CN101478044A - Multi-element composite positive pole material for lithium secondary battery and preparation thereof - Google Patents

Multi-element composite positive pole material for lithium secondary battery and preparation thereof Download PDF

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CN101478044A
CN101478044A CNA2009101108332A CN200910110833A CN101478044A CN 101478044 A CN101478044 A CN 101478044A CN A2009101108332 A CNA2009101108332 A CN A2009101108332A CN 200910110833 A CN200910110833 A CN 200910110833A CN 101478044 A CN101478044 A CN 101478044A
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secondary battery
positive pole
composite positive
element composite
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CN101478044B (en
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杨金洪
曾雷英
马跃飞
黄志萍
宋阜
罗小成
黄镇财
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Xiamen xiaw new energy materials Co., Ltd
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Xiamen Tungsten Co Ltd
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    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a multi-element composite positive electrode material of a Li-ion secondary battery and the preparation method thereof. The multi-element composite positive electrode material with a spherical shape, narrow particle size distribution, consistency equal to or less than 0.3 and tap density equal to or larger than 2.2 g/cm<3> is represented by a chemical formula LiNixCoyMnzO2, where x is not less than 0.5 and not larger than 1, y is not less than 0 and not larger than 0.2, z is not less than 0 and not larger than 0.3, and the summation of x, y and z is equal to 1. The preparation method comprises the following steps: controlling the crystallization and precipitation of Ni, Co and Mn salt solution to obtain Ni-Mn-Co precipitate with narrow particle size distribution and satisfactory consistency and tap density; washing and drying to obtain a precursor; mixing the precursor with a Li compound in deionized water, and drying to obtain a mixed material; sintering the dried material, crushing and classifying to obtain a primary material; and sintering the primary material, screening and classifying to obtain the final product. The method can improve the specific capacity of the material and control the profile and the particle size of the material, thereby improving the material stability.

Description

Multi-element composite positive pole material for lithium secondary battery and preparation method thereof
Technical field
The present invention relates to inorganic functional material and high-energy battery technology, specifically, relate to positive electrode of multi-element metal oxide, lithium rechargeable battery and preparation method thereof.
Background technology
At present, along with the fast development of portable electric appts such as mobile phone, notebook computer, digital camera MP3, MP4 etc., energy market is increasing to reproducible, high power capacity, high power, long-life battery requirements amount.Lithium ion battery is the battery that voltage is the highest, energy density is maximum in the battery of practicability up to now, has good its development.
In the anode material for lithium-ion batteries of present industrialization, it is simple to possess production technology, and discharge capacity is big, and the advantage of good cycle has firmly occupied most lithium rechargeable battery market.But LiCoO 2Material also has following shortcoming: the one, and cobalt belongs to rare metal, and content is less in the earth's crust, and price is higher, and the 2nd, LiCoO 2Security performance also have defective, especially under the condition of overcharging (〉=4.2V), material unstable easily and electrolyte react, cause battery blast on fire, be unfavorable for using the field of batteries that security performance is being had relatively high expectations; LiCoO in addition 2Theoretical capacity is 274mAh/g, but actual reversible capacity is about 145mAh/g, the further raising of restriction cell capacity.Therefore seek that cheap, environmental protection, capacity are higher, the better positive electrode of security performance has the important strategic meaning to the development of lithium ion battery.
With LiCoO 2Advantages such as material is compared, and polynary positive pole material lithium manganese cobalt nickel oxygen system has the specific capacity height, and the anti-over-charging performance is good, thermal stability is outstanding and receiving much concern.In three kinds of components of material, various elements are to the difference that influences of material, the content of nickel element is relevant with the capacity of material in general, the Ni constituent content is high more, the gram volume of whole multi-element composite material system is high more, but the cycle performance of the whole material of Ni too high levels and thermal stability will descend; Cobalt Co constituent content is relevant with the layer structure growth and the conductivity of material, the Co constituent content is high more, and whole positive electrode system conductivity is high more, and the layer structure of material is good more, but the Co too high levels will increase the preparation cost of polynary positive pole material, and the thermal stability of material also can descend simultaneously; The thermal stability of the content of manganese Mn element and material is relevant in the polynary positive pole material, and the cycle performance of the high more material of Mn content is good more, and thermal stability is high more, but the Mn element is high more, will cause material capacity to reduce, and finally can be converted into unsteadiness Mn 3+, influence the cycle performance of material system.At present respectively at these characteristics of polynary positive pole material system, commodity production the good LiNi of combination property 1/3Co 1/3Mn 1/3O 2The LiNi good with stability 0.4Co 0.2Mn 0.4O 2Material.But these two kinds of materials are subjected to the restriction (discharging and recharging window 3-4.2V) in current battery market, and the gram specific capacity all and LiCoO 2Comparing does not have advantage even lower slightly, can not satisfy the demand that improves the material gram volume.
Nickelic (0.5≤Ni content≤1) ternary material be at present unique a kind of in 3-4.2V discharges and recharges window discharge capacity surpass LiCoO 2Material, its specific discharge capacity reaches as high as 190mAh/g, but because the more (Ni of variation of valence of Ni element + 2, Ni + 3, Ni + 4) ionic radius difference under each valence state particularly, cause material lattice shrinkage ratio in cyclic process bigger, thereby influence the cycle performance of material, Ni in the material in addition 3+Unstable easily and electrolyte react also be cause material cycle performance and thermal stability relatively poor main cause.At present the research of high-nickel material is mainly concentrated on and coat and above the doping means, improve the material crystals structure by doping again or coating to the ternary system material, the reaction of barrier material body and electrolyte, in the hope of improving the chemical property of material, studies show that doping at present and be coated on the cyclical stability that can improve material to a certain extent, but can not overcome the loop attenuation of material fully.The present invention is intended to start with from the improvement of the physical property of material and improves the cyclical stability and the thermal stability of material.
Summary of the invention
The object of the present invention is to provide a kind of multi-element composite positive pole material for lithium secondary battery and preparation method thereof, to overcome the defective of present polynary positive pole material capacity and stability, improve the specific capacity of material, the pattern and the particle diameter of while control material, thus reach the purpose that improves stability of material.
To achieve these goals, technical scheme of the present invention is:
A kind of multi-element composite positive pole material for lithium secondary battery, chemical formula are LiNi xCo yMn zO 2, 0.5≤x≤1,0≤y≤0.2,0≤z≤0.3, x+y+z=1, spherical in shape, particle size distribution is narrow, consistency≤0.3, tap density 〉=2.2g/cm 3(gram/cubic centimetre).
A kind of multi-element composite positive pole material for lithium secondary battery preparation method:
The first step, in ratio in the chemical formula, salting liquid with nickel, cobalt, manganese is a raw material, adopts the technology of crystallization control to be settled out shape, the narrow consistency of particle size distribution and the satisfactory Ni-Mn-Co sediment of tap density, and this sediment makes presoma through washing, drying;
Second step, in ratio in the chemical formula, together add the lithium compound of presoma and respective amount in the agitator, add deionized water simultaneously, after Liquid Phase Diffusion is evenly mixed, adopt spray-dired mode dry mixed material, mix in the crystal grain rank to guarantee two kinds of materials, and can prevent batch mixing the time to the destruction of material pattern;
In the 3rd step, material that drying is good dress burns boat goes into kiln and carries out once sinteredly, and the intact back of sintering material obtains stage material just through broken classification;
In the 4th step, the product dress that the 3rd step was obtained burns boat goes into kiln once more and carries out double sintering, double sintering is finished after material through sieve, classification acquisition finished product multi-element composite positive pole material for lithium secondary battery.
In the above-mentioned first step, crystallization control technology is in the ternary reactor of band liquid stream turbine circulation, under the protection of nitrogen or other inert gases,, to control sedimentary crystallization and grow up in the mode of batch operation as precipitation reagent with solubility alkali lye.Described solubility alkali lye is a kind of among hydroxide NaOH, KOH, the LiOH, or carbonate Na 2CO 3, NH 4HCO 3, K 2CO 3, (NH 4) 2CO 3In a kind of and ammoniacal liquor, the concentration of alkali has considerable influence to the speed of transition metal raw material precipitation and sedimentary granularity and pattern, total concentration is controlled between the 1.5-5mol/L (mol).Described coprecipitation reaction temperature is 40-70 ℃, and the mixing speed of blender is 200-600r/min (gram/minute) during reaction, and the coprecipitation reaction time is 24-48 hour, and the pH value is controlled between the 10-12.
In the above-mentioned first step, cobalt salt is cobalt nitrate Co (NO 3) 2, cobalt chloride CoCl 2Or cobaltous sulfate CoSO 4In a kind of, nickel salt is nitric acid nickel (NO 3) 2, nickel chloride NiCl 2Or nickelous sulfate NiSO 4In a kind of, manganese salt is manganese nitrate Mn (NO 3) 2, manganese chloride MnCl 2Or manganese sulfate MnSO 4In a kind of, the concentration of salting liquid is 1.0-4.0mol/L.
In above-mentioned second step, lithium compound is that the organic salt, inorganic salts of lithium is (as lithium carbonate Li 2CO 3, lithium nitrate LiNO 3) or lithium hydroxide LiOH in any one, Li and metal Ni+Mn+CO mol ratio are 1.0-1.05, the deionized water addition be solid volume 3-5 doubly, mixing time is 3-8 hour.
In above-mentioned the 3rd step, once sintered temperature is 450-600 ℃, and sintering time is 4-112 hour.
In above-mentioned the 4th step, the double sintering temperature is 700-1000 ℃, and sintering time is 6-24 hour.
After adopting such scheme, the present invention utilizes each element ratio of the polynary mixed system of optimization particularly to improve the specific capacity that the Ni constituent content improves material, adopt the means of physics to come the pattern and the particle diameter of control material simultaneously, thereby reach the purpose that improves stability of material.Selected crystallization control coprecipitation method, drying process with atomizing and two-step sintering means all are the special process of setting in order to guarantee material to obtain best pattern in the manufacture of materials process in addition.
The invention has the advantages that: in special reaction vessel, the crystallization effect of control precipitation process, can the synthesis of densified sphere, the narrow presoma product of particle size distribution, this technology can strictness be controlled the ratio of Ni, Co, three kinds of elements of Mn in addition, and guarantees that Ni, Co, three kinds of elements of Mn reach molecular level and mix.Adopt the spray-dired batch mixing means of liquid-phase mixing not only to guarantee the degree that mixes of Li compound and presoma, also avoided the presoma pattern to be damaged simultaneously.Adopt the mode of double sintering, in sintering process by the maximum fine powder content in the control material of multiple fractionation, improve the homogeneity that material particle size distributes, can also improve the structure cell of material in addition and grow, guaranteed that material possesses good physics and chemical property.
Description of drawings
Fig. 1 is the LiNi that the embodiment of the invention 1 provides 0.5Co 0.2Mn 0.3O 2The X diffracting spectrum of positive electrode;
Fig. 2 is the LiNi that the embodiment of the invention 1 provides 0.5Co 0.2Mn 0.3O 2The particle size distribution figure of positive electrode;
Fig. 3 is the LiNi that the embodiment of the invention 1 provides 0.5Co 0.2Mn 0.3O 2The SEM figure (Scanning electron microscope sem observation figure) of positive electrode;
Fig. 4 is the LiNi that the embodiment of the invention 1 provides 0.5Co 0.2Mn 0.3O 2The charging and discharging curve figure of positive electrode (potential region: 3-4.2V, 1C multiplying power), abscissa is charging and discharging capacity (mAh/g), ordinate is charging/discharging voltage scope (V);
Fig. 5 is the LiNi that the embodiment of the invention 1 provides 0.5Co 0.2Mn 0.3O 2Capacity-the cycle graph of positive electrode (potential region: 3-4.2V, 1C multiplying power), abscissa is a cycle-index, ordinate is discharge capacity (mAh).
Embodiment
Embodiment 1:
With Mn (NO 3) 2, Co (NO 3) 2, Ni (NO 3) 2Mn in molar ratio 2+/ Co 2+/ Ni +The mixed of=3:2:5 is dissolved in the deionized water, is made into [Mn 2++ Co 2++ Ni +] the metal ion total concentration is the mixing salt solution of 2.0mol/L, configuration concentration is the NaOH solution of 4mol/L, configuration concentration is the 6.0mol/L ammonia spirit.To mix the ternary reactor that three kinds of solution (salting liquid, NaOH solution and ammonia spirit) and stream slowly are added dropwise to the circulation of band liquid stream turbine; under the protection of nitrogen or other inert gases; control sedimentary crystallization and grow up in the mode of batch operation; control reaction temperature is 50 ℃; mixing speed is 600r/min; the pH value is 11, and the reaction time is 48 hours.The reaction finish the back with deionized water repeatedly washing reaction product to filtrate pH value be neutrality, obtained compact crystallization (tap density 〉=2.2g/cm in 12 hours through 100 ℃ of dryings again 3), spherical morphology, the presoma of granularity narrow (consistency is 0.2).
According to the metal ion mol ratio is that the ratio of Li/ (Co+Ni+Mn)=1.05 takes by weighing Li 2CO 3With nickel cobalt manganese presoma, to weigh up material and put into mixer, add deionized water simultaneously with solid material volume ratio 3:1, open paddle, mixed material behind 6 hours even batch mixings of Liquid Phase Diffusion, carries out spray drying with mixed slurry suction spray dryer, guaranteeing that two kinds of materials mix in the crystal grain rank, and can prevent batch mixing the time to the destruction of material pattern.
The dried material burning boat of packing into is sent the tunnel kiln sintering to, is warmed up to 700 ℃ with 5 ℃/min, is incubated 10 hours, and cooling obtains stage material just then, with first stage material fragmentation, sieve, classification (these are ripe production technologies) obtains primary product.With the primary product burning boat of packing into once more, send tunnel kiln to and carry out double sintering, be warmed up to 950 ℃, be incubated 15 hours with 5 ℃/min, cooling obtains the double sintering product then, the double sintering product through sieve, classification obtains the prepared multi-element composite positive pole material for lithium secondary battery of the present invention.
Adopt U.S.'s thermoelectricity (Thermo Elemental U.S.A) inductively coupled plasma atomic emission to measure the content of metal ion in the product, determine that it consists of LiNi 0.5Co 0.2Mn 0.3O 2X-ray diffractometer (the Cu K that adopts German Brooker company to produce aRadiation, λ=1.5406) characterize product structure, its XRD test result as shown in Figure 1, product is the single a-NaFeO of crystalline phase 2Structure LiNi 0.5Co 0.2Mn 0.3O 2, layer structure material is usually with R=(I 006+ I 102)/I 101Come the chemical property of exosyndrome material, generally speaking the performance of the electrical property of the more little material of R value is good more, and embodiment 1 prepared product R=0.3995 is less relatively as calculated.The particle size distribution that adopts Britain Ma Erwen laser particle size distribution instrument to test product, test result as shown in Figure 2, particle size distribution is very narrow, consistency is 0.2.The pattern of material that adopted the FDAC scanning electron microscope test, the result as shown in Figure 3, material granule is a regular spherical, D Min〉=4 μ m (micron) do not have fine powder and other small chips to exist.
Performance for the anode material for lithium-ion batteries of testing present embodiment preparation.Get 91 parts of the products of present embodiment preparation, conductive agent Super P:2.5 part and KS-6:2.5 part, Kynoar PVDF:4 part adds makes slurry after an amount of N-methyl pyrrolidone mixes, make pole piece through the coating machine coating, in argon circulation glove box, their same diaphragm papers, charcoal negative pole and electrolyte are assembled into Experimental cell then, its charge/discharge capacity of test and cycle performance on new prestige cell tester, its Electrochemical results such as Fig. 4, shown in Figure 5.Test result: products therefrom is in the 3-4.2V interval, and 1C discharges and recharges, current density 150mA/cm 2, reversible specific capacity is 158.3mAh/g first, 100 times circulation back capability retention is that 97.2%, 300 circulation volume conservation rate is 96.1%.
Embodiment 2:
With Mn (NO 3) 2, Co (NO 3) 2, Ni (NO 3) 2Mn in molar ratio 2+/ Co 2+/ Ni +The mixed of=2:2:6 in dissolving and the deionized water, is made into [Mn 2++ Co 2++ Ni +] the metal ion total concentration is the mixing salt solution of 1.5mol/L, configuration concentration is the NaOH solution of 3mol/L, configuration concentration is the 5mol/L ammonia spirit.Three kinds of solution and stream slowly are added dropwise to the ternary reactor that band liquid stream turbine circulates; under the protection of nitrogen or other inert gases; control sedimentary crystallization and grow up in the mode of batch operation; control reaction temperature is 60 ℃; mixing speed is 400r/min; the pH value is 11.5, and the reaction time is 36 hours.The reaction finish the back with deionized water repeatedly washing reaction product to filtrate pH value be neutrality, obtained compact crystallization in 12 hours through 100 ℃ of dryings again, spherical morphology, the presoma that particle size distribution is good.
Batch mixing-drying process is with embodiment 1, do not do at this and gives unnecessary details.
The dried material burning boat of packing into is sent the tunnel kiln sintering to, is warmed up to 600 ℃ with 5 ℃/min, is incubated 10 hours, and cooling obtains stage material just then, with first stage material fragmentation, sieve, classification obtains primary product.With the primary product burning boat of packing into once more, send tunnel kiln to and carry out double sintering, be warmed up to 900 ℃, be incubated 15 hours with 5 ℃/min, cooling obtains the double sintering product then, the double sintering product through sieve, classification obtains the prepared multi-element composite positive pole material for lithium secondary battery of the present invention.
Detection means is with embodiment 1: the present embodiment product is the a-NaFeO of single crystalline phase through XRD test product 2, R=0.4124; Detect through inductively coupled plasma atomic emission spectrometer ICP-AES, determine that it consists of LiNi 0.6Co 0.2Mn 0.2O 2Through the laser particle analyzer analysis, the particle size distribution consistency is 0.2; Through sem analysis, material granule is regular spherical, no fine particle and chip; Material discharges and recharges in the 3-4.2V interval, current density 150mA/cm 2, reversible specific capacity is 165.5mAh/g first, 100 times circulation back capability retention is that 95.8%, 300 circulation volume conservation rate is 91.6%.
Embodiment 3
With Mn (NO 3) 2, Co (NO 3) 2, Ni (NO 3) 2Mn in molar ratio 2+/ Co 2+/ Ni +The mixed of=2:1:7 in dissolving and the deionized water, is made into [Mn 2++ Co 2++ Ni +] the metal ion total concentration is the mixing salt solution of 1.8mol/L, configuration concentration is the NaOH solution of 2.5mol/L, configuration concentration is the 5mol/L ammonia spirit.Three kinds of solution and stream slowly are added dropwise to the ternary reactor that band liquid stream turbine circulates; under the protection of nitrogen or other inert gases; control sedimentary crystallization and grow up in the mode of batch operation; control reaction temperature is 60 ℃; mixing speed is 300r/min; the pH value is 11, and the reaction time is 36 hours.The reaction finish the back with deionized water repeatedly washing reaction product to filtrate pH value be neutrality, obtained compact crystallization in 12 hours through 100 ℃ of dryings again, spherical morphology, the presoma that particle size distribution is good.
Batch mixing-drying process is with embodiment 1, do not do at this and gives unnecessary details.
The dried material burning boat of packing into is sent the tunnel kiln sintering to, is warmed up to 450 ℃ with 5 ℃/min, is incubated 10 hours, and cooling obtains stage material just then, with first stage material fragmentation, sieve, classification obtains primary product.With the primary product burning boat of packing into once more, send tunnel kiln to and carry out double sintering, be warmed up to 800 ℃, be incubated 20 hours with 5 ℃/min, cooling obtains the double sintering product then, the double sintering product through sieve, classification obtains the prepared lithium rechargeable battery composite positive pole of the present invention.
Detection means is with embodiment 1, and the present embodiment product is the a-NaFeO of single crystalline phase through XRD test product 2, R=0.4286; Detect through ICP-AES, determine that it consists of LiNi 0.7Co 0.1Mn 0.2O 2Through the laser particle analyzer analysis, the particle size distribution consistency is 0.2; Through sem analysis, material granule is regular spherical, no fine particle and chip; Material discharges and recharges in the 3-4.2V interval, current density 150mA/cm 2, reversible specific capacity is 178.9mAh/g first, 100 times circulation back capability retention is that 94.5%, 300 circulation volume conservation rate is 89.2%.
Comparative Examples 1
Except settling apparatus being changed into the common response still, other experimental procedures are with embodiment 1.Experiment shows: precipitation is finished disposed slurry and is gluey, is difficult to washing and separates, and adopts sem analysis in addition, is precipitated as irregular reunion shape particle, and the particle size distribution consistency is very poor.The final products electric performance test is the result show, material discharges and recharges in the 3-4.2V interval, current density 150mA/cm 2, reversible specific capacity is 148.7mAh/g first, 100 times circulation back capability retention is that 84.5%, 300 circulation volume conservation rate is 72.1%.
Comparative Examples 2
It is medium that presoma and lithium compound hybrid mode are changed into alcohol, stirring ball-milling 2 hours, and bake drying, all the other steps are with embodiment 1.Experiment shows, because the mechanical milling process ball has than the havoc effect granular precursor, is destroyed through the spherical morphology of sem analysis material, has more chip and particulate to mix and is attached to particle gap and particle surface, and the particle size distribution consistency is relatively poor.The final products electric performance test is the result show, material discharges and recharges in the 3-4.2V interval, current density 150mA/cm 2, reversible specific capacity is 153.6mAh/g first, 100 times circulation back capability retention is that 92.6%, 300 circulation volume conservation rate is 86.6%.
Comparative Examples 3
Precipitation and mixing procedure are with embodiment 1, and sintering process changes into, is warmed up to 900 ℃ with 5 ℃/min, is incubated 20 hours, cooling then, and material sieves, classification obtains product.Experiment shows that raw meal particle size distribution and pattern are slightly poor than embodiment 1 product, and there are some chips in the product particle surface.Through XRD test product is the a-NaFeO of single crystalline phase 2But, R value more greatly 0.4546; The final products electric performance test is the result show, material discharges and recharges in the 3-4.2V interval, current density 150mA/cm 2, reversible specific capacity is 143mAh/g first, 100 times circulation back capability retention is that 93.5%, 300 circulation volume conservation rate is 85.6%.
With chemical composition, the electro-chemical test condition of the foregoing description and Comparative Examples, discharge capacity, 100 circulation volume conservation rates, 300 circulation volume conservation rates are listed as follows first:
The composition of table 1 electrode material and chemical property
The sample title Chemical composition The electro-chemical test condition Discharge capacity (mAh/g) first 100 circulation volumes keep (%) 300 circulation volumes keep (%)
Embodiment 1 LiNi 0.5Co 0.2Mn 0.3O 2 3-4.2V， 1C 158.3 97.2 96.1
Embodiment 2 LiNi 0.6Co 0.2Mn 0.2O 2 3-4.2V， 1C 165.5 95.8 91.6
Embodiment 3 LiNi 0.7Co 0.1Mn 0.2O 2 3-4.2V， 1C 178.9 94.5 89.2
Comparative Examples 1 LiNi 0.5Co 0.2Mn 0.3O 2 3-4.2V， 1C 148.7 84.5 72.1
Comparative Examples 2 LiNi 0.5Co 0.2Mn 0.3O 2 3-4.2V， 1C 153.6 92.6 86.6
Comparative Examples 3 LiNi 0.5Co 0.2Mn 0.3O 2 3-4.2V， 1C 143 93.5 85.6
As seen from the above table, material specific capacity height provided by the invention and good stability.By improvement, the optimization of the present invention to ternary material pattern and composition, obviously improved the reversible capacity of ternary material, overcome the relaxation phenomenon of material capacity in cyclic process simultaneously, obviously improve the cycle life of material.

Claims (9)

1, a kind of multi-element composite positive pole material for lithium secondary battery is characterized in that: chemical formula is LiNi xCoyMn zO 2, 0.5≤x≤1,0≤y≤0.2,0≤z≤0.3 wherein, x+y+z=1, spherical in shape, particle size distribution is narrow, consistency≤0.3, tap density 〉=2.2g/cm 3
2, a kind of multi-element composite positive pole material for lithium secondary battery as claimed in claim 1 is characterized in that preparation method's step is as follows:
The first step, in ratio in the chemical formula, salting liquid with nickel, cobalt, manganese is a raw material, adopts the technology of crystallization control to be settled out shape, the narrow consistency of particle size distribution and the satisfactory Ni-Mn-Co sediment of tap density, and this sediment makes presoma through washing, drying;
Second step in ratio in the chemical formula, together added the lithium compound of presoma and respective amount in the agitator, added deionized water simultaneously, evenly after the mixing, adopted spray-dired mode dry mixed material through Liquid Phase Diffusion;
In the 3rd step, material that drying is good dress burns boat goes into kiln and carries out once sinteredly, and the intact back of sintering material obtains stage material just through broken classification;
In the 4th step, the product dress that the 3rd step was obtained burns boat goes into kiln once more and carries out double sintering, double sintering is finished after material through sieve, classification acquisition finished product multi-element composite positive pole material for lithium secondary battery.
3, a kind of multi-element composite positive pole material for lithium secondary battery as claimed in claim 2; it is characterized in that in preparation method's the first step; crystallization control technology is; in the ternary reactor of band liquid stream turbine circulation; under the protection of nitrogen or other inert gas;, control sedimentary crystallization and grow up as precipitation reagent with solubility alkali lye in the mode of batch operation.
4, a kind of multi-element composite positive pole material for lithium secondary battery as claimed in claim 3 is characterized in that in preparation method's the first step, and solubility alkali lye is a kind of among hydroxide NaOH, KOH, the LiOH, or carbonate Na 2CO 3, NH 4HCO 3, K 2CO 3, (NH 4) 2CO 3In a kind of and ammoniacal liquor, the total concentration of alkali is controlled between the 1.5-5mol/L.
5, a kind of multi-element composite positive pole material for lithium secondary battery as claimed in claim 2, it is characterized in that in preparation method's the first step, the coprecipitation reaction temperature is 40-70 ℃, the mixing speed of blender is 200-600r/min during reaction, the coprecipitation reaction time is 24-48 hour, and the pH value is controlled between the 10-12.
6, a kind of multi-element composite positive pole material for lithium secondary battery as claimed in claim 2 is characterized in that in preparation method's the first step, and cobalt salt is cobalt nitrate Co (NO 3) 2, cobalt chloride CoCl 2Or cobaltous sulfate CoSO 4In a kind of, nickel salt is nitric acid nickel (NO 3) 2, nickel chloride NiCl 2Or nickelous sulfate NiSO 4In a kind of, manganese salt is manganese nitrate Mn (NO 3) 2, manganese chloride MnCl 2Or manganese sulfate MnSO 4In a kind of, the concentration of salting liquid is 1.0-4.0mol/L.
7, a kind of multi-element composite positive pole material for lithium secondary battery as claimed in claim 2, it is characterized in that in preparation method's second step, lithium compound is any one among organic salt, inorganic salts or the lithium hydroxide LiOH of lithium, Li and metal Ni+Mn+CO mol ratio are 1.0-1.05, the water addition is 3-5 a times of solid volume, and mixing time is 3-8 hour.
8, a kind of multi-element composite positive pole material for lithium secondary battery as claimed in claim 2 is characterized in that once sintered temperature is 450-600 ℃ in preparation method's the 3rd step, and sintering time is 4-112 hour.
9, a kind of multi-element composite positive pole material for lithium secondary battery as claimed in claim 2 is characterized in that the double sintering temperature is 700-1000 ℃ in preparation method's the 4th step, and sintering time is 6-24 hour.
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