Battery, battery pack and uninterruptable power supply
A battery and water-based electrolyte technology, applied in the field of electrochemical energy storage, can solve the problems of battery cycle performance, impact of charge and discharge capacity, dendrites, etc., to improve electrochemical performance and safety performance, increase cycle life, and reduce dendrites the formation of the effect
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[0053] In another embodiment, the zinc active material includes zinc and a zinc-containing compound, wherein the zinc-containing compound accounts for 0-50% by mass of the negative electrode material. The zinc-containing compound includes at least one of zinc oxide, zinc hydroxide, and zinc salt. Zinc salts include, but are not limited to, zinc sulfate, zinc chloride, zinc acetate, and zinc oxalate. Specifically, the preparation method of the negative electrode comprises the following steps:
[0054] Dispersing zinc and / or zinc-containing compounds and binders in water, stirring evenly to obtain negative electrode slurry; coating the negative electrode slurry on the negative electrode current collector, drying, rolling, and shearing.
[0055] The sheared negative electrode is externalized. Specifically, the negative electrode and the nickel positive electrode are placed in a 2-7mol / L potassium hydroxide solution, charged at a constant voltage of 2.1V and a constant current of...
Embodiment 1-1
[0083] Preparation of positive electrode: Lithium manganate LMO, conductive agent graphite KS15, binder styrene-butadiene rubber (SBR) and sodium carboxymethyl cellulose (CMC) according to the mass ratio LMO:CMC:SBR:graphite=86.5:1:2.5: 10 mixed in water to form a homogeneous cathode slurry. The positive electrode current collector is graphite foil, and the positive electrode slurry is coated on the positive electrode current collector to form an active material layer, which is then pressed into sheets to make a positive electrode sheet. The thickness of the positive electrode sheet is 0.4mm, and the surface density of the positive electrode active material is 750g / m 2 .
[0084] Prepare negative electrode: mix zinc oxide and zinc active material, conductive agent acetylene black, additive bismuth oxide, indium oxide, lead oxide and calcium hydroxide, binder PTFE and HPMC, disperse in deionized water, and stir evenly to obtain negative electrode slurry The negative electrod...
Embodiment 1-2
[0089] In Example 1-2, the steps for preparing the positive electrode are the same as in Example 1-1.
[0090] Prepare negative electrode: mix zinc active material zinc, conductive agent acetylene black, additives indium oxide, lead oxide and calcium hydroxide, binder PTFE and HPMC, disperse in deionized water, stir evenly to obtain negative electrode slurry, and negative electrode slurry Coating on the negative electrode collector punched copper foil with a pore diameter of 0.8 mm and a thickness of 0.2 mm, drying, rolling and shearing to obtain a porous zinc negative electrode sheet. Wherein the weight percent of each component in the negative electrode material is: zinc 89%, acetylene black 2%, bismuth oxide 2%, indium oxide 1%, lead oxide 0.5%, calcium hydroxide 3%, PTFE 2%, HPMC 0.5%. The porous zinc negative electrode sheet has not undergone chemical formation.
[0091] Weigh a certain mass of zinc sulfate and lithium sulfate, add them to dissolve in water, and configur...
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