Battery negative electrode material, negative electrode material slurry, negative electrode sheet and electrochemical battery
A battery negative electrode and negative electrode sheet technology, which is applied in the field of electrochemical batteries, can solve problems such as reducing energy density, achieve the effects of improving rate performance, good compactness and specific capacity, and increasing battery capacity
Active Publication Date: 2021-03-12
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
However, the rate performance and energy density are generally contradictory, and these methods will reduce the energy density while improving the battery rate performance.
Method used
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[0054] (101) Provide positive electrode active materials (LiNi 0.6 co 0.2 mn 0.2 o 2 ), binder (polyvinylidene fluoride, PVDF), conductive agent 1 (SP), conductive agent 2 (carbon nanotubes), the contents of which are respectively 96%, 1.3%, 2%, and 0.7% of the total solid mass;
[0055] (102) adding the substances in step (101) into the solvent N-methylpyrrolidone, mixing and stirring to make a positive electrode material slurry with a solid content of 60%;
[0056] (103) Coating the positive electrode material slurry obtained in (102) on an aluminum foil current collector (thickness 16 μm) to make a positive electrode sheet.
[0057] (201) Provide negative active material graphite, binder (styrene-butadiene rubber, SBR), conductive agent 1 (SP), conductive agent 2 (carbon nanotubes), thickener (sodium carboxymethylcellulose, CMC), Niobium Titanium Oxide TiNb 2 o 7 , whose contents are respectively 89.1%, 2.8%, 1.3%, 0.7%, 1.1%, 5% of the total solid mass;
[0058] (20...
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Abstract
The invention discloses a battery anode material. The battery anode material comprises an anode active material, a conductive agent, a binder and niobium titanium oxide, wherein the anode active material is graphite and / or a graphite-like structure carbon, and the mass percent of the niobium titanium oxide n the battery anode material is 1-10%. The present invention further discloses anode material slurry. The anode material slurry comprises the battery anode material; and a solvent, wherein the solvent and the battery anode material are mixed to form a slurry mixture. The present invention further discloses an anode pole piece. The anode pole piece comprises an anode current collector and a battery anode material layer located on the anode current collector, the battery anode material layer is a coating layer formed by the battery anode material or a coating layer formed by coating the anode material slurry on the anode current collector and then removing the solvent. The present invention further discloses an electrochemical battery.
Description
technical field [0001] The invention relates to the field of electrochemical batteries, in particular to a battery negative electrode material, a negative electrode material slurry, a negative electrode sheet and an electrochemical battery. Background technique [0002] With the increasing development and application of electrochemical batteries, such as lithium-ion batteries, especially the rapid development of power batteries, higher requirements are put forward for the fast charging performance and rate performance of batteries. The fast charging performance and rate performance of the battery are reflected in the size of the battery capacity under the condition of high current charging. Moreover, with the industry's requirements for thinner and lighter batteries, the energy density of the battery, that is, the amount of energy stored in the unit mass of the battery, has also attracted more and more attention and attention. [0003] The traditional method improves the ra...
Claims
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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525H01M10/42
CPCH01M4/362H01M4/587H01M4/628H01M10/0525H01M10/4235H01M2004/027Y02E60/10
Inventor 吴西燚魏文飞曾梦丝邹十美钟宽李雪云
Owner GREE ELECTRIC APPLIANCES INC