CN103594685B - A kind of preparation method of modification of lithium ion battery anode material molybdenum trioxide - Google Patents
A kind of preparation method of modification of lithium ion battery anode material molybdenum trioxide Download PDFInfo
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- CN103594685B CN103594685B CN201310363610.3A CN201310363610A CN103594685B CN 103594685 B CN103594685 B CN 103594685B CN 201310363610 A CN201310363610 A CN 201310363610A CN 103594685 B CN103594685 B CN 103594685B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of preparation method of modification of lithium ion battery anode material molybdenum trioxide, preparation method is as follows: molybdenum salt and zinc salt are carried out ball mill mixing, in Muffle furnace, calcining obtains intermediate product, the molybdenum trioxide material of the zinc that namely adulterates, and molecular formula is (ZnO)
x(MoO
3)
1-x(0<x≤0.1); Intermediate product is joined in the mixed solvent of water and absolute ethyl alcohol, under agitation in mixed system, dropwise drip titanate esters, and add 65% ~ 68% nitric acid, titanate esters is hydrolyzed surface that the hydrated titanium dioxide produced is coated on molybdenum trioxide material, obtain after calcining adulterating and the coated molybdenum trioxide electrode material being total to modification, molecular formula is (ZnO)
x(MoO
3)
1-x/ TiO
2.The present invention adopts doping and coated two kinds of means to carry out modification to molybdenum trioxide material simultaneously, enhances the structural stability of molybdenum trioxide material in doff lithium process.Present invention process is simple, and obtained material specific capacity is high, good cycle.
Description
Technical field
The invention belongs to lithium ion secondary battery anode material field, be specifically related to a kind of preparation method of modification of lithium ion battery anode material molybdenum trioxide.
Background technology
Lithium rechargeable battery is the green power supply that 20th century, the nineties, new development was got up, and it enjoys researcher to pay close attention to excellent properties such as high reversible capacity, high voltage, high cycle performance and high-energy-densities, is called as the leading power supply of 21 century.The research of anode material for lithium-ion batteries mainly concentrates on lithium and cobalt oxides LiCoO
2, lithium nickel oxide LiNiO
2, olivine structural LiFePO
4with the LiMn of spinel structure
2o
4on.Business-like lithium ion battery mainly adopts LiCoO at present
2as positive electrode, because cobalt resource is day by day deficient, relative price is higher and have certain toxicity, limits it and further applies; LiNiO
2positive electrode synthesis is more difficult, and poor stability; LiFePO
4electron conduction is poor, how to carry out modification by the coated of C, but can reduce its volume energy density; The LiMn of spinel structure
2o
4discharge capacity low (about 110mAh/g), Applicable temperature narrow range (<55 DEG C).Therefore, seek new, that performance is good positive electrode and become the problem that Study on Li-ion batteries person extremely pays close attention to.
MoO
3for orthogonal layer structure, by [the MoO of common rib, corner-sharing
6] octahedra composition.Due to MoO
3two-dimensional layered structure be that Li ion transfer provides open passage, being applicable to the deintercalation of Li ion, is desirable lithium ion intercalation material.α-MoO
3in can reversibly embed and deintercalation about 1.5 unit lithium.As electrode material of lithium battery, there is the advantages such as specific capacity is large, aboundresources, security performance are good, but also there is capacity attenuation defect faster.Be raw material with ammonium molybdate according to the literature, obtain MoO by ion-exchange
3nH
2after the O hydrosol, then prepare MoO with the blended hydro-thermal reaction of carrying out of PEG
3nanobelt, at 0.4mAcm
-2current density and 1.5-3.45V voltage range, specific discharge capacity is 313mAh/g, through 20 times circulation after capability retention be 77%.The main cause of inducing capacity fading comprises two aspects: one is the embedding along with lithium, [MoO
6] octahedron slight distortion can occur, thus the active site of part doff lithium in crystal structure is disappeared; Two is because the Long Term Contact of electrode material and electrolyte can make part molybdenum ion be dissolved in electrolyte, also can cause the loss of electrode active material.
Summary of the invention
The present invention seeks to overcome molybdenum trioxide positive electrode capacity attenuation in charge and discharge cycles process not enough faster, by doping and coated two kinds of means, modification is carried out to molybdenum trioxide material, increase the structural stability of molybdenum trioxide material, improve its cycle performance.The method technique is simple, and obtained product has that specific capacity is high, the characteristic of good cycle.
The present invention takes following technical scheme to implement: a kind of preparation method of modification of lithium ion battery anode material molybdenum trioxide, and preparation method comprises the following steps:
(1) molybdenum salt and zinc salt are carried out ball mill mixing, in mass ratio molybdenum salt: zinc salt=1/7
m 1(1-
x):
m 2 x, wherein
m 1for the molecular weight of molybdenum salt,
m 2for the molecular weight of zinc salt,
xfor the Zn content adulterated in molybdenum trioxide positive electrode, 0 <
x≤ 0.1;
(2) batch mixing after ball milling is put into Muffle furnace, be heated to 450 DEG C of calcining 10 ~ 15 h, obtain intermediate product, the molybdenum trioxide positive electrode of the zinc that namely adulterates, molecular formula is (ZnO)
x(MoO
3)
1-x;
(3) by step (2) gained intermediate product through grinding after, be poured in mixed solvent, under the stirring of magnetic stirring apparatus, dropwise titanate esters is dripped in mixed system, 65% ~ 68% nitric acid is added again after dropwising, continue stirring 0.5 ~ 2 h, dry in 110 DEG C of baking ovens after washing 3 times through centrifuge precipitation, distilled water, wherein added each component intermediate product in mass ratio: mixed solvent: titanate esters: nitric acid=1:8:
ym 3/
m 4: 0.2, wherein
m 3for the molecular weight of titanate esters,
m 4for the molecular weight of titanium dioxide,
yfor titanium dioxide accounts for the mass fraction of intermediate product, 0 <
y≤ 0.08;
(4) step (3) gained drying object is put into Muffle furnace, be heated to 450 DEG C of calcining 4 ~ 6 h, obtain adulterating and the coated molybdenum trioxide positive electrode being total to modification, molecular formula is (ZnO)
x(MoO
3)
1-x/ TiO
2;
Molybdenum salt in step (1) is ammonium paramolybdate, and zinc salt is zinc nitrate or zinc acetate;
The ball milling speed of the ball mill mixing in step (1) is 200 ~ 300 revs/min, and the time of ball mill mixing is 0.5 ~ 2 h, and the mass ratio of batch mixing and zirconium ball is 1:4;
The heating rate of step (2) and the middle Muffle furnace of step (4) is 5 ~ 10 DEG C/min;
Mixed solvent in step (3) is that water mixes gained with absolute ethyl alcohol by the volume ratio of 1:10, and titanate esters is butyl titanate or tetraethyl titanate;
In step (3), the mixing speed of magnetic stirring apparatus is 300 ~ 500 revs/min.
The present invention has following advantage and effect: by being calcined by the batch mixing of zinc salt and molybdenum salt, obtain the molybdenum trioxide material of doping zinc, being entrained in the lattice framework of molybdenum trioxide material of zinc plays supporting role, effectively can suppress the structural aberration of molybdenum trioxide in doff lithium process, the structure of stabilizing material; By metatitanic acid ester hydrolysis, titanium dioxide on the Surface coating of the molybdenum trioxide material of doping zinc, the Surface coating of titanium dioxide can reduce molybdenum trioxide electrode material and contact with the direct of organic electrolyte, suppresses the dissolving of molybdenum ion in material, avoids the loss of active material; Present invention process is simple, and obtained material specific capacity is high, good cycle.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Fig. 1 is the doping of the embodiment of the present invention 1 preparation and the molybdenum trioxide positive electrode (ZnO) of coated modification altogether
0.05(MoO
3)
0.95/ TiO
2xRD figure.
Fig. 2 is the doping of the embodiment of the present invention 1 preparation and the molybdenum trioxide positive electrode (ZnO) of coated modification altogether
0.05(MoO
3)
0.95/ TiO
2cycle performance curve chart.
In Fig. 1, contrast known with standard XRD pattern card JCPDS No. 76-1003, doping and the coated molybdenum trioxide positive electrode (ZnO) being total to modification
0.05(MoO
3)
0.95/ TiO
2have orthorhombic phase layer structure, the doping of a small amount of zinc and the Surface coating of titanium dioxide do not change the crystal structure of molybdenum trioxide material.
In Fig. 2, charging/discharging voltage scope 1.5V ~ 4.0V, discharge-rate 0.1C.(ZnO)
0.05(MoO
3)
0.95/ TiO
2the discharge capacity first of positive electrode is 279.9mAh/g, and after 20 circulations, discharge capacity is 245.2mAh/g, and capability retention is 87.6%.
Embodiment
Embodiment 1: produce doping and the coated molybdenum trioxide positive electrode (ZnO) being total to modification
0.05(MoO
3)
0.95/ TiO
2powder 4.9g, productive rate 98%.Concrete steps are as follows:
(1) by 5.67g tetra-water ammonium paramolybdate and the mixing of 0.5g zinc nitrate hexahydrate, wherein the mass ratio of molybdenum salt, zinc salt is 1:0.088.The zirconium ball being 1:4 with material ball ratio together adds in ball grinder, with the speed ball mill mixing 1 hour of 250 revs/min on planetary ball mill.
(2) batch mixing after ball milling is put into Muffle furnace, be warmed up to 450 DEG C with the speed of 8 DEG C/min, be incubated 12 hours, be cooled to normal temperature, obtain intermediate product with stove, the molybdenum trioxide positive electrode powder 4.7g of the zinc that namely adulterates, molecular formula is (ZnO)
0.05(MoO
3)
0.95;
(3) intermediate product is after grinding, and be poured in the mixed solvent of 38g water and absolute ethyl alcohol, mixed solvent is that water mixes gained with absolute ethyl alcohol by the volume ratio of 1:10.With magnetic stirring apparatus, mixed system is stirred, mixing speed is 400 revs/min, under agitation in mixed system, dropwise drip 0.99g butyl titanate liquid, 65% ~ 68% nitric acid (hydrolytic accelerating agent) of 0.94g is added again after dropwising, continue stirring 1 h, dry in 110 DEG C of baking ovens after washing 3 times through centrifuge precipitation, distilled water, wherein added each component intermediate product in mass ratio: mixed solvent: titanate esters: hydrolytic accelerating agent=1:8:0.21:0.2, accounts for 5% of intermediate product quality by the quality of tetrabutyl titanate hydrolysis gained titanium dioxide;
(4) step (3) gained drying object is put into Muffle furnace, calcine 5 hs after being warming up to 450 DEG C with the speed of 8 DEG C/min, obtain adulterating and the coated molybdenum trioxide positive electrode being total to modification, molecular formula is (ZnO)
0.05(MoO
3)
0.95/ TiO
2.Fig. 1 is shown in by its XRD collection of illustrative plates.
The chemical property of gained sample measures as follows: positive electrode active material powder, conductive agent acetylene black, binding agent Kynoar in mass ratio 85:9:6 mix.Take 2.5g modification molybdenum trioxide positive electrode powder, add 0.26g acetylene black as conductive agent, add 0.18g Kynoar PVDF again as adhesive, solvent is made with 1-METHYLPYRROLIDONE NMP, speed ball milling with 280 revs/min on planetary ball mill after sealing mixes 2 hours, the slurry obtained evenly is coated on aluminium collector, and at 80 DEG C, vacuum drying 10 hours, obtains positive plate.Take metal lithium sheet as the LiPF of negative pole, 1.0mol/L
6/ EC+DMC (1:1) is electrolyte, Celgard2320 film is barrier film, in the glove box being full of argon gas, be assembled into battery, under 0.1C multiplying power, carry out constant current charge-discharge test, voltage range 1.5V ~ 4.0V, the charge/discharge capacity of test positive electrode and cycle performance.Its cycle performance curve chart is shown in Fig. 2.
Embodiment 2: produce doping and the coated molybdenum trioxide positive electrode (ZnO) being total to modification
0.01(MoO
3)
0.99/ TiO
2powder 3.75g, productive rate 98.7%.Concrete steps are as follows:
(1) by 4.59g tetra-water ammonium paramolybdate and the mixing of 0.058g bis-water zinc acetate, wherein the mass ratio of molybdenum salt, zinc salt is 1:0.013.The zirconium ball being 1:4 with material ball ratio together adds in ball grinder, with the speed ball mill mixing 0.5 hour of 200 revs/min on planetary ball mill.
(2) batch mixing after ball milling is put into Muffle furnace, be warmed up to 450 DEG C with the speed of 5 DEG C/min, be incubated 10 hours, be cooled to normal temperature, obtain intermediate product with stove, the molybdenum trioxide positive electrode powder 3.71g of the zinc that namely adulterates, molecular formula is (ZnO)
0.01(MoO
3)
0.99;
(3) intermediate product is after grinding, and be poured in the mixed solvent of 30g water and absolute ethyl alcohol, mixed solvent is that water mixes gained with absolute ethyl alcohol by the volume ratio of 1:10.With magnetic stirring apparatus, mixed system is stirred, mixing speed is 300 revs/min, under agitation in mixed system, dropwise drip 0.11g tetraethyl titanate liquid, 65% ~ 68% nitric acid (hydrolytic accelerating agent) of 0.74g is added again after dropwising, continue stirring 0.5 h, precipitate through centrifuge, dry in 110 DEG C of baking ovens after distilled water washs 3 times, wherein added each component intermediate product in mass ratio: mixed solvent: titanate esters: hydrolytic accelerating agent=1:8:0.03:0.2, 1% of intermediate product quality is accounted for by the quality of tetraethyl titanate hydrolysis gained titanium dioxide,
(4) step (3) gained drying object is put into Muffle furnace, calcine 4 hs after being warming up to 450 DEG C with the speed of 5 DEG C/min, obtain adulterating and the coated molybdenum trioxide positive electrode being total to modification, molecular formula is (ZnO)
0.01(MoO
3)
0.99/ TiO
2.
Detection method is with embodiment 1.The discharge capacity first of prepared material is 291mAh/g, and after 20 circulations, discharge capacity is 242.5mAh/g, and capability retention is 83.3%.
Embodiment 3: produce doping and the coated molybdenum trioxide positive electrode (ZnO) being total to modification
0.1(MoO
3)
0.9/ TiO
2powder 8.5g, productive rate 97.7%.Concrete steps are as follows:
(1) by 9.3g tetra-water ammonium paramolybdate and the mixing of 1.28g bis-water zinc acetate, wherein the mass ratio of molybdenum salt, zinc salt is 1:0.14.The zirconium ball being 1:4 with material ball ratio together adds in ball grinder, with the speed ball mill mixing 1.5 hours of 300 revs/min on planetary ball mill.
(2) batch mixing after ball milling is put into Muffle furnace, be warmed up to 450 DEG C with the speed of 10 DEG C/min, be incubated 13 hours, be cooled to normal temperature, obtain intermediate product with stove, the molybdenum trioxide positive electrode powder 8g of the zinc that namely adulterates, molecular formula is (ZnO)
0.1(MoO
3)
0.9;
(3) intermediate product is after grinding, and be poured in the mixed solvent of 64g water and absolute ethyl alcohol, mixed solvent is that water mixes gained with absolute ethyl alcohol by the volume ratio of 1:10.With magnetic stirring apparatus, mixed system is stirred, mixing speed is 500 revs/min, under agitation in mixed system, dropwise drip 2.72g butyl titanate liquid, 65% ~ 68% nitric acid (hydrolytic accelerating agent) of 1.6g is added again after dropwising, continue stirring 1.5 h, precipitate through centrifuge, dry in 110 DEG C of baking ovens after distilled water washs 3 times, wherein added each component intermediate product in mass ratio: mixed solvent: titanate esters: hydrolytic accelerating agent=1:8:0.34:0.2, 8% of intermediate product quality is accounted for by the quality of tetrabutyl titanate hydrolysis gained titanium dioxide,
(4) step (3) gained drying object is put into Muffle furnace, calcine 6 hs after being warming up to 450 DEG C with the speed of 10 DEG C/min, obtain adulterating and the coated molybdenum trioxide positive electrode being total to modification, molecular formula is (ZnO)
0.1(MoO
3)
0.9/ TiO
2.
Detection method is with embodiment 1.The discharge capacity first of prepared material is 275.6mAh/g, and after 20 circulations, discharge capacity is 237mAh/g, and capability retention is 86%.
Embodiment 4: produce doping and the coated molybdenum trioxide positive electrode (ZnO) being total to modification
0.04(MoO
3)
0.96/ TiO
2powder 11.8g, productive rate 98.3%.Concrete steps are as follows:
(1) by 13.56g tetra-water ammonium paramolybdate and the mixing of 0.95g zinc nitrate hexahydrate, wherein the mass ratio of molybdenum salt, zinc salt is 1:0.07.The zirconium ball being 1:4 with material ball ratio together adds in ball grinder, with the speed ball mill mixing 2 hours of 250 revs/min on planetary ball mill.
(2) batch mixing after ball milling is put into Muffle furnace, be warmed up to 450 DEG C with the speed of 10 DEG C/min, be incubated 15 hours, be cooled to normal temperature, obtain intermediate product with stove, the molybdenum trioxide positive electrode powder 11.2g of the zinc that namely adulterates, molecular formula is (ZnO)
0.04(MoO
3)
0.96;
(3) intermediate product is after grinding, and be poured in the mixed solvent of 90g water and absolute ethyl alcohol, mixed solvent is that water mixes gained with absolute ethyl alcohol by the volume ratio of 1:10.With magnetic stirring apparatus, mixed system is stirred, mixing speed is 450 revs/min, under agitation in mixed system, dropwise drip 1.9g tetraethyl titanate liquid, 65% ~ 68% nitric acid (hydrolytic accelerating agent) of 2.24g is added again after dropwising, continue stirring 2 h, dry in 110 DEG C of baking ovens after washing 3 times through centrifuge precipitation, distilled water, wherein added each component intermediate product in mass ratio: mixed solvent: titanate esters: hydrolytic accelerating agent=1:8:0.17:0.2, accounts for 6% of intermediate product quality by the quality of tetraethyl titanate hydrolysis gained titanium dioxide;
(4) step (3) gained drying object is put into Muffle furnace, calcine 5 hs after being warming up to 450 DEG C with the speed of 10 DEG C/min, obtain adulterating and the coated molybdenum trioxide positive electrode being total to modification, molecular formula is (ZnO)
0.04(MoO
3)
0.96/ TiO
2.
Detection method is with embodiment 1.The discharge capacity first of prepared material is 280.5mAh/g, and after 20 circulations, discharge capacity is 244mAh/g, and capability retention is 87%.
Involved in the present invention to reagent four water ammonium paramolybdate, zinc nitrate hexahydrate, two water zinc acetates, absolute ethyl alcohol, tetraethyl titanate, butyl titanate, 65% ~ 68% nitric acid, 1-METHYLPYRROLIDONE be chemically pure reagent, acetylene black, Kynoar, electrolyte LiPF
6/ EC+DMC (1:1) is LITHIUM BATTERY.
Claims (6)
1. a preparation method for modification of lithium ion battery anode material molybdenum trioxide, is characterized in that: preparation method comprises the following steps:
(1) molybdenum salt and zinc salt are carried out ball mill mixing, in mass ratio molybdenum salt: zinc salt=1/7
m 1(1-
x):
m 2 x, wherein
m 1for the molecular weight of molybdenum salt,
m 2for the molecular weight of zinc salt,
xfor the Zn content adulterated in molybdenum trioxide positive electrode, 0 <
x≤ 0.1;
(2) batch mixing after ball milling is put into Muffle furnace, be heated to 450 DEG C of calcining 10 ~ 15 h, obtain intermediate product, the molybdenum trioxide positive electrode of the zinc that namely adulterates, molecular formula is (ZnO)
x(MoO
3)
1-x;
(3) by step (2) gained intermediate product through grinding after, be poured in mixed solvent, under the stirring of magnetic stirring apparatus, dropwise titanate esters is dripped in mixed system, 65% ~ 68% nitric acid is added again after dropwising, continue stirring 0.5 ~ 2 h, dry in 110 DEG C of baking ovens after centrifugal, distilled water wash 3 times, wherein added each component intermediate product in mass ratio: mixed solvent: titanate esters: nitric acid=1:8:
ym 3/
m 4: 0.2, wherein
m 3for the molecular weight of titanate esters,
m 4for the molecular weight of titanium dioxide,
yfor titanium dioxide accounts for the mass fraction of intermediate product, 0 <
y≤ 0.08;
(4) step (3) gained drying object is put into Muffle furnace, be heated to 450 DEG C of calcining 4 ~ 6 h, obtain adulterating and the coated molybdenum trioxide positive electrode being total to modification, molecular formula is (ZnO)
x(MoO
3)
1-x/ TiO
2.
2. the preparation method of a kind of modification of lithium ion battery anode material molybdenum trioxide according to claim 1, it is characterized in that: the molybdenum salt in step (1) is ammonium paramolybdate, zinc salt is zinc nitrate or zinc acetate.
3. the preparation method of a kind of modification of lithium ion battery anode material molybdenum trioxide according to claim 1, it is characterized in that: the ball milling speed of the ball mill mixing in step (1) is 200 ~ 300 revs/min, the time of ball mill mixing is 0.5 ~ 2 h, and the mass ratio of batch mixing and zirconium ball is 1:4.
4. the preparation method of a kind of modification of lithium ion battery anode material molybdenum trioxide according to claim 1, is characterized in that: the heating rate of step (2) and the middle Muffle furnace of step (4) is 5 ~ 10 DEG C/min.
5. the preparation method of a kind of modification of lithium ion battery anode material molybdenum trioxide according to claim 1, it is characterized in that: the mixed solvent in step (3) is that water mixes gained with absolute ethyl alcohol by the volume ratio of 1:10, and titanate esters is butyl titanate or tetraethyl titanate.
6. the preparation method of a kind of modification of lithium ion battery anode material molybdenum trioxide according to claim 1, is characterized in that: in step (3), the mixing speed of magnetic stirring apparatus is 300 ~ 500 revs/min.
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CN105374577B (en) * | 2015-11-23 | 2018-08-24 | 太原理工大学 | Preparation and application with high specific capacitance characteristic molybdenum oxide powder electrode material |
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CN113293285B (en) * | 2021-05-21 | 2022-04-08 | 江苏中南锂业有限公司 | Preparation method of modified lithium extraction electrode with fast ion conductor |
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CN1349669A (en) * | 1999-03-23 | 2002-05-15 | 化合价技术股份有限公司 | Lithium-containing phosphate active materials |
CN101164870A (en) * | 2006-10-19 | 2008-04-23 | 喻维杰 | Method for manufacturing high performance composite phase lithium iron phosphate material |
CN101944587A (en) * | 2010-08-06 | 2011-01-12 | 广州市鹏辉电池有限公司 | Lithium manganese button secondary cell cathode and cell |
CN103050702A (en) * | 2011-10-17 | 2013-04-17 | 中国科学院大连化学物理研究所 | Application of carbon material containing in-situ doped component with catalytic activity to lithium-air battery |
CN103165881A (en) * | 2011-12-12 | 2013-06-19 | 张健 | Lithium iron phosphate doped nanometer anode material and preparation method thereof |
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