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1.1 The failure of recycling cathode alloy powder

Will be invalid MH / Ni battery shells peel, carve selected from the battery laptop battery cell cathode film, using ultrasonic vibration and other physical methods, the failure cathode powder, and then chemically treated to be treated cathode powder, this negative pressure powder films, in the non-consumable vacuum arc furnace melting repeated 3 to 4 times. To remove the surface oxide layer ingot melting, be broken, after mixing, measured by ICP method of mixed rare earth, nickel, cobalt, manganese, aluminum percentage content of each element, according to the loss of hydrogen storage alloy elements is different from the nickel element content as a benchmark, complementing other essential elements, further refining the ultimate recovery of alloys have excellent performance.

1.2 Failure MH / Ni battery negative electrode alloy recovery

Will be invalid negative powder using chemical treatment methods, the use of treatment fluid on the alloy surface erosion, destruction of alloy surface oxides, but did not make ThinkPad A20M the oxidation of other alloy elements and the conductive agent of erosion by the impact to a minimum. With 0 5mol? L-1 of acetic acid solution, will expire alloy powder at room temperature handling 0.5h, then distilled water washing, drying under vacuum. The results shows, AB5-type hydrogen storage alloys of the main structure has not changed, still a CaCu5-type hexagonal structure, but the cathode powder Al (OH) 3 and La (OH) 3 of the impurities completely disappear, indicating the oxide by chemical after treatment, the surface oxide is almost completely dissolved away. After chemical treatment failure and making the battery anode powder used in the original alloy powder and without chemical treatment failure alloy powder, do charge and discharge performance comparison, after chemical treatment of the failure of the discharge capacity of cathode powder without chemical treatment failure than ThinkPad A21M Cathode powder high 23mAh? g-1, shows that, after chemical treatment, because of the surface oxide was largely removed, so that failure in the negative hydrogen storage alloy powder to increase the active ingredients. XPS results show that the cathode powder concentration of the surface nickel atoms by the chemical treatment before the 6.79% increase to 9.30%, which shows that, after chemical treatment after the formation of a surface alloy with higher electro-catalytic activity of nickel-rich layer, which not only improved hydrogen storage electrode of the electro-catalytic activity, but also provides a means of spread of the hydrogen atom, thereby electrode discharge performance. However, after chemical treatment failure battery anode powder and production compared to the original alloy powder, discharge capacity is still less than 90mAh? G-1, on the one hand may be due to oxidation of the alloy is not just confined to the surface, there could be deep into the alloys within the chemical treatment is to simply remove the surface oxides, particles deep within the oxide has not been completely removed; the other hand, may be due to the alloy powder so that the specific surface area increased, while alloy and O2 response and by the electrolyte corrosion easier, for two reasons together lead to alloy discharge performance degradation. So, just by chemical treatment method ThinkPad R60 does not allow negative failure recovery, still needs to melt processing.

After the chemical treatment of the above cathode powder, non-consumable arc furnace smelting carried out for the first time. Obtained for alloy ingots polishing, to remove surface impurities, the analysis of element content, the result can be seen that the alloy element contents deviate from the original alloy, nickel content is much larger than the original alloy powder of the nickel content, it is because the production of electrodes the process of adding nickel powder to do conductive agent, in order to effectively use it to it as a benchmark to adjust the content of other elements to meet the composition of the various elements of MmNi3.5Co0.7Mn0.4Al0.3 ratio, a second smelting. After smelting, the alloy ingots will be crushing, grinding, the test structure, in order to CaCu5 type, there are no other impurities generated.

The recovered alloy ThinkPad T60 powder to do charge-discharge performance test, we can see that the discharge capacity of alloy powder recovery than the failure of high cathode powder is about 100mAh? G-1, with the original alloy powder is basically the same compared to the discharge capacity, and the recovery of alloy powder discharge plateau pressure than the original alloy powder platform for high-pressure discharge of about 20mV or so, this may be due to alloy the process of recovery after several rounds of melting, the alloy composition and microstructure of the reason has been improved.

2. Scrap lithium-ion rechargeable battery

Alkali-soluble acid leaching → P204 → purification → P507 extraction extraction of cobalt and lithium sulphate → back-extraction recovery of cobalt and lithium carbonate recycling raffinate liquid deposition of the process, from the spent lithium-ion secondary battery in the recovery of cobalt and lithium. The results show that: alkali-soluble can be removed in advance about 90% of aluminum, H2SO4 + H2O2 system, the recovery rate of leaching of cobalt up to 99% or more; P204 purified extraction, impurity content Al3.5mg / L, Fe0.5mg / L, Zn0 .6 mg / L, Mn2.3mg / L, Ca <0.1mg / L; with the P507 extraction of cobalt and lithium, at pH 5.5, the separation factor βCo / Li can be as high as 1 × 105; 95 ℃ above saturated sodium carbonate deposition of lithium carbonate, lithium 40Y6797 carbonate derived from up to zero-product requirements, a Shen Li-rate was 76.5%.

Lithium-ion secondary battery from the shell and internal batteries composed of the outer shell of stainless steel, nickel-plated steel or plastic shell; the battery's internal batteries for the roll-type structure, mainly by the positive, negative, isolation membrane, electrolysis fluid composition. General battery cathode material by about 90% of lithium cobalt oxide active material, 7% ~ 8% of acetylene black conductive agent and 3% to 4% organic binder, a mixture evenly coated in the thickness of about 20μm aluminum foil on the current collector; battery The negative from about 90% of the negative electrode active material carbon materials, 4% ~ 5% acetylene black conductive agent and 6% to 7% binder mixture evenly coated in a thickness of 15μm copper foil on the current collector. Positive and negative thickness of about 0.18 ~ 0.20mm, the middle separation membrane with thickness of about 10μm separated by isolating film tends to be used polyethylene or polypropylene film, the electrolyte for lithium hexafluorophosphate solution of the organic carbonate. Will be spent lithium-ion secondary 40Y6799 battery packaging and remove the shell, remove the batteries, cathode material was isolated.