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A technology of lithium nickel manganese oxide and battery capacity, applied in the field of lithium nickel manganese oxide battery, can solve the problems of multi-active lithium ions, blockage of lithium ion channels, collapse of crystal structure, etc., and achieve the effect of improving battery capacity
Pending Publication Date: 2016-07-27
SUZHOU YOULION BATTERY INC
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[0004] Thermodynamically, there are two main reasons for the reduction of battery capacity: one is the loss of activity of the positive and negative electrode materials, such as the collapse of the crystal structure, the blockage of lithium ion channels, and poor contact between the active material and the conductive agent; the other is the consumption of active lithium ions. , such as used to form SEI film and lithium ions that cannot be completely removed from the positive and negative electrodes
[0005] For example, a high-voltage lithium nickel manganese oxide (LiNi0.5Mn1.5O4) battery is charged and discharged at a high voltage above 4.5V. During charging and discharging, in addition to the formation of an SEI film on the surface of the negative electrode, the electrolyte will also oxidize on the lithium nickel manganese oxide positive electrode. Decompose to form an oxide film that binds the movement of lithium ions; as the electrolyte continues to decompose, the oxide film continues to grow, thereby consuming more active lithium ions, resulting in a rapid decrease in battery capacity
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Embodiment 1
[0024] This embodiment provides a lithium nickel manganese oxide battery, including a battery main body, a negative electrode arranged on the battery main body and made of graphite, a positive electrode sheet arranged on the battery main body and corresponding to the negative electrode, and a battery filled in the battery main body. electrolyte in the
[0025] In terms of mass percentage, the positive electrode sheet contains the following components: 3wt% compound, 5wt% conductive agent, 3wt% binder, and a positive electrode active material composed of lithium nickel manganese oxide that occupies the remaining proportion;
[0027] Correspondingly, lithium titanate, lithium vanadate or lithium peroxide are all the same as lithium iron phosphate, which can realize the extraction of lithium ions at a lower voltage; they can be substituted for each other when needed;
[0033] Example 2 is basically the same as Example 1, the only difference is that the content of the compound is 5wt%.
Embodiment 3
[0035] Embodiment 3 is basically the same as Embodiment 2, the only difference is: the compound content is 8wt%.
[0036] refer to figure 1 , and in conjunction with embodiment 1, embodiment 2, and embodiment 3 and simultaneously add the lithium nickel manganese oxide battery used at the present stage to run at a voltage interval of 3.5 with a charge and discharge rate of C / 3; and obtain the battery used at the present stage, Embodiment 1, embodiment 2, and the specific capacity of its corresponding lithium nickel manganese oxide of embodiment 3;
[0037] At this time, lithium iron phosphate is completely oxidized to iron phosphate and does not participate in the electrochemical reaction, so the battery capacity comes entirely from lithium nickel manganese oxide. At the same time, as the amount of lithium iron phosphate in the positive electrode increases, the specific capacity of lithium nickel manganese oxide It will increase accordingly; lithium nickel manganese oxide is t...
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【Technical field】 [0001] The present invention relates to the technical field of lithium ion batteries. Specifically, it provides a positive electrode sheet for increasing the capacity of a lithium nickel manganese oxide battery, and simultaneously provides a lithium nickel manganese oxide using the positive electrode sheet for improving the capacity of a lithium nickel manganese oxide battery. Battery. 【Background technique】 [0002] Batteries are essential items in daily life, among which lithium-ion batteries are the most widely used. [0003] In the field of lithium-ion battery technology, the process of charging and discharging corresponds to the reciprocating insertion and extraction reaction of lithium ions between the positive and negative electrode materials; the capacity of the battery is directly related to the amount of active lithium ions that can be repeatedly inserted and extracted; [0004] Thermodynamically, there are two main reasons for the reduction of b...
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