CN107732176A - The preparation method of nano-scale lithium ion battery anode material - Google Patents
The preparation method of nano-scale lithium ion battery anode material Download PDFInfo
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Abstract
The invention discloses a kind of preparation method of nano-scale lithium ion battery anode material.Nano-scale lithium ion battery anode material preparation method of the present invention comprises the step of：Prepare lithium ferric manganese phosphate precursor solution；Prepare conductive coating precursor solution；The lithium ferric manganese phosphate precursor solution and conductive coating precursor solution are subjected to mixed processing, form mixture solution；The mixture solution is subjected to ball milling, drying process after carrying out calcination processing in protective atmosphere.Preparation method of the present invention make it that the nano-scale lithium ion battery anode material particle diameter of generation is nanoscale, and clad is complete, and conducts electricity very well.
Description
Technical field
The invention belongs to technical field of lithium ion, and in particular to a kind of system of nano-scale lithium ion battery anode material
Preparation Method.
Background technology
In the case where global energy and environmental problem are increasingly severeer, it is main that the vehicles, which progressively use energy-storage battery instead,
Power source, lithium ion battery has high voltage, high-energy-density (including body as a kind of high performance secondary green battery
Product energy, specific energy), low self-discharge rate, wide use temperature range, the cycle life of length, environmental protection, memory-less effect
And can be with high current charge-discharge the advantages that, it is considered to be the optimal selection of high-energy, high density, high power and inexpensive battery
One of.
But it is exactly positive electrode to restrict one of industrialized bottleneck of lithium ion battery large-scale popularization, main application at present is most
Extensive positive electrode is the cobalt acid lithium (LiCoO of layer structure2), nickle cobalt lithium manganate (LiNi1-x-yCoxMnyO2), LiMn2O4
(LiMnO2), the LiMn2O4 (LiMn of spinel structure2O4) etc..But because cobalt is poisonous and resource-constrained, nickle cobalt lithium manganate cyclicity
Energy and poor safety performance, the factor such as the cycle performance of LiMn2O4 and high-temperature behavior difference, constrain their application and development.Cause
This, development of the cheap positive electrode of exploitation novel high-energy to lithium ion battery is most important.
Nano-grade lithium iron phosphate (LiFePO4) it is a kind of lithium battery anode material with olivine structural developed in recent years
Material, it has the characteristic of reversibly removal lithium embedded.Compared with traditional lithium ion secondary battery anode material, its raw material source
More extensively, price is less expensive, non-toxic, and non-environmental-pollution, especially its security performance and cycle life are other materials institutes
It can not compare.But LiFePO4Also there is material the shortcomings that can not overcoming in itself, as its voltage platform is low, generally
3.2V, cryogenic property is not so good, and energy density is low etc..
With LiFePO4With mutually isostructural LiMnPO4It is 4.1V relative to Li+/Li electrode potential, is far above
LiFePO4Voltage platform, and in the electrochemical stability window of existing electrolyte system, therefore receive much concern.However, by
In LiMnPO4Electric conductivity extreme difference, it is considered to be insulator, cause LiMnPO4Chemical property extreme difference, limit its development
Using.
Iron manganese phosphate for lithium LiFe1-xMnxPO4(0<x<1) it is in LiMnPO4Grow up on the basis of modification, although Fe2+
Introducing the electric conductivity of lithium manganese phosphate can be made to increase, but improve limited extent, it is difficult to make the chemical property of material
Give full play of.
In order to solve the defects of iron manganese phosphate for lithium poorly conductive, occur at present using electric conductivity clad cladding manganese phosphate
Iron lithium, to realize the electric conductivity for improving iron manganese phosphate for lithium, such as presently disclosed reaction in-situ prepares graphene coated phosphoric acid ferrimanganic
In the preparation method of lithium anode material, it first prepares MnPO using manganese source and phosphorus source4·H2O nano powders, then by source of iron and phosphorus source system
Standby FePO4·2H2O nano powders, then by MnPO4·H2O nano powders, FePO4·2H2O nano powders surpass with graphene oxide solution
Sound disperses, and lithium source mixing is then added dropwise, dries the lithium ferric manganese phosphate material that graphene coated is obtained with sintering processes, but through grinding
Study carefully discovery, the lithium ferric manganese phosphate positive electrode of existing conductive layer cladding still has that clad clad ratio is low, and electric conductivity improves
It is limited and cause chemical property undesirable.
The content of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art, there is provided a kind of nano-scale lithium ion battery anode material
The preparation method of material.With low, the undesirable skill of chemical property that solves the lithium ferric manganese phosphate material clad ratio of existing clad structure
Art problem.
In order to realize foregoing invention purpose, one aspect of the present invention, there is provided a kind of nano-scale lithium ion battery anode material
Preparation method.The preparation method of the nano-scale lithium ion battery anode material comprises the following steps：
Prepare lithium ferric manganese phosphate precursor solution；
Prepare conductive coating precursor solution；
The lithium ferric manganese phosphate precursor solution and conductive coating precursor solution are subjected to mixed processing, form mixing
Thing solution；
The mixture solution is subjected to ball milling, drying process after carrying out calcination processing in protective atmosphere；
Wherein, auxiliary agent, the auxiliary agent molar content and the phosphoric acid are also contained in the lithium ferric manganese phosphate precursor solution
The ratio between ferrimanganic lithium presoma total moles content is 1：(0.1-10).
Compared with prior art, the present invention mainly has following technique effect：
One, is by by conductive coating precursor solution in-stiu coating lithium ferric manganese phosphate, on the one hand, in calcination processing,
The conductive coating precursor solution clad persursor material is sintered to form coating layer material, and is uniformly coated on and forges
The surface of the lithium ferric manganese phosphate primary particle of processing generation is burnt, the growth of lithium ferric manganese phosphate particle diameter can be suppressed so that generation
Nano-scale lithium ion battery anode material particle diameter is nanoscale, the migration path of lithium ion and electronics is thus shortened, so as to carry
The high electric conductivity of material；On the other hand, clad is because with to conductive characteristic, therefore, it can also be in lithium ferric manganese phosphate
The surface of second particle forms uniform conductive network, effectively increases the electric conductivity of lithium ferric manganese phosphate；
2nd, the auxiliary agent added in lithium ferric manganese phosphate precursor solution can not only realize that the coordination with metal ion is made
With so that each metal ion is dispersed in atomic level；Meanwhile auxiliary agent is gone back in addition to causing metal ion dispersed
Carbon source can be played a part of, together with conductive coating precursor solution other clad source materials, suppressing lithium ferric manganese phosphate
Outside primary particle growth, moreover it is possible to the integrality of lithium ferric manganese phosphate particles coat is improved, so that the lithium ferric manganese phosphate prepared
Possess excellent performance.
In addition, preparation method process conditions of the present invention are easily-controllable, the nano-scale lithium ion battery anode material structure of preparation and
Stable electrochemical property.
Brief description of the drawings
Fig. 1 is the process chart of nano-scale lithium ion battery anode material preparation method of the embodiment of the present invention；
Fig. 2 is the electron-microscope scanning picture of nano-scale lithium ion battery anode material of the embodiment of the present invention, wherein, figure A is real
The electron microscope of the nano-scale lithium ion battery anode material of the preparation of example 1 is applied, figure B is nano-scale lithium ion electricity prepared by comparative example 1
The electron microscope of pond positive electrode；
Fig. 3 is nano-scale lithium ion battery anode material prepared by embodiment 1 and comparative example 1 discharge curve under 0.2C
Figure；Wherein, curve 1 is the nano-scale lithium ion battery anode material of embodiment 1 discharge curve under 0.2C, and curve 2 is comparative example 1
Nano-scale lithium ion battery anode material discharge curve under 0.2C；
Fig. 4 is nano-scale lithium ion battery anode material prepared by embodiment 1 and comparative example 1 discharge curve under 1.0C
Figure；Wherein, curve 1 is the nano-scale lithium ion battery anode material of embodiment 1 discharge curve under 1.0C, and curve 2 is comparative example 1
Nano-scale lithium ion battery anode material discharge curve under 1.0C；
Fig. 5 is nano-scale lithium ion battery anode material prepared by embodiment 2 and comparative example 2 discharge curve under 0.2C
Figure；Wherein, curve 1 is the nano-scale lithium ion battery anode material of embodiment 2 discharge curve under 0.2C, and curve 2 is comparative example 2
Nano-scale lithium ion battery anode material discharge curve under 0.2C；
Fig. 6 is nano-scale lithium ion battery anode material prepared by embodiment 2 and comparative example 2 discharge curve under 1.0C
Figure；Wherein, curve 1 is the nano-scale lithium ion battery anode material of embodiment 2 discharge curve under 1.0C, and curve 2 is comparative example 2
Nano-scale lithium ion battery anode material discharge curve under 1.0C；
Fig. 7 is nano-scale lithium ion battery anode material prepared by embodiment 3 and comparative example 3 discharge curve under 0.2C
Figure；Wherein, curve 1 is the nano-scale lithium ion battery anode material of embodiment 3 discharge curve under 0.2C, and curve 2 is comparative example 2
Nano-scale lithium ion battery anode material discharge curve under 0.2C；
Fig. 8 is nano-scale lithium ion battery anode material prepared by embodiment 3 and comparative example 3 discharge curve under 1.0C
Figure；Wherein, curve 1 is the nano-scale lithium ion battery anode material of embodiment 3 discharge curve under 1.0C, and curve 2 is comparative example 2
Nano-scale lithium ion battery anode material discharge curve under 1.0C；
Fig. 9 is the multiplying power test chart of nano-scale lithium ion battery anode material prepared by embodiment 3 and comparative example 3.
Embodiment
In order that technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with
Embodiment, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only explaining
The present invention, it is not intended to limit the present invention.
The embodiment of the present invention provides a kind of preparation method of nano-scale lithium ion battery anode material.The nanoscale lithium from
The technological process of sub- cell positive material preparation method is as shown in figure 1, it comprises the following steps：
Step S01. prepares lithium ferric manganese phosphate precursor solution；
Step S02. prepares conductive coating precursor solution；
The lithium ferric manganese phosphate precursor solution and conductive coating precursor solution are carried out mixed processing by step S03.,
Form mixture solution；
The mixture solution is carried out ball milling, drying process after carrying out calcination processing in protective atmosphere by step S04..
Specifically, in above-mentioned steps S01, before lithium ferric manganese phosphate precursor solution can be according to conventional phosphoric acid ferrimanganic lithium be prepared
The method for driving liquid solution is prepared.Different from lithium ferric manganese phosphate precursor solution method is formulated conventionally, in above-mentioned steps
Auxiliary agent is added with lithium ferric manganese phosphate precursor solution in S01.In one embodiment, the lithium ferric manganese phosphate precursor solution
In also contain auxiliary agent, the ratio between the auxiliary agent molar content and the lithium ferric manganese phosphate presoma total moles content are 1：(0.1-
10)。
In further embodiment, the method for preparing the lithium ferric manganese phosphate precursor solution is as follows：
It is (0.95-1.1) by mol ratio：(0.2-0.9)：(0.95-1)：(0.1-0.8)：The lithium source of (0-0.05), iron
Source, phosphorus source, manganese source and doped chemical source are handled using the auxiliary agent.
Particularly lithium source, source of iron, phosphorus source, manganese source and doped chemical are proportionally dissolved in solvent, are configured to mix
Polymer solution；Then auxiliary agent is added into mixture solution and is well mixed, is configured to the lithium ferric manganese phosphate precursor solution.
Wherein, the auxiliary agent can be at least one of film forming agent, activating agent or dispersant.In specific embodiment
In, the auxiliary agent can select polyvinyl alcohol, polyethylene glycol, stearic acid, citric acid, malic acid, tartaric acid, oxalic acid, salicylic acid,
At least one of butanedioic acid, glycine, ethylenediamine tetra-acetic acid, sucrose, glucose.Those described auxiliary agents contain coordination function
Group, it can not only realize the coordination with metal ion so that each metal ion is dispersed in atomic level；Meanwhile should
A little auxiliary agents can also play a part of carbon source, and collaboration conductive coating precursor solution improves the complete of lithium ferric manganese phosphate particles coat
Property, so that the lithium ferric manganese phosphate prepared possesses excellent performance.In addition, those described auxiliary agents are due to that can also be used as carbon
Source, therefore, in calcining, it can play synergistic together with conductive coating precursor solution other clad source materials and make
With suppression lithium ferric manganese phosphate primary particle grows together, effectively controls the particle diameter of the anode material for lithium-ion batteries ultimately generated
For nanoscale.
The source of iron can with but not only from ferric phosphate, ferrous phosphate, ferrous pyrophosphate, ferrous carbonate, frerrous chloride,
In ferrous hydroxide, ferrous nitrate, ferrous oxalate, iron chloride, iron hydroxide, ferric nitrate, ironic citrate, di-iron trioxide extremely
Few one kind.
Phosphorus source can with but not only from phosphoric acid, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, ferric phosphate, lithium dihydrogen phosphate
At least one of.
The manganese source can with but not only from manganese dioxide, manganese sesquioxide managnic oxide, mangano-manganic oxide, manganese oxalate, manganese acetate
Or at least one of manganese nitrate.
The doped chemical source can with but not only from boron compound, cadmium compound, copper compound, magnesium compound, aluminium
At least one in compound, zinc compound, titanium compound, zirconium compounds, niobium compound, chromium compound and rare-earth compound
Kind.When containing those doped chemical sources in the lithium ferric manganese phosphate precursor solution prepared in above-mentioned steps S01 so that final system
Contain the doped chemical in standby nano-scale lithium ion battery anode material, such as containing doped chemical boron, cadmium, copper, magnesium, aluminium, zinc,
At least one of at least one of titanium, zirconium, niobium, chromium and rare earth element, preferably boron, cadmium, magnesium, aluminium.By in phosphoric acid ferrimanganic
Lithium adds those doped chemicals, to reduce the disproportionated reaction of manganese so that and the structure of the lithium ferric manganese phosphate nucleome of generation is more stable,
It is the structural stability for improving the nano-scale lithium ion battery anode material finally prepared.
In addition, the source of iron of appropriate scope is added in lithium ferric manganese phosphate precursor solution is prepared, so that at sintering
After reason, Fe2+Substitute part Mn2+Ratio, can increase cell parameter, improve the electric conductivity of lithium ferric manganese phosphate material, protect simultaneously
The lithium ferric manganese phosphate material of card generation has high voltage platform.
In the various embodiments described above, the solvent for preparing lithium ferric manganese phosphate precursor solution can be with but not just for deionization
At least one of water, distilled water, ethanol, methanol, acetone, dimethylformamide, dimethyl sulfoxide (DMSO), ethylene glycol.It is molten by those
The lithium ferric manganese phosphate precursor solution concentration that agent is prepared can be that percentage by weight is 10%-80%.
In above-mentioned steps in S02, preparing the conductive coating precursor solution can be carried out according to the method for such as lower section：
Carbon source and conductive agent are subjected to decentralized processing in solvent；Wherein, the carbon source and the weight ratio of the conductive agent
For 1：(0.01-10).
Wherein, the carbon source can be at least one of pitch, polyethylene glycol, polyvinyl alcohol, fructose, lactose, starch；
The conductive agent can be Ketjen black, acetylene carbon black, Super P, nano-carbon powder, CNT, graphite, graphene, superconduction carbon,
At least one of carbon nano-fiber.So, conductive coating precursor solution includes carbon source and conductive agent, and the carbon source exists
The carbon of formation is calcined in above-mentioned steps S04, and the surface of lithium ferric manganese phosphate primary particle can be uniformly coated on, phosphorus can be suppressed
The growth of sour ferrimanganic lithium particle diameter so that generation anode material for lithium-ion batteries particle diameter be nanoscale, thus shorten lithium ion with
The migration path of electronics, so as to improve the electric conductivity of material.Contained conductive agent can be in lithium ferric manganese phosphate second particle
Surface forms uniform conductive network, effectively increases the electric conductivity of lithium ferric manganese phosphate.
In one embodiment, the solvent for preparing conductive coating precursor solution can be with but not just for water, ethanol, third
At least one of ketone, ethylene glycol.The conductive coating precursor solution concentration prepared by those solvents can be 1%-50%.
In above-mentioned steps S03, lithium ferric manganese phosphate precursor solution and above-mentioned steps S02 that above-mentioned steps S01 is prepared are matched somebody with somebody
The mixed processing of the conductive coating precursor solution of system, can directly mix both by above-mentioned steps S04
Middle ball-milling treatment so that each component is sufficiently mixed；Using conventional hybrid mode as stirred after can also both be mixed
It is well mixed Deng two solution are caused.In one embodiment, after the mixing of two solution in the mixture solution that is formed, the carbon source and lead
The 0.5-10% of the electric reasonable opinion generation iron manganese phosphate for lithium quality of agent gross mass.By controlling the combined amount of carbon source and conductive agent, with
So that in subsequent step, clad can effectively coat the lithium ferric manganese phosphate of generation, while molten in lithium ferric manganese phosphate presoma
In liquid under contained promoter effect, the clad ratio and integrality of clad are improved.
In above-mentioned steps S04, during the mixture solution prepared in step S03 is carried out into ball-milling treatment, one side energy
Enough particle diameters for effectively reducing each component, on the other hand enable to each component fully dispersed uniformly.In one embodiment, by mixture
Solution carries out ball-milling treatment 10-48 hours.In a particular embodiment, the ball-milling treatment can with but not only in planetary ball mill
Middle carry out ball milling.
In step S04, processing is dried to the mixture solution after ball-milling treatment, is to remove mixture
Solvent in solution, such as abundant drying process will be carried out at a temperature of 80-300 DEG C of mixture solution after ball-milling treatment, it is such as dry
Dry 2~20 hours.After processing to be dried, in an embodiment, in addition to smashing processing is carried out to dried mixture, with broken
The mixture to be lumpd in drying process process.
In step S04, sintering processes make it that each component in mixture is obtained after drying process to be reacted at high temperature,
Such as lithium source, source of iron, phosphorus source, manganese source and doped chemical source component generate lithium ferric manganese phosphate positive electrode in sintering process, when
During containing doped chemical source component, the lithium ferric manganese phosphate positive electrode of doping is generated.Now, the component such as contained auxiliary agent, carbon source
Charcoal is generated in sintering process, particularly auxiliary agent and carbon source such as pitch sinter to form no amorphous carbon, effectively complete cladding
Lithium ferric manganese phosphate material granule, contained conductive agent such as Ketjen black are dispersed in lithium ferric manganese phosphate crystal grain, and in phosphoric acid ferrimanganic
Lithium surface forms uniform conductive network so that the electric conductivity of lithium ferric manganese phosphate significantly increases.
In order to improve the generation of lithium ferric manganese phosphate positive electrode, conductive coating cladding integrality is improved, in one embodiment,
It is in the condition of the calcination processing：1-15 DEG C/min of heating rate, 500-900 DEG C of temperature, calcination time 2-24 hours.
In further embodiment, after the drying process, also include to gained mixture after drying process before the calcination processing
The step of carrying out pre-sintered processing, the temperature of the pre-sintered processing is 300-500 DEG C, and the time is 2-10 hours.
Therefore, the preparation method of above-mentioned nano-scale lithium ion battery anode material is by by conductive coating precursor solution
In-stiu coating lithium ferric manganese phosphate, on the one hand, conductive coating forms uniform conductive network on lithium ferric manganese phosphate surface, effectively carries
The high electric conductivity of lithium ferric manganese phosphate；Another aspect conductive coating inhibits the growth of lithium ferric manganese phosphate particle diameter so that generation
Nano-scale lithium ion battery anode material particle diameter be nanoscale, thus shorten the migration path of lithium ion and electronics, so as to
Improve the electric conductivity of material；In addition, in the increased auxiliary agent of lithium ferric manganese phosphate precursor solution, gold is on the one hand enabled to
Category uniform ion disperses, and on the other hand can also play a part of carbon source, assists conductive coating precursor solution, improves clad
Clad ratio, improve the electric conductivity of the nano-scale lithium ion battery anode material of preparation.
And preferably using carbon source and conductive agent composition as conductive coating precursor solution so that at sintering
During reason, carbon source forms carbon coating layer together with auxiliary agent, and so as to improve the integrality of carbon coating layer, contained conductive agent is in phosphorus
Sour ferrimanganic lithium surface forms uniform conductive network so that the electric conductivity of lithium ferric manganese phosphate significantly increases.
Through measuring, the nano-scale lithium ion battery anode material prepared by the above method has nano-scale, such as exists
Below 100nm, particle is tiny, uniform, shortens Li so as to reduce nano-scale lithium ion battery anode material primary particle size aspect+With
The migration path of electronics, so as to improve the electric conductivity of material, improve the chemical property of material.In addition, the nanoscale lithium prepared
Ion battery positive electrode purity is high, discharge platform height (3.95V), has high-energy-density, good low temperature properties, good multiplying power
The positive electrode nano ferric phosphate manganese lithium of discharge performance and good circulation performance.Through measuring, nano-scale lithium ion battery anode material
The 1C electric discharge gram volumes of material discharge gram volume up to 146mAh/g up to 153mAh/g, mean voltage 3.95V, 3C.Secondly, it is above-mentioned
Preparation method preparation process condition is easily-controllable, ensure that the nano-scale lithium ion battery anode material stable performance of generation, Er Qieyuan
Expect abundance, production efficiency is high, reduces the production cost of nano-scale lithium ion battery anode material.
Preparation method based on above-mentioned nano-scale lithium ion battery anode material and the nano-scale lithium ion battery to generation
Positive electrode performance test understands that the nano-scale lithium ion battery anode material prepared using the above method is as lithium ion battery
Lithium ion battery prepared by positive electrode, lithium ion battery safety, Large Copacity, extra long life, high temperature resistant, high power discharge ability
By force, outside the advantages that quickly-chargeable, the advantages that higher energy density, more preferable cryogenic property and higher compacted density.
In conjunction with instantiation, the present invention will be described in further detail.
Embodiment 1
Present embodiments provide a kind of nano-scale lithium ion battery anode material and preparation method thereof.The present embodiment nanoscale
Anode material for lithium-ion batteries and preparation method thereof comprises the following steps：
S11:By lithium hydroxide, ferric nitrate, ammonium dihydrogen phosphate, manganese nitrate and stearic acid according to mol ratio be 1:0.4:1:
0.6:1 is configured to lithium ferric manganese phosphate precursor solution, and solvent is water, and solution concentration percentage by weight is 20%；
S12:Pitch and Ketjen black are subjected to decentralized processing in solvent and are configured to conductive coating precursor solution；Its
In, the weight ratio of the pitch and the Ketjen black is 1：0.05, solvent is water, solution concentration 5%；
S13:Electro-cladding layer presoma is prepared in lithium ferric manganese phosphate precursor solution and step S12 by being prepared in step S11
Solution is according to 20:1 is mixed, and forms mixture solution；
S14:By the mixture solution in planetary ball mill 30 hours ball millings of ball milling, forced air drying obtains at 80 DEG C
To powder, gained powder is crushed with disintegrating apparatus；Powder after crushing is placed in atmosphere furnace in 400 DEG C of Temperature pre-treatment
20 hours, nano ferric phosphate manganese lithium/pitch/Ketjen black presoma is obtained, by nano ferric phosphate manganese lithium/pitch/Ketjen black forerunner
Body is calcined 20 hours for 700 DEG C under nitrogen atmosphere protection, and heating rate is controlled at 5 DEG C/min, is obtained after natural cooling nano level
Asphaltic base amorphous carbon/Ketjen black cladding nano ferric phosphate manganese lithium.
Embodiment 2
Present embodiments provide a kind of nano-scale lithium ion battery anode material and preparation method thereof.The present embodiment nanoscale
Anode material for lithium-ion batteries and preparation method thereof comprises the following steps：
S21:By lithium nitrate, ferrous nitrate, phosphoric acid, manganese acetate and magnesium nitrate doping element compound and tartaric acid according to rubbing
You are frequently 1.05:0.2:0.98:0.78:0.02:3 are configured to lithium ferric manganese phosphate precursor solution, and solvent is water-ethanol (1:
1), solution concentration is weight percentage 80%；
S22:Pitch and Ketjen black are subjected to decentralized processing in solvent and are configured to conductive coating precursor solution；Its
In, the weight ratio of the pitch and the Ketjen black is 1：9, solvent is absolute ethyl alcohol, solution concentration 40%；
S23:Electro-cladding layer presoma is prepared in lithium ferric manganese phosphate precursor solution and step S22 by being prepared in step S21
Solution is according to 25:1 is mixed, and forms mixture solution；
S24:30 hours ball millings of ball milling, the forced air drying at 120 DEG C in planetary ball mill by the mixture solution
Powder is obtained, gained powder is crushed with disintegrating apparatus；The temperature that powder after crushing is placed in atmosphere furnace at 450 DEG C is located in advance
Reason 3 hours, obtains nano ferric phosphate manganese lithium/pitch/Ketjen black presoma, by nano ferric phosphate manganese lithium/pitch/Ketjen black forerunner
Body is calcined 12 hours for 600 DEG C under nitrogen atmosphere protection, and heating rate is controlled at 8 DEG C/min, is obtained after natural cooling nano level
Asphaltic base amorphous carbon/Ketjen black cladding nano ferric phosphate manganese lithium.
Embodiment 3
Present embodiments provide a kind of nano-scale lithium ion battery anode material and preparation method thereof.The present embodiment nanoscale
Anode material for lithium-ion batteries and preparation method thereof comprises the following steps：
S31:By lithium carbonate, di-iron trioxide, ammonium phosphate, manganese citrate and aluminum nitrate doping element compound and glucose
It is 0.98 according to weight ratio:0.59:0.98:0.4:0.01:0.8 is configured to lithium ferric manganese phosphate precursor solution, is adjusted with nitric acid
Solution PH is 3, and solvent is acetone, solution concentration 10%；
S32:Pitch and Ketjen black are subjected to decentralized processing in solvent and are configured to conductive coating precursor solution；Its
In, the weight ratio of the pitch and the Ketjen black is 1：3, solvent is ethylene glycol, solution concentration 20%；
S33:Electro-cladding layer presoma is prepared in lithium ferric manganese phosphate precursor solution and step S32 by being prepared in step S31
Solution is according to 50:1 is mixed, and forms mixture solution；
S34:30 hours ball millings of ball milling, the forced air drying at 350 DEG C in planetary ball mill by the mixture solution
Powder is obtained, gained powder is crushed with disintegrating apparatus；The temperature that powder after crushing is placed in atmosphere furnace at 450 DEG C is located in advance
Reason 3 hours, obtains nano ferric phosphate manganese lithium/pitch/Ketjen black presoma, by nano ferric phosphate manganese lithium/pitch/Ketjen black forerunner
Body is calcined 8 hours for 850 DEG C under nitrogen atmosphere protection, and heating rate is controlled at 3 DEG C/min, is obtained after natural cooling nano level
Asphaltic base amorphous carbon/Ketjen black cladding nano ferric phosphate manganese lithium.
Comparative example 1
The preparation method for the nano-scale lithium ion battery anode material that this comparative example 1 provides provides such as above-described embodiment 1
Nano-scale lithium ion battery anode material preparation method, difference is, phosphoric acid ferrimanganic is being configured in this comparative example
Auxiliary agent is not added in the step of lithium precursor solution, other holdings are constant.
Comparative example 2
The preparation method for the nano-scale lithium ion battery anode material that this comparative example 2 provides provides such as above-described embodiment 2
Nano-scale lithium ion battery anode material preparation method, difference is, phosphoric acid ferrimanganic is being configured in this comparative example
Auxiliary agent is not added in the step of lithium precursor solution, other holdings are constant.
Comparative example 3
The preparation method for the nano-scale lithium ion battery anode material that this comparative example 3 provides provides such as above-described embodiment 3
Nano-scale lithium ion battery anode material preparation method, difference is, phosphoric acid ferrimanganic is being configured in this comparative example
Auxiliary agent is not added in the step of lithium precursor solution, other holdings are constant.
Lithium ferric manganese phosphate positive electrode performance test
1. nano-scale lithium ion battery anode material particle diameter, carbon content and specific area measuring：
The nano-scale lithium ion that the nano-scale lithium ion battery anode material and comparative example that embodiment 1 to 3 is provided provide
Cell positive material carries out following dependence tests, wherein, embodiment 1 and the correlated performance such as table 1 of the positive electrode of comparative example 1 test
It is shown.In addition, the electron microscopic picture of positive electrode prepared by embodiment 1 is as shown in Figure 2 A, the positive electrode Electronic Speculum that comparative example 1 provides
Picture is as shown in Figure 2 B.
Table 1
From Fig. 1 and table 1, add that the sample particle diameter of auxiliary agent is significantly smaller, and sample size is relatively more uniform, sample particle diameter
In below 100nm, and it is obvious less to reunite；And the sample for being not added with auxiliary agent is then reunited particularly evident, and sample particle diameter is substantially inclined
Greatly；This is due to the sample that with the addition of auxiliary agent in the presence of auxiliary agent so that metal ion is dispersed in atomic level；Together
When, the auxiliary agent of addition is somewhat excessive, and excessive auxiliary agent can play a part of carbon source, assists conductive coating precursor solution,
Clad clad ratio is improved, conductive coating inhibits the growth of lithium ferric manganese phosphate particle diameter so that the nano-scale lithium ion of generation
Cell positive material particle diameter is in below 100nm.In addition, the nano-scale lithium ion battery prepared to embodiment 2,3 and comparative example 2,3
Positive electrode is carried out as the nano-scale lithium ion battery anode material progress of embodiment 1 and the preparation of comparative example 1 is identical as described above
Test, test is learnt, the ferric phosphate that lithium ferric manganese phosphate positive electrode correlated performance prepared by embodiment 2,3 is prepared with embodiment 1
Manganese lithium anode material approaches, the phosphoric acid that lithium ferric manganese phosphate positive electrode correlated performance prepared by comparative example 2,3 is prepared with comparative example 1
Ferric manganese phosphate anode material approaches.Therefore, lithium ferric manganese phosphate of embodiment of the present invention method for preparing anode material can ensure what is prepared
The lithium ferric manganese phosphate positive electrode such as correlated performance such as particle diameter, carbon content is stable.
2. the related electrochemical property test of nano-scale lithium ion battery anode material
By the lithium ferric manganese phosphate positive electrode that embodiment 1 to 3 provides and the lithium ferric manganese phosphate positive electrode that comparative example provides
Respectively as positive electrode active materials, itself and acetylene black, PVDF are pressed 90:5:After 5 mass ratio weighs, 20 points are ground in mortar
Clock is allowed to well mixed, then adds N- methyl alkanone pyrroles (NMP), then grind 20 minutes and obtain uniform black paste.Will
Black paste is uniformly coated on aluminium foil, is subsequently placed in 120 DEG C of dry 12h in vacuum drying chamber, then be punched into diameter 14mm
Disk as positive pole.By positive plate, negative plate (diameter 14.5mm metal lithium sheet), (micropores of Celgard 2400 gather barrier film
Propylene film) and electrolyte (1mo1/L LiPF6/ EC+DMC (volume ratios 1:1)) it is assembled into the glove box full of hydrogen
CR2025 type button cells, electrochemical property test will be carried out after battery standing 12h.With metal during progress electrochemical property test
Li is to electrode, charging/discharging voltage scope 2.0-4.3V, 25 DEG C of constant temperature, is carried out such as correlated performance test, test result in table 2 below
It is as shown in table 2 below.Wherein, embodiment 1 and comparative example 1 under 0.2C discharge curve as shown in figure 3, embodiment 1 exists with comparative example 1
Discharge curve is as shown in Figure 4 under 1.0C；Embodiment 2 and comparative example 2 under 0.2C discharge curve as shown in figure 5, embodiment 2 with it is right
The discharge curve under 1.0C of ratio 2 is as shown in Figure 6；Embodiment 3 and comparative example 3 under 0.2C discharge curve as shown in fig. 7, implementing
The discharge curve under 1.0C is as shown in Figure 8 with comparative example 3 for example 3.In addition, high rate performance such as Fig. 9 institutes of embodiment 3 and comparative example 3
Show.
Table 2
From test result and Fig. 3-9 in table 2, nano-scale lithium ion battery anode material provided in an embodiment of the present invention
Electric property is excellent, therefore, the electrochemical performance of its lithium ion battery prepared, and stably.
Embodiment 1-3 significantly improves than comparative example 1-3 electric discharge gram volumes it can be seen from table 2 and Fig. 3-Fig. 8, is also
The addition of auxiliary agent, the charge-discharge performance of synthesis lithium ferric manganese phosphate can be significantly improved, itself 0.2C and 1.0C mean voltage has bright
Aobvious raising, particularly 1.0C mean voltages can lift more than 0.2V.
As seen from Figure 9, the high rate performance that with the addition of the lithium ferric manganese phosphate of auxiliary agent is significantly improved, and adds auxiliary agent
Sample 3C discharges gram volume up to 146mAh/g, and the sample 3C electric discharge gram volumes for being not added with auxiliary agent are only 130mAh/g；And with
The increase of multiplying power, the sample discharge capacity decline for adding auxiliary agent is slow, and is not added with the sample of auxiliary agent then in obvious
Downward trend.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
1. a kind of preparation method of nano-scale lithium ion battery anode material, comprises the following steps：
Prepare lithium ferric manganese phosphate precursor solution；
Prepare conductive coating precursor solution；
The lithium ferric manganese phosphate precursor solution and conductive coating precursor solution are subjected to mixed processing, it is molten to form mixture
Liquid；
The mixture solution is subjected to ball milling, drying process after carrying out calcination processing in protective atmosphere；
Wherein, auxiliary agent, the molar content of the auxiliary agent and the ferric phosphate are also contained in the lithium ferric manganese phosphate precursor solution
The ratio between manganese lithium presoma total moles content is 1：(0.1-10).
2. preparation method according to claim 1, it is characterised in that：Prepare the side of the lithium ferric manganese phosphate precursor solution
Method is as follows：
It is (0.95-1.1) by mol ratio：(0.2-0.9)：(0.95-1)：(0.1-0.8)：The lithium source of (0-0.05), source of iron, phosphorus
Source, manganese source and doped chemical source are handled using the auxiliary agent.
3. preparation method according to claim 1 or 2, it is characterised in that：The auxiliary agent be polyvinyl alcohol, polyethylene glycol,
Stearic acid, citric acid, malic acid, tartaric acid, oxalic acid, salicylic acid, butanedioic acid, glycine, ethylenediamine tetra-acetic acid, sucrose, grape
At least one of sugar；And/or
The source of iron is ferric phosphate, ferrous phosphate, ferrous pyrophosphate, ferrous carbonate, frerrous chloride, ferrous hydroxide, nitric acid Asia
At least one of iron, ferrous oxalate, iron chloride, iron hydroxide, ferric nitrate, ironic citrate, di-iron trioxide；And/or
Phosphorus source is at least one of phosphoric acid, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, ferric phosphate, lithium dihydrogen phosphate；And/or
The manganese source is at least one in manganese dioxide, manganese sesquioxide managnic oxide, mangano-manganic oxide, manganese oxalate, manganese acetate or manganese nitrate
Kind；And/or
The doped chemical source is copper compound, magnesium compound, aluminium compound, zinc compound, manganese compound, titanium compound, zirconium
At least one of compound, niobium compound, chromium compound and rare-earth compound.
4. preparation method according to claim 1, it is characterised in that：Prepare the side of the conductive coating precursor solution
Method is as follows：
Carbon source and conductive agent are subjected to decentralized processing in solvent；Wherein, the weight ratio of the carbon source and the conductive agent is 1：
(0.01-10)。
5. preparation method according to claim 4, it is characterised in that：The carbon source is pitch, polyethylene glycol, polyethylene
At least one of alcohol, fructose, lactose, starch；And/or
The conductive agent be Ketjen black, acetylene carbon black, Super P, nano-carbon powder, CNT, graphite, graphene, superconduction carbon,
At least one of carbon nano-fiber.
6. according to any described preparation methods of claim 1-5, it is characterised in that：In the mixture solution, the carbon
Source and the 0.5-10% of the reasonable opinion generation iron manganese phosphate for lithium quality of conductive agent gross mass.
7. according to any described preparation methods of claim 1-5, it is characterised in that：It is in the condition of the calcination processing：Rise
Warm 1-15 DEG C/min of speed, 500-900 DEG C of temperature, calcination time 2-24 hours.
8. preparation method according to claim 7, it is characterised in that：After the drying process, the calcination processing it
Preceding also to include to the step of gained mixture carries out pre-sintered processing after drying process, the temperature of the pre-sintered processing is 300-
500 DEG C, the time is 2-10 hours.
9. according to claim 1-5,8 any described preparation methods, it is characterised in that：Prepare the nano-scale lithium ion electricity of generation
The primary particle size of pond positive electrode is below 100nm.
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| CN111559739A (en) * | 2020-03-30 | 2020-08-21 | 桑顿新能源科技有限公司 | High-rate lithium ferric manganese phosphate composite material, preparation method thereof and lithium ion battery |
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| CN114464802A (en) * | 2022-01-11 | 2022-05-10 | 中科锂电新能源有限公司 | Modified nano lithium ferric manganese phosphate cathode material and preparation method thereof |
| CN114497540A (en) * | 2022-01-26 | 2022-05-13 | 湖南裕能新能源电池材料股份有限公司 | Embedded lithium ferric manganese phosphate cathode material, preparation method thereof, lithium ion battery and electric equipment |
| CN115020702A (en) * | 2022-07-12 | 2022-09-06 | 东莞凯德新能源有限公司 | Lithium ion battery, positive electrode material with core-shell structure and preparation method of positive electrode material |
| CN115275170A (en) * | 2022-09-02 | 2022-11-01 | 永州昊利新材料科技有限公司 | Preparation method of cerium dioxide modified lithium manganese iron phosphate electrode material |
| CN115275170B (en) * | 2022-09-02 | 2023-06-30 | 永州昊利新材料科技有限公司 | Preparation method of cerium dioxide modified lithium iron manganese phosphate electrode material |
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| CN115548293B (en) * | 2022-09-23 | 2024-01-30 | 长沙学院 | Spherical LiMnFeVPO 4 Composite positive electrode material/C, and preparation method and application thereof |
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