CN109616655A - Double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery and preparation method - Google Patents
Double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery and preparation method Download PDFInfo
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- CN109616655A CN109616655A CN201811538699.1A CN201811538699A CN109616655A CN 109616655 A CN109616655 A CN 109616655A CN 201811538699 A CN201811538699 A CN 201811538699A CN 109616655 A CN109616655 A CN 109616655A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 80
- ZOIKAOIYOCLPME-UHFFFAOYSA-N lithium iron(2+) borate Chemical compound B([O-])([O-])[O-].[Fe+2].[Li+] ZOIKAOIYOCLPME-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 66
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 40
- 235000011180 diphosphates Nutrition 0.000 title claims abstract description 33
- 239000011248 coating agent Substances 0.000 title claims abstract description 29
- 238000000576 coating method Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000010405 anode material Substances 0.000 title claims abstract description 23
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 title claims 11
- -1 nickel pyrophosphate Chemical compound 0.000 claims abstract description 37
- 229920001558 organosilicon polymer Polymers 0.000 claims abstract description 37
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000002245 particle Substances 0.000 claims abstract description 29
- 239000011246 composite particle Substances 0.000 claims abstract description 28
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 18
- 238000005253 cladding Methods 0.000 claims abstract description 8
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 55
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000008367 deionised water Substances 0.000 claims description 25
- 229910021641 deionized water Inorganic materials 0.000 claims description 25
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 24
- CCGVUDBEYFGUOG-UHFFFAOYSA-N [Li].[Fe].B(O)(O)O Chemical compound [Li].[Fe].B(O)(O)O CCGVUDBEYFGUOG-UHFFFAOYSA-N 0.000 claims description 22
- 239000002994 raw material Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 16
- 229920002379 silicone rubber Polymers 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 239000000571 coke Substances 0.000 claims description 15
- 239000002356 single layer Substances 0.000 claims description 10
- 229910000159 nickel phosphate Inorganic materials 0.000 claims description 9
- JOCJYBPHESYFOK-UHFFFAOYSA-K nickel(3+);phosphate Chemical compound [Ni+3].[O-]P([O-])([O-])=O JOCJYBPHESYFOK-UHFFFAOYSA-K 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 239000004945 silicone rubber Substances 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- 229920001971 elastomer Polymers 0.000 claims description 7
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 claims description 4
- 229920005560 fluorosilicone rubber Polymers 0.000 claims description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 3
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 230000008021 deposition Effects 0.000 claims description 2
- XPPKVPWEQAFLFU-UHFFFAOYSA-N diphosphoric acid Chemical compound OP(O)(=O)OP(O)(O)=O XPPKVPWEQAFLFU-UHFFFAOYSA-N 0.000 abstract description 24
- 239000000463 material Substances 0.000 abstract description 22
- 229940048084 pyrophosphate Drugs 0.000 abstract description 22
- 230000007547 defect Effects 0.000 abstract description 11
- 239000002131 composite material Substances 0.000 abstract description 10
- 230000007423 decrease Effects 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 230000001681 protective effect Effects 0.000 abstract description 3
- 229940005657 pyrophosphoric acid Drugs 0.000 abstract description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 235000013339 cereals Nutrition 0.000 description 28
- 229910001416 lithium ion Inorganic materials 0.000 description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 238000002242 deionisation method Methods 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 6
- 239000008187 granular material Substances 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 238000009831 deintercalation Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
Classifications
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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
- H01M4/362—Composites
- H01M4/366—Composites as layered products
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
-
- 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
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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
- H01M4/624—Electric conductive fillers
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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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- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention relates to the technical field of anode material of lithium battery, a kind of double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery and preparation method are provided.This method first passes through hydro-thermal reaction in-situ preparation lithium titanate and coats to iron borate lithium particle; then iron borate lithium particle surface is coated in lithium titanate by sprayed deposit and forms pyrophosphoric acid nickel layer; double-coating iron borate lithium/nickel pyrophosphate composite particles are made in further one layer of organosilicon polymer protective film of cladding.It is compared with the traditional method, the present invention carries out double-coating to iron borate lithium/nickel pyrophosphate composite positive pole with lithium titanate and organosilicon polymer, not only overcome iron borate lithium material poorly conductive, contacted the defect for leading to chemical property rapid decrease with air, but overcome nickel pyrophosphate material volume variation greatly, the defect of cyclical stability difference.
Description
Technical field
The invention belongs to the technical fields of anode material of lithium battery, provide a kind of double-coating iron borate lithium/pyrophosphoric acid
Nickel anode material of lithium battery and preparation method.
Background technique
Lithium battery is to rely primarily on the movement of lithium ion between a positive electrode and a negative electrode to carry out work.In charge and discharge process,
Li+Insertion and deintercalation back and forth between two electrodes: when charging, Li+From positive deintercalation, cathode is embedded in by electrolyte, at cathode
In lithium-rich state；It is then opposite when electric discharge.Lithium battery has the following characteristics that high voltage, high capacity, low consumption, memory-less effect, nothing
Public hazards, small in size, internal resistance is small, self discharge is few, cycle-index is more.Because of its These characteristics, lithium battery be widely used in mobile phone,
Laptop, video camera, digital camera, electric vehicle etc. be numerous civilian and military field.
It is higher that the positive electrode of lithium battery is typically chosen current potential, and metastable embedding lithium transition-metal oxidation in air
Object, boride, silicide, phosphide etc..The research and application of novel anode material become the important topic of lithium battery development.
Iron borate lithium is a kind of novel anode material for lithium-ion batteries with practical prospect, and structure belongs to monoclinic crystal
It is C2/c space group, due to having many advantages, such as environmental-friendly, at low cost, specific capacity and the high pass for having attracted people of energy density
Note, but its development is limited due to the disadvantages such as its surface is low to air-sensitive and conductivity.In addition, pyrophosphate compound is made
For a kind of novel polyanionic positive electrode, there is three-dimensional network structure, show preferable structural stability, relatively
In traditional phosphoric acid salt positive electrode, pyrophosphate can provide the two-dimentional tunnel structure that can be freely moved for lithium ion, thus have
There is good chemical property, but the variation of nickel pyrophosphate material volume is greatly, affects the cyclical stability of material.
As it can be seen that the existing iron borate lithium material for anode material of lithium battery there are poorly conductive, contact and lead with air
The defect of chemical property rapid decrease is sent a telegraph, and nickel pyrophosphate material haves the defects that volume change is big, cyclical stability is poor.
Therefore, using iron borate lithium/nickel pyrophosphate composite material as anode material of lithium battery, and certain technology is used
Means overcome the defect of the two, have great importance.
Summary of the invention
The invention proposes a kind of double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery and preparation methods, both
It overcomes iron borate lithium material poorly conductive, contact the defect for leading to chemical property rapid decrease with air, and overcome coke
Nickel phosphate material volume change greatly, the defect of cyclical stability difference.
To achieve the above object, specific technical solution of the present invention is as follows:
Double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery preparation method, the anode material of lithium battery preparation
Specific step is as follows:
(1) nano-titanium dioxide, nano boric acid iron lithium are added in the deionized water solution of lithium hydroxide, ultrasonic disperse 10 ~
20min is then transferred in hydrothermal reaction kettle, and heating is reacted, and is filtered after cooling, is first washed 2 ~ 3 times with dehydrated alcohol, then
It is washed with deionized 2 ~ 3 times, 15 ~ 20h is then dried in vacuo at 70 ~ 80 DEG C, then ground, lithium titanate Boron Coated is made
Sour iron lithium particle；
(2) nanometer nickel pyrophosphate being added in deionized water, then dispersion liquid is sprayed by 20 ~ 30min of ultrasonic disperse,
The cladding iron borate lithium particle surface one coke charge nickel phosphate of deposition of lithium titanate made from step (1), obtained single layer cladding iron borate lithium/
Nickel pyrophosphate composite particles；
(3) organosilicon polymer is added in n-hexane, stirs to being completely dissolved, is then added made from step (2) compound
Grain, is uniformly mixed, then heating removes solvent hexane at 80 DEG C, and organosilicon polymer is made to be coated on composite particles table
Double-coating iron borate lithium/nickel pyrophosphate composite particles are made in face.
Preferably, the parts by weight of step (1) each raw material are 3 ~ 4 parts by weight of nano-titanium dioxide, nano boric acid iron lithium
30 ~ 40 parts by weight, 2.5 ~ 3 parts by weight of lithium hydroxide, 53 ~ 64.5 parts by weight of deionized water.
Preferably, the temperature of step (1) described hydro-thermal reaction is 160 ~ 170 DEG C, and the time is 9 ~ 11h.
Preferably, the parts by weight of step (2) each raw material are 15 ~ 20 parts by weight of nanometer nickel pyrophosphate, deionized water 50
~ 65 parts by weight, lithium titanate coat 20 ~ 30 parts by weight of iron borate lithium particle.
Preferably, step (3) organosilicon polymer is methyl silicone rubber, methyl vinyl silicone rubber, fluorine silicone rubber
At least one of.The silicon rubber is raw rubber.
Preferably, the parts by weight of step (3) each raw material are, 1.5 ~ 2 parts by weight of organosilicon polymer, n-hexane 58 ~
68.5 parts by weight, 30 ~ 40 parts by weight of composite particles.
Preferably, the speed of step (3) described stirring is 300 ~ 500r/min, and the time is 2 ~ 3h.
Preferably, the average grain diameter of the nano-titanium dioxide is 10 ~ 20nm；The average grain diameter of the nano boric acid iron lithium
For 100 ~ 150nm；The average grain diameter of the nanometer nickel pyrophosphate is 50 ~ 100nm.
When positive electrode of the iron borate lithium as lithium ion battery, the defect of itself conductive difference, not only electronics
Conductivity is lower, and lithium ion diffusion rate is lower.Moreover, iron borate lithium is more sensitive to moisture and oxygen, at room temperature
The rapid decrease that will lead to specific capacity is contacted with a small amount of air.When nickel pyrophosphate is used as the positive electrode of lithium ion battery, by
Cause material volume variation obvious during insertion is with deintercalation in lithium ion, to reduce the stable circulation of positive electrode
Property.
For the defect for overcoming iron borate lithium and nickel pyrophosphate material, the electric conductivity and stability of composite positive pole are improved,
The present invention is prepared for double-coating iron borate lithium/nickel pyrophosphate composite particles, and structural schematic diagram is as shown in Figure of description 1.
The effect of organosilicon polymer clad essentially consists in: first is that form protective film in particle surface, resist moisture in air and
The infringement of oxygen reduces the decline of the chemical property after positive electrode exposes in air；Second is that utilizing organic silicon raw rubber
Good elasticity balances the volume change of nickel pyrophosphate material, the variation of material crystal structure is prevented, to improve stability.
And the effect of lithium titanate clad essentially consists in: first is that using the good electron conduction of lithium titanate, and the 3D structure of lithium titanate
It can be spread for lithium ion and channel is provided, spread so that the electronics between iron borate lithium and nickel pyrophosphate be promoted to conduct with lithium ion,
Improve the electric conductivity of material；Second is that the stability using lithium titanate under high voltages, plays the structure of composite positive pole
Stabilization.
The present invention also provides a kind of double-coating iron borate lithium that above-mentioned preparation method is prepared/nickel pyrophosphate lithium electricity
Pond positive electrode.The anode material of lithium battery is to first pass through hydro-thermal reaction in-situ preparation lithium titanate to carry out iron borate lithium particle
Then cladding coats iron borate lithium particle surface in lithium titanate by sprayed deposit and forms pyrophosphoric acid nickel layer, further coats one
Layer organosilicon polymer protective film and be made.
The present invention provides a kind of double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery and preparation method, with
The prior art is compared, and the feature and excellent effect protruded is:
1. preparation method of the invention, iron borate lithium material poorly conductive is overcome, is contacted with air and causes chemical property fast
The defect of speed decline.
2. preparation method of the invention, overcome the variation of nickel pyrophosphate material volume greatly, the defect of cyclical stability difference.
Detailed description of the invention
Fig. 1 is double-coating iron borate lithium/nickel pyrophosphate positive electrode structural schematic diagram.
Specific embodiment
In the following, the present invention will be further described in detail by way of specific embodiments, but this should not be interpreted as to the present invention
Range be only limitted to example below.Without departing from the idea of the above method of the present invention, according to ordinary skill
The various replacements or change that knowledge and customary means are made, should be included in the scope of the present invention.
Embodiment 1
(1) nano-titanium dioxide, nano boric acid iron lithium are added in the deionized water solution of lithium hydroxide, ultrasonic disperse 14min,
It is then transferred in hydrothermal reaction kettle, heating is reacted, and is filtered, is first washed 2 times with dehydrated alcohol, then use deionization after cooling
Water washing 3 times, it is then dried in vacuo 17h at 76 DEG C, then ground, lithium titanate is made and coats iron borate lithium particle；Each original
The parts by weight of material are, 3 parts by weight of nano-titanium dioxide, 34 parts by weight of nano boric acid iron lithium, 2.5 parts by weight of lithium hydroxide, go from
Sub- 60.5 parts by weight of water；The temperature of hydro-thermal reaction is 166 DEG C, time 10h；The average grain diameter of nano-titanium dioxide is 16nm；
The average grain diameter of nano boric acid iron lithium is 130nm；
(2) nanometer nickel pyrophosphate is added in deionized water, then dispersion liquid is sprayed, in step by ultrasonic disperse 26min
(1) lithium titanate made from coats iron borate lithium particle surface and deposits a coke charge nickel phosphate, and single layer is made and coats iron borate lithium/coke phosphorus
Sour nickel composite granules；The parts by weight of each raw material are 17 parts by weight of nanometer nickel pyrophosphate, 59 parts by weight of deionized water, lithium titanate packet
Cover 24 parts by weight of iron borate lithium particle；The average grain diameter of nanometer nickel pyrophosphate is 70nm；
(3) organosilicon polymer is added in n-hexane, stirs to being completely dissolved, is then added made from step (2) compound
Grain, is uniformly mixed, then heating removes solvent hexane at 80 DEG C, and organosilicon polymer is made to be coated on composite particles table
Double-coating iron borate lithium/nickel pyrophosphate composite particles are made in face；Organosilicon polymer is methyl silicone rubber；Silicon rubber is made a living
Glue；The parts by weight of each raw material are 1.7 parts by weight of organosilicon polymer, 64.3 parts by weight of n-hexane, 34 parts by weight of composite particles；
The speed of stirring is 380r/min, time 2.5h.
Embodiment 2
(1) nano-titanium dioxide, nano boric acid iron lithium are added in the deionized water solution of lithium hydroxide, ultrasonic disperse 12min,
It is then transferred in hydrothermal reaction kettle, heating is reacted, and is filtered, is first washed 2 times with dehydrated alcohol, then use deionization after cooling
Water washing 2 times, it is then dried in vacuo 19h at 72 DEG C, then ground, lithium titanate is made and coats iron borate lithium particle；Each original
The parts by weight of material are, 3 parts by weight of nano-titanium dioxide, 32 parts by weight of nano boric acid iron lithium, 2.5 parts by weight of lithium hydroxide, go from
Sub- 62.5 parts by weight of water；The temperature of hydro-thermal reaction is 162 DEG C, time 10.5h；The average grain diameter of nano-titanium dioxide is
12nm；The average grain diameter of nano boric acid iron lithium is 110nm；
(2) nanometer nickel pyrophosphate is added in deionized water, then dispersion liquid is sprayed, in step by ultrasonic disperse 23min
(1) lithium titanate made from coats iron borate lithium particle surface and deposits a coke charge nickel phosphate, and single layer is made and coats iron borate lithium/coke phosphorus
Sour nickel composite granules；The parts by weight of each raw material are 16 parts by weight of nanometer nickel pyrophosphate, 62 parts by weight of deionized water, lithium titanate packet
Cover 22 parts by weight of iron borate lithium particle；The average grain diameter of nanometer nickel pyrophosphate is 60nm；
(3) organosilicon polymer is added in n-hexane, stirs to being completely dissolved, is then added made from step (2) compound
Grain, is uniformly mixed, then heating removes solvent hexane at 80 DEG C, and organosilicon polymer is made to be coated on composite particles table
Double-coating iron borate lithium/nickel pyrophosphate composite particles are made in face；Organosilicon polymer is methyl vinyl silicone rubber；Silicon rubber
Glue is raw rubber；The parts by weight of each raw material are 1.6 parts by weight of organosilicon polymer, 66.4 parts by weight of n-hexane, 32 weight of composite particles
Measure part；The speed of stirring is 350r/min, time 3h.
Embodiment 3
(1) nano-titanium dioxide, nano boric acid iron lithium are added in the deionized water solution of lithium hydroxide, ultrasonic disperse 18min,
It is then transferred in hydrothermal reaction kettle, heating is reacted, and is filtered, is first washed 3 times with dehydrated alcohol, then use deionization after cooling
Water washing 3 times, it is then dried in vacuo 16h at 78 DEG C, then ground, lithium titanate is made and coats iron borate lithium particle；Each original
The parts by weight of material are, 4 parts by weight of nano-titanium dioxide, 37 parts by weight of nano boric acid iron lithium, 2.8 parts by weight of lithium hydroxide, go from
Sub- 56.2 amount part of water；The temperature of hydro-thermal reaction is 168 DEG C, time 9.5h；The average grain diameter of nano-titanium dioxide is 18nm；It receives
The average grain diameter of rice iron borate lithium is 140nm；
(2) nanometer nickel pyrophosphate is added in deionized water, then dispersion liquid is sprayed, in step by ultrasonic disperse 28min
(1) lithium titanate made from coats iron borate lithium particle surface and deposits a coke charge nickel phosphate, and single layer is made and coats iron borate lithium/coke phosphorus
Sour nickel composite granules；The parts by weight of each raw material are 19 parts by weight of nanometer nickel pyrophosphate, 54 parts by weight of deionized water, lithium titanate packet
Cover 27 parts by weight of iron borate lithium particle；The average grain diameter of nanometer nickel pyrophosphate is 90nm；
(3) organosilicon polymer is added in n-hexane, stirs to being completely dissolved, is then added made from step (2) compound
Grain, is uniformly mixed, then heating removes solvent hexane at 80 DEG C, and organosilicon polymer is made to be coated on composite particles table
Double-coating iron borate lithium/nickel pyrophosphate composite particles are made in face；Organosilicon polymer is fluorine silicone rubber；Silicon rubber is raw rubber；
The parts by weight of each raw material are 1.9 parts by weight of organosilicon polymer, 60.1 parts by weight of n-hexane, 38 parts by weight of composite particles；Stirring
Speed be 450r/min, time 2h.
Embodiment 4
(1) nano-titanium dioxide, nano boric acid iron lithium are added in the deionized water solution of lithium hydroxide, ultrasonic disperse 10min,
It is then transferred in hydrothermal reaction kettle, heating is reacted, and is filtered, is first washed 2 times with dehydrated alcohol, then use deionization after cooling
Water washing 2 times, it is then dried in vacuo 20h at 70 DEG C, then ground, lithium titanate is made and coats iron borate lithium particle；Each original
The parts by weight of material are, 3 parts by weight of nano-titanium dioxide, 30 parts by weight of nano boric acid iron lithium, 2.5 parts by weight of lithium hydroxide, go from
Sub- 64.5 parts by weight of water；The temperature of hydro-thermal reaction is 160 DEG C, time 11h；The average grain diameter of nano-titanium dioxide is 10nm；
The average grain diameter of nano boric acid iron lithium is 100nm；
(2) nanometer nickel pyrophosphate is added in deionized water, then dispersion liquid is sprayed, in step by ultrasonic disperse 20min
(1) lithium titanate made from coats iron borate lithium particle surface and deposits a coke charge nickel phosphate, and single layer is made and coats iron borate lithium/coke phosphorus
Sour nickel composite granules；The parts by weight of each raw material are 15 parts by weight of nanometer nickel pyrophosphate, 65 parts by weight of deionized water, lithium titanate packet
Cover 20 parts by weight of iron borate lithium particle；The average grain diameter of nanometer nickel pyrophosphate is 50nm；
(3) organosilicon polymer is added in n-hexane, stirs to being completely dissolved, is then added made from step (2) compound
Grain, is uniformly mixed, then heating removes solvent hexane at 80 DEG C, and organosilicon polymer is made to be coated on composite particles table
Double-coating iron borate lithium/nickel pyrophosphate composite particles are made in face；Organosilicon polymer is methyl silicone rubber；Silicon rubber is made a living
Glue；The parts by weight of each raw material are 1.5 parts by weight of organosilicon polymer, 68.5 parts by weight of n-hexane, 30 parts by weight of composite particles；
The speed of stirring is 300r/min, time 3h.
Embodiment 5
(1) nano-titanium dioxide, nano boric acid iron lithium are added in the deionized water solution of lithium hydroxide, ultrasonic disperse 20min,
It is then transferred in hydrothermal reaction kettle, heating is reacted, and is filtered, is first washed 3 times with dehydrated alcohol, then use deionization after cooling
Water washing 3 times, it is then dried in vacuo 15h at 80 DEG C, then ground, lithium titanate is made and coats iron borate lithium particle；Each original
The parts by weight of material are 4 parts by weight of nano-titanium dioxide, 40 parts by weight of nano boric acid iron lithium, 3 parts by weight of lithium hydroxide, deionization
53 parts by weight of water；The temperature of hydro-thermal reaction is 170 DEG C, time 9h；The average grain diameter of nano-titanium dioxide is 20nm；Nanometer boron
The average grain diameter of sour iron lithium is 150nm；
(2) nanometer nickel pyrophosphate is added in deionized water, then dispersion liquid is sprayed, in step by ultrasonic disperse 30min
(1) lithium titanate made from coats iron borate lithium particle surface and deposits a coke charge nickel phosphate, and single layer is made and coats iron borate lithium/coke phosphorus
Sour nickel composite granules；The parts by weight of each raw material are 20 parts by weight of nanometer nickel pyrophosphate, 50 parts by weight of deionized water, lithium titanate packet
Cover 30 parts by weight of iron borate lithium particle；The average grain diameter of nanometer nickel pyrophosphate is 100nm；
(3) organosilicon polymer is added in n-hexane, stirs to being completely dissolved, is then added made from step (2) compound
Grain, is uniformly mixed, then heating removes solvent hexane at 80 DEG C, and organosilicon polymer is made to be coated on composite particles table
Double-coating iron borate lithium/nickel pyrophosphate composite particles are made in face；Organosilicon polymer is methyl vinyl silicone rubber；Silicon rubber
Glue is raw rubber；The parts by weight of each raw material are 2 parts by weight of organosilicon polymer, 58 parts by weight of n-hexane, 40 weight of composite particles
Part；The speed of stirring is 500r/min, time 2h.
Embodiment 6
(1) nano-titanium dioxide, nano boric acid iron lithium are added in the deionized water solution of lithium hydroxide, ultrasonic disperse 15min,
It is then transferred in hydrothermal reaction kettle, heating is reacted, and is filtered, is first washed 3 times with dehydrated alcohol, then use deionization after cooling
Water washing 2 times, it is then dried in vacuo 18h at 75 DEG C, then ground, lithium titanate is made and coats iron borate lithium particle；Each original
The parts by weight of material are that 3.5 parts by weight of nano-titanium dioxide, 2.8 parts by weight of lithium hydroxide, are gone at 35 parts by weight of nano boric acid iron lithium
58.7 parts by weight of ionized water；The temperature of hydro-thermal reaction is 165 DEG C, time 10h；The average grain diameter of nano-titanium dioxide is
15nm；The average grain diameter of nano boric acid iron lithium is 125nm；
(2) nanometer nickel pyrophosphate is added in deionized water, then dispersion liquid is sprayed, in step by ultrasonic disperse 25min
(1) lithium titanate made from coats iron borate lithium particle surface and deposits a coke charge nickel phosphate, and single layer is made and coats iron borate lithium/coke phosphorus
Sour nickel composite granules；The parts by weight of each raw material are 18 parts by weight of nanometer nickel pyrophosphate, 57 parts by weight of deionized water, lithium titanate packet
Cover 25 parts by weight of iron borate lithium particle；The average grain diameter of nanometer nickel pyrophosphate is 80nm；
(3) organosilicon polymer is added in n-hexane, stirs to being completely dissolved, is then added made from step (2) compound
Grain, is uniformly mixed, then heating removes solvent hexane at 80 DEG C, and organosilicon polymer is made to be coated on composite particles table
Double-coating iron borate lithium/nickel pyrophosphate composite particles are made in face；Organosilicon polymer is fluorine silicone rubber；Silicon rubber is raw rubber；
The parts by weight of each raw material are 1.8 parts by weight of organosilicon polymer, 63.2 parts by weight of n-hexane, 35 parts by weight of composite particles；Stirring
Speed be 400r/min, time 2.5h.
Comparative example 1
Single layer cladding is carried out to iron borate lithium/nickel pyrophosphate only with lithium titanate, other preparation conditions and embodiment 6 are consistent.
Comparative example 2
Single layer cladding, other preparation conditions and embodiment 6 one are carried out to iron borate lithium/nickel pyrophosphate only with organosilicon polymer
It causes.
Performance test:
Positive plate is made in positive electrode produced by the present invention, using Celgard2400 microporous polypropylene membrane as diaphragm, 1mol/L's
LiPF6Mixed organic solvents (EC:DMC=1:1, volume ratio) be electrolyte, be that argon gas is being full of to pole piece with metal lithium sheet
Glove box in be assembled into the button cell of model CR2025, carry out following test:
(1) electronic conductivity, ionic conductivity: after carrying out electrochemistry circulation 1 week using LandCT2001A battery test system,
With the electrochemical impedance of Zahner IM6ex type electrochemical workstation measurement material, measurement frequency range is 10kHz ~ 10mHz,
Perturbation voltage is 5mV, tests and calculate the electronic conductivity and ionic conductivity of positive electrode；
(2) charge and discharge cycles test specific capacity: carrying out charge and discharge cycles test, charging/discharging voltage using battery performance testing system
Range is 2 ~ 4V, respectively will head of the test battery in air exposure 0d, 1d and 5d, test air after exposure under 0.5C multiplying power
Secondary, 50 weeks charging and discharging capacities of circulation.
The data obtained is as shown in table 1.
Table 1:
Claims (9)
1. double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery preparation method, which is characterized in that the lithium battery
Specific step is as follows for positive electrode preparation:
(1) nano-titanium dioxide, nano boric acid iron lithium are added in the deionized water solution of lithium hydroxide, ultrasonic disperse 10 ~
20min is then transferred in hydrothermal reaction kettle, and heating is reacted, and is filtered after cooling, is first washed 2 ~ 3 times with dehydrated alcohol, then
It is washed with deionized 2 ~ 3 times, 15 ~ 20h is then dried in vacuo at 70 ~ 80 DEG C, then ground, lithium titanate Boron Coated is made
Sour iron lithium particle；
(2) nanometer nickel pyrophosphate being added in deionized water, then dispersion liquid is sprayed by 20 ~ 30min of ultrasonic disperse,
The cladding iron borate lithium particle surface one coke charge nickel phosphate of deposition of lithium titanate made from step (1), obtained single layer cladding iron borate lithium/
Nickel pyrophosphate composite particles；
(3) organosilicon polymer is added in n-hexane, stirs to being completely dissolved, is then added made from step (2) compound
Grain, is uniformly mixed, then heating removes solvent hexane at 80 DEG C, and organosilicon polymer is made to be coated on composite particles table
Double-coating iron borate lithium/nickel pyrophosphate composite particles are made in face.
2. double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery preparation method according to claim 1, special
Sign is: the parts by weight of step (1) each raw material are 3 ~ 4 parts by weight of nano-titanium dioxide, 30 ~ 40 weight of nano boric acid iron lithium
Measure part, 2.5 ~ 3 parts by weight of lithium hydroxide, 53 ~ 64.5 parts by weight of deionized water.
3. double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery preparation method according to claim 1, special
Sign is: the temperature of step (1) described hydro-thermal reaction is 160 ~ 170 DEG C, and the time is 9 ~ 11h.
4. double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery preparation method according to claim 1, special
Sign is: the parts by weight of step (2) each raw material are 15 ~ 20 parts by weight of nanometer nickel pyrophosphate, 50 ~ 65 weight of deionized water
Part, lithium titanate coat 20 ~ 30 parts by weight of iron borate lithium particle.
5. double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery preparation method according to claim 1, special
Sign is: step (3) organosilicon polymer be methyl silicone rubber, methyl vinyl silicone rubber, in fluorine silicone rubber at least
It is a kind of；The silicon rubber is raw rubber.
6. double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery preparation method according to claim 1, special
Sign is: the parts by weight of step (3) each raw material are 1.5 ~ 2 parts by weight of organosilicon polymer, 58 ~ 68.5 weight of n-hexane
Part, 30 ~ 40 parts by weight of composite particles.
7. double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery preparation method according to claim 1, special
Sign is: the speed of step (3) described stirring is 300 ~ 500r/min, and the time is 2 ~ 3h.
8. double-coating iron borate lithium/nickel pyrophosphate anode material of lithium battery preparation method according to claim 1, special
Sign is:
The average grain diameter of the nano-titanium dioxide is 10 ~ 20nm；
The average grain diameter of the nano boric acid iron lithium is 100 ~ 150nm；
The average grain diameter of the nanometer nickel pyrophosphate is 50 ~ 100nm.
9. double-coating iron borate lithium/nickel pyrophosphate lithium battery that any one of claim 1 ~ 8 preparation method is prepared
Positive electrode.
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