CN215008323U - High-voltage lithium ion battery - Google Patents
High-voltage lithium ion battery Download PDFInfo
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- CN215008323U CN215008323U CN202120198029.0U CN202120198029U CN215008323U CN 215008323 U CN215008323 U CN 215008323U CN 202120198029 U CN202120198029 U CN 202120198029U CN 215008323 U CN215008323 U CN 215008323U
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 89
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 44
- 239000000463 material Substances 0.000 claims abstract description 43
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 34
- 239000002131 composite material Substances 0.000 claims abstract description 33
- 239000007773 negative electrode material Substances 0.000 claims abstract description 32
- 239000007774 positive electrode material Substances 0.000 claims abstract description 26
- 239000000126 substance Substances 0.000 claims abstract description 21
- 239000011149 active material Substances 0.000 claims abstract description 17
- 239000002153 silicon-carbon composite material Substances 0.000 claims abstract description 14
- YZSKZXUDGLALTQ-UHFFFAOYSA-N [Li][C] Chemical compound [Li][C] YZSKZXUDGLALTQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011572 manganese Substances 0.000 claims abstract description 13
- PNUGDRJNKILROY-UHFFFAOYSA-N [C].[Si].[Li] Chemical compound [C].[Si].[Li] PNUGDRJNKILROY-UHFFFAOYSA-N 0.000 claims abstract description 12
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 claims abstract description 3
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- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
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- 229910021385 hard carbon Inorganic materials 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
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- SIMMHEMKEKUZMB-UHFFFAOYSA-N [C].[Si](=O)=O.[Li] Chemical compound [C].[Si](=O)=O.[Li] SIMMHEMKEKUZMB-UHFFFAOYSA-N 0.000 claims description 2
- JTUOUVKWCBYKBS-UHFFFAOYSA-N [Li].[Si]=O.[C] Chemical compound [Li].[Si]=O.[C] JTUOUVKWCBYKBS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000012876 carrier material Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 6
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- 239000003792 electrolyte Substances 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 4
- 229910009055 Li1.2Ni0.2Mn0.6O2 Inorganic materials 0.000 description 3
- 229910004956 Li10SiP2S12 Inorganic materials 0.000 description 3
- 229910002984 Li7La3Zr2O12 Inorganic materials 0.000 description 3
- 239000010405 anode material Substances 0.000 description 3
- 239000007770 graphite material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002203 sulfidic glass Substances 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910009178 Li1.3Al0.3Ti1.7(PO4)3 Inorganic materials 0.000 description 2
- 229910003405 Li10GeP2S12 Inorganic materials 0.000 description 2
- 229910010848 Li6PS5Cl Inorganic materials 0.000 description 2
- 229910011201 Li7P3S11 Inorganic materials 0.000 description 2
- 229910002099 LiNi0.5Mn1.5O4 Inorganic materials 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910010252 TiO3 Inorganic materials 0.000 description 2
- ZYXUQEDFWHDILZ-UHFFFAOYSA-N [Ni].[Mn].[Li] Chemical compound [Ni].[Mn].[Li] ZYXUQEDFWHDILZ-UHFFFAOYSA-N 0.000 description 2
- XRNHBMJMFUBOID-UHFFFAOYSA-N [O].[Zr].[La].[Li] Chemical compound [O].[Zr].[La].[Li] XRNHBMJMFUBOID-UHFFFAOYSA-N 0.000 description 2
- WFOSTBQBOVBVLG-UHFFFAOYSA-N [Si].[P].[S].[Li] Chemical compound [Si].[P].[S].[Li] WFOSTBQBOVBVLG-UHFFFAOYSA-N 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 229910000664 lithium aluminum titanium phosphates (LATP) Inorganic materials 0.000 description 2
- BDKWOJYFHXPPPT-UHFFFAOYSA-N lithium dioxido(dioxo)manganese nickel(2+) Chemical compound [Mn](=O)(=O)([O-])[O-].[Ni+2].[Li+] BDKWOJYFHXPPPT-UHFFFAOYSA-N 0.000 description 2
- 229910000614 lithium tin phosphorous sulfides (LSPS) Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 229920005569 poly(vinylidene fluoride-co-hexafluoropropylene) Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000002200 LIPON - lithium phosphorus oxynitride Substances 0.000 description 1
- 239000005279 LLTO - Lithium Lanthanum Titanium Oxide Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- VSTOHTVURMFCGL-UHFFFAOYSA-N [C].O=[Si]=O Chemical compound [C].O=[Si]=O VSTOHTVURMFCGL-UHFFFAOYSA-N 0.000 description 1
- WNLXKBDXIAGXQA-UHFFFAOYSA-N [Cl].[P].[S].[Li] Chemical compound [Cl].[P].[S].[Li] WNLXKBDXIAGXQA-UHFFFAOYSA-N 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- PAHNBNDPQWLRQX-UHFFFAOYSA-N [N].[O].[P].[Li] Chemical compound [N].[O].[P].[Li] PAHNBNDPQWLRQX-UHFFFAOYSA-N 0.000 description 1
- QHTCLUNVAUTDBT-UHFFFAOYSA-N [O-2].[Ti+4].[Mn+2].[Li+] Chemical compound [O-2].[Ti+4].[Mn+2].[Li+] QHTCLUNVAUTDBT-UHFFFAOYSA-N 0.000 description 1
- CDRPLTDFKBZLPZ-UHFFFAOYSA-N [S].[Ge].[P].[Li] Chemical compound [S].[Ge].[P].[Li] CDRPLTDFKBZLPZ-UHFFFAOYSA-N 0.000 description 1
- FQBJEOBTOBNOOV-UHFFFAOYSA-N [S].[P].[Li] Chemical compound [S].[P].[Li] FQBJEOBTOBNOOV-UHFFFAOYSA-N 0.000 description 1
- NCZAACDHEJVCBX-UHFFFAOYSA-N [Si]=O.[C] Chemical compound [Si]=O.[C] NCZAACDHEJVCBX-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- CVJYOKLQNGVTIS-UHFFFAOYSA-K aluminum;lithium;titanium(4+);phosphate Chemical compound [Li+].[Al+3].[Ti+4].[O-]P([O-])([O-])=O CVJYOKLQNGVTIS-UHFFFAOYSA-K 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910000659 lithium lanthanum titanates (LLT) Inorganic materials 0.000 description 1
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- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
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Classifications
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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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- Secondary Cells (AREA)
Abstract
The utility model relates to a battery technology field, concretely relates to high voltage lithium ion battery. The lithium ion battery comprises a positive electrode material layer, a solid electrolyte layer, a lithium ion buffer layer and a negative electrode material layer which are sequentially arranged between a positive electrode current collector and a negative electrode current collector. The active material in the positive electrode material layer is a lithium-rich manganese-based material and/or a lithium nickel manganese oxide material, and the negative electrode material layer is a simple substance lithium material, a lithium-carbon composite material or a lithium-silicon-carbon composite material. The utility model discloses a battery has 4.9V stable cycle's the cut-off voltage that charges, is greater than 350wh kg's quality energy density, is the trend of future high performance lithium ion battery development.
Description
The technical field is as follows:
the utility model belongs to the technical field of a battery technique and specifically relates to a high voltage lithium ion battery.
(II) background technology:
at present, commercial lithium ion batteries mainly comprise lithium iron phosphate batteries, ternary lithium ion batteries, lithium titanate batteries, lithium manganate batteries and lithium cobaltate batteries, and high-voltage lithium ion battery systems with the charge and discharge voltages of the positive electrode materials of the batteries below 4.5V and above 4.8V always have market blanks.
The commercial and leading-edge lithium ion battery has a use voltage generally lower than 4.5V and a market rate of the lithium ion battery with a charge-discharge voltage greater than 4.8V is almost zero, which is a problem to be solved urgently. If the electrolyte adopting the high-pressure resistant additive is developed, the electrolyte in a liquid state is unsafe to circulate with a battery adopting elemental lithium as a negative electrode layer, lithium dendrite is easy to appear, and the SEI film can be continuously formed and decomposed in the battery circulating process by using graphite or silicon material as the negative electrode layer, so that the electrochemical performance is extremely poor.
The lithium-rich manganese-based material and the nickel lithium manganate material have a charging voltage of 4.9V, a material system does not contain or contains a very small amount of cobalt element, a voltage platform in the charging and discharging process is high, the gram specific capacity of the material is high, and the material is a positive electrode material with a relatively good cost performance, but is influenced by the low oxidation-reduction potential of a commercial electrolyte system, when the charging voltage of a lithium ion battery is more than 4.6V, the interface of a positive electrode material layer and the electrolyte is unstable, the electrolyte is seriously decomposed, the cycle life of a high-voltage battery system is rapidly shortened, and finally the battery fails.
(III) contents of the utility model:
the utility model aims to solve the technical problem that a high voltage lithium ion battery is provided.
The technical scheme of the utility model:
the utility model provides a high voltage lithium ion battery, its anodal mass flow body is including anodal material layer, solid electrolyte layer, lithium ion buffer layer and the negative pole material layer that sets gradually between the negative pole mass flow body, active material in the anodal material layer is rich lithium manganese base material or nickel lithium manganate material, active material in the negative pole material layer is simple substance lithium material, lithium carbon composite or lithium silicon carbon composite.
Preferably, in the high-voltage lithium ion battery, the lithium-rich manganese-based material is Li1.2Ni0.135Co0.135Mn0.54O2、 Li1.2Ni0.2Mn0.6O2Or Li1.2Ti0.4Mn0.4O2。
Preferably, in the above high-voltage lithium ion battery, the solid electrolyte layer is one or more of an oxide solid electrolyte, a sulfide solid electrolyte, a gel solid electrolyte and a polymer solid electrolyte.
Preferably, in the above high-voltage lithium ion battery, the oxide solid electrolyte is Li7La3Zr2O12(LLZO), lithium phosphorus oxygen nitrogen (LiPON), Li1.3Al0.3Ti1.7(PO4)3(LATP) or Li0.34La0.567TiO3(LLTO); the sulfide solid electrolyte is Li7P3S11(LPS)、Li10GeP2S12(LGPS)、Li10SiP2S12(LSPS) or Li6PS5Cl; the gel solid electrolyte is PVDF-HFP base, PVA-CN base or TEGDME G4 base; the polymer solid electrolyte is PEO-based, PVDF-based, PMMA-based or PAN-based.
The corresponding component materials of the compound are as follows:
| Li1.2Ni0.135Co0.135Mn0.54O2 | lithium-rich manganese-based nickel cobalt lithium manganate |
| Li1.2Ni0.2Mn0.6O2 | Lithium-rich manganese-based lithium nickel manganese oxide |
| Li1.2Ti0.4Mn0.4O2 | Lithium-rich manganese-based lithium titanium manganese oxide |
| Li7La3Zr2O12 | Lithium lanthanum zirconium oxygen base solid electrolyte |
| Li1.3Al0.3Ti1.7(PO4)3 | Lithium aluminum titanium phosphate-based solid electrolyte |
| Li0.34La0.567TiO3 | Lithium lanthanum titanate-based solid electrolyte |
| Li7P3S11 | Lithium phosphorus sulfur-based solid electrolyte |
| Li10GeP2S12 | Lithium germanium phosphorus sulfur based solid electrolyte |
| Li10SiP2S12 | Lithium silicon phosphorus sulfur based solid electrolyte |
| Li6PS5Cl | Lithium phosphorus sulfur chlorine-based solid electrolyte |
Preferably, in the high-voltage lithium ion battery, the lithium-carbon composite material is a simple substance lithium-graphite composite material, a simple substance lithium-hard carbon composite material or a simple substance lithium-soft carbon composite material.
Preferably, in the high-voltage lithium ion battery, the lithium-silicon-carbon composite material is an elemental lithium-elemental silicon-carbon composite material, an elemental lithium-silicon monoxide-carbon composite material or an elemental lithium-silicon dioxide-carbon composite material.
Preferably, in the high-voltage lithium ion battery, the active material in the lithium ion buffer layer is a silver-carbon carrier composite material, wherein the carbon carrier material is carbon black, graphene or carbon nanotubes.
Preferably, in the high-voltage lithium ion battery, the thickness of the positive electrode material layer is 10 to 500 μm, the thickness of the solid electrolyte layer is 5 to 50 μm, and the thickness of the lithium ion buffer layer is 0.2 to 10 μm.
Preferably, in the high-voltage lithium ion battery, the negative electrode material layer is a simple substance lithium material layer, and the thickness of the negative electrode material layer is 1-50 μm.
Preferably, in the high-voltage lithium ion battery, the thickness of the elemental lithium material layer in the lithium-carbon composite material is 0.5 to 30 μm, and the thickness of the carbon material layer (graphite material layer, hard carbon material layer or soft carbon material layer) is 1 to 300 μm.
Preferably, in the high-voltage lithium ion battery, the thickness of the elemental lithium material layer in the lithium silicon carbon composite material is 0.5 to 30 μm, and the thickness of the silicon carbon material layer (the elemental silicon carbon material layer, the silicon monoxide carbon material layer or the silicon dioxide carbon material layer) is 1 to 300 μm.
The utility model has the advantages that:
according to the high-voltage lithium ion battery, the positive electrode material layer, the solid electrolyte layer, the lithium ion buffer layer and the negative electrode material layer are sequentially arranged between the positive electrode current collector and the negative electrode current collector, the lithium ion buffer layer can effectively adjust the uniform deposition of lithium ions on the negative electrode material layer, the lithium dendrite phenomenon is relieved, and the long-life cycle stability and the safety of the high-voltage lithium ion battery are realized; the battery has the charge cut-off voltage of 4.9V stable cycle by selecting specific materials, so that the cycle stability of the high-voltage lithium ion battery can be improved (the number of 1C/1C charge-discharge cycles is more than 1000), the energy density of the high-voltage lithium ion battery is increased (the mass energy density can be more than 350wh/kg), and the development trend of the high-performance lithium ion battery in the future is realized.
(IV) description of the drawings:
FIG. 1: the negative electrode material layer is a structural schematic diagram of a high-voltage lithium ion battery made of elemental lithium materials;
FIG. 2: the negative electrode material layer is a structural schematic diagram of a high-voltage lithium ion battery made of a lithium-carbon composite material;
FIG. 3: the negative electrode material layer is a structural schematic diagram of a high-voltage lithium ion battery made of a lithium-carbon composite material;
FIG. 4: the negative electrode material layer is a structural schematic diagram of a high-voltage lithium ion battery made of a lithium silicon carbon composite material;
FIG. 5: the negative electrode material layer is a structural schematic diagram of the high-voltage lithium ion battery made of the lithium silicon carbon composite material.
In the figure: 1-positive electrode material layer 2-solid electrolyte layer 3-negative electrode material layer 4-lithium ion buffer layer
5-elemental lithium material layer 6-carbon material layer 7-silicon carbon material layer
(V) specific embodiment:
example 1
As shown in fig. 1, a high-voltage lithium ion battery includes a positive electrode material layer 1, a solid electrolyte layer 2, a lithium ion buffer layer 4 and a negative electrode material layer 3 sequentially arranged between a positive electrode current collector and a negative electrode current collector, wherein the thickness of the positive electrode material layer 1 is 500 μm, the thickness of the solid electrolyte layer 2 is 50 μm, the thickness of the lithium ion buffer layer 4 is 10 μm, the thickness of the negative electrode material layer 3 is 50 μm, and an active material in the positive electrode material layer 1 is Li rich in lithium manganese base1.2Ni0.135Co0.135Mn0.54O2(LR-NCM) and the material of the solid electrolyte layer 2 is an oxide solid electrolyte Li7La3Zr2O12(LLZO, lithium lanthanum zirconium oxygen), the negative electrode material layer 3 is an elemental lithium material layer 5, the thickness of the elemental lithium material layer 5 is 50 μm, and the active material in the lithium ion buffer layer 4 is a silver-carbon black carrier composite material. When the charging voltage of the high-voltage lithium ion battery reaches 4.9V, the electrochemical performance is stable, the mass energy density of the high-voltage lithium ion battery is more than 350wh/kg, the 1C/1C charging and discharging cycle frequency is more than 1000, and the capacity retention rate is 80%.
Example 2
As shown in FIG. 2, the positive electrode of the high-voltage lithium ion battery is collectedThe lithium ion battery comprises a positive electrode material layer 1, a solid electrolyte layer 2, a lithium ion buffer layer 4 and a negative electrode material layer 3 which are sequentially arranged from a body to a negative electrode current collector, wherein the thickness of the positive electrode material layer 1 is 10 mu m, the thickness of the solid electrolyte layer 2 is 5 mu m, the thickness of the lithium ion buffer layer 4 is 0.2 mu m, the thickness of the negative electrode material layer 3 is 1.5 mu m, and an active material in the positive electrode material layer 1 is rich in lithium manganese Li1.2Ni0.2Mn0.6O2(LR-NM) of the solid electrolyte layer 2, the material of which is a sulfide solid electrolyte Li10SiP2S12(LSPS, lithium silicon phosphorus sulfur), the negative electrode material layer 3 is a lithium-carbon composite material layer, the lithium-carbon composite material layer is a simple substance lithium-graphite composite material and consists of a simple substance lithium material layer 5 and a carbon material layer 6 (specifically, a graphite material layer), the thickness of the simple substance lithium material layer 5 is 0.5 μm, the thickness of the carbon material layer 6 is 1 μm, and the active material in the lithium ion buffer layer 4 is a silver-graphene carrier composite material. When the charging voltage of the high-voltage lithium ion battery reaches 4.9V, the electrochemical performance is stable, the mass energy density of the high-voltage lithium ion battery is more than 350wh/kg, the 1C/1C charging and discharging cycle number is more than 1100, and the capacity retention rate is 80%.
Example 3
As shown in fig. 3, a high-voltage lithium ion battery includes a positive electrode material layer 1, a solid electrolyte layer 2, a lithium ion buffer layer 4 and a negative electrode material layer 3 sequentially arranged between a positive electrode current collector and a negative electrode current collector, where the thickness of the positive electrode material layer 1 is 400 μm, the thickness of the solid electrolyte layer 2 is 15 μm, the thickness of the lithium ion buffer layer 4 is 1 μm, the thickness of the negative electrode material layer 3 is 330 μm, and an active material in the positive electrode material layer 1 is lithium nickel manganese LiNi0.5Mn1.5O4(LNMO), the material of the solid electrolyte layer 2 is an oxide solid electrolyte lithium phosphorus oxynitride (LiPON), the negative electrode material layer 3 is a lithium-carbon composite material layer, the lithium-carbon composite material layer is composed of an elemental lithium material layer 5 and a carbon material layer 6 (specifically, a hard carbon material layer), the thickness of the elemental lithium material layer 5 is 30 μm, the thickness of the carbon material layer 6 is 300 μm, and the active material in the lithium ion buffer layer 4 is a silver-carbon nanotube carrier composite material. Said heightWhen the charging voltage of the high-voltage lithium ion battery reaches 4.9V, the electrochemical performance is stable, the mass energy density of the high-voltage lithium ion battery is more than 350wh/kg, the 1C/1C charging and discharging cycle number is more than 1200, and the capacity retention rate is 80%.
Example 4
As shown in fig. 4, the high-voltage lithium ion battery includes a positive electrode material layer 1, a solid electrolyte layer 2, a lithium ion buffer layer 4 and a negative electrode material layer 3 sequentially arranged between a positive electrode current collector and a negative electrode current collector. The thickness of the positive electrode material layer 1 is 500 mu m, the thickness of the solid electrolyte layer 2 is 20 mu m, the thickness of the lithium ion buffer layer 4 is 5 mu m, the thickness of the negative electrode material layer 3 is 330 mu m, and the active material in the positive electrode material layer 1 is lithium nickel manganese LiNi0.5Mn1.5O4(LNMO), the solid electrolyte layer 2 is made of a gel solid electrolyte PVDF-HFP base, the negative electrode material layer 3 is a lithium silicon carbon composite material layer, the lithium silicon carbon composite material layer is composed of a simple substance lithium material layer 5 and a silicon carbon material layer 7 (specifically, a silicon oxide (SiOx) carbon material layer), the thickness of the simple substance lithium material layer 5 is 30 μm, the thickness of the silicon carbon material layer 7 is 300 μm, and the active material in the lithium ion buffer layer 4 is a silver-carbon black carrier composite material. When the charging voltage of the high-voltage lithium ion battery reaches 4.9V, the electrochemical performance is stable, the mass energy density of the high-voltage lithium ion battery is more than 350wh/kg, the 1C/1C charging and discharging cycle frequency is more than 1000, and the capacity retention rate is 80%.
Example 5
As shown in fig. 5, the high-voltage lithium ion battery includes a positive electrode material layer 1, a solid electrolyte layer 2, a lithium ion buffer layer 4 and a negative electrode material layer 3 sequentially arranged between a positive electrode current collector and a negative electrode current collector. The thickness of the positive electrode material layer 1 is 40 mu m, the thickness of the solid electrolyte layer 2 is 10 mu m, the thickness of the lithium ion buffer layer 4 is 2 mu m, the thickness of the negative electrode material layer 3 is 1.5 mu m, and the active material in the positive electrode material layer 1 is rich lithium manganese Li1.2Ti0.4Mn0.4O2(LR-TM), the material of the solid electrolyte layer 2 is PVDF-based polymer solid electrolyte, and the negative electrode material layer 3 is a lithium silicon carbon composite material layerThe composite material layer is composed of a simple substance lithium material layer 5 and a silicon carbon material layer 7 (specifically, a simple substance silicon carbon material layer), the thickness of the simple substance lithium material layer 5 is 0.5 μm, the thickness of the silicon carbon material layer 7 is 1 μm, and the active material in the lithium ion buffer layer 4 is a silver-carbon nanotube carrier composite material. When the charging voltage of the high-voltage lithium ion battery reaches 4.9V, the electrochemical performance is stable, the mass energy density of the high-voltage lithium ion battery is more than 350wh/kg, the 1C/1C charging and discharging cycle frequency is more than 1000, and the capacity retention rate is 80%.
In summary, the high-voltage lithium ion battery provided by the utility model selects the high-voltage cobalt-free or low-cobalt anode material layer, and solves the problems of anode material cost and high energy density; the high-voltage solid electrolyte layer is selected, so that the problem of circulation stability of the lithium ion battery under high potential is solved, the oxidation-reduction potential of the solid electrolyte is higher, the side reactions of the interface of the anode material layer and the solid electrolyte layer and the interface of the cathode material layer and the solid electrolyte layer can be reduced, and the safety of the lithium ion battery is improved; the lithium composite material is selected as the negative electrode material layer, so that the volume energy density and the mass energy density of the lithium ion battery can be improved, and the development trend of the future high-performance lithium ion battery is realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A high voltage lithium ion battery, characterized by: the lithium ion battery comprises a positive electrode material layer, a solid electrolyte layer, a lithium ion buffer layer and a negative electrode material layer which are sequentially arranged between a positive electrode current collector and a negative electrode current collector, wherein an active material in the positive electrode material layer is a lithium-rich manganese-based material or a lithium nickel manganese oxide material, and an active material in the negative electrode material layer is a simple substance lithium material, a lithium-carbon composite material or a lithium-silicon-carbon composite material.
2. The high voltage lithium ion battery of claim 1, wherein: the lithium-carbon composite material is a simple substance lithium-graphite composite material, a simple substance lithium-hard carbon composite material or a simple substance lithium-soft carbon composite material.
3. The high voltage lithium ion battery of claim 1, wherein: the lithium silicon carbon composite material is an elemental lithium-elemental silicon carbon composite material, an elemental lithium-silicon monoxide carbon composite material or an elemental lithium-silicon dioxide carbon composite material.
4. The high voltage lithium ion battery of claim 1, wherein: the active material in the lithium ion buffer layer is a silver-carbon carrier composite material, wherein the carbon carrier material is carbon black, graphene or carbon nano tubes.
5. The high voltage lithium ion battery of claim 1, wherein: the thickness of the positive electrode material layer is 10-500 mu m, the thickness of the solid electrolyte layer is 5-50 mu m, and the thickness of the lithium ion buffer layer is 0.2-10 mu m.
6. The high voltage lithium ion battery of claim 1, wherein: the thickness of the negative electrode material layer is 1-50 μm when the negative electrode material layer is a simple substance lithium material layer.
7. The high voltage lithium ion battery of claim 1, wherein: the thickness of a simple substance lithium material layer in the lithium-carbon composite material is 0.5-30 mu m, and the thickness of a carbon material layer is 1-300 mu m; the thickness of the simple substance lithium material layer in the lithium silicon carbon composite material is 0.5-30 mu m, and the thickness of the silicon carbon material layer is 1-300 mu m.
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