Lithium battery and manufacturing method thereof
A lithium battery and lithium salt technology, applied in the field of lithium battery and its production, can solve the problems of shortening the battery cycle life, unable to protect the electrode, and the collapse of the positive electrode of the battery, so as to avoid uneven distribution of local current density, good cycle performance, transmission uniform effect
Pending Publication Date: 2021-11-26
BYD CO LTD
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The invention relates to a lithium battery and a manufacturing method thereof. The lithium battery comprises a positive plate, a negative plate, electrolyte and a diaphragm; the electrolyte contains a polymer and a lithium salt, the polymer is polycarbonate and/or polyether; and after at least one charge-discharge cycle, the concentration space gradient of the polymer in the electrolyte is gradually decreased along the direction from the positive electrode to the negative electrode, and the concentration space gradient of the lithium salt is gradually increased along the direction from the positive electrode to the negative electrode. The electrolyte disclosed by the invention contains the polycarbonate and/or polyether polymer and the lithium salt; and along with battery cycle, the concentration space gradient of the polymer is gradually reduced from the positive electrode to the negative electrode, and the concentration space gradient of the lithium salt is gradually increased from the positive electrode to the negative electrode, so that collapse of positive electrode material particles and formation of negative electrode lithium dendrites are avoided, the cycle life of the battery is prolonged.
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