Abstract: A negative electrode plate having a negative electrode material layer. The negative electrode material layer of the negative electrode plate includes a silicon-based particle and a graphite particle. In a silicon-based particle of a diameter larger than 3 ?m, a Si content in a superficial region is lower than a Si content in an inner region. In this way, a surface stress of the negative electrode plate is reduced, thereby improving stability of an interface between a silicon-based particle and an electrolytic solution, and in turn, effectively improving the cycle performance of the electrochemical device and alleviating the problem of expansion and deformation.

Abstract: A negative electrode material includes silicon-based particles and graphite particles. In a case that a Dn50/Dv50 ratio of the graphite particles is A and a Dn50/Dv50 ratio of the silicon-based particles is B, the following conditional expressions (1) to (3) are satisfied: 0.1?A?0.65 (1); 0.3?B?0.85 (2); and B>A (3), where, Dv50 is a particle diameter of particles measured when a cumulative volume fraction in a volume-based distribution reaches 50%, and Dn50 is a particle diameter of particles measured when a cumulative number fraction in a number-based distribution reaches 50%. The present invention further provides a negative electrode plate, a lithium-ion secondary battery or electrochemical device containing the negative electrode plate, and an electronic device containing the lithium-ion secondary battery and/or electrochemical device.

Abstract: A negative electrode material includes a silicon-based material, where for a test cell including an electrode containing the negative electrode material and a counter electrode made of lithium metal, first-cycle efficiency of the test cell is 81% to 86%, and a discharge capacity at an electric potential of the electrode in the test cell being 0.17V accounts for 35% to 65% of a first-cycle discharge capacity of the test cell. A lithiation platform of particles of a silicon-based material is so defined that a lithiation capacity when an electric potential of the silicon-based negative electrode material in a test half cell is 0.17V accounts for 35% to 65% of a first-cycle lithiation capacity of the test half cell, thereby ensuring amorphous characteristics of the silicon-based material, significantly improving cycling performance of the negative electrode material, and reducing a swelling rate of an electrode assembly during cycling.

Abstract: An anode material includes silicon-based particles and graphite particles, wherein the average sphericity degree of the graphite particles is A, the average sphericity degree of the silicon-based particles is B, and A and B meet: 0<B?A?0.3. The anode material has good cycle performance, and the battery prepared with the anode material has better rate performance and lower deformation rate.

Abstract: A negative electrode plate including a negative electrode material layer. The negative electrode material layer of the negative electrode plate includes silicon-based particles and graphite particles, and pores are created inside the silicon-based particles, so that porosity ?1 of the silicon-based particles and a percentage B of silicon in the silicon-based particles satisfy P=0.5?1/(B-?1B), where 0.2?P?1.6, which can effectively alleviate swelling of the silicon-based particles during lithium intercalation, thereby improving cycling performance and reducing swelling and deformation of the electrochemical apparatus.

Abstract: A negative electrode material includes silicon-based particles. The silicon-based particle includes a silicon-containing matrix and a polymer layer, and the polymer layer is located on a surface of at least a part of the silicon-containing matrix and contains carbon nanotubes and a transition metal element. A lithium-ion battery prepared from the negative active material has improved cycle performance, deformation resistance and rate performance and reduced impedance.

Abstract: A negative electrode includes a negative current collector and a negative active material layer. The negative active material layer includes a silicon-based material. A weight ratio R of the silicon-based material to a total weight of the negative active material layer and an absolute strength ? of the negative current collector satisfy the following formula: K=?/(1.4×R+0.1), where K is a relation coefficient, and the relation coefficient is greater than or equal to 4,000 N/m. The electrochemical device can effectively mitigate XY expansion and deformation of the negative active material layer by using the foregoing negative electrode, thereby enhancing cycle performance and safety performance of the electrochemical device.

Abstract: A negative electrode material includes a silicon-based material and a carbon material. Peaks with a shift range of 1255˜1355 cm?1 and 1575˜1600 cm?1 in a Raman spectrum of the carbon material are a D peak and a G peak respectively. Peaks with a shift range of 1255˜1355 cm?1 and 1575˜1600 cm?1 in a Raman spectrum of the silicon-based material are the D peak and the G peak respectively. A scattering peak intensity ratio of D versus G peaks of the carbon material is A, and a scattering peak intensity ratio of D versus G peaks of the silicon-based material is B. 0.15?A?0.9, 0.8?B?2.0, and 0.2<B?A<1.8.

Abstract: A negative electrode includes silicon-based particles and graphite particles, where a quantity of graphite particles present within a vertical distance of about 0 to 6 ?m to respective edges of the silicon-based particles is N, and based on a total quantity of the silicon-based particles, more than about 50% of the silicon-based particles satisfy: 6?N?17. The negative electrode has good cycle performance, and a battery prepared by using the negative electrode has good rate performance and a low deformation rate.