CN101399342A - Lithium iron phosphate positive pole material - Google Patents
Lithium iron phosphate positive pole material Download PDFInfo
- Publication number
- CN101399342A CN101399342A CNA2007101236223A CN200710123622A CN101399342A CN 101399342 A CN101399342 A CN 101399342A CN A2007101236223 A CNA2007101236223 A CN A2007101236223A CN 200710123622 A CN200710123622 A CN 200710123622A CN 101399342 A CN101399342 A CN 101399342A
- Authority
- CN
- China
- Prior art keywords
- source
- lithium
- iron phosphate
- phosphate positive
- lithium iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 title claims description 20
- 239000000126 substance Substances 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 37
- 239000011777 magnesium Substances 0.000 claims description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 229910052744 lithium Inorganic materials 0.000 claims description 15
- 229910052749 magnesium Inorganic materials 0.000 claims description 15
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 13
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims description 11
- 239000011574 phosphorus Substances 0.000 claims description 11
- 238000003836 solid-state method Methods 0.000 claims description 5
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 4
- 229930006000 Sucrose Natural products 0.000 claims description 4
- 239000006230 acetylene black Substances 0.000 claims description 4
- 239000005720 sucrose Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910013553 LiNO Inorganic materials 0.000 claims description 2
- 239000011269 tar Substances 0.000 claims description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 10
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 10
- 230000014759 maintenance of location Effects 0.000 abstract description 5
- 239000010450 olivine Substances 0.000 abstract description 4
- 229910052609 olivine Inorganic materials 0.000 abstract description 4
- 239000007774 positive electrode material Substances 0.000 abstract description 4
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 14
- 239000013078 crystal Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 230000004087 circulation Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910010710 LiFePO Inorganic materials 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 229910012820 LiCoO Inorganic materials 0.000 description 2
- 229910052493 LiFePO4 Inorganic materials 0.000 description 2
- 229910015645 LiMn Inorganic materials 0.000 description 2
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a lithium iron phosphate positive electrode material, the chemical formula thereof is Li1-xMgx/2FePO4/C, wherein, x is not less than or equal to 0.01 and not more than or equal to 0.04. The positive electrode material Li1-xMgx/2FePO4/C still has an olivine structure of the lithium iron phosphate, the high-current cycle test of 5A under the charge/15A under the discharge is carried out on a lithium-ion battery which adopts the positive electrode material Li1-xMgx/2FePO4/C at the normal temperature, the first discharge capacity is more than 138mAh/g, and the capacity retention rate after 80 cycles is more than 97 percent, thereby having good high-current charge-discharge performance.
Description
Technical field
The present invention relates to a kind of lithium iron phosphate positive material, especially a kind of lithium iron phosphate positive material with good high rate during charging-discharging.
Background technology
Lithium rechargeable battery with its high-energy-density, high discharge voltage, specific capacity is big and self-discharge rate is low etc., and advantage has replaced conventional batteries in fields such as mobile phone, notebook computer, electric tool and electric automobiles rapidly.The more positive electrode of domestic research mainly comprises LiCoO
2, LiNiO
2And LiMn
2O
4, the LiCoO of layer structure wherein
2It is good because of electrode performance, is the positive electrode that the commodity lithium ion battery extensively adopts on the market, but has the price height, pollutes shortcomings such as big; The LiMn of spinel structure
2O
4Obtain research extensively and profoundly in recent years, but on the low side because of its capacity, problem such as capacity attenuation is serious under the high temperature, range of application still is subjected to certain restriction; LiCoO with structural similarity
2Compare LiNiO
2Have the capacity height, advantage such as power is big, but have problems such as synthetic difficulty, poor heat stability, its practicalization is slower always.The aboundresources of iron, environmental friendliness, low price, so iron is that positive electrode more and more is subjected to people's attention.
That the application future is arranged in all ferrous materials most is olivine-type LiFePO
4, its theoretical capacity is 170mAh/g, is about 3.4V with respect to the stable discharging platform of lithium metal negative pole, and raw material resources are abundant, and low price is nontoxic, helps environmental protection, and Heat stability is good is safe, and adopts conventional high temperature solid-state method conveniently to make.LiFePO
4The subject matter that exists is that its conductivity is low, and high rate during charging-discharging awaits further to improve.
Summary of the invention
Technical problem to be solved by this invention provides a kind of lithium iron phosphate positive material with good high rate during charging-discharging.
For solving the problems of the technologies described above, the invention provides a kind of lithium iron phosphate positive material, its chemical formula is Li
1-xMg
X/2FePO
4/ C, wherein 0.01≤x≤0.04.
LiFePO
4The main cause that has defective on chemical property is exactly that the diffusion rate of lithium ion is less, and the also lower (LiFePO of the electronic conductivity of himself
4Electronic conductivity be about 10
9～10
9S/cm, lithium ion is at LiFePO
4-FePO
4Diffusion coefficient between the two-phase is 1.8*10
-14Cm
2/ s), the lower conductance and the diffusion rate of lithium ion become the restraining factors of electrode process, and it is relatively poor to cause the lithium ion of this material to take off the embedding invertibity.Positive electrode Li of the present invention
1-xMg
X/2FePO
4/ C is a kind of to LiFePO
4Carry out the magnesium ion doping and add the composite positive pole that obtains behind the carbon.At LiFePO
4In magnesium-doped metal ion, the magnesium metal ion is because the same ligancy with lithium ion is 6, but ionic radius is littler than lithium ion, thereby is easy to enter LiO
6Replace the position of lithium with part in octahedral gap, form stable olivine structural and make LiFePO
4Chemical property be improved.At LiFePO
4Add carbon, carbon is evenly distributed in LiFePO
4Intergranule or be coated on LiFePO
4The surface of crystal grain makes LiFePO
4The electric conductivity of crystal grain obviously improves, and adopts this LiFePO
4The electrode of positive electrode obtains internal resistance to be reduced, and the chemical property that has improved battery is high rate performance especially.Simultaneously, add carbon and can also be suppressed at LiFePO in the building-up process
4The growth of crystal grain makes LiFePO
4Crystal grain diminishes and is evenly distributed, avoided electrode when charging take off because of crystal grain is excessive lithium thoroughly and during discharge lithium ion between CRYSTALLITE SIZES, distribute disproportionate, the different adverse effects of migration distance to battery performance, improved LiFePO
4Capacity performance and cycle performance.
Lithium iron phosphate positive material of the present invention can adopt carbon source, lithium source, source of iron, magnesium source and phosphorus source to obtain according to high temperature solid-state method.This high temperature solid-state method and preparation LiFePO
4Conventional high temperature solid-state method identical.
Be used to prepare lithium iron phosphate positive material, carbon source can be selected at least a in acetylene black, tar, activated carbon, graphite and the sucrose for use, and the lithium source can be selected Li for use
2CO
3, LiOHH
2O, LiNO
3And Li
3PO
4In at least a, source of iron can be selected FeC for use
2O
42H
2O, FeO, Fe
2O
3, Fe
3O
4, Fe (NO
3)
2And Fe (NO
3)
3In at least a, the magnesium source can be selected MgO, Mg (OH) for use
2, Mg, Mg (H
2PO
4)
22H
2At least a among the O, the phosphorus source can be selected NH for use
4H
2PO
4, LiH
2PO
4, Li
2HPO
4, Li
3PO
4, (NH
4)
2HPO
4(NH4)
3PO
4In at least a.
Be used to prepare lithium iron phosphate positive material, the mol ratio in source of iron, phosphorus source, lithium source and magnesium source is 1:1:0.92～0.98:0.01～0.04; The carbon source consumption is the 8wt%～15wt% of source of iron, phosphorus source, lithium source and magnesium source consumption sum.
The invention has the beneficial effects as follows: positive electrode Li of the present invention
1-xMg
X/2FePO
4/ C still has the olivine structural of LiFePO4, adopts positive electrode Li of the present invention
1-xMg
X/2FePO
4The lithium ion battery of/C carries out 5A at normal temperatures and fills/big current cycle test that 15A is put, and discharge capacity is more than 138mAh/g first, and the capability retention after 80 circulations has good high rate during charging-discharging more than 97%.
Description of drawings
Below by embodiment also in conjunction with the accompanying drawings, the present invention is described in further detail:
Fig. 1 is the SEM photo of embodiment one gained positive electrode;
Fig. 2 is the XRD figure spectrum of embodiment one gained positive electrode;
Fig. 3 is that the sample battery 5A that adopts embodiment one gained positive electrode fills/cyclic curve figure that 15A is put;
Fig. 4 is that the sample battery 5A that adopts embodiment two gained positive electrodes fills/cyclic curve figure that 15A is put;
Fig. 5 is that the sample battery 5A that adopts embodiment three gained positive electrodes fills/cyclic curve figure that 15A is put.
Embodiment
Embodiment one
Carbon source is an acetylene black, and the lithium source is Li
2CO
3, source of iron is FeC
2O
42H
2O, the magnesium source is Mg (OH)
2, the phosphorus source is NH
4H
2PO
4, mol ratio FeC
2O
42H
2O:NH
4H
2PO
4: Li
2CO
3: Mg (OH)
2=1:1:0.96:0.02, the acetylene black addition is FeC
2O
42H
2O, NH
4H
2PO
4, Li
2CO
3And Mg (OH)
2The 12wt% of consumption sum, above-mentioned each composition is uniformly dispersed in acetone, put into ball mill grinding, after heating makes acetone evaporated, the material after mixed the grinding is put into the nitrogen atmosphere tube furnace at 300 ℃ of heating 12h, grind after the cold cut, be pressed into piece, calcine 24h at 650 ℃ again in nitrogen atmosphere pipe examination stove, cold cut is ground and is obtained present embodiment Li
0.96Mg
0.02FePO
4/ C positive electrode.
With Li
0.96Mg
0.02FePO
4/ C is that positive active material, conductive carbon black are that conductive agent, PVDF are that binding agent, NMP are solvent preparation anode sizing agent, weight ratio Li
0.96Mg
0.02FePO
4/ C: conductive carbon black: PVDF:NMP=94:2:4:120 is coated on the gained anode sizing agent that to make surface density on the aluminium foil be 22.5mg/cm
2Positive plate; With 92 parts of Osaka graphite is negative electrode active material, and adding 4 parts of acetylene blacks is conductive agent, and 4 parts of PVDF are binding agent, and 120 parts of NMP are that to make surface density be 9.8mg/cm to solvent
2Negative plate, adopt barrier film and the lithium hexafluoro phosphate electrolyte of east combustion 23u, make 18650 type Experimental cells.
Present embodiment Li
0.96Mg
0.02FePO
4The SEM photo of/C positive electrode as shown in Figure 1, XRD figure is composed as shown in Figure 2.From Fig. 1 as seen, the material grains particle diameter is at 2 μ m～4 μ m, and is evenly distributed.From Fig. 2 as seen, present embodiment Li
0.96Mg
0.02FePO
4/ C positive electrode still has the olivine structural of LiFePO4.
Experimental cell is carried out 5A fill/loop test that 15A is put, as shown in Figure 3, the capability retention after 80 circulations is 97.12%.The discharge capacity first of sample battery reaches 138.00mAh/g under the normal temperature.
Embodiment two
The difference of present embodiment and embodiment one is: carbon source is a tar, and the lithium source is LiOHH
2O, source of iron is FeO, and the magnesium source is MgO, and the phosphorus source is (NH4)
3PO
4, mol ratio FeO:(NH4)
3PO
4: LiOHH
2O:MgO=1:1:0.98:0.01, the tar addition is FeO, (N
H4)
3PO
4, LiOHH
2The 8wt% of O and MgO consumption sum.The present embodiment positive electrode is Li
0.98Mg
0.01FePO
4/ C.
Make 18650 type Experimental cells according to prescription and the technology identical with embodiment one.
Experimental cell is carried out 5A fill/loop test that 15A is put, as shown in Figure 4, the capability retention after 80 circulations is 97.81%.The discharge capacity first of sample battery reaches 138.93mAh/g under the normal temperature.
Embodiment three
The difference of present embodiment and embodiment one is: carbon source is a sucrose, and source of iron is Fe
2O
3, the magnesium source is Mg (H
2PO
4)
22H
2O, the phosphorus source is (NH
4)
2HPO
4, mol ratio Fe
2O
3: (NH
4)
2HPO
4: Li
2CO
3: Mg (H
2PO
4)
22H
2O=1:1:0.92:0.04, the sucrose addition is Fe
2O
3, (NH
4)
2HPO
4, Li
2CO
3And Mg (H
2PO
4)
22H
2The 15wt% of O consumption sum.The present embodiment positive electrode is Li
0.92Mg
0.04FePO
4/ C.
Make 18650 type Experimental cells according to prescription and the technology identical with embodiment one.
Experimental cell is carried out 5A fill/loop test that 15A is put, as shown in Figure 4, the capability retention after 80 circulations is 97.05%.The discharge capacity first of sample battery reaches 139.46mAh/g under the normal temperature.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1, a kind of lithium iron phosphate positive material is characterized in that: its chemical formula is Li
1-xMg
X/2FePO
4/ C, wherein 0.01≤x≤0.04.
2, lithium iron phosphate positive material according to claim 1 is characterized in that: described lithium iron phosphate positive material adopts carbon source, lithium source, source of iron, magnesium source and phosphorus source to obtain according to high temperature solid-state method.
3, lithium iron phosphate positive material according to claim 1 and 2 is characterized in that: be used to prepare described lithium iron phosphate positive material, described carbon source comprises at least a in acetylene black, tar, activated carbon, graphite and the sucrose; Described lithium source comprises Li
2CO
3, LiOHH
2O, LiNO
3And Li
3PO
4In at least a; Described source of iron comprises FeC
2O
42H
2O, FeO, Fe
2O
3, Fe
3O
4, Fe (NO
3)
2And Fe (NO
3)
3In at least a; Described magnesium source comprises MgO, Mg (OH)
2, Mg, Mg (H
2PO
4)
22H
2At least a among the O; Described phosphorus source comprises NH
4H
2PO
4, LiH
2PO
4, Li
2HPO
4, Li
3PO
4, (NH
4)
2HPO
4(NH4)
3PO
4In at least a.
4, lithium iron phosphate positive material according to claim 3 is characterized in that: be used to prepare described lithium iron phosphate positive material, the mol ratio in described source of iron, phosphorus source, lithium source and magnesium source is 1:1:0.92～0.98:0.01～0.04; Described carbon source consumption is the 8wt%～15wt% of described source of iron, phosphorus source, lithium source and magnesium source consumption sum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101236223A CN101399342A (en) | 2007-09-28 | 2007-09-28 | Lithium iron phosphate positive pole material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101236223A CN101399342A (en) | 2007-09-28 | 2007-09-28 | Lithium iron phosphate positive pole material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101399342A true CN101399342A (en) | 2009-04-01 |
Family
ID=40517720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101236223A Pending CN101399342A (en) | 2007-09-28 | 2007-09-28 | Lithium iron phosphate positive pole material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101399342A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559935B (en) * | 2009-05-26 | 2011-05-04 | 华南理工大学 | Lithium iron phosphate cathode material and preparation method thereof |
| CN102522541A (en) * | 2011-12-02 | 2012-06-27 | 苏州冠硕新能源有限公司 | Anode material and preparation method thereof |
| CN105406045A (en) * | 2015-12-21 | 2016-03-16 | 李梦思 | Composite lithium ion battery cathode material and preparation method thereof |
| CN114335478A (en) * | 2021-12-31 | 2022-04-12 | 四川大学 | Magnesium-doped lithium iron phosphate/carbon composite microsphere with high tap density as well as preparation method and application thereof |
-
2007
- 2007-09-28 CN CNA2007101236223A patent/CN101399342A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101559935B (en) * | 2009-05-26 | 2011-05-04 | 华南理工大学 | Lithium iron phosphate cathode material and preparation method thereof |
| CN102522541A (en) * | 2011-12-02 | 2012-06-27 | 苏州冠硕新能源有限公司 | Anode material and preparation method thereof |
| CN105406045A (en) * | 2015-12-21 | 2016-03-16 | 李梦思 | Composite lithium ion battery cathode material and preparation method thereof |
| CN114335478A (en) * | 2021-12-31 | 2022-04-12 | 四川大学 | Magnesium-doped lithium iron phosphate/carbon composite microsphere with high tap density as well as preparation method and application thereof |
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