CN100397699C - A lithium ion secondary battery - Google Patents
A lithium ion secondary battery Download PDFInfo
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- CN100397699C CN100397699C CNB2004100520233A CN200410052023A CN100397699C CN 100397699 C CN100397699 C CN 100397699C CN B2004100520233 A CNB2004100520233 A CN B2004100520233A CN 200410052023 A CN200410052023 A CN 200410052023A CN 100397699 C CN100397699 C CN 100397699C
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Abstract
The present invention relates to a lithium ion secondary battery which comprises an anode, a membrane, a cathode and non-aqueous electrolyte, wherein the anode is composed of an active substance coating of the anode, coated on an electricity collecting body of the anode and capable of being inserted and releasing lithium, and the cathode is composed of an active substance coating of the cathode, coated on an electricity collecting body of the cathode and capable of being inserted and releasing the lithium. The weight of active substances of the anode is divided by the volume of the active substances of the anode to obtain the volumetric density of the anode coating of 1.80 g/cm 3 to smaller than 3.50 g/cm 3, and the weight of active substances of the cathode is divided by the volume of the active substances of the cathode to obtain the volumetric density of the cathode coating of larger than 1.20 g/cm 3 to smaller than 1.70 g/cm 3. The lithium ion secondary battery of the present invention has the characteristics of large magnification and excellent discharge performance.
Description
Technical field
The present invention relates to a kind of lithium rechargeable battery, particularly relate to a kind of lithium rechargeable battery that can effectively improve big multiplying power discharging property.
Background technology
Lithium rechargeable battery is since nineteen ninety succeeds in developing, since its have specific energy height, operating voltage height, self-discharge rate low, have extended cycle life, advantage such as pollution-free, progressively replaced traditional nickel every alkaline secondary cells such as, ni-mhs, at modern mobile electronic device and communication apparatus, as having obtained extensive use in mobile phone, notebook computer, Hand Personal Computer, PDA(Personal Digital Assistant), small-sized camera, digital camera, portable DVD player/VCD and the MP3 player.
But in widely used electric tool and electronic toy field, as the battery of energy resource supply still based on traditional nickel every with alkaline secondary cells such as Ni-MH battery.Reason is, electric tool and electronic toy require can repid discharge, just requires must have good big multiplying power discharging property as the battery of energy resource supply.It is the electrolyte system of solvent that nickel adopts with water every alkaline secondary cells such as, ni-mhs, and lithium rechargeable battery is because the voltage height, and water solution system can not adapt to the needs of battery, must adopt the non-aqueous solution electrolysis liquid system; The conductivity of non-aqueous solution electrolysis liquid system can not show a candle to the conductivity of water solution system.Therefore, general lithium rechargeable battery can only satisfy the 1C-3C multiplying power discharging property, can't satisfy the above big multiplying power discharging property of the desired 8C of electric tool and electronic toy.
On the other hand, part electric tool and electronic toy in the evolution of portable day by day, miniaturization, the secondary cell that an urgent demand operating weight energy density and volume energy density are more excellent.Therefore, improve lithium rechargeable battery big multiplying power discharging property, to satisfy the development need of portable power tool and electronic toy, become the problem of research.
Lithium rechargeable battery is when charging, and lithium ion takes off embedding from the interlayer of the anodal oxide with layer structure that positive plate applies, and arrives negative plate by barrier film between the positive/negative plate and electrolyte, embeds the interlayer of the material with carbon element with layer structure; When discharge, lithium ion takes off embedding from the interlayer of the material with carbon element with layer structure that negative plate applies, and arrives positive plate by barrier film between the positive/negative plate and electrolyte, embeds the interlayer of the anodal oxide with layer structure.Positive/negative plate is connected with electric line with extraneous with lug by collector, when discharge, form loop current, deviate from from the negative pole carbon-coating in formed size of current and unit interval, be directly proportional by barrier film and electrolyte and the lithium ion number that embeds the interlayer of anodal oxide.When big multiplying power discharging, lithium ion many times when to take off the number of embedding and embedding be normal multiplying power discharging in the unit interval.As the 8C multiplying power discharging, to take off the number of embedding and embedding be 8 times of normal 1C multiplying power discharging to lithium ion in the unit interval.Under the unmodifiable situation of non-aqueous solution electrolysis liquid system, a kind of effective ways that increase substantially the big multiplying power discharging property of lithium rechargeable battery are to create a kind of long-pending structure of pole piece utmost point stockpile that lithium ion takes off embedding and embedding that helps by the optimal design of pole piece.When discharge, lithium ion takes off embedding from negative plate, embeds at positive plate, and this moment, the long-pending structure of utmost point stockpile of positive plate was big to the discharge performance influence.In addition, lithium ion is also influential to discharge performance from the path length that negative plate takes off the embedding process, and the path is short more, helps discharge more.
Conventional lithium-ion secondary battery positive plate dressing bulk density of the prior art is 3.50g/cm
3To 3.80g/cm
3, negative plate dressing bulk density is 1.00g/cm
3To 1.20g/cm
3, the weight percentage of conductive agent is 2-3% in the dressing of positive plate.The problem that this conventional design exists is:
(1) positive plate dressing bulk density is bigger than normal, piles up closely as the anodal oxide particle of active material, is unfavorable for the embedding of a large amount of lithium ions in the short time when discharge, and big multiplying power discharging has been produced harmful effect.
(2) negative plate dressing bulk density is less than normal, under the situation of identical carbon material used as anode coating amount, pole piece thickness is thick partially, the distance that causes lithium ion to deviate from process from the interlayer of material with carbon element is big, what be unfavorable for interior a large amount of lithium ions of short time takes off embedding from negative plate, arrive positive plate, big multiplying power discharging has been produced harmful effect.
(3) content of conductive agent is on the low side in the dressing of positive plate, is semiconductor as the lithium oxide of positive active material, and when big multiplying power discharging, the conductor deficiency has produced harmful effect to big multiplying power discharging.
Summary of the invention
The technical problem to be solved in the present invention aims to provide a kind of improved lithium rechargeable battery, to improve the big multiplying power discharging property of lithium rechargeable battery.
For solving the problems of the technologies described above, the invention provides a kind of lithium rechargeable battery, it comprises positive pole, barrier film, negative pole and nonaqueous electrolytic solution, described positive pole disengages the positive active material coating of lithium and constitutes by being coated in embedding on the positive electrode collector, described negative pole disengages the negative electrode active material coating of lithium and constitutes by being coated in embedding on the negative electrode collector, wherein, the weight of described positive active material divided by the volume of positive active material coating calculate anodal coating bulk density be 1.80g/cm
3Extremely less than 3.50g/cm
3, the weight of described negative electrode active material divided by the volume of negative electrode active material coating calculate negative pole coating bulk density for greater than 1.20g/cm
3Extremely less than 1.70g/cm
3
More preferred, the weight of described positive active material divided by the volume of positive active material coating calculate anodal coating bulk density be 2.3g/cm
3To 3.3g/cm
3The weight of described negative electrode active material divided by the volume of negative electrode active material coating calculate negative pole coating bulk density for greater than 1.25g/cm
3To 1.50g/cm
3
Also can further contain the conductive agent that weight percentage is 3-15% in the described positive active material, preferred weight percentage is 5-10%.
Described positive active material is not particularly limited, and can disengage the positive active material of lithium for embedding of this area routine, at least a such as in lithium and cobalt oxides, lithium nickel oxide and the lithium manganese oxide, preferred lithium cobalt/cobalt oxide LiCoO
2
Described negative electrode active material is not particularly limited, and can disengage the negative electrode active material of lithium for embedding of this area routine, at least a such as in native graphite, Delanium and the coke, preferred natural graphite.
Described conductive agent is not particularly limited, and can be the anodal conductive agent of this area routine, at least a such as in acetylene black, conductive carbon black and the electrically conductive graphite, preferred acetylene black.
Described electrolyte is not particularly limited, and can be the nonaqueous electrolytic solution of this area routine, preferably by by electrolytic salt lithium hexafluoro phosphate LiPF
6With the concentration of formations such as non-aqueous solvent dimethyl carbonate EC, ethylene carbonate DEC, carbonic acid diene ester DMC be the nonaqueous electrolyte of 1M.
Described barrier film and positive and negative electrode collector body are not particularly limited, and can be barrier film and positive and negative electrode collector body conventional in the lithium rechargeable battery, barrier film preferred polyolefm micro-porous film, the preferred aluminium foil of positive electrode collector, the preferred Copper Foil of negative electrode collector.
Compared with prior art, contribution of the present invention is to efficiently solve the big multiplying power discharging problem of lithium rechargeable battery:
(1) positive plate dressing bulk density is less, piles up as the anodal oxide particle of active material and loosens, and helps the embedding of a large amount of lithium ions in the short time.
(2) negative plate dressing bulk density is bigger, under the situation of identical carbon material used as anode coating amount, and the pole piece thinner thickness, the distance that makes lithium ion deviate from process from the interlayer of material with carbon element is shorter, helps the embedding of taking off of a large amount of lithium ions in the short time.
(3) content of conductive agent is higher in the dressing of positive plate, when big multiplying power discharging, has remedied lithium oxide conductor defect of insufficient, has guaranteed good big multiplying power discharging property.
Description of drawings
Fig. 1 is the stacked polymer lithium ion secondary battery schematic diagram of the embodiment of the invention 1.
Fig. 2 is the takeup type square lithium ion secondary battery schematic diagram of the embodiment of the invention 2.
Fig. 3 is the winding flexible packing lithium ionic secondary cell schematic diagram of the embodiment of the invention 3.
Fig. 4 is the stacked flexible packing lithium ion secondary battery schematic diagram of the embodiment of the invention 4.
Embodiment
The following example is to further explanation of the present invention and explanation, and the present invention is not constituted any limitation.
LiCoO
2(lithium and cobalt oxides) 100 parts, 4 parts of acetylene black conductive agents, 7 parts of PVDF (polyvinylidene fluoride) binding agents, NMP (n-formyl sarcolysine base pyrrolidones) solvent mix and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the short-movie shape of 52*32mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 3.45g/cm
3, the conductive agent weight percentage is 3.6% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the short-movie shape of 53*32mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.50g/cm
3 Negative plate 2.
Polymer dielectric film 3, positive plate 1 and negative plate 2 are stacked into the core body that outside dimension is 3.2*33*55mm by the order of polymer dielectric film/positive plate/polymer dielectric film/negative plate.
The package compound film with PET polyester/NY nylon/AL aluminium foil/CPP hydrostomia polypropylene multi-layer structure that is made of macromolecule membrane and metal forming is struck out the shell 4 that has the 3.5*33*55mm groove, above-mentioned core body is put into shell, inject then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through encapsulation, change into, operation such as partial volume, the capacity of obtaining is 700mAh, outside dimension is the structure polymer lithium ion secondary battery as shown in Figure 1 of 3.8*35*62mm.
100 parts of lithium and cobalt oxides, 8 parts of acetylene black conductive agents, 7 parts of PVDF polyvinylidene fluoride binding agents, NMP n-formyl sarcolysine base pyrrolidones solvent are mixed and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the strip of 52*360mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 2.70g/cm
3, the conductive agent weight percentage is 7.0% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the strip of 53*325mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.22g/cm
3 Negative plate 2.
Be wound into the core body that outside dimension is 3.2*33*55mm after PE/PP barrier film 3, positive plate 1 and negative plate 2 stacked by the order of barrier film/negative plate/barrier film/positive plate.
Above-mentioned core body is put in the aluminum metal case that outside dimension is 3.8*35*57mm, injected then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through sealing, change into, operation such as partial volume, the capacity of obtaining is 500mAh, outside dimension is a 3.8*35*57mm structure square lithium ion secondary battery as shown in Figure 2.
100 parts of lithium and cobalt oxides, 18 parts of acetylene black conductive agents, 7 parts of PVDF polyvinylidene fluoride binding agents, NMP n-formyl sarcolysine base pyrrolidones solvent are mixed and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the strip of 52*360mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 1.80g/cm
3, the conductive agent weight percentage is 14.4% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the strip of 53*325mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.65g/cm
3 Negative plate 2.
Be wound into the core body that outside dimension is 3.2*33*55mm after PE/PP barrier film 3, positive plate 1 and negative plate 2 stacked successively by the order of barrier film/negative plate/barrier film/positive plate.
The package compound film with PET polyester/NY nylon/AL aluminium foil/CPP hydrostomia polypropylene multi-layer structure that is made of macromolecule membrane and metal forming is struck out the shell 4 that has the 3.5*33*55mm groove, above-mentioned core body is put into shell, inject then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through encapsulation, change into, operation such as partial volume, the capacity of obtaining is 440mAh, outside dimension is the flexible packing lithium ion secondary battery of 3.8*35*62mm takeup type structure as shown in Figure 3.
100 parts of lithium and cobalt oxides, 8 parts of acetylene black conductive agents, 7 parts of PVDF polyvinylidene fluoride binding agents, NMP n-formyl sarcolysine base pyrrolidones solvent are mixed and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the short-movie shape of 52*32mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 2.70g/cm
3, the conductive agent weight percentage is 7.0% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the short-movie shape of 53*32mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.50g/cm
3 Negative plate 2.
PE/PP barrier film 3, positive plate 1 and negative plate 2 are stacked into the core body that outside dimension is 3.2*33*55mm by the order of barrier film/positive plate/barrier film/negative plate.
The package compound film with PET polyester/NY nylon/AL aluminium foil/CPP hydrostomia polypropylene multi-layer structure that is made of macromolecule membrane and metal forming is struck out the shell 4 that has the 3.5*33*55mm groove, above-mentioned core body is put into shell, inject then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through encapsulation, change into, operation such as partial volume, the capacity of obtaining is 600mAh, outside dimension is the flexible packing lithium ion secondary battery of 3.8*35*62mm laminated structure as shown in Figure 4.
Embodiment 5
100 parts of lithium and cobalt oxides, 12 parts of acetylene black conductive agents, 7 parts of PVDF polyvinylidene fluoride binding agents, NMP n-formyl sarcolysine base pyrrolidones solvent are mixed and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the strip of 41*360mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 2.30g/cm
3, the conductive agent weight percentage is 10.0% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the strip of 42*365mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.35g/cm
3 Negative plate 2.
Being wound into diameter after PE/PP barrier film 3, positive plate 1 and negative plate 2 stacked by the order of barrier film/positive plate/barrier film/negative plate is 13.3mm, highly is the cylindrical core body of 44mm.
Above-mentioned core body is put into diameter 14.3mm, highly is in the cylindrical steel of 50mm, injects then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through sealing, change into, operation such as partial volume, the capacity of obtaining is the cylindrical lithium ion secondary battery of 500mAh.
Comparative example 1
100 parts of lithium and cobalt oxides, 2.5 parts of acetylene black conductive agents, 7 parts of PVDF polyvinylidene fluoride binding agents, NMP n-formyl sarcolysine base pyrrolidones solvent are mixed and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the short-movie shape of 52*32mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 3.65g/cm
3, the conductive agent weight percentage is 2.3% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the short-movie shape of 53*32mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.15g/cm
3 Negative plate 2.
Polymer dielectric film 3, positive plate 1 and negative plate 2 are stacked into the core body that outside dimension is 3.2*33*55mm by the order of polymer dielectric film/positive plate/polymer dielectric film/negative plate.
The package compound film with PET polyester/NY nylon/AL aluminium foil/CPP hydrostomia polypropylene multi-layer structure that is made of macromolecule membrane and metal forming is struck out the shell 4 that has the 3.5*33*55mm groove, above-mentioned core body is put into shell, inject then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through encapsulation, change into, operation such as partial volume, the capacity of obtaining is 600mAh, outside dimension is the polymer lithium ion secondary battery of 3.8*35*62mm.
Comparative example 2
100 parts of lithium and cobalt oxides, 2.5 parts of acetylene black conductive agents, 7 parts of PVDF polyvinylidene fluoride binding agents, NMP n-formyl sarcolysine base pyrrolidones solvent are mixed and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the strip of 52*360mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 3.60g/cm
3, the conductive agent weight percentage is 2.3% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the strip of 53*325mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.10g/cm
3 Negative plate 2.
Be wound into the core body that outside dimension is 3.2*33*55mm after PE/PP barrier film 3, positive plate 1 and negative plate 2 stacked by the order of barrier film/negative plate/barrier film/positive plate.
Above-mentioned core body is put in the aluminum metal case that outside dimension is 3.8*35*57mm, injected then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through sealing, change into, operation such as partial volume, the capacity of obtaining is 660mAh, outside dimension is the square lithium ion secondary battery of 3.8*35*57mm.
Comparative example 3
100 parts of lithium and cobalt oxides, 2.5 parts of acetylene black conductive agents, 7 parts of PVDF polyvinylidene fluoride binding agents, NMP n-formyl sarcolysine base pyrrolidones solvent are mixed and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the strip of 52*360mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 3.50g/cm
3, the conductive agent weight percentage is 2.3% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the strip of 53*325mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.00g/cm
3 Negative plate 2.
Be wound into the core body that outside dimension is 3.2*33*55mm after PE/PP barrier film 3, positive plate 1 and negative plate 2 stacked successively by the order of barrier film/negative plate/barrier film/positive plate.
The package compound film with PET polyester/NY nylon/AL aluminium foil/CPP hydrostomia polypropylene multi-layer structure that is made of macromolecule membrane and metal forming is struck out the shell 4 that has the 3.5*33*55mm groove, above-mentioned core body is put into shell, inject then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through encapsulation, change into, operation such as partial volume, the capacity of obtaining is 570mAh, outside dimension is the flexible packing lithium ion secondary battery of the takeup type structure of 3.8*35*62mm.
Comparative example 4
100 parts of lithium and cobalt oxides, 2.5 parts of acetylene black conductive agents, 7 parts of PVDF polyvinylidene fluoride binding agents, NMP n-formyl sarcolysine base pyrrolidones solvent are mixed and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the short-movie shape of 52*32mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 3.75g/cm
3, the conductive agent weight percentage is 2.3% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the short-movie shape of 53*32mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.20g/cm
3 Negative plate 2.
PE/PP barrier film 3, positive plate 1 and negative plate 2 are stacked into the core body that outside dimension is 3.2*33*55mm by the order of barrier film/positive plate/barrier film/negative plate.
The package compound film with PET polyester/NY nylon/AL aluminium foil/CPP hydrostomia polypropylene multi-layer structure that is made of macromolecule membrane and metal forming is struck out the shell 4 that has the 3.5*33*55mm groove, above-mentioned core body is put into shell, inject then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through encapsulation, change into, operation such as partial volume, the capacity of obtaining is 750mAh, outside dimension is the flexible packing lithium ion secondary battery of the laminated structure of 3.8*35*62mm.
Comparative example 5
100 parts of lithium and cobalt oxides, 2.5 parts of acetylene black conductive agents, 7 parts of PVDF polyvinylidene fluoride binding agents, NMP n-formyl sarcolysine base pyrrolidones solvent are mixed and heat and stir companion's form slurry for 60 parts, be coated on the thick aluminium foil of 0.02mm two surfaces, after removing nmp solvent, baking cuts into the strip of 41*360mm. and it is thick to be pressed into 130 μ m at last, and making the dressing bulk density is 3.70g/cm
3, the conductive agent weight percentage is 2.3% positive plate 1.
100 parts of native graphites, 10 parts of PVDF binding agents, nmp solvent are mixed and heat and stir companion's form slurry for 100 parts, be coated on the thick Copper Foil of 0.012mm two surfaces, after removing nmp solvent, baking cuts into the strip of 42*365mm. and it is thick to be pressed into 140 μ m at last, and making the dressing bulk density is 1.05g/cm
3 Negative plate 2.
Being wound into diameter after PE/PP barrier film 3, positive plate 1 and negative plate 2 stacked by the order of barrier film/positive plate/barrier film/negative plate is 13.3mm, highly is the cylindrical core body of 44mm.
Above-mentioned core body is put into diameter 14.3mm, highly is in the cylindrical steel of 50mm, injects then by electrolytic salt LiPF
6The concentration that (lithium hexafluoro phosphate) and nonaqueous solvents EC (dimethyl carbonate), DEC (ethylene carbonate) and DMC (carbonic acid diene ester) constitute is the nonaqueous electrolyte of 1M.At last through sealing, change into, operation such as partial volume, the capacity of obtaining is the cylindrical lithium ion secondary battery of 640mAh.
Ten kinds of batteries that make with said method are carried out big multiplying power discharging test respectively.Method of testing is as follows:
Used the 1C constant-current constant-voltage charging cashier's office in a shop 2.5 hours at the lithium electrical testing, charging upper limit 4.2V.After shelving 30 minutes, discharge into 3.0V with 0.2C, 3C, 5C, 8C respectively, record discharge capacity, and the ratio of calculating and 0.2C discharge capacity.
Test result sees the following form:
| Nominal capacity (mAh) | 0.2C discharge capacity (mAh) | 3C discharge capacity (mAh) | 5C discharge capacity (mAh) | 8C discharge capacity (mAh) | 3C/0.2C | 5C/0.2C | 8C/0.2 | |
| Embodiment | ||||||||
| 1 | 700 | 718 | 596 | 539 | 445 | 83％ | 75％ | 62 |
| Embodiment | ||||||||
| 2 | 500 | 516 | 475 | 454 | 423 | 92％ | 88％ | 82 |
| Embodiment | ||||||||
| 3 | 440 | 452 | 434 | 425 | 402 | 96％ | 94％ | 89 |
| Embodiment | ||||||||
| 4 | 600 | 621 | 578 | 559 | 534 | 93％ | 90％ | 86％ |
| Embodiment 5 | 500 | 517 | 491 | 476 | 450 | 95％ | 92％ | 87％ |
| Comparative example 1 | 600 | 622 | 404 | 156 | 19 | 65％ | 25％ | 3％ |
| Comparative example 2 | 660 | 669 | 522 | 274 | 54 | 78％ | 41％ | 8％ |
| Comparative example 3 | 570 | 587 | 493 | 282 | 65 | 84％ | 48％ | 11％ |
| Comparative example 4 | 750 | 765 | 551 | 291 | 54 | 72％ | 38％ | 7％ |
| Comparative example 5 | 640 | 660 | 462 | 224 | 33 | 70％ | 34％ | 5％ |
From above-mentioned test result as can be seen:
Embodiments of the invention 1 to embodiment 5 are owing to optimize in the weight percentage design of design of positive/negative plate dressing bulk density and positive plate conductive agent, thereby particularly are better than comparative example 1 greatly to comparative example 5 aspect the big multiplying power discharging property of 8C at multiplying power discharging property greatly.
Optimal design of the present invention is applied in the polymer lithium ion secondary battery of embodiment 1, the square lithium ion secondary battery of embodiment 2, the cylindrical lithium ion secondary battery of the winding flexible packing lithium ionic secondary cell of embodiment 3, the stacked flexible packing lithium ion secondary battery of embodiment 4 and embodiment 5 has all obtained good big multiplying power discharging property.
Optimal design of the present invention is applied in the stacked core lithium rechargeable battery of embodiment 1 and embodiment 4, and the takeup type core lithium rechargeable battery of embodiment 2, embodiment 3, embodiment 5, has all obtained good big multiplying power discharging property.
To sum up, lithium rechargeable battery of the present invention, big multiplying power discharging property is good.
Claims (10)
1. lithium rechargeable battery, it comprises positive pole, barrier film, negative pole and nonaqueous electrolytic solution, described positive pole disengages the positive active material coating of lithium and constitutes by being coated in embedding on the positive electrode collector, described negative pole disengages the negative electrode active material coating of lithium and constitutes by being coated in embedding on the negative electrode collector, it is characterized in that, the weight of described positive active material divided by the volume of positive active material coating calculate anodal coating bulk density be 1.80g/cm
3Extremely less than 3.50g/cm
3, the weight of described negative electrode active material divided by the volume of negative electrode active material coating calculate negative pole coating bulk density for greater than 1.20g/cm
3Extremely less than 1.70g/cm
3
2. lithium rechargeable battery as claimed in claim 1 is characterized in that, described anodal coating bulk density is 2.3g/cm
3To 3.3g/cm
3
3. lithium rechargeable battery as claimed in claim 1 or 2 is characterized in that, described negative pole coating bulk density is greater than 1.25g/cm
3To 1.50g/cm
3
4. lithium rechargeable battery as claimed in claim 1 is characterized in that, also contains the conductive agent that weight percentage is 3-15% in the described positive active material.
5. lithium rechargeable battery as claimed in claim 3 is characterized in that, also contains the conductive agent that weight percentage is 3-15% in the described negative electrode active material.
6. lithium rechargeable battery as claimed in claim 4 is characterized in that, the weight percentage of described conductive agent in positive active material is 5-10%.
7. lithium rechargeable battery as claimed in claim 1 is characterized in that, described positive active material contains at least a in lithium and cobalt oxides, lithium nickel oxide and the lithium manganese oxide.
8. lithium rechargeable battery as claimed in claim 1 is characterized in that, described negative electrode active material contains at least a in native graphite, Delanium and the coke.
9. as claim 4 or 5 described lithium rechargeable batteries, it is characterized in that described conductive agent comprises at least a in acetylene black, conductive carbon black and the electrically conductive graphite.
10. as each described lithium rechargeable battery of claim 7-8, it is characterized in that described lithium rechargeable battery is takeup type structure or laminated structure.
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|---|---|---|---|
| CNB2004100520233A CN100397699C (en) | 2004-10-30 | 2004-10-30 | A lithium ion secondary battery |
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| CNB2004100520233A CN100397699C (en) | 2004-10-30 | 2004-10-30 | A lithium ion secondary battery |
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| CN1767253A CN1767253A (en) | 2006-05-03 |
| CN100397699C true CN100397699C (en) | 2008-06-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103119774B (en) * | 2010-09-22 | 2016-01-20 | 丰田自动车株式会社 | Rechargeable nonaqueous electrolytic battery |
| JP2014238958A (en) * | 2013-06-07 | 2014-12-18 | オートモーティブエナジーサプライ株式会社 | Nonaqueous battery |
| CN114606538B (en) * | 2022-01-24 | 2023-10-03 | 湘潭大学 | Waste lead plaster recycling method |
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| JP2002203556A (en) * | 2000-12-28 | 2002-07-19 | Sony Corp | Non-aqueous electrolyte secondary battery |
| CN1372341A (en) * | 2001-02-23 | 2002-10-02 | 三洋电机株式会社 | Lithium secondary cell |
| CN1457110A (en) * | 2002-05-08 | 2003-11-19 | 索尼公司 | Non-aqueous electrolyte cell |
| JP2004265792A (en) * | 2003-03-03 | 2004-09-24 | Sony Corp | Battery |
| CN1534818A (en) * | 2003-03-31 | 2004-10-06 | 佳能株式会社 | Lithium secondary cell |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002203556A (en) * | 2000-12-28 | 2002-07-19 | Sony Corp | Non-aqueous electrolyte secondary battery |
| CN1372341A (en) * | 2001-02-23 | 2002-10-02 | 三洋电机株式会社 | Lithium secondary cell |
| CN1457110A (en) * | 2002-05-08 | 2003-11-19 | 索尼公司 | Non-aqueous electrolyte cell |
| JP2004265792A (en) * | 2003-03-03 | 2004-09-24 | Sony Corp | Battery |
| CN1534818A (en) * | 2003-03-31 | 2004-10-06 | 佳能株式会社 | Lithium secondary cell |
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