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Negative electrode slurry, negative electrode sheet and lithium ion battery including the negative electrode slurry
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A technology of negative electrode slurry and negative electrode active materials, which is applied in the direction of battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of lithium analysis, slow lithium ion conduction rate, and potential safety hazards, and achieve easy large-scale production, improve the phenomenon of lithium analysis, and reduce the effect of lithium analysis
Active Publication Date: 2018-01-02
NINGDE AMPEREX TECH
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Problems solved by technology
However, lithium-ion batteries are often prone to obvious lithium precipitation when they are charged at low temperatures or at high rates.
This will significantly affect the capacity and life of lithium-ion batteries, and there are also potential safety hazards
[0003] It has been found through research that the lithium ion separation phenomenon of lithium-ion batteries mainly occurs at the negative electrode, and the conduction rate of lithium ions is too slow, so that when it is too late to be embedded in the negative electrode active material, it will be deposited on the surface of the negative electrode instead of embedded in the negative electrode active material. Will seriously affect the life and safety performance of lithium-ion batteries
At present, there are many improvement methods for the above-mentioned lithium precipitation phenomenon, such as selecting organic or inorganic materials, coating, doping or mechanically grinding the negative electrode active material, etc. processing, and the process is complicated, the cost is high, and the efficiency is low
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[0047] The preparation method of the negative electrode slurry provided in this application is not particularly limited, it can be prepared according to conventional methods, for example, adding negative electrode active materials, conductive agents, binders, organic additives, and inorganic additives to the solvent for mixing or mixing the negative electrode slurry Active materials, conductive agents, binders, organic additives, inorganic additives, and thickeners are added to the solvent for mixing. In particular, the negative electrode slurry is obtained after uniform mixing.
[0048] In particular, a method comprising the following two steps is selected to prepare the negative electrode slurry.
[0049] Step 1, mixing the negative electrode active material and the organic additive.
[0050] In the above step 1, the negative electrode active material and the organic additive are the negative electrode active material and the organic additive mentioned above. In order to fu...
[0077] Negative electrode slurry 1 # ~24 # were prepared according to the following methods:
[0078] Negative electrode active materials, conductive agents, binders, thickeners, organic additives, and inorganic additives are added to water, and after uniform mixing, negative electrode slurry is obtained.
[0079] In the foregoing examples, the types and amounts of organic additives and inorganic additives used in the preparation of each negative electrode slurry, as well as the amounts of binders, conductive agents, and thickeners are shown in Table 1 below, wherein the organic additives , inorganic additives, binders, conductive agents and thickeners are used in percentages by weight calculated based on the total weight of the negative electrode active material layer.
[0080] Table 1
[0081]
[0082]
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Abstract
The invention relates to a cathodesizing agent and a cathode piece and a lithiumion battery containing the cathodesizing agent. The cathode sizing agent comprises a cathode active material, adhesion agents, conductive agents, inorganic additives and organic additives, wherein the inorganic additives are selected from one or more of inorganic metaloxide and inorganic lithium salt; the organic additives are at least of one of compounds formed after aromatic hydrocarbon with the carbon atom number being 6-30 is replaced with groups R and groups N and compounds formed after aromatic hydrocarbon with the carbon atom number being 6-30 is replaced with groups R and groups Ny, the groups R are groups of atoms with lone pairelectron pairs, and the groups N and the groups Ny are both groups containing hydrogen atoms. After the cathode sizing agent is applied to the lithiumion battery, the circulating performance and the multiplying-power charging performance of the lithium ion battery are not affected, the lithium precipitation phenomenon of the lithium ion battery is effectively improved, the preparation technology is simple, cost is low, and large-scale production is easy.
Description
technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular, to a negative electrodeslurry, a negative electrode sheet including the negative electrodeslurry, and a lithium-ion battery. Background technique [0002] With the development of society, people's awareness of environmental protection is getting stronger and stronger. As a clean energy, lithium-ion batteries have been widely used in consumerelectronics, power batteries, and energy storage. However, lithium-ion batteries are often prone to obvious lithium precipitation when they are charged at a low temperature or at a high rate. This will significantly affect the capacity, life and other properties of lithium-ion batteries, and there are also potential safety hazards. [0003] It has been found through research that the lithium-ion separation phenomenon of lithium-ion batteries mainly occurs at the negative electrode, and the conduction rate of lithium ...
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