Abstract: The present invention discloses a boron-containing plastic crystal polymer and a preparation method therefor and an application thereof. The described preparation method comprises the following step: curing a mixture containing a plastic crystal, a metal salt, a monomer and a photoinitiator. The plastic crystal polymer prepared by the present invention can be used as all-solid electrolyte, without any liquid additive being added therein. The obtained electrolyte has a room-temperature ionic conductivity up to 3.6×10?4 S/cm, and shows a high sodium ion transference number and a wide electrochemical window up to 4.7V. The present invention further prepares composite positive and negative electrodes for positive and negative electrode modification of a sodium ion battery. A finally assembled all-solid sodium ion battery shows good rate performance and cycle stability at room temperature, achieving a specific discharge capacity up to 104.8 mAh/g at room temperature and a capacity retention ratio of 85.

Abstract: The present invention discloses a boron-containing plastic crystal polymer and a preparation method therefor and an application thereof. The described preparation method comprises the following step: curing a mixture containing a plastic crystal, a metal salt, a monomer and a photoinitiator. The plastic crystal polymer prepared by the present invention can be used as all-solid electrolyte, without any liquid additive being added therein. The obtained electrolyte has a room-temperature ionic conductivity up to 3.6×10?4 S/cm, and shows a high sodium ion transference number and a wide electrochemical window up to 4.7V. The present invention further prepares composite positive and negative electrodes for positive and negative electrode modification of a sodium ion battery. A finally assembled all-solid sodium ion battery shows good rate performance and cycle stability at room temperature, achieving a specific discharge capacity up to 104.8 mAh/g at room temperature and a capacity retention ratio of 85.

Abstract: A carbon fiber composite material comprises a plurality of carbon fiber layers, each layer having a first set of carbon fibers aligned substantially parallel to the long axis of the fibers; and a resin covering at least a portion of the carbon fiber layers. The carbon fiber layers are stacked and laminated together; and at least two layers are disposed so that the first set fibers in the two layers have a relative angle of about 5-90° with each other.