402030 polymer battery company

Polymer lithium-ion battery technology 2.1 Performance characteristics of polymer lithium-ion batteries Polymer lithium-ion batteries refer to lithium-ion batteries that use solid polymer electrolytes (SpE) as electrolytes. The battery is formed by pressing the positive electrode current collector, the positive electrode film, the polymer electrolyte film, the negative electrode film, and the negative electrode current collector, and then wrapping the aluminum-plastic composite film, and sealing its edges with heat fusion to obtain a polymer lithium-ion battery. Since the electrolyte membrane is solid, there is no leakage problem, and the degree of freedom in battery design is large, and it can be connected in series or parallel or adopt a bipolar structure according to needs. Polymer lithium-ion batteries have the following characteristics: ①flexibility in shaping; ②higher mass specific energy (3 times that of MH-Ni batteries); ③wide electrochemical stability window, up to 5V; ④perfect safety and reliability; ⑤Longer cycle life, less capacity loss; ⑥High volume utilization; ⑦Wide application fields. Its working performance indicators are as follows: working voltage: 3.8V; specific energy: 130Wh/kg, 246Wh/L; cycle life: >300; self-discharge: <0.1%/month; working temperature: 253-328K; 80% capacity; 3h to 100% capacity; environmental factors: non-toxic. 2.2 Cathode material The characteristics and price of a lithium-ion battery are closely related to its cathode material. Generally speaking, the cathode material should meet: (1) Electrochemical compatibility with the electrolyte solution within the required charge and discharge potential range; (2) Mild electrode process kinetics; (3) Highly reversible; (4) Good stability in air in the state of full lithium. With the development of lithium-ion batteries, research on high-performance, low-cost cathode materials is ongoing. At present, research mainly focuses on lithium transition metal oxides such as lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide [1] (see Table 1). Table 1 Comparison of three main cathode materials for lithium-ion batteries