CN101009371A - A method for making the anode of the pole lithium-FeS2 battery - Google Patents

Abstract

The invention relates to a method for making positive plate of high energy column lithium battery that the iron disulfide is the positive pole active matter. It includes steps as following: (1) iron disulfide, acetylene black and graphite are mixed according to iron disulfide: acetylene black: graphite= (40-95):(20-50):(20-50), then it is ball grinded for 2-6 hours, then baked for 20 hours at temperature of 100DEG C-300DEG C;(2) The PVDF (polyvinylidene fluoride) is dissolved in NMP(N-methyl alkyl ketone), agitating for 1-32 hours to become uniform glue solution; Then the dry powder produced in step 1 is added into the glue solution, the proportion is: dry powder: PVDF: NMP(50-80): (1-3):(30-70); The mixture is agitated to uniform viscous slurry. (3) the slurry is coated to the aluminum foil by draw slurry machine, it is baked for 20 hours at temperature of 100DEG C-300DEG C, then it is rolled to definite thickness by roll squeezer, the electrode is welded and the piece is lead out. The invention provides a method for making positive plate of column coiled lithium iron disulfide battery that low cost, simple manufacturing technique, perfect electrical property, high capacity.

Description

The anodal manufacture method of a kind of pole lithium-FeS 2 battery

Affiliated technical field

The present invention relates to the battery technology field, especially a kind of is the manufacture method of positive plate of the high-energy column type lithium cell of positive active material with the ferrous disulfide.

Background technology

Along with the development of society, the progress of science and technology, people's environmental protection consciousness is more and more stronger, and therefore, this environmental protection battery of lithium battery arises at the historic moment.China also from last century the eighties realized the production of lithium manganese, lithium Asia, lithium ion battery successively.

Chen Dawei " understanding of lithium manganese dioxide cell discharge mechanism " (" battery " 1985 the 4th, 5 phases) has introduced the operation principle of lithium-manganese cell.

Feng Chuanqi etc. have introduced the operation principle of Li/CL3 battery in " research of lithium battery Li/CL3 system " (" battery " 1993 the 3rd phases).

Ma Yongjing has introduced the discharge principle of the inferior battery of lithium in " Li/SOC12 cell voltage hysteresis problem " (" battery " 1994 the 4th phases).

Wang Li " pre-test of lithium ion battery negative material moulding process " (" battery " 1998 the 2nd phases) that be stuck in introduced the negative pole manufacture method of lithium ion battery.

The characteristics of lithium-manganese cell are, single cell voltage height (3V), and self-discharge rate is low, serviceability temperature scope wide (20 ℃～+ 60 ℃), discharging voltage balance, security performance is good, and natural discharge rate is low.Be mainly used on digital camera, the light fixture.

The characteristics of lithium-thionyl chloride battery are rated voltage 3.6V, the monomer voltage height; Be a kind of battery that specific energy is the highest in the battery in the actual use (500wh/Kg, 1000wh/L); During the discharge of normal temperature medium current density, discharge curve is extremely smooth.Workbench remains unchanged in 90% the range of capacity; Battery can be worked in-40 ℃～+ 75 ℃ scopes.Year self-discharge rate≤1%; Storage life is more than 10 years.Be mainly used on intellectual water meter, gas meter, the ammeter.

The characteristics of lithium ion battery are the energy density height, and the energy bulk density can reach 370Wh/L, and the energy weight density can reach 150Wh/Kg.The voltage height, average voltage is 3.7V, is about NI-G, Ni-MH battery 3 times, the rate that discharges and recharges is little.The memory effect that does not have NI-G, Ni-MH battery.Security performance is good, and the scope of application is big, is mainly used in mobile phone, notebook computer etc.

Though above-mentioned battery has many advantages, but because the required voltage of a lot of electrical appliances on the domestic market is 1.5V, so we are badly in need of the alkaline Mn cell that a kind of environment-friendly battery substitutes present high pollution, the rated voltage of battery of lithium-iron disulphide is 1.5V, be characterized in capacity height (can reach more than the 2900mAh), absolute capacity is 2 times of alkaline Mn cell.When being used for digital camera and taking pictures, can clap more than 600 the 8-10 of alkaline Mn cell (be doubly); Self discharge is low, and storge quality is good, and the resting period can reach 5-10; In light weight, 2/3 of alkaline Mn cell; Poisonous and harmful substance such as not mercurous, real environmental protection; Discharge platform is stable, and security performance is good; The serviceability temperature scope is wide, can use in-40 ℃～+ 80 ℃ temperature ranges.Be mainly used on digital camera, the mp3.

Column type coiling lithium one FeS 2 battery, its structure is made up of battery case, electrode, barrier film, electrolyte, encapsulant; The utmost point group inside of its battery is three layers, and one deck is a positive plate, and one deck is a negative plate, and the intermediate layer is a barrier film; This utmost point group is inserted in the box hat of nickel plating, the negative lug of utmost point group contacts with the battery case bottom, and positive plate can contact with battery cover by positive pole ear; Between loam cake and housing, be inserted in the sealing ring of the macromolecular material of insulation, seal the back and form cell.

We study in the making of araeosystyle battery of lithium-iron disulphide, and the present invention is at the manufacture method of pole lithium-FeS 2 battery anode pole piece and propose.

Summary of the invention

The technical solution adopted for the present invention to solve the technical problems is: the anodal manufacture method of a kind of pole lithium-FeS 2 battery is characterized in that: may further comprise the steps:

(1) treated ferrous disulfide, acetylene black and graphite are pressed ferrous disulfide: acetylene black: graphite=(40～95): (20～50): the weight proportion of (20～50) mixes, ball milling 2～6 hours toasted 10～30 hours with 100 ℃～300 ℃ temperature then in a vacuum;

(2) Kynoar (PVDF) is pressed against alkane ketone (NMP) dissolving with N-methyl arsenic, stirred 1～32 hour, become uniform glue; The dry powder that step 1 is made is added in the glue then, and ratio is:

Dry powder: PVDF: NMP=(50～80): (1～3): (30～70);

Mixture is stirred into the slurry of even thickness.

(3) utilize tensile pulp machine that slurry is coated on the aluminium foil, 100 ℃～300 ℃ temperature vacuum bakeout 10～30 hours, the roll squeezer top roll is pressed onto suitable thickness, the electrode lead-out tablet of burn-oning.

As optimization, step (3) pasting on the bigger aluminium foil of a slice earlier, vacuumize and roll-in cut into aluminium foil the small pieces of corresponding specification again.

The present invention adopts ferrous disulfide as positive electrode active materials, and a kind of manufacture method of with low cost, production technology is simple, electrical property is good, capacity is high column type coiling lithium one ferrous disulfide battery anode sheet is provided.

Description of drawings

Fig. 1 is the positive plate front view.

Fig. 2 is the positive plate cutaway view.

Fig. 3 is the AA type battery discharge curve chart that adopts the positive plate of the present invention's making.

Fig. 4 is the discharge curve of AA type battery storage after 1 year that adopts the positive plate of the present invention's making.

Embodiment

The present invention is further described below in conjunction with drawings and Examples.

The anodal manufacture method of a kind of pole lithium-FeS 2 battery is characterized in that: may further comprise the steps:

(1) treated ferrous disulfide, acetylene black and graphite are pressed ferrous disulfide: acetylene black: graphite=(40～95): (20～50): the weight proportion of (20～50) mixes, ball milling 2～6 hours toasted 20 hours with 100 ℃～300 ℃ temperature then in a vacuum;

(2) Kynoar (PVDF) is pressed against alkane ketone (NMP) dissolving with N-methyl arsenic, stirred 1～32 hour, become uniform glue; The dry powder that step 1 is made is added in the glue then, and ratio is:

Dry powder: PVDF: NMP=(50～80): (1～3): (30～70);

Mixture is stirred into the slurry of even thickness.

(3) consult Fig. 1 and Fig. 2, utilize tensile pulp machine that slurry 1 is coated on the aluminium foil 2, first trial-production 3-4 sheet is measured the surface density of pole piece, produces continuously after qualified again; Remove the empty paper tinsel on aluminium foil 2 both sides afterwards, the sheet that cuts is put into vacuum oven, and with 200 ℃ temperature bakings 20 hours, it is thick that the roll squeezer top roll is pressed onto 0.2mm, again aluminium foil 2 is cut into the small pieces of corresponding specification, burn-on aluminium nickel composite band as electrode lead-out tablet 3 with supersonic welder again.

As use the AA type lithium battery that positive plate that flow process makes makes and carry out discharge test, with the 200mA constant-current discharge to 1.0v.Discharge curve as shown in Figure 3, its discharge platform is more than 1.42v, capacity is more than 3000mAh.

As use AA type lithium battery that positive plate that flow process makes makes and store after 1 year and carry out discharge test, with the 200mA constant-current discharge to 1.0v.Discharge curve as shown in Figure 4, its discharge platform is more than 1.41v, capacity is about 3000mAh; Self-discharge rate is less than 1%/year.

Above-described specific embodiment only is preferred embodiment of the present invention, and the equivalent arrangements of being done according to the present patent application claim all should be technology of the present invention and contains such as.

Claims (2)

1. the anodal manufacture method of a pole lithium-FeS 2 battery is characterized in that: may further comprise the steps:

(1) treated ferrous disulfide, acetylene black and graphite are pressed ferrous disulfide: acetylene black: graphite=(40～95): (20～50): the weight proportion of (20～50) mixes, ball milling 2～6 hours toasted 10～30 hours with 100 ℃～300 ℃ temperature then in a vacuum;

(2) Kynoar (PVDF) is pressed against alkane ketone (NMP) dissolving with N-methyl arsenic, stirred 1～32 hour, become uniform glue; The dry powder that step 1 is made is added in the glue then, and ratio is:

Dry powder: PVDF: NMP=(50～80): (1～3): (30～70);

Mixture is stirred into the slurry of even thickness.

(3) utilize tensile pulp machine that slurry is coated on the aluminium foil, 100 ℃～300 ℃ temperature vacuum bakeout 10～30 hours, the roll squeezer top roll is pressed onto suitable thickness, the electrode lead-out tablet of burn-oning.

2. the anodal manufacture method of a kind of pole lithium-FeS 2 battery according to claim 1 is characterized in that: step (3) pasting on the bigger aluminium foil of a slice earlier, vacuumize and roll-in cut into aluminium foil the small pieces of corresponding specification again.

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