstly, the preparation steps and the sequence of the lithium iron phosphate are optimized, the ferric oxide and the phosphoric acid are reacted, and the precursor material of the ferric phosphate dihydrate is prepared by adjusting the pH value. The prepared lithium iron phosphate material has higher power due to the fact that the dihydrate iron phosphate material has smaller primary particle size, and meanwhile the preparation scheme can effectively solve the problem of cost rise in the preparation process of the traditional scheme.
Secondly, in the process of preparing the ferric phosphate dihydrate precursor, the reaction temperature is controlled, and when the reaction temperature is 65-95 ℃, the grain size of the ferric phosphate dihydrate precursor is the smallest, the grain size distribution range is concentrated, and the grains are uniformly distributed. Since the temperature has a significant influence not only on the iron phosphate synthesis rate but also on the iron phosphate grain formation and growth. When the reaction temperature is low, the iron phosphate crystal grains in the solution are formed at a low speed, and the formed crystal grains are easy to grow, so that the synthesized iron phosphate has a large grain size. When the reaction temperature is too high, the nucleation speed of the iron phosphate is increased, and the crystal grains are not long enough to grow, so that the particle size of the iron phosphate is reduced. Therefore, the structural performance of the prepared ferric phosphate dihydrate precursor is further improved by optimizing the reaction temperature.
And thirdly, the screening of materials coated by the carbon source is optimized, and the materials can be used as good coating materials to stably coat the lithium iron phosphate material in an actual scheme, so that the surface conductive effect of the matrix material is further improved, and further, the carbon source can be decomposed in the sintering process of the lithium iron phosphate material, so that pores are formed on the surface of the lithium iron phosphate material, the insertion and extraction smoothness of lithium ions on the anode material is further improved, and the electronic conductivity and the ionic conductivity effect of the anode material are enhanced.
Secondly, the optimized carbon source can effectively modify the lithium iron phosphate material, and the surface activity of the lithium iron phosphate material is reduced by forming a coating film on the surface of the lithium iron phosphate material, so that after the anode material is applied to a battery, adverse reactions between the anode material and an electrolyte are reduced, but the insertion and the extraction of lithium ions are kept stable, and the electrochemical performance of the anode material is improved; and the generation of the film structure can also reduce the possibility of self-agglomeration among matrix materials, namely reduce the possibility of uneven distribution of particles in the anode material, so that the anode material obtains more uniform electrochemical effect.
Detailed Description
The present application will be described in further detail with reference to examples.
In the embodiments of the present application, the selected materials are as follows, but not limited to:
materials: industrial lithium carbonate: the new materials science and technology limited of the Henan Hongdao, a cargo number 1684654160.
Examples
Example 1
A preparation method of low-cost high-power lithium iron phosphate comprises the following preparation steps:
s1, preparing a dihydrate ferric phosphate precursor: taking Fe firstly according to the molar ratio of 1:1.022O3Reacting with phosphoric acid, adjusting pH to 1.5 with 10% ammonia water, and adding Fe2O3Lithium carbonate and grapeThe sugar molar ratio is 1: 1.01: 0.01, adding lithium carbonate and glucose with the mass fraction of 10% into a reaction kettle, stirring, mixing and collecting to obtain a mixed precursor;
s2, sintering and forming: and (3) placing the mixed precursor in a nitrogen protective atmosphere, heating to 650 ℃, and performing heat preservation sintering to obtain the high-power lithium iron phosphate.
Example 2
A preparation method of low-cost high-power lithium iron phosphate comprises the following preparation steps:
s1, preparing a dihydrate ferric phosphate precursor: taking Fe firstly according to the molar ratio of 1:1.022O3Reacting with phosphoric acid, adjusting pH to 1.5 with 10% ammonia water, and adding Fe2O3And the molar ratio of lithium carbonate to glucose is 1: 1.03: 0.05, adding lithium carbonate and glucose with the mass fraction of 10% into the reaction kettle, stirring, mixing and collecting to obtain a mixed precursor;
s2, sintering and forming: and (3) placing the mixed precursor in a nitrogen protective atmosphere, heating to 700 ℃, and then performing heat preservation sintering to obtain the high-power lithium iron phosphate.
Example 3
A preparation method of low-cost high-power lithium iron phosphate comprises the following preparation steps:
s1, preparing a dihydrate ferric phosphate precursor: taking Fe firstly according to the molar ratio of 1:1.022O3Reacting with phosphoric acid, adjusting pH to 1.5 with 10% ammonia water, and adding Fe2O3And the molar ratio of lithium carbonate to glucose is 1: 1.05: 0.1, adding lithium carbonate and glucose with the mass fraction of 10% into a reaction kettle, stirring, mixing and collecting to obtain a mixed precursor;
s2, sintering and forming: and (3) placing the mixed precursor in a hydrogen protective atmosphere, heating to 700 ℃, and then performing heat preservation sintering to obtain the high-power lithium iron phosphate.
Example 4
A method for preparing low-cost high-power type lithium iron phosphate, which is different from example 1 in that pH is adjusted to 2.0 in step S1 in example 4.
Example 5
A method for preparing low-cost high-power type lithium iron phosphate, which is different from example 1 in that pH is adjusted to 3.0 in step S1 in example 4.
Example 6
A preparation method of low-cost high-power lithium iron phosphate comprises the following preparation steps:
s1, preparing a dihydrate ferric phosphate precursor: taking Fe firstly according to the molar ratio of 1:1.022O3Reacting with phosphoric acid, adjusting pH to 1.5 with 10% ammonia water, dripping 10% hydrogen peroxide solution while stirring after pH adjustment, controlling the dripping amount to be 2 times of the mass of phosphoric acid, dripping for 1h, heating at 65 deg.C after dripping, keeping the temperature, reacting, and adding Fe2O3And the molar ratio of lithium carbonate to glucose is 1: 1.01: 0.21, adding lithium carbonate and glucose with the mass fraction of 10% into the reaction kettle, stirring, mixing and collecting to obtain a mixed precursor;
s2, sintering and forming: and (3) placing the mixed precursor in a carbon monoxide protective atmosphere, heating to 700 ℃, and then performing heat preservation sintering to obtain the high-power lithium iron phosphate.
Example 7
A preparation method of low-cost high-power lithium iron phosphate comprises the following preparation steps:
s1, preparing a dihydrate ferric phosphate precursor: taking Fe firstly according to the molar ratio of 1:1.022O3Reacting with phosphoric acid, adjusting pH to 1.5 with 10% ammonia water, adding 10% hydrogen peroxide solution dropwise while stirring after pH adjustment is completed, controlling the dropwise addition amount to be 2 times of the mass of phosphoric acid, wherein the dropwise addition time is 1h, heating at 70 deg.C after dropwise addition is completed, keeping the temperature, reacting, and adding Fe2O3And the molar ratio of lithium carbonate to glucose is 1: 1.01: 0.21, adding lithium carbonate and glucose with the mass fraction of 10% into the reaction kettle, stirring, mixing and collecting to obtain a mixed precursor;
s2, sintering and forming: and (3) placing the mixed precursor in a nitrogen protective atmosphere, heating to 700 ℃, and then performing heat preservation sintering to obtain the high-power lithium iron phosphate.
Example 8
A preparation method of low-cost high-power lithium iron phosphate comprises the following preparation steps:
s1, preparing a dihydrate ferric phosphate precursor: taking Fe firstly according to the molar ratio of 1:1.022O3Reacting with phosphoric acid, adjusting pH to 2.0 with 10% ammonia water, adding 10% hydrogen peroxide solution dropwise while stirring after pH adjustment is completed, controlling the dropwise addition amount to be 2 times of the mass of phosphoric acid, wherein the dropwise addition time is 1h, heating at 75 deg.C after dropwise addition is completed, keeping the temperature, reacting, and adding Fe2O3And the molar ratio of lithium carbonate to glucose is 1: 1.01: 0.21, adding lithium carbonate and glucose with the mass fraction of 10% into the reaction kettle, stirring, mixing and collecting to obtain a mixed precursor;
s2, sintering and forming: and (3) placing the mixed precursor in a carbon monoxide protective atmosphere, heating to 700 ℃, and then performing heat preservation sintering to obtain the high-power lithium iron phosphate.
Comparative example
Comparative example 1
The preparation method of the low-cost high-power lithium iron phosphate is different from that of the embodiment 1 in that the following preparation scheme is adopted in the comparative example 1:
according to the mol ratio of iron oxide, phosphoric acid, lithium carbonate and glucose of 1: 1: 1.01: 0.21, stirring and mixing iron oxide, phosphoric acid, lithium carbonate and glucose, spray drying, collecting dry particles, placing the dry particles into a carbonization treatment at 200 ℃, collecting mixed particles, placing the mixed particles into a nitrogen protective atmosphere, heating to 700 ℃, and carrying out heat preservation and sintering to obtain the lithium iron phosphate.
Performance test
Preparing a battery according to GB/T33822-2017 nanometer lithium iron phosphate, and detecting the performance of the battery, wherein the detection effects are shown in the following table 1;
TABLE 1 Performance test Table
Figure DEST_PATH_IMAGE001
By combining the performance test tables of examples 1-8, comparative example 1 and table 1, the comparison can find that:
now, examples 1 to 5, examples 6 to 8 and comparative example 1 are used as comparison groups for comparison, and the specific steps are as follows:
(1) firstly, comparing the performances of the embodiments 1-5 with the comparative example 1, and as can be seen from the data in table 2, the data of the embodiments 1-5 are obviously superior to the data of the comparative example 1, which indicates that the technical scheme of the application optimizes the preparation steps and sequence of the lithium iron phosphate, the ferric oxide and the phosphoric acid are reacted at first, and the precursor material of the ferric phosphate dihydrate is prepared by adjusting the pH, and the prepared lithium iron phosphate material has higher power because the ferric phosphate dihydrate material has smaller primary particle size.
(2) Comparing the examples 6-8 with the example 1, the data of the examples 6-8 are obviously higher than the data of the example 1, and since the examples 6-8 further optimize the scheme for preparing the ferric phosphate dihydrate, the hydrogen peroxide material is added in the preparation step and is modified, and the hydrogen peroxide material is added in the scheme for preparing the ferric phosphate dihydrate precursor, the ferric phosphate dihydrate particles with small particle size and uniform particle size can be obtained, so that the structural performance of the prepared ferric phosphate dihydrate material is improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (8)

1. A preparation method of low-cost high-power lithium iron phosphate is characterized by comprising the following preparation steps:
s1, preparing a mixed precursor: taking a trivalent ferric salt to react with a phosphorus source, adjusting the pH, adding a lithium source and a carbon source, and collecting to obtain a mixed precursor;
s2, sintering and forming: and (3) placing the mixed precursor in a protective atmosphere, and heating and sintering to obtain the high-power lithium iron phosphate.
2. The method of claim 1, wherein the phosphorus source of step S1 comprises phosphoric acid.
3. The method of claim 1, wherein the lithium source in step S1 includes one or more of lithium hydroxide and lithium carbonate.
4. The method for preparing lithium iron phosphate with low cost and high power according to claim 1, wherein the step S1 is further performed by the following steps:
s11, taking a trivalent ferric salt to react with a phosphorus source, stirring and mixing, and adjusting the pH value to 0.1-3.0;
and S12, after the pH is adjusted, dropwise adding a hydrogen peroxide solution while stirring, heating, and carrying out heat preservation reaction to obtain the ferric phosphate dihydrate precursor.
5. The preparation method of the low-cost high-power lithium iron phosphate according to claim 4, wherein the reaction temperature of the step S12 is 65-95 ℃.
6. The method of claim 1, wherein the protective atmosphere in step S2 includes at least one of nitrogen, hydrogen, and carbon monoxide.
7. The method for preparing lithium iron phosphate with low cost and high power according to claim 4, wherein the molar ratio of the ferric phosphate dihydrate precursor, the lithium carbonate and the carbon source in step S1 is 1: 1.01-1.05: 0.01 to 0.3.
8. The method for preparing lithium iron phosphate with low cost and high power according to claim 1, wherein the carbon source in step S1 comprises at least one of glucose, polyvinyl alcohol, citric acid, sucrose and polyethylene glycol.
CN202111661954.3A 2021-12-31 2021-12-31 Preparation method of low-cost high-power lithium iron phosphate Pending CN114180547A (en)

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