CN102544578B - Lithium ion battery capable of improving comprehensive performance - Google Patents
Lithium ion battery capable of improving comprehensive performance Download PDFInfo
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- CN102544578B CN102544578B CN201210069816.0A CN201210069816A CN102544578B CN 102544578 B CN102544578 B CN 102544578B CN 201210069816 A CN201210069816 A CN 201210069816A CN 102544578 B CN102544578 B CN 102544578B
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Abstract
The invention discloses a lithium ion battery capable of improving the comprehensive performance. The lithium ion battery comprises a battery electric core, wherein the battery electric core comprises a cathode piece, an anode piece, an electrolyte and a diaphragm, wherein the cathode piece comprises a cathode current collector; a layer of cathode slurry is coated on the surface of the cathode current collector; the anode piece comprises an anode current collector; and anode slurry is coated on the surfaces of the upper side and the lower side of the anode current collector respectively. According to the lithium ion battery capable of improving the comprehensive performance, the whole performance, such as the safety performance and the environment performance, of the battery can be improved by flexibly coating organic system anode slurry and water solvent system anode slurry on the upper side and the lower side of the anode current collector of the electric core, so that the using safety of the battery is improved greatly, and the market application prospect of products of a battery production factory is improved; and the lithium ion battery has a significance for production practicability.
Description
Technical field
The present invention relates to battery technology field, particularly relate to a kind of lithium ion battery that can improve combination property.
Background technology
In the last few years, along with the fast development of portable electric appts, power supply was had higher requirement.Lithium rechargeable battery has the advantages such as voltage is high, specific capacity is large, self discharge is little, lightweight, without memory and enjoys favor, not only on portable electric appts as mobile phone, Digital Video and laptop computer are used widely, and be widely used in the big-and-middle-sized electrical equipment aspects such as electric automobile, electric bicycle and electric tool.
At present, lithium rechargeable battery generally comprises battery core, integrated circuit board and battery external packing, and battery battery core is comprised of positive pole, negative pole, electrolyte, barrier film and battery case cap.Wherein, positive pole is generally comprised of transition metal oxide, conductive agent, binding agent; Negative pole is generally by two kinds of composing systems: a kind of is carbon, conductive agent, organic system binding agent, and another kind is carbon, conductive agent, aqueous solvent binding agent; Barrier film is comprised of polypropylene PP, polythene PE; Electrolyte is comprised of electrolyte and organic solvent.
For battery battery core, from the angle of negative pole, organic system negative pole has good, low temperature resistant good, the feature such as resistance is little of caking property, but the inferior position existing has, cost is high, organic solvent pollution environment; Aqueous solvent negative pole has the features such as capacity is high, cost is low, thermal discharge is few, but caking property is poor, resistance is large.
Therefore the overall performance that, how further to improve battery just becomes the problem of current solution.
Summary of the invention
In view of this, the object of this invention is to provide a kind of lithium ion battery that can improve combination property, it can be by being coated with respectively and using respectively organic system cathode size and aqueous solvent cathode size in the both sides up and down of battery core negative plate collector neatly, thereby be conducive to improve the overall performance of battery, as security performance and environmental performance, greatly improve the safety in utilization of battery, and then improve the market application foreground of battery production producer product, be of great practical significance.
For this reason, the invention provides a kind of lithium ion battery that can improve combination property, include battery battery core, described battery battery core includes positive plate, negative plate, electrolyte and barrier film;
Described positive plate includes a plus plate current-collecting body, and described plus plate current-collecting body surface-coated has one deck anode sizing agent;
Described negative plate includes a negative current collector, and the upper and lower both side surface of described negative current collector is coated with respectively cathode size;
Described cathode size includes negative electrode active material, conductive agent, binding agent and solvent, and wherein, described negative electrode active material comprises at least one in native graphite, Delanium and carbonaceous mesophase spherules; Described conductive agent includes at least one in carbon black, carbon nano-tube, acetylene black, electrically conductive graphite and Graphene; Described binding agent is Kynoar PVDF or styrene butadiene rubber sbr; Described solvent is N, N dimethyl pyrrolidone NMP or water.
Wherein, the top of described negative current collector is formed with long face 11, and the bottom of described negative current collector is formed with short facial 12, and the length of described long face 11 is greater than short facial 12 length;
Wherein, described electrolyte includes electrolytic salt and organic solvent, and wherein, described electrolytic salt includes lithium hexafluoro phosphate LiPF
6and/or lithium perchlorate LiClO
4; Described organic solvent includes at least one in dimethyl carbonate DMC, diethyl carbonate DEC, methyl ethyl carbonate EMC, ethylene carbonate EC and vinylene carbonate VC.
Wherein, described plus plate current-collecting body is aluminium foil, and described anode sizing agent includes positive active material, carbon-based material conductive agent, binding agent and solvent, and wherein, described positive active material includes cobalt acid lithium LiCoO
2, ternary compound oxides nickle cobalt lithium manganate LiNi
1/3co
1/3mn
1/3o
2with LiMn2O4 LiMn
2o
4at least one, described conductive agent includes at least one in carbon black, carbon nano-tube, acetylene black, electrically conductive graphite and Graphene, described binding agent is Kynoar PVDF, described solvent is N, N dimethyl pyrrolidone NMP.
Wherein, described positive active material is cobalt acid lithium LiCoO
2, described cobalt acid lithium LiCoO
2, the weight ratio between conductive agent and Kynoar PVDF is 94:3:3.
Wherein, facial 11 surface-coateds of the length of described negative current collector 1 have one deck organic system cathode size, and short facial 12 surface-coateds of described negative current collector 1 have one deck aqueous solvent cathode size.
Wherein, the negative electrode active material that described organic system cathode size comprises is Delanium, the binding agent that described organic system cathode size comprises is Kynoar PVDF, the solvent that described organic system cathode size comprises is N, N dimethyl pyrrolidone NMP, and the weight ratio between described Delanium, conductive agent and Kynoar PVDF is 94:3:3.
Wherein, it is characterized in that, the negative electrode active material that described aqueous solvent cathode size comprises is native graphite, and the binding agent that described aqueous solvent cathode size comprises is styrene butadiene rubber sbr, and the solvent that described aqueous solvent cathode size comprises is water;
In described aqueous solvent cathode size, also include sanlose CMC;
Weight ratio between described native graphite, conductive agent, sanlose CMC and styrene butadiene rubber sbr is: 94:3:1:2.
From above technical scheme provided by the invention, compared with prior art, the invention provides a kind of lithium ion battery that can improve combination property, it can be cathode size and aqueous solvent cathode size by being coated with respectively epiorganism in the both sides up and down of battery core negative plate collector neatly, thereby be conducive to improve the overall performance of battery, as security performance and environmental performance, greatly improve the safety in utilization of battery, and then the market application foreground of raising battery production producer product, be of great practical significance.
accompanying drawing explanation
Fig. 1 is the structural representation sketch of negative plate in a kind of lithium ion battery that can improve combination property provided by the invention;
Fig. 2 for using the properties contrast form schematic diagram of four kinds of lithium ion batteries of made of the present invention in four embodiment;
Fig. 3 be take respectively mode that charging voltage is 1A as 5V, charging current while overcharging, the indicatrix schematic diagram of battery charge and cell voltage for four kinds of lithium ion batteries that use made of the present invention in four embodiment;
Fig. 4 for using four kinds of lithium ion batteries of made of the present invention to arrive 4.2V with the current charges of 1C respectively in four embodiment, then constant voltage charge current cut-off is to 0.05C, when the hot case of putting into again 150 degree carries out nature discharge test, the indicatrix schematic diagram of ambient temperature and cell voltage;
Fig. 5 for using four kinds of lithium ion batteries of made of the present invention to arrive 4.2V with the current charges of 1C rate of charge respectively in four embodiment, then the draw point that uses 3 millimeters of thicknesses pierces through battery while carrying out lancing test, the indicatrix schematic diagram of the temperature of battery and voltage.
embodiment
In order to make those skilled in the art person understand better the present invention program, below in conjunction with drawings and embodiments, the present invention is described in further detail.
The invention provides a kind of lithium ion battery that can improve combination property, include battery battery core, described battery battery core is comprised of positive plate, negative plate, barrier film and battery case.
In the present invention, the battery battery core of described lithium ion battery includes positive plate, negative plate, electrolyte, barrier film, electrolyte and battery case, specifically by positive plate, negative plate and barrier film, by coiling, make battery core, in described battery battery core, be injected with electrolyte, this battery battery core, by entering shell, the weldering end, slot rolling, fluid injection, welding cap, sealing, thermal shrinkable sleeve, a plurality of technique such as infiltrating, change into, is finally made the lithium ion battery of finished product.
In the present invention, the electrolyte injecting in the battery core of described lithium ion battery includes electrolytic salt and organic solvent, and wherein, described electrolytic salt can be for including lithium hexafluoro phosphate (LiPF
6) and/or lithium perchlorate (LiClO
4); Described organic solvent can include at least one in dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), ethylene carbonate (EC) and vinylene carbonate (VC).
In the present invention, described positive plate includes a plus plate current-collecting body, and described plus plate current-collecting body surface-coated has one deck anode sizing agent;
In specific implementation, described plus plate current-collecting body can be aluminium foil, and described anode sizing agent includes positive active material (major ingredient), carbon-based material conductive agent, binding agent and solvent.
Wherein, described positive active material (major ingredient) includes at least one phosphate metal lithium compound, for example, can be: include cobalt acid lithium LiCoO
2, ternary compound oxides nickle cobalt lithium manganate LiNi
1/3co
1/3mn
1/3o
2with LiMn2O4 LiMn
2o
4at least one; Described conductive agent (SP) can include at least one in carbon black, carbon nano-tube, acetylene black, electrically conductive graphite and Graphene; Binding agent for the described positive active material that bonds can be Kynoar (PVDF); Described solvent can be N, N dimethyl pyrrolidone (NMP).
In specific implementation, described positive active material is cobalt acid lithium LiCoO
2, described binding agent is Kynoar (PVDF), at this time, and described cobalt acid lithium LiCoO
2, the weight ratio between conductive agent (SP) and Kynoar (PVDF) is 94:3:3.
In the present invention, described negative plate includes a negative current collector, and the upper and lower both side surface of described negative current collector is coated with respectively cathode size;
In specific implementation, described negative current collector can for Copper Foil, metal lithium sheet, aluminum alloy sheet or containing the conducting polymer of lithium, described cathode size includes negative electrode active material (being major ingredient), conductive agent, binding agent and solvent.
Wherein, described negative electrode active material (being major ingredient) can be for comprising at least one in native graphite, Delanium and carbonaceous mesophase spherules; Described conductive agent can include at least one in carbon black, carbon nano-tube, acetylene black, electrically conductive graphite and Graphene; Binding agent for the described negative electrode active material that bonds can be Kynoar (PVDF) or styrene butadiene rubber sbr; Described solvent can be N, N dimethyl pyrrolidone (NMP) or be water.
In the present invention, in specific implementation, referring to Fig. 1, described negative plate includes negative current collector 1, the top of described negative current collector 1 is formed with long face 11, and the bottom of described negative current collector 1 is formed with short facial 12, and the length of described long face 11 is greater than short facial 12 length.
In the present invention, long face 11 and short facial 12 surfaces of described negative current collector 1 are only coated with respectively one deck organic system cathode size or aqueous solvent cathode size (being one deck negative electrode active material), and on described long face 11 and short facial 12, the cathode size of coating is not identical.
In specific implementation, the present invention is preferably: facial 11 surface-coateds of length of described negative current collector 1 have one deck organic system cathode size, and short facial 12 surface-coateds of described negative current collector 1 have one deck aqueous solvent cathode size.
It should be noted that, cathode size of the present invention comprises two kinds of organic system cathode size and aqueous solvent cathode sizes.
Wherein, the negative electrode active material that described organic system cathode size comprises is Delanium, the binding agent that described organic system cathode size comprises is Kynoar (PVDF), the solvent that described organic system cathode size comprises is N, N dimethyl pyrrolidone (NMP), described conductive agent can include at least one in carbon black, carbon nano-tube, acetylene black, electrically conductive graphite and Graphene.
In specific implementation, for described organic system cathode size, the weight ratio between described Delanium, conductive agent (SP) and Kynoar (PVDF) is 94:3:3.
Wherein, the negative electrode active material that described aqueous solvent cathode size comprises is native graphite, the binding agent that described aqueous solvent cathode size comprises is styrene butadiene rubber sbr, the solvent that described aqueous solvent cathode size comprises is water, and described conductive agent can include at least one in carbon black, carbon nano-tube, acetylene black, electrically conductive graphite and Graphene; In addition, also include sanlose (CMC) in described aqueous solvent cathode size, this CMC is used as thickener.
In specific implementation, for described aqueous solvent cathode size, the weight ratio between described native graphite, conductive agent (SP), sanlose (CMC) and styrene butadiene rubber sbr is: 94:3:1:2.
For the present invention, it should be noted that described lithium hexafluoro phosphate LiPF
6for solute, provide the medium of dissociated ion as lithium ion migration and charge transfer.Described dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), ethylene carbonate (EC) and vinylene carbonate (VC), can not only dissolved solid solute lithium hexafluoro phosphate LiPF as electrolyte solvent
6, and can form stable electrochemical system after blend, in various environment, guarantee the electrochemical stability of electrolyte system.
For a kind of lithium ion battery that can improve combination property provided by the invention, it not only can effectively guarantee the fail safe of battery, the combination property that battery can also be provided simultaneously, can well meet consumer to battery high security and high performance user demand.The present invention goes in all lithium ion batteries and lithium battery system.For example, go in the lithium rechargeable battery of the various ways such as square lithium ion battery, cylindrical lithium ion battery, polymer Li-ion battery.
A kind of each component that can improve the lithium ion battery of combination property providing based on the invention described above, illustrates specific performance and the effect of lithium ion battery of the present invention below by four specific embodiments.
Embodiment 1
1, the manufacturing process of positive plate: user uses solvent N, N dimethyl pyrrolidone (NMP) dissolves Kynoar (PVDF), then by LiCoO
2be distributed in the middle of this solvent with conductive agent SP, its part by weight is LiCoO
2︰ SP ︰ PVDF=94 ︰ 3 ︰ 3, mixing and stirring, obtain having the anode sizing agent of mobility, then this slurry is applied to uniformly on plus plate current-collecting body (as aluminium foil), as shown in Figure 1, then dry, make anode sizing agent on anode collection surface, form one deck positive electrode active material layer completely, finally prepare positive plate.
2, the manufacturing process of organic system cathode size: user uses solvent N, N dimethyl pyrrolidone (NMP) dissolves Kynoar (PVDF), then Delanium and conductive agent SP are distributed in the middle of this solvent, its part by weight is Delanium ︰ SP ︰ PVDF=94 ︰ 3 ︰ 3, then mixing and stirring, obtains having the organic system cathode size of mobility.
3, the manufacturing process of aqueous solvent cathode size: user adds native graphite, conductive agent SP, sanlose CMC, butylbenzene rubber SBR in aqueous solvent, part by weight between them is the right Shi Mo of Tian ︰ SP ︰ CMC ︰ SBR=94 ︰ 3 ︰ 1 ︰ 2, then mixing and stirring, obtains having the aqueous solvent cathode size of mobility.
4, the preparation process of anode plate for lithium ionic cell: the organic system cathode size preparing is above applied to the long face 11 at negative current collector (as Copper Foil) top uniformly, and aqueous solvent cathode size is applied in short facial 12 of negative current collector (as Copper Foil) bottom, as shown in Figure 1, then dry, make organic system cathode size and aqueous solvent cathode size in end face and the bottom surface of negative current collector, form respectively one deck negative electrode active material layer completely, finally prepare the negative plate of lithium ion battery of the present invention.
Finally the polyethylene membrane coil of the above-mentioned positive plate preparing, negative plate and 15um thickness is coiled into a square lithium ion battery battery core, then battery core is packed in the middle of battery case, and by LiPF
6be dissolved in the mixing material being comprised of EC, DMC and DEC, form electrolyte, wherein the weight ratio between EC, DMC and DEC is EC ︰ DMC ︰ DEC=1 ︰ 1 ︰ 1, and electrolyte is injected in battery case, is finally made into the square lithium ion battery of finished product.
The embodiment 1 using is basic identical with the method for embodiment 1, but short facial 12 coatings of the long face 11 at the top of negative current collector (Copper Foil) and bottom be organic system cathode size.
Embodiment 3
The embodiment 3 using is basic identical with the method for embodiment 1, but short facial 12 coatings of the long face 11 at the top of negative current collector (Copper Foil) and bottom be aqueous solvent cathode size.
Embodiment 4
The embodiment 4 using and the method for embodiment 1 are basic identical, but long face 11 coatings at the top of negative current collector (Copper Foil) is aqueous solvent cathode size, and what short facial 12 of negative current collector (Copper Foil) bottom was coated with is organic system cathode size.
In the present invention, for being well understood to the performance of lithium ion battery provided by the invention, by the performance for battery, by carrying out following five kinds of performance tests, the high-temperature storage performance of each embodiment lithium ion battery of comparative analysis, over-charging of battery electrical property, the hot case performance of battery, battery drop performance and battery acupuncture performance.Below concrete test.
1, high-temperature storage performance (85 ℃/5 hours).By four kinds of lithium ion batteries of above-mentioned making with the current charges of 1C to 4.2V, then constant voltage charge current cut-off is to 0.05C.Lithium ion battery is put into respectively in the middle of 85 ℃ of baking ovens, through storage in 5 hours, then put it into room temperature.Test its thickness and remaining battery capacity, see Fig. 2.
2, over-charging of battery electrical property.By four kinds of lithium ion batteries of above-mentioned making with the current charges of 1C to 4.2V, then constant voltage charge current cut-off is to 0.05C.Lithium ion battery is overcharged in 1A/5V mode respectively, if lithium ion battery do not smolder, missing of ignition, do not explode, by this test.The results are shown in Figure 2 and Fig. 3.
3, the hot case performance of battery.By four kinds of lithium ion batteries of above-mentioned making with the current charges of 1C to 4.2V, then constant voltage charge current cut-off is to 0.05C.Battery is put into respectively to 150 ℃ of hot casees and tests, until lithium ion battery lost efficacy, if lithium ion battery do not smolder, missing of ignition, do not explode, by this test.The results are shown in Figure 2 and Fig. 4.
4, battery drop performance.By four kinds of lithium ion batteries of above-mentioned making with the current charges of 1C to 4.2V, then constant voltage charge current cut-off is to 0.05C.Lithium ion battery is fallen in freely falling body mode from the height of 1.5m, test battery voltage, lithium ion battery is subject to no heating and drop number, the results are shown in Figure 2.
5, battery acupuncture performance.By four kinds of lithium ion batteries of above-mentioned making with the current charges of 1C to 4.2V, then constant voltage charge current cut-off is to 0.05C.Use the draw point of 3mm that lithium ion battery is pierced through and carries out lancing test, if lithium ion battery do not smolder, missing of ignition, do not explode, by this test.The results are shown in Figure 2 and Fig. 5.
Therefore, in sum, from the comparative analysis of embodiment 1 to 4, show lithium ion battery provided by the invention, by being coated with respectively epiorganism in the both sides up and down of battery core negative plate collector neatly, be cathode size and aqueous solvent cathode size, can have obviously promoted the overall performance of battery.
In sum, compared with prior art, a kind of lithium ion battery that can improve combination property provided by the invention, it can be cathode size and aqueous solvent cathode size by being coated with respectively epiorganism in the both sides up and down of battery core negative plate collector neatly, thereby be conducive to improve the overall performance of battery, as security performance and environmental performance, greatly improve the safety in utilization of battery, and then the market application foreground of raising battery production producer product, be of great practical significance.
Claims (7)
1. can improve a lithium ion battery for combination property, it is characterized in that, include battery battery core, described battery battery core includes positive plate, negative plate, electrolyte and barrier film;
Described positive plate includes a plus plate current-collecting body, and described plus plate current-collecting body surface-coated has one deck anode sizing agent;
Described negative plate includes a negative current collector, and the upper and lower both side surface of described negative current collector is coated with respectively cathode size;
Described cathode size includes negative electrode active material, conductive agent, binding agent and solvent, and wherein, described negative electrode active material comprises at least one in native graphite, Delanium and carbonaceous mesophase spherules; Described conductive agent includes at least one in carbon black, carbon nano-tube, acetylene black, electrically conductive graphite and Graphene; Described binding agent is Kynoar PVDF or styrene butadiene rubber sbr; Described solvent is N, N dimethyl pyrrolidone NMP or water;
The top of described negative current collector is formed with long face (11), and the bottom of described negative current collector is formed with short face (12), and the length of described long face (11) is greater than the length of short face (12);
Long face (11) and short face (12) surface of described negative current collector are coated with respectively one deck organic system cathode size or aqueous solvent cathode size, and the cathode size of described long face (11) and the upper coating of short face (12) is not identical.
2. lithium ion battery as claimed in claim 1, is characterized in that, described electrolyte includes electrolytic salt and organic solvent, and wherein, described electrolytic salt includes lithium hexafluoro phosphate LiPF
6and/or lithium perchlorate LiClO
4; Described organic solvent includes at least one in dimethyl carbonate DMC, diethyl carbonate DEC, methyl ethyl carbonate EMC, ethylene carbonate EC and vinylene carbonate VC.
3. lithium ion battery as claimed in claim 1, it is characterized in that, described plus plate current-collecting body is aluminium foil, and described anode sizing agent includes positive active material, carbon-based material conductive agent, binding agent and solvent, wherein, described positive active material includes cobalt acid lithium LiCoO
2, ternary compound oxides nickle cobalt lithium manganate LiNi
1/3co
1/3mn
1/3o
2with LiMn2O4 LiMn
2o
4at least one, described conductive agent includes at least one in carbon black, carbon nano-tube, acetylene black, electrically conductive graphite and Graphene, described binding agent is Kynoar PVDF, described solvent is N, N dimethyl pyrrolidone NMP.
4. lithium ion battery as claimed in claim 3, is characterized in that, described positive active material is cobalt acid lithium LiCoO
2, described cobalt acid lithium LiCoO
2, the weight ratio between conductive agent and Kynoar PVDF is 94:3:3.
5. lithium ion battery as claimed in claim 1, it is characterized in that, long face (11) surface-coated of described negative current collector (1) has one deck organic system cathode size, and short face (12) surface-coated of described negative current collector (1) has one deck aqueous solvent cathode size.
6. the lithium ion battery as described in claim 1 or 5, it is characterized in that, the negative electrode active material that described organic system cathode size comprises is Delanium, the binding agent that described organic system cathode size comprises is Kynoar PVDF, the solvent that described organic system cathode size comprises is N, N dimethyl pyrrolidone NMP, and the weight ratio between described Delanium, conductive agent and Kynoar PVDF is 94:3:3.
7. the lithium ion battery as described in claim 1 or 5, it is characterized in that, the negative electrode active material that described aqueous solvent cathode size comprises is native graphite, the binding agent that described aqueous solvent cathode size comprises is styrene butadiene rubber sbr, and the solvent that described aqueous solvent cathode size comprises is water;
In described aqueous solvent cathode size, also include sanlose CMC;
Weight ratio between described native graphite, conductive agent, sanlose CMC and styrene butadiene rubber sbr is: 94:3:1:2.
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| CN102810668B (en) * | 2012-08-14 | 2015-04-22 | 安徽亚兰德新能源材料股份有限公司 | Lithium ion battery nickel-cobalt-manganese ternary composite anode material and method for preparing precursor thereof |
| CN103066320A (en) * | 2012-12-27 | 2013-04-24 | 天津力神电池股份有限公司 | Polymer battery and preparation method thereof |
| CN103208645B (en) * | 2012-12-31 | 2015-04-08 | 深圳宏泰电池科技有限公司 | Nano-power battery composed of lithium manganate and graphene and preparation method thereof |
| JP6305961B2 (en) * | 2015-08-04 | 2018-04-04 | オートモーティブエナジーサプライ株式会社 | Lithium ion secondary battery |
| CN109075315B (en) * | 2016-03-30 | 2022-02-01 | 远景Aesc日本有限公司 | Electrode, method for producing same, and secondary battery |
| CN107346832A (en) * | 2017-05-17 | 2017-11-14 | 中国第汽车股份有限公司 | A kind of lithium battery material system |
| CN107546368A (en) * | 2017-09-05 | 2018-01-05 | 沈阳理工大学 | Nickle cobalt lithium manganate ternary based lithium-ion battery positive plate preparation method |
| CN107425195A (en) * | 2017-09-05 | 2017-12-01 | 辽宁来复恒量新能源科技有限公司 | A kind of nickle cobalt lithium manganate ternary based lithium-ion battery positive plate preparation method |
| CN114551796B (en) * | 2022-03-02 | 2024-04-02 | 蜂巢能源科技股份有限公司 | Negative electrode sheet, preparation method thereof and lithium battery |
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| CN101165829A (en) * | 2006-10-20 | 2008-04-23 | 富士重工业株式会社 | Lithium-ion capacitor |
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| CN101165829A (en) * | 2006-10-20 | 2008-04-23 | 富士重工业株式会社 | Lithium-ion capacitor |
| CN101373850A (en) * | 2007-08-21 | 2009-02-25 | 日立麦克赛尔株式会社 | Non-aqueous secondary battery |
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