CN106711445A - Composite positive electrode material of lithium ion storage battery and preparation method thereof - Google Patents
Composite positive electrode material of lithium ion storage battery and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a preparation method of a composite anode material of a lithium ion storage battery, which comprises the following steps: (1) dispersing graphene in an organic dispersing agent, adding a surfactant, and performing ultrasonic dispersion for 1-3h to obtain a graphene dispersion liquid; (2) uniformly mixing lithium carbonate, a manganese-containing compound, an iron-containing compound and a phosphorus-containing compound in an organic dispersant according to a designed chemical formula of lithium manganese iron phosphate, adding a graphene dispersion liquid into the mixture, performing ultrasonic dispersion again, stirring and heating, and obtaining a reaction precursor after all the solvent is evaporated; (3) and sintering the reaction precursor for 6-8 hours at 500-600 ℃ in a hydrogen-argon mixed atmosphere to obtain a sintered product, namely the lithium manganese iron phosphate and graphene composite cathode material. In addition, the invention also discloses a composite anode material prepared by the method and a lithium ion storage battery with the anode plate containing the composite anode material.
Description
Technical field
The invention belongs to lithium-ions battery field, it is more particularly related to a kind of high power performance
Lithium-ions battery composite positive pole and preparation method thereof, and using the composite positive pole lithium from
Sub- battery.
Background technology
So far, lithium-ions battery is widely used to consumer electronics, energy storage device, electric automobile
Deng numerous areas.With the expansion of application field, energy density, security of the people to lithium-ions battery
The requirement more and more higher of energy.Lithium ion accumulator positive electrode is always the key for improving battery energy density, meanwhile,
The high-temperature stability of positive pole has decisive role to battery safety.
At present, the conventional positive electrode of lithium-ions battery mainly includes transition metal oxide and phosphate-based
Row material, wherein, common positive electrode includes in commercial Li-ion battery：LiCoO2、LiMn2O4、
LiNi1/3Co1/3Mn1/3O2And LiFePO4。
LiFePO4Due to voltage platform and compacted density problem, the lifting of energy density is restricted, it is impossible to full
Demand of the sufficient electric automobile field to high-energy-density.
LiCoO2Because price and safety factor are mainly used in consumer electronics product, electricity is not suitable for
Electrical automobile and energy storage device.
LiMn2O4Then there is a problem of that cycle performance and high-temperature behavior are poor, it applies also restrained.
Ternary material (LiNi1/3Co1/3Mn1/3O2) combine LiCoO2And LiMn2O4Advantage, be employed
In consumer electronics product and electric automobile field.Using ternary material (LiNi1/3Co1/3Mn1/3O2) battery
When being charged to 4.2V, reversible capacity can reach 145~185mAh/g.Therefore, led in hybrid vehicle
Domain, due to being received significant attention with preferable energy density and power density.But, ternary material
(LiNi1/3Co1/3Mn1/3O2) after charging, nickel is oxidized, and the oxygen in material is easily deviate from, and causes the safety of battery
Hydraulic performance decline, and the first cycle efficieny of battery is relatively low.Because electric automobile field is wanted to cell safety characteristic
Seek very strict, current ternary material (LiNi1/3Co1/3Mn1/3O2) it is difficult to meet the safety of electric automobile application
Property require.
In ternary material (LiNi1/3Co1/3Mn1/3O2) in be mixed into a small amount of LiFePO4 and can reduce battery thermal runaway
Caloric value, so as to improve the security performance of battery.But, the potential plateau of LiFePO4 is significantly lower than three
First material (LiNi1/3Co1/3Mn1/3O2) potential plateau, therefore, ternary material (LiNi1/3Co1/3Mn1/3O2) with
The potential plateau of battery can be decreased obviously after LiFePO4 mixing, and battery capacity can also be reduced.Therefore, three
First material (LiNi1/3Co1/3Mn1/3O2Although) mix with LiFePO4 and can improve the security performance of battery,
The energy density and power-performance of battery can be had a strong impact on.
Iron manganese phosphate for lithium be LiFePO4 basis on adulterate manganese ion obtain a kind of new material, by adjust manganese/
Iron ratio can be obtained and ternary material (LiNi1/3Co1/3Mn1/3O2) the close discharge potential of current potential.But, phosphorus
Electronic conductivity of the electronic conductivity of sour ferromanganese lithium significantly lower than LiFePO4.Using iron manganese phosphate for lithium conduct
Positive electrode can substantially reduce the peak power of battery, and influence is using the battery of iron manganese phosphate for lithium in electric automobile
Deng the application in electrokinetic cell field.
In view of this, it is a kind of with desired Safety performance, first cycle efficieny and more common phosphorus it is necessory to provide
Positive electrode of the sour more preferable lithium-ions battery of ferromanganese lithium power-performance and preparation method thereof.
The content of the invention
It is an object of the invention to：The composite positive pole and its system of a kind of iron manganese phosphate for lithium and Graphene are provided
Preparation Method, and using the lithium-ions battery of the composite positive pole.
In order to realize foregoing invention purpose, the invention provides a kind of lithium-ions battery composite positive pole
Preparation method, it is comprised the following steps：
(1) by graphene dispersion in organic dispersing agent, surfactant, ultrasonic disperse 1-3h is added to obtain
Graphene dispersing solution；
(2) according to iron manganese phosphate for lithium design chemical formula by lithium carbonate, containing manganese compound, iron containing compoundses, contain
Phosphorus compound is well mixed in organic dispersing agent, to the graphene dispersion added in mixture described in step (1)
Liquid, ultrasonic disperse and agitating heating solution, precursors are obtained after solvent all evaporates again；And
(3) by precursors in hydrogen-argon-mixed atmosphere (hydrogen=3-10vol%, argon=97-90vol%)
500~600 DEG C sinter 6-8 hours, and the sintered product of acquisition is iron manganese phosphate for lithium and grapheme composite positive electrode material.
Improved as a kind of the of preparation method of lithium-ions battery composite positive pole of the present invention, in step (1),
The organic dispersing agent is the one kind in ethanol, acetone, ethylene glycol, preferably ethanol.
Improved as a kind of the of preparation method of lithium-ions battery composite positive pole of the present invention, in step (1),
The surfactant is stearic acid or neopelex, preferably neopelex.
Improved as a kind of the of preparation method of lithium-ions battery composite positive pole of the present invention, in step (2),
Described is manganese sulfate, manganese carbonate or its combination, preferably manganese carbonate containing manganese compound.
Improved as a kind of the of preparation method of lithium-ions battery composite positive pole of the present invention, in step (2),
The iron containing compoundses are ferrous sulfate, ferrous oxalate, ferrous citrate or its combination, preferably ferrous oxalate.
Improved as a kind of the of preparation method of lithium-ions battery composite positive pole of the present invention, in step (2),
The phosphorus-containing compound is ammonium hydrogen phosphate, ammonium dihydrogen phosphate, phosphorus pentoxide or its combination.
Improved as a kind of the of preparation method of lithium-ions battery composite positive pole of the present invention, in step (2),
Lithium carbonate, the mol ratio containing manganese compound, iron containing compoundses, phosphorus-containing compound are Li:(Fe+Mn):P=1:1:1.
Improved as a kind of the of preparation method of lithium-ions battery composite positive pole of the present invention, step (3)
In iron manganese phosphate for lithium and grapheme composite positive electrode material, the percentage by weight of Graphene is 1~10%, manganese phosphate
The percentage by weight of iron lithium is 90~99%.
Improved as a kind of the of preparation method of lithium-ions battery composite positive pole of the present invention, the graphite
Alkene is Multi-layer graphite, the graphite number of plies<10.
Improved as a kind of the of preparation method of lithium-ions battery composite positive pole of the present invention, the phosphoric acid
Ferromanganese lithium is olivine structure compound, and chemical general formula is LiMnxFeyMe1-x-yPO4, wherein 0.1<x<0.9,
0.1<y<0.9, Me is doped chemical, can be Al, Mg, Ti, Ca, Zr, Mo, W, Co, Ni
In one or more.The iron manganese phosphate for lithium of olivine structural, electrical conductivity is less than 10-7S/cm is multiple with Graphene
After conjunction, the electrical conductivity of material is improved.
In order to realize foregoing invention purpose, present invention also offers a kind of lithium-ions battery composite positive pole,
It includes iron manganese phosphate for lithium and Graphene, wherein, the percentage by weight of Graphene is 1~10%, iron manganese phosphate
The percentage by weight of lithium is 90~99%.
Improved as one kind of lithium-ions battery composite positive pole of the present invention, in the composite positive pole
Also include the material of voltage platform and iron manganese phosphate for lithium overlapping material, preferably cobalt acid lithium (LiCoO2), LiMn2O4,
Ternary material (LiNi1/3Co1/3Mn1/3O2) in one kind, its weight percentage in composite positive pole
≤ 40%, preferably 10%~40%.
Additionally, present invention also offers a kind of lithium-ions battery, it includes positive plate, negative plate, interval
Barrier film between positive plate and negative plate, and nonaqueous electrolyte, wherein, containing preceding in the positive plate
State composite positive pole.
Improved as one kind of lithium-ions battery of the present invention, the positive plate dual coating anode sizing agent, just
Pole slurry includes iron manganese phosphate for lithium and grapheme composite positive electrode material, positive conductive agent, positive electrode binder and just
Pole dispersant.
Improved as one kind of lithium-ions battery of the present invention, in the anode sizing agent, solid matter component
Percentage by weight is 50-70%, wherein, the percentage by weight of composite positive pole is 90%-98%, conductive agent
Percentage by weight be 1%-5%, the percentage by weight of binding agent is 1%-5%.
Improved as one kind of lithium-ions battery of the present invention, the positive electrode binder in the anode sizing agent is poly-
Tetrafluoroethene or Kynoar, positive conductive agent are conductive carbon black (acetylene black, Super-P, Ketjen black), just
Pole dispersant is 1-METHYLPYRROLIDONE (NMP).
Improved as one kind of lithium-ions battery of the present invention, the cathode size includes negative material, negative pole
Conductive agent, negative electrode binder and negative pole dispersant.
Improved as one kind of lithium-ions battery of the present invention, the negative material is graphite, hard carbon, centre
Phase graphite carbosphere or its combination, its percentage by weight in cathode size solids fraction is 92-98%.
As lithium-ions battery of the present invention one kind improve, the negative electrode binder be butadiene-styrene rubber (SBR),
Polyacrylonitrile aqueous binders, its percentage by weight in cathode size solid matter is 1-4%.
Improved as one kind of lithium-ions battery of the present invention, the cathode conductive agent is acetylene black, conductive charcoal
Black, Ketjen black, its percentage by weight in cathode size solid matter is 1-4%.
Improved as one kind of lithium-ions battery of the present invention, the dispersant is deionized water, cathode size
Middle solid matter and deionized water ratio are=40/60-50/50.
Relative to prior art, composite positive pole of the present invention has compared with the more preferable electronic conductance of iron manganese phosphate for lithium
Rate, thus using composite positive pole of the present invention lithium-ions battery have a safety feature, head cycle efficieny it is high,
And the power-performance of more common iron manganese phosphate for lithium is more preferable.
Specific embodiment
In order that goal of the invention of the invention, technical scheme and its technique effect become apparent from, below in conjunction with reality
The present invention will be described in further detail to apply example.It should be appreciated that the embodiment described in this specification
It is intended merely to exemplarily explain and illustrate the present invention, is not intended to limit the present invention.
Embodiment 1
1. iron manganese phosphate for lithium (LiMn is prepared0.8Fe0.2PO4) and grapheme composite positive electrode material, it includes following step
Suddenly：
(1) by graphene dispersion in ethanol solution, and neopelex is added as surface-active
Agent, ultrasonic disperse 1h obtains graphene dispersing solution.
(2) by Li2CO3、MnCO3、FeC2O4And NH4H2PO40.5/0.8/0.2/1.0 mixing in molar ratio,
Ethanol dispersed with stirring is added, and adds the graphene dispersing solution for accounting for composite positive pole gross weight 5wt%, again
Ultrasonic disperse 1h, to solution agitating heating, precursors is obtained after solvent all evaporates.
(3) by precursors in hydrogen-argon-mixed atmosphere (hydrogen=5vol%；Argon gas=95vol%) at 600 DEG C
Sintering 5 hours, obtains iron manganese phosphate for lithium (LiMn0.8Fe0.2PO4) and grapheme composite positive electrode material.
2. iron manganese phosphate for lithium (LiMn is prepared0.8Fe0.2PO4) with the anode sizing agent of grapheme composite positive electrode material and just
Pole piece, comprises the following steps that：
A) dispersant is prepared：PVDF is mixed with NMP by weight 5/95, in 45 DEG C of closed containers
Stirring 6h.
B) positive electrode mixed slurry is prepared：Conductive carbon black is added in the dispersant for preparing, 25 DEG C are stirred
2h is mixed, iron manganese phosphate for lithium (LiMn is added0.8Fe0.2PO4) and grapheme composite positive electrode material, wherein, it is conductive
The percentage by weight of carbon black is 3%, and the percentage by weight of composite positive pole is 60%, the weight hundred of dispersant
Divide than being 37%.Anode sizing agent is stirred into 2h in closed container, anode sizing agent is obtained after uniform mixing.
C) anode sizing agent is coated uniformly on aluminium foil (thickness is 20 μm), one side coating amount is 10mg/cm2,
Dried after dual coating and obtain positive plate.
Positive plate and is cut into needs by d) the positive plate roll-in that will be dried to the 75%-80% of original depth
Shape is standby.
3. the negative plate of lithium-ions battery is prepared
(1) selection Delanium is used as negative material, by Delanium, conductive carbon Super-P, butadiene-styrene rubber,
Thickener (carboxymethylcellulose calcium) is by weight 95:2:2:1 mixes with deionized water, and stirring 2h is made negative pole slurry
Material.
(2) cathode size is coated on Copper Foil (thickness is 15 μm), one side coating amount is 5mg/cm2, it is two-sided
Dried after coating and obtain negative plate.
(3) the negative plate roll-in that will be dried to original depth 70-80%, and it is standby to cut into the shape of needs.
4. lithium-ions battery is prepared
PP material porous septums will be added in the middle of obtained positive plate and negative plate, be put into after being wound into naked battery core
Battery case, the main injection electrolyte in battery case, seal casinghousing after soldering polar ear is obtained lithium ion electric power storage
Pond, wherein, electrolyte is nonaqueous electrolytic solution, using the 1 of EC+DEC+EMC:1:1 mixed solvent dissolving
The LiPF of 1mol/L6。
Embodiment 2
1. iron manganese phosphate for lithium (LiMn is prepared0.5Fe0.5PO4) and grapheme composite positive electrode material, it includes following step
Suddenly：
(1) by graphene dispersion in ethanol solution, and neopelex is added as surface-active
Agent, ultrasonic 1h dispersions obtain graphene dispersing solution.
(2) by Li2CO3、MnCO3、FeC2O4And NH4H2PO40.5/0.5/0.5/1.0 mixing in molar ratio,
Ethanol dispersed with stirring is added, and adds the graphene dispersing solution for accounting for composite positive pole gross weight 5wt%, again
Ultrasonic disperse 1h, to solution agitating heating, precursors is obtained after solvent all evaporates.
(3) by precursors in hydrogen-argon-mixed atmosphere (hydrogen=3vol%；Argon gas=97vol%) at 550 DEG C
Sintering 6 hours, obtains iron manganese phosphate for lithium (LiMn0.5Fe0.5PO4) and grapheme composite positive electrode material.
2. iron manganese phosphate for lithium (LiMn is prepared0.5Fe0.5PO4) with the anode sizing agent of grapheme composite positive electrode material and just
Pole piece, specific steps are with reference to embodiment 1.
3. the negative plate of lithium-ions battery is prepared, and specific steps are with reference to embodiment 1.
4. lithium-ions battery is prepared, and specific steps are with reference to embodiment 1.
Embodiment 3
1. iron manganese phosphate for lithium (LiMn is prepared0.5Fe0.5PO4) with the composite positive pole of Graphene, its specific steps
With reference to the flow of embodiment 2.
2. iron manganese phosphate for lithium (LiMn is prepared0.5Fe0.5PO4) with the anode sizing agent of grapheme composite positive electrode material, tool
Body step is as follows：
A) dispersant is prepared：PVDF is mixed with NMP by weight 5/95, in 45 DEG C of closed containers
Stirring 6h.
B) positive electrode mixed slurry is prepared：Conductive carbon black is added in the dispersant for preparing, 25 DEG C are stirred
Mix 2h, then by iron manganese phosphate for lithium (LiMn0.5Fe0.5PO4) and grapheme composite positive electrode material, ternary material
(LiNi1/3Co1/3Mn1/3O2) add dispersant, wherein, the percentage by weight of conductive carbon black is 3%, phosphoric acid
Ferromanganese lithium (LiMn0.5Fe0.5PO4) with the percentage by weight of grapheme composite positive electrode material it is 40%, ternary material
(LiNi1/3Co1/3Mn1/3O2) percentage by weight be 20%, the percentage by weight of dispersant is 37%.To contain multiple
The anode sizing agent for closing positive electrode stirs 2h in closed container, and anode sizing agent is prepared after uniform mixing.
C) anode sizing agent is coated uniformly on aluminium foil (thickness is 20 μm), one side coating amount is 10mg/cm2,
Dried after dual coating and obtain positive plate.
Positive plate and is cut into needs by d) the positive plate roll-in that will be dried to the 75%-80% of original depth
Shape is standby.
3. the negative plate of lithium-ions battery is prepared, and specific steps are with reference to embodiment 1.
4. lithium-ions battery is prepared, and specific steps are with reference to embodiment 1.
Embodiment 4
1. iron manganese phosphate for lithium (LiMn is prepared0.5Fe0.5PO4) with the composite positive pole of Graphene, its specific steps
With reference to the flow of embodiment 2.
2. iron manganese phosphate for lithium (LiMn is prepared0.5Fe0.5PO4) with the anode sizing agent of grapheme composite positive electrode material, tool
Body step is as follows：
A) dispersant is prepared：PVDF is mixed with NMP by weight 5/95, in 45 DEG C of closed containers
Stirring 6h.
B) positive electrode mixed slurry is prepared：Conductive carbon black is added in the dispersant for preparing, 25 DEG C are stirred
Mix 2h, then by iron manganese phosphate for lithium (LiMn0.5Fe0.5PO4) and grapheme composite positive electrode material, cobalt acid lithium (LiCoO2)
In addition dispersant, wherein, the percentage by weight of conductive carbon black is 2%, iron manganese phosphate for lithium (LiMn0.5Fe0.5PO4)
It is 30%, cobalt acid lithium (LiCoO with the percentage by weight of grapheme composite positive electrode material2) percentage by weight
It is 30%, the percentage by weight of dispersant is 38%.By the anode sizing agent containing composite positive pole in closed appearance
2h is stirred in device, anode sizing agent is prepared after uniform mixing.
C) anode sizing agent is coated uniformly on aluminium foil (thickness is 20 μm), one side coating amount is 10mg/cm2,
Dried after dual coating and obtain positive plate.
Positive plate and is cut into needs by d) the positive plate roll-in that will be dried to the 70%-75% of original depth
Shape is standby.
3. the negative plate of lithium-ions battery is prepared, and specific steps are with reference to embodiment 1.
4. lithium-ions battery is prepared, and specific steps are with reference to embodiment 1.
Comparative example 1
1. iron manganese phosphate for lithium (LiMn is prepared0.5Fe0.5PO4) positive electrode, specific steps are right referring to embodiment 1
The positive pole material phosphoric acid ferromanganese lithium (LiMn of ratio 10.5Fe0.5PO4) not compound with Graphene.
2. iron manganese phosphate for lithium (LiMn is prepared0.5Fe0.5PO4) positive electrode anode sizing agent and positive plate, specific step
Rapid reference embodiment 1.
3. the negative plate of lithium-ions battery is prepared, and specific steps are with reference to embodiment 1.
4. lithium-ions battery is prepared, and specific steps are with reference to embodiment 1.
Comparative example 2：
1. ternary material (LiNi is prepared1/3Co1/3Mn1/3O2) positive plate, specific steps are with reference to embodiment 3.
2. the negative plate of lithium-ions battery is prepared, and specific steps are with reference to embodiment 3.
3. lithium-ions battery is prepared, and specific steps are with reference to embodiment 3.
Performance test
The 2Ah Soft Roll winding batteries that embodiment 1,2,3,4 is prepared with comparative example 1,2 are numbered respectively and is
1~No. 6, carry out following performance test：
1. internal resistance of cell test：The battery that battery 1000Hz frequency alternating currents are flowed down is tested using internal resistance of cell instrument
Internal resistance, as a result as shown in table 1.
2. peak power test：50%SOC battery discharge 10s, battery discharge stopping potential is 2.8V, work(
Formula is calculated rate value by the following method, as a result as shown in table 1：
3. safety test：According to《People's Republic of China's automobile industry standard -- lithium ion electric power storage used for electric vehicle
Pond》(QC/T 743-2006) safety experiment is tested, and test result is as shown in table 2：
The internal resistance of cell and the peak power test of the embodiment 1 to 4 of table 1 and the Soft Roll winding battery of comparative example 1 to 2 and
First cycle efficieny
| Performance test project | No. 1 | No. 2 | No. 3 | No. 4 | No. 5 | No. 6 |
| The internal resistance of cell (mohm) | 18.5 | 18.7 | 18.8 | 18.3 | 23 | 18.5 |
| Battery peak power (W) | 127 | 126 | 131 | 133 | 76 | 132 |
| First cycle efficieny (%) | 98 | 97 | 94 | 96 | 92 | 89 |
The safety test of the embodiment 1 to 4 of table 2 and the Soft Roll winding battery of comparative example 1 to 2
| Safety test project | No. 1 | No. 2 | No. 3 | No. 4 | No. 5 | No. 6 |
| Overdischarge is tested | Pass through | Pass through | Pass through | Pass through | Pass through | Pass through |
| Overcharge test | Pass through | Pass through | Pass through | Pass through | Pass through | Failure |
| Short-circuit test | Pass through | Pass through | Pass through | Pass through | Pass through | Failure |
| Drop test | Pass through | Pass through | Pass through | Pass through | Pass through | Pass through |
| Heating test | Pass through | Pass through | Pass through | Pass through | Pass through | Failure |
| Extruding test | Pass through | Pass through | Pass through | Pass through | Pass through | Failure |
| Lancing test | Pass through | Pass through | Pass through | Pass through | Pass through | Failure |
Be can be seen that relative to prior art from the test result of Tables 1 and 2, anode composite material of the present invention
Material has compared with the more preferable electronic conductivity of lithium iron manganese phosphate anode material, therefore using the composite positive pole
Power of battery performance is good, first cycle efficieny is high, and security performance ideal is unaffected.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned
Implementation method carries out appropriate change and modification.Therefore, the invention is not limited in disclosed and described above
Some modifications and changes of the invention should also be as falling into the guarantor of claim of the invention by specific embodiment
In the range of shield.Although additionally, having used some specific terms in this specification, these terms are to be
Facilitate explanation, any limitation is not constituted to the present invention.
Claims (10)
1. a kind of preparation method of lithium-ions battery composite positive pole, it is characterised in that including following step
Suddenly：
(1) by graphene dispersion in organic dispersing agent, surfactant, ultrasonic disperse 1-3h is added to obtain
Graphene dispersing solution；
(2) according to iron manganese phosphate for lithium design chemical formula by lithium carbonate, containing manganese compound, iron containing compoundses, contain
Phosphorus compound is well mixed in organic dispersing agent, to the graphene dispersion added in mixture described in step (1)
Liquid, ultrasonic disperse and agitating heating, precursors are obtained after solvent all evaporates again；And
(3) precursors are sintered 6-8 hours for 500~600 DEG C in hydrogen-argon-mixed atmosphere, the sintering of acquisition
Product is iron manganese phosphate for lithium and grapheme composite positive electrode material.
2. preparation method according to claim 1, it is characterised in that described containing manganese in step (2)
Compound is manganese sulfate, manganese carbonate or its combination, preferably manganese carbonate.
3. preparation method according to claim 1, it is characterised in that in step (2), the iron content
Compound is ferrous sulfate, ferrous oxalate, ferrous citrate or its combination, preferably ferrous oxalate.
4. preparation method according to claim 1, it is characterised in that described containing phosphatization in step (2)
Compound is ammonium hydrogen phosphate, ammonium dihydrogen phosphate, phosphorus pentoxide or its combination.
5. preparation method according to claim 1, it is characterised in that in step (2), lithium carbonate, contains
Manganese compound, iron containing compoundses, the mol ratio of phosphorus-containing compound are Li:(Fe+Mn):P=1:1:1.
6. preparation method according to claim 1, it is characterised in that the iron manganese phosphate for lithium of step (3) with
In grapheme composite positive electrode material, the percentage by weight of Graphene is 1~10%, the weight hundred of iron manganese phosphate for lithium
Divide than being 90~99%.
7. preparation method according to claim 1, it is characterised in that the iron manganese phosphate for lithium is olive
Stone structure compound, chemical general formula is LiMnxFeyMe1-x-yPO4, wherein 0.1<x<0.9,0.1<y<0.9,
Me is doped chemical, can be the one kind or many in Al, Mg, Ti, Ca, Zr, Mo, W, Co, Ni
Kind.
8. a kind of lithium-ions battery composite positive pole, it is characterised in that including iron manganese phosphate for lithium and graphite
Alkene, wherein, the percentage by weight of Graphene is 1~10%, and the percentage by weight of iron manganese phosphate for lithium is 90~99%.
9. lithium-ions battery composite positive pole according to claim 8, it is characterised in that described
Also include cobalt acid lithium (LiCoO in composite positive pole2), ternary material (LiNi1/3Co1/3Mn1/3O2), LiMn2O4,
Its percentage by weight≤40% in composite positive pole, preferably 10~40%.
10. a kind of lithium-ions battery, it includes positive plate, negative plate, be interval in positive plate and negative plate it
Between barrier film, and nonaqueous electrolyte, it is characterised in that contain claim 8 or 9 in the positive plate
Described composite positive pole.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112864360A (en) * | 2019-11-28 | 2021-05-28 | 珠海冠宇电池股份有限公司 | High-voltage positive pole piece and lithium ion secondary battery containing same |
| CN113366669A (en) * | 2019-02-18 | 2021-09-07 | Sm研究所股份有限公司 | Anode active material, method of preparing the same, and lithium secondary battery having anode including the anode active material |
| CN114678490A (en) * | 2022-03-25 | 2022-06-28 | 湖南蒙达新能源材料有限公司 | Lithium ion battery negative plate and preparation method thereof |
| CN116759560A (en) * | 2023-08-14 | 2023-09-15 | 中创新航科技集团股份有限公司 | Lithium iron manganese phosphate battery |
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| CN113366669A (en) * | 2019-02-18 | 2021-09-07 | Sm研究所股份有限公司 | Anode active material, method of preparing the same, and lithium secondary battery having anode including the anode active material |
| CN112864360A (en) * | 2019-11-28 | 2021-05-28 | 珠海冠宇电池股份有限公司 | High-voltage positive pole piece and lithium ion secondary battery containing same |
| CN114678490A (en) * | 2022-03-25 | 2022-06-28 | 湖南蒙达新能源材料有限公司 | Lithium ion battery negative plate and preparation method thereof |
| CN116759560A (en) * | 2023-08-14 | 2023-09-15 | 中创新航科技集团股份有限公司 | Lithium iron manganese phosphate battery |
| CN116759560B (en) * | 2023-08-14 | 2023-11-10 | 中创新航科技集团股份有限公司 | Lithium iron manganese phosphate battery |
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