NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, NEGATIVE ELECTRODE MATERIAL, AND MAKING METHOD
First Claim
1. A negative electrode material for non-aqueous electrolyte secondary batteries, comprising an active material and 1 to 20% by weight of a binder, wherein said active material comprises silicon oxide particles and silicon particles, and the silicon particles are present in an amount of not more than 50% by weight based on the active material.
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Abstract
A negative electrode material comprising an active material and 1-20 wt % of a polyimide resin binder is suitable for use in non-aqueous electrolyte secondary batteries. The active material comprises silicon oxide particles and 1-50 wt % of silicon particles. The negative electrode exhibits improved cycle performance while maintaining the high battery capacity and low volume expansion of silicon oxide. The non-aqueous electrolyte secondary battery has a high initial efficiency and maintains improved performance and efficiency over repeated charge/discharge cycles by virtue of mitigated volumetric changes during charge/discharge cycles.
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Citations
19 Claims
- 1. A negative electrode material for non-aqueous electrolyte secondary batteries, comprising an active material and 1 to 20% by weight of a binder, wherein said active material comprises silicon oxide particles and silicon particles, and the silicon particles are present in an amount of not more than 50% by weight based on the active material.
Specification